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Exam Number : P2170-016
Exam Name : IBM IOC Intelligent Transportation Technical Mastery Test v1
Vendor Name : IBM
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Key Takeaway facets and training discovered from QCon London 2008 | P2170-016 PDF Questions and exam Cram

listed here, we latest the views and views of lots of the attendees who blogged about QCon, so that you should get a feeling what the impressions and experiences of QCon London (March 2008) have been. From the first tutorials to the ultimate classes, people mentioned many elements of QCon of their blogs. which you could also see a large number of attendee-taken pictures of QCon on Flickr.

This QCon changed into InfoQ's third convention and the second annual in London. The adventure become produced in partnership with Trifork, the company who produces the JAOO conference in Denmark. there were over 600 badges printed, with 70% of the attendees being  group lead, architect and above. 60% have been attending from the united kingdom and forty% from in most cases round Europe. Over 100 speakers introduced at QCon London including Kent Beck, Martin Fowler, and Erich Gamma.  Going ahead, QCon will continue to run in the UK around March of every year, and QCon San Fracisco (see previous blogger feedback) will be working November 17-twenty first 2008.

table of Contents

Tutorials   * Patterns for Introducing Agile Practices   * area-specific Languages   * Coding the structure: From Developer To Architect   * The Zen of Agile management   * construct Scalable, Maintainable, distributed business .net solutions with nServiceBus

Keynotes   * Erich Gamma: How Eclipse changed my Views on utility construction   * Martin Fowler and Jim Webber: Does my Bus seem big in this?   * Kent Beck: trends in Agile construction

BOFs   * JCP   * InfoQ

SOA, leisure and the web   * rest: a practical Introduction to the net's structure   * the usage of rest to aid WS-* - constructing a RESTful SOA Registry   * leisure, Reuse, and Serendipity   * Diary of a Fence Sitting SOA Geek   * a couple of the right way to epidermis an internet-Scale Cat

The Cloud because the New Middleware Platform   * Amazon services: building Blocks for genuine cyber web functions   * utility features on the internet: SalesForce.com   * Google GData: analyzing and writing facts on the web   * Yahoo Pipes: Middleware within the Cloud   * Panel: Programming the Cloud

Banking: complicated excessive extent/Low Latency Architectures   * know-how within the funding Banking house   * retaining ninety nine.ninety five% Uptime on 400+ Key systems at Merrill   * precise-time Java for Latency vital Banking purposes   * From making a bet to Gaming to Tradefair   * LiquidityHub

Programming Languages of the next day   * The Busy .net Developer's guide to F#   * Haskell: purposeful Programming on Steroids   * services + Messages + Concurrency = Erlang   * The Busy Java Developer's e-book to Scala   * Open area session

Evolving Java   * Concurrency, previous and present   * blending Java with Dynamic Languages   * Evolving the JVM   * The Cathedral, the Bazaar and the Commissar: The Evolution of Innovation in commercial enterprise Java   * Evolving the Java Language

solution song   * Architectural Implications of RESTful design   * Introducing Spring Batch   * Panel: Open source and Open requisites   * Panel Discussions: Architecting for performance and Scalability   * Clustered structure Patterns: providing Scalability and Availability   * checking out by example with Spring 2.5

Browser & rising wealthy customer technologies   * GWT + Gears: The Browser is the Platform   * The DOM Scripting Toolkit: jQuery   * Tackling Code Debt

Agile in practice   * Managers in Scrum   * Agile Mashups   * beyond Agile   * A Kanban equipment for utility Engineering

XpDay Sampler   * Measure for Measure

.web: client, Server, Cloud   * building sensible windows applications   * building prosperous information superhighway purposes   * home windows as a web Platform

the rise of Ruby   * Panel: When is Rails an appropriate choice?

advantageous Design   * Intentions & Interfaces - Making Patterns Concrete   * A tale of Two methods   * person Interfaces: meeting the challenge of Simplicity   * beneficial Design

Architectures you have got at all times wondered About   * eBay's Architectural principles   * architecture in the Media construction Workflow   * behind the Scenes at MySpace.com   * Market chance equipment @ BNP Paribas

area particular Languages in apply   * external Textual DSLs Made primary

Interviews

Social events

Opinions about QCon itself

Takeaway aspects

Video

Podcast

Conclusion

Patterns for Introducing Agile Practices linked subsidized content

Michael hunger linked his innovations on this tutorial:

On Monday i was delighted to attend Lindas tutorial. It had a very very own contact, changed into very interactive. She presented the patterns for introducing new ideas into organizations the usage of a play with us participants as actors. in reality this became the story of herself introducing Design Patterns again in 1996. all over the discussion many of the subtleties of the patterns (i.e context and forces) have been addressed. Having us contributing by means of enjoying and asking lots of questions helped an awful lot to truly soak up the essence of the patterns. It became lots of enjoyable.[...]Linda is a fine speaker with deep knowing and loads of wisdom to share. Thanks an awful lot for the educational.

domain-selected Languages

Leonardo Borges gave a detailed summary of this tutorial, including:

Marting Fowler all started discussing what DSL's are and giving some examples that many of us use in our daily Job. like the XML configuration info within the Java world. it's a form of DSL, it has it be own keyword phrases and syntax as a way to specific some suggestions that might be used , as an instance, to configure an underlying framework.

The problem with XML is that it turns into difficult to peer the overall habits at the back of it. it be now not very fluent to bear in mind the aim of an XML file just by means of looking at it for the first time. There is too lots "noise". issues that get into the way of the readability. -

YAML files are an a lot extra readable options to XML.

Ola Bini additionally attended this tutorial and shared his techniques:

I've seen bits and components of this tutorial before, however seeing because the three audio system are engaged on evolving it to a full and coherent "pedagogical framework" for educating DSLs, the current presentation had modified reasonably slightly because the final time. I definitely liked it and i suggest it to any one attracted to getting a firm grasp about what DSLs are. Having Rebecca discuss external DSLs in the context of parsers and grammars makes total sense, and the handiest precise component i'd say was a problem became the time disbursed to it. Her part of the area was huge ample that 75 minutes felt slightly rushed. Of course, I do not see how Martins or Neals materials may be compressed plenty more both, so perhaps the field really is simply too massive for a someday tutorial? Anyway, first-rate stuff.

Mark Edgington wrote about this tutorial as smartly:

My take out changed into that using DSL's must get extra prominence, in a similar method to Agile development; which has taken years to benefit main stream prominence. through the use of DSL's builders will gain talents and solve complications in a greater stylish style, so it's a particular win and with a Martin Fowler e-book on the field it's going to get wider prominence.

Cleve Gibbon also had several take-away elements, including:

  • there's lots of unknowns surrounding the total enviornment of DSLs, and what Fowler and Co are doing are exploring the issue area and proposing alternate options.
  • Some languages, Ruby, Groovy, Scala lend themselves greater readily to writing readable inside DSLs
  • there were loads of Ruby guys in the room, including the leads on rSpec, an inner DSL for Ruby checking out
  • The definition for DSLs is extensive open for interpretation and much more will happen in the space over the coming months
  • I should do some more practicing around the concept of a language workbenches. Very pleasing stuff.
  • Jay Fields was inspired to write down an article about DSL Simplexity:

    At

    QCon London I caught the domain specific Language (DSL) tutorial via Martin Fowler, Neal Ford, and Rebecca Parsons. whereas Martin covered how and why you can want to create a DSL he mentioned hiding complexity and designing solutions for specific complications. As Martin went into additional element all I might think become: Simplexity.

    Anders prefers fundamental all the way down. Of course, with a bit of luck we all prefer simplicity; besides the fact that children, the satan often lives within the particulars.

    Coding the architecture: From Developer To Architect

    Simon Brown posted a document used all the way through this tutorial on his blog:

    throughout our

    tutorial last week at QCon, we requested attendees to outline the software architecture for a small utility device and offered a handout containing some guidelines. given that this may additionally show useful for different americans, we're making software structure document guidelines v0.1 available for down load.

    This document became additionally written about on InfoQ.

    The Zen of Agile management

    Mark Edgington attended this tutorial:

    David Anderson came at agile pretty much from the standpoint of general issue software projects. He checked out how these could be edged towards the agile world via clear identification of the cost flow (manner) and the examination of metrics around this. His key take outs that fine should still be the focus and cutting back the work in progress (WIP) leads to efficiency: in effect shorter cycles or sprints work a long way better than huge batches of work. Having focused on agile methodologies, this standpoint of the way to get to agile inspired loads of idea; it is regularly the case that a covert agile method must be followed, the place a full and open system reminiscent of Scrum, cannot be taken.

    build Scalable, Maintainable, distributed enterprise .net options with nServiceBus

    Udi Dahan had some strategies on his tutorial:

    I gave a full day tutorial on

    nServiceBus and we had a full condominium! the educational became about 90% a way to suppose about allotted methods, and 10% mapping those ideas onto nServiceBus. I made an effort to cram about three days of a 5 day working towards path I provide consumers into at some point, however I feel i was only about eighty five% a success. americans didn't have the time crucial to let things definitely sink in and ask questions, but the energetic forums and skype conversations available will probably do the trick. Erich Gamma: How Eclipse changed my Views on utility building

    a couple of individuals commented on this keynote, including Jan Balje:

    a pretty good keynote with the aid of a famous name concerning the building of Eclipse with elements about architecture, open supply, method and many others. at the conclusion he validated Jazz, a very (in reality) large ambiance for enormous dispensed software development. or not it's appears entertaining, regrettably no open source.

    Jevgeni Kabanov:

    One enjoyable issue I failed to recognize became that Eclipse now comprises

    API equipment that allow to annotate APIs with edition counsel and pleasant-grained entry manage and then make Eclipse IDE verify these for you.

    So WTF is Jazz? clarification begins with splendid clouds of fog: "integration", "community" and even "Eclipse experience". scary diagrams with a lot of arrows. begins sounding like Twitter on steroids — that you could follow activities or channels, movements are made out of each web and Eclipse plugins. that you can additionally song fundamental data like defect growth. Doubt that you could get updates to IM or SMS, although :)

    Simon Brown:

    The thing i'll say is that or not it's at all times good to hear the real-world studies about iterative building - during this case, the Eclipse crew work on 6 week iterations and do not always have a completely shippable product on the end of them. Erich wrapped up the keynote with a demo of the new Jazz platform, which draws together the entire tools on your average development suite into a completely integrated workflow. This looks like a rehash and enhancement of Rational's Unified exchange management (UCM) platform the usage of Eclipse as the front-end. That could no longer be totally accurate (I feel I saw a Subversion bridge within the slides), but you get the factor.

    Steven Mileham:

    Opening speak from Erich Gamma on how the

    Eclipse IDE has changed application construction for him and his group in the seven years due to the fact that he began writing it. enjoyable stuff, displaying the transition from a closed source assignment to an open source community venture, how they migrated from a waterfall methodology which allowed them a sluggish build of building then only to must panic close the closing date, to a greater iterative agile methodology which pressured the team to focal point extra on start and delivery. eventually he introduced Jazz as a group collaboration tool which integrates very tightly with Eclipse.

    Libor Soucek:

    The greatest take out changed into that software free up shall stick to enterprise unencumber date. The optimal date working form Eclipse aspect of view is June as this creates the smallest disruptions due vacation trips and other pursuits. they are setting up in 6 week dev. "sprints" durations (1 week planning, four building and 1 integration and code finalization/testing) all over 12 months to add new points for yearly unencumber. One month before release they completely commit all dev. substances to remaining code polishing and testing.

    What was also fairly entertaining on Erich's presentation become describing how quick fashioned effective Eclipse community become. group utterly covered aid of newly joined builders/clients, writing manuals, and so forth. which really freed fashioned IBM dev. supplies to once more do what they understand the finest - full velocity construction. this is really very interesting mannequin to agree with for similarly typed projects.

    and Maarten Manders:

    Erich Gamma's keynote was really a merchandising speak for

    IBM Rational's most exact product known as Jazz. it's a task administration utility, like Jira (the one we use), nevertheless it goes a long way beyond in terms of integration, because it works so well with Eclipse. furthermore, it looks to have a pretty good system for managing construction teams. All in all it appears like a pleasant product - I peculiarly like the fact that it changed into made in appreciate of agile development options. The massive query that remains is: How neatly does it work with php?

    Tim Anderson also gave an in depth summary of this keynote, together with:

    Gamma spelt out the Eclipse philosophy, the beginning point being that every thing is a a plug-in; that APIs count number lots and its enhanced to get a small API correct rather than get it wrong and must aid it for ever.

    He then mentioned iteration, a key tenet of agile construction. He showed a great slide which charted the progress of some tasks, from "all the time on earth" at the start, to "say goodbye to your family" on the end, followed by complete exhaustion after the element is sent. Iterative development with continual builds and signal-offs each 6 weeks is less disturbing and extra productive.

    Martin Fowler and Jim Webber: Does my Bus appear large during this?

    Jim Webber had some comments on his keynote:

    The meme of the convention for me got here from the

    keynote talk I did with Martin Fowler. The middleware companies don't seem to be giving us huge potent application as they consider, but as a substitute of proffering huge flabby software finished, with what got here out all through the talk as "enterprise man boobs."

    The slides are available at the QCon internet web page, however they mightn't make too an awful lot sense without the video (which the QCon guys will release within the coming months), apart from the photograph of the flabby bloke whose man boobs will forever epitomise enterprise middleware.

    Many people wrote about this keynote, together with Andrew Whitehouse:

    I even have in my opinion skilled what I trust is loads of useless complexity in commercial enterprise software, and it is fresh to see Martin and Jim cut via this to get a hold of a collection of ideas for useful (light-weight) birth. i'm also glad that ThoughtWorks are actively

    merchandising (J)Ruby on Rails in an commercial enterprise context as this appears a natural successor to "natural" Java development, and for my part they appear to be one of the vital enlightened consultancies on how to convey commercial enterprise utility with no trouble. (they are additionally agile.)

    Libor Soucek:

    Day became complete with top notch wonderful keynote given via

    Martin Fowler and Jim Webber on theme ESB use in SOA primarily based applications. in lots of facets it remained me shows from Don field.

    Even notion presentation changed into very nearly identical tips value as I actually have already considered recorded on cyber web as an example right here in no way much less it became massive fun time. They make so a whole lot demonstrate and notable advertising value to persuade all attending americans to decide upon internet based mostly message integration by the use of usual HTTP protocol for SOA evaluate to ISV certain solution. i might say every person have to get this message evidently presented and seriously delivery to feel a way to use it in personal options.

    Patric Fornasier:

    Jim and Martin's keynote called 'Does my Bus seem to be massive during this' mercilessly dissected existing middleware procedures. It turned into and extraordinarily sharp-witted and unique talk through which they used their complete linguistic repertoire to select on middleware companies and conceive fantastically eloquent metaphors such as "man boobs" (as an alternative of bluntly calling it fats, grotesque, bloated middleware products).

    Stefan Norberg:

    After a busy day on the office I managed to get to QCon simply in time for the keynote with the aid of Martin Fowler and Jim Webber. both of them are as you doubtless comprehend fantastic speakers and the keynote turned into wonderful. that they had slides on why EAI, SOA and ESB:s are a funny story (as a concept, to maintain), however I cannot say they offered any options. They basically pointed out:

  • focal point on business price from the first new release
  • keep it primary
  • truly notwithstanding, you regularly get probably the most company cost through purchasing third birthday celebration application. And it needs to be integrated... not that I appreciate it though. if you construct it yourself, then most likely gentle HTTP capabilities is a way to go.

    Maarten Manders:

    imagine

    Martin Fowler (in his loved leather pants) dancing on stage whereas Jim Webber is giving yet another rant on bloated business middleware (take a look at his ultimate tackle ESB's). Of route, i am speakme in regards to the evil enterprise service Bus, which has develop into so fats, that or not it's grown enterprise manboobs! The slides speak for themselves, get them here! unfortunately, there's no video yet.

    And Tim Anderson:

    TIBCO, BizTalk, webMethods, you name it, "they may be a pain within the neck to use", noted Webber.

    enterprise service Bus? should be referred to as the "faulty Spaghetti container". SOA? "A dog's breakfast."

    according to Fowler and Webber, the web is the answer. "The dumbness of the cyber web is a true win... it allows you to do issues that you simply did not believe of." The net is ubiquitous middleware, incremental and low chance.

         Squid is your business Bus... We're not going to need all this loopy middleware that middleware companies are trying to promote us. We don't like ESBs... The huge up-front middleware strategy just is rarely very sensible.

    Kent Beck: trends in Agile construction

    Kent Beck's keynote turned into an additional ordinary discussion subject matter, with a couple of people writing about it corresponding to Joachim Recht:

    One entertaining bit got here up in regard to self-discipline. I've always noted that XP and agile techniques take self-discipline to implement and use. Kent Beck's tackle this became that it become just the opposite - no longer doing XP was complicated for him. in its place, it's greater or less a question of addiction, which is where the problem commonly lies: altering a part of yourself requires an investment, but it's not fully clear when the investment will yield a earnings. sarcastically, this low cost argument is additionally used to advertise XP: push the charge into the future and pull the income closer - for example by using releasing commonly, now not gold plating, etc.

    Peter Gillard-Moss:

    there have been lots of enjoyable slides in regards to the upward thrust in checks, brief releases and lots of different agileness however the most interesting factor of the speak for me was the upward push of the brand new generation of tech savvy enterprise specialists. The historical "wizards" detectable through their extraordinary socially inappropriate behaviour are out as a generation of Nu-Geeks with social abilities like listening, group work and emotional intelligence are rising to the challenge of making companies chuffed.

    Patric Fornasier:

    Kent Beck's keynote changed into also fairly wonderful. He thinks that in the future we are able to write (even) extra checks, deploy functions more generally (apparently Flickr does it each half-hour!), work in groups which are more allotted, and solve more complicated complications. He also believes that with the upward push of a new technology of tech savvy company individuals, application developers will increasingly loose their 'wizard repute' and want to invest greater in their non-technical talents.

    Steve Vinoski:

    Kent Beck's keynote became fabulous. It became about developer responsibility, developer integrity, and the relationships builders have with these round them (right here's an excellent abstract). extraordinarily insightful, now not all of sudden of course, and protecting critical themes that are lamentably commonly taboo amongst technical people.

    Mark Edgington:

    Highlighting that the focal point may still be on social as opposed to technical skills Kent coaxed developers in opposition t integration with the enterprise americans. He cited that honesty works and hiding at the back of complexity and altering requirements is not the most beneficial approach to construct business companions and get them to trust in the software your developing. here's a simple and yet key difficulty for a lot of.

    Tim Anderson:

    Kent Beck is basically a relationship consultant, or should that be counsellor? here is now not a bad thing. Beck gave a keynote this morning right here at Qcon and talked a bit about techie themes like universal deployment (he claims that Flickr deploys each half an hour) and creating greater tests extra regularly, but the main focus of his talk is relationships within the construction team and between the crew and the business americans (if they regard themselves as separate).

    Beck says that the ubiquity of computing is changing the usual features of a programmer. When handiest geeks had computer systems, programmers were inevitably geeky - and for something rationale, that frequently intended whatever thing of a social misfit. nowadays every person grows up with computer systems, which he says makes programming more accessible to non-geeks, who've stronger social advantage.

    Antonio Goncalves:

    He failed to speak a great deal in regards to the technical skills that a team may still have but extra about social potential. No deserve to have a very cleaver technical guy if he cannot work within a crew. One grownup can spoil productivity of the complete crew. but that brings one more recruitment subject. how to consider social competencies ? This looks under estimated but as Kent pointed out, it can also be discovered. For him one of the most vital skill is to be able to hear.

    And Steven Mileham:

    The day began with a fascinating talk on Agile building methodologies (yet once more). The different point of this presentation, changed into that it was greater focused on the social knowledge crucial in a team as a way to work in an iterative, collaborative manner. His main aspect seemed to be to center of attention on what you as a team are first rate at, and making certain that your energies go into that, instead of creative spin and lies or excuses as to why efficiency wasn't what it'll had been.

    Phil Manchester of Reg Developer additionally wrote an article about this keynote:

    Beck stated wryly that traditional procedures to software construction ran opposite to economic realities. Yet, despite daring makes an attempt at change - similar to experimental work on URL-pushed design (UDD), literally producing HTML code in precise time according to an internet request, during the early days of XP - he has settled on a measured method.

    "received wisdom is that if you spend time up entrance getting the design appropriate you prevent expenses later. but the longer you spend getting the design appropriate the greater your upfront expenses are and the longer it takes for the utility to beginning earning. So a rational mannequin of utility is to design it immediately - the financial power to improvise gifts a fascinating problem," Beck instructed QCon.

    JCP

    Patrick Curran described the JCP BOF which happened on Thursday nighttime:

    The dialogue ranged over a number of themes, but the primary focus turned into on how people and JUGs may get thinking within the JCP. a couple of americans expressed problem about what they noticed as obstacles to entry (as an instance, the legal "participation settlement" that members ought to sign and which many individuals find intimidating, and all of us recognized that it's more difficult for a person to get involved than for a person whose exercise is sponsored with the aid of their agency. although, since we name our company the Java neighborhood system i'm determined to do whatever thing i will be able to to encourage and permit people to take part. My basic reason behind attending QCon was to satisfy with a huge cross-section of Java neighborhood participants and that i'm comfortable to file that i was able to accomplish that. i'd like to thank the QCon organizers for giving us this chance, and of course I additionally wish to thank everyone who attended our classes.

    Antonio Goncalves also linked his influence of the BOF:

    It become a very informal BoF, as i love them. About twenty americans turn up and with Patrick Curran, Rod Johnson, Peter Pilgrim.. we talked concerning the JCP. Rod changed into less challenging admitting that the JCP has opened up plenty. I gave my experience of being an expert member and others about being JSR leaders. We talked lots about transparency, open mailing record, wikis… ideas that might deliver extra transparency to the JCP. i used to be stunned to see that the spec chief does greater or much less what he/she desires. There are even some JSRs that already have a public mailing record. I asked Patrick what is the percent of individual taking part at the JCP. i was anticipating a determine between 10% or 20%, but no, or not it's three quarters. i am not the handiest particular person concerned in that then ;o)

    InfoQ

    Dionysios G. Synodinos described the InfoQ BOF which additionally took place on Thursday nighttime:

    At this BOF I had the possibility to satisfy

    the faces at the back of InfoQ and learn about how it evolved and the future directions. It turned into a pleasant interaction, have been a couple of contributors gave their opinions on how this suggestions-rich group website can develop.

    The BOF turned into taking so long that the crew from application Engineering Radio that have been protecting the next BOF in the equal room arrived and we all had the probability to have interaction together unless the area needed to close.

    Erik Johnson had some thoughts on leisure which arose after attending this song:

    the public "API" for a RESTful utility is its URI handle house. you can invent a list of URIs mapped to components and state sequences all you love. but the reuse skills is restricted to whatever thing your callers can get out of that URI area. Like leisure, SQL databases have a uniform interface. but seem on the essentially unlimited variety of supplies you can entry. absolutely, a leisure URI is just not a SQL remark and that i'm no longer attempting to shoehorn XQuery into a URI. All i am saying is that a URI space can comprise dad or mum-infant and relational features from an information model – the usage of relational database conduct as a ebook. This has been a key element (for eight+ years, BTW) in developing URI recommendations for our items.

    The emerging specs and toolkits, like WADL and WCF, function URI template constructs. however URI templates haven't any proposal of aid linkages (mum or dad, relational, or in any other case) and that limits their effectiveness. At QCon, there became little consensus that WADL changed into the correct approach to explain a relaxation utility. but I think relaxation description languages aid forms are coming and i'd like their creators to at the least believe useful resource linkage facets for URI templates. it's all been accomplished earlier than.

    Mark Little additionally reiterated two features about rest and HTTP that he mentioned on the conference:

  • i have been setting up purposes on the internet in view that it changed into first launched: being at university on the time, I had a lot of freedom to play. I even wrote a browser in InterViews! (any individual else remember gopher?) Anyway, I remember being completely satisfied when the primary URN thought came out because it seemed to handle probably the most considerations we mentioned on the time, in the course of the definition of a selected set of identify servers: now not would you need to use URLs at once, however you'd use URNs and the infrastructure would seem to be them up by way of the name server(s) for you. Sound universal? smartly fast ahead 10 years and that in no way came about. Or did it? neatly if you agree with what a naming service (or trading service) does for you, WTF is Google or Yahoo?
  • My friend and co-InfoQ colleague/editor Stefan has a different satisfactory article on rest. In it he addresses probably the most average mis-conceptions around rest, and specially the perceived lack of pub/sub. You what? As he and that i mentioned one at a time, it seems fairly glaring that RSS and Atom are the right method in RESTland. The feedback I received at QCon the other week put this method high on my pet projects list for this holiday, so i've been working on that for our ESB as well as every other stealth tasks of my very own.
  • Tim Anderson also mentioned the track as an entire:

    Stefan Tilkov led a music on SOA, leisure and the net. Now, the usual theme of this (following on from the Fowler/Webber session the day earlier than on the

    shortcomings of the business Bus) is that soap and WSDL and WS-* have didn't bring and that leisure is essentially a stronger method to designing dispensed inter-application programs. what's wrong with WS-*, cleaning soap and WSDL? Too many standards; too complex; too brittle; too incompatible; too few free and open source implementations; leaky abstractions; hijacked through middleware carriers who have an activity in holding expertise arcane and high priced.

    in contrast rest is being embraced for all sorts of causes, ranging from purist arguments in regards to the cost of useful resource-based mostly computing the place everything has an URI, to pragmatic arguments along the strains of "it works, i will be able to use it, I keep in mind it." despite the fact, in case you poke at one of the solutions which can be described as relaxation, it seems that some are greater RESTful than others - the use of HTTP as a transport for POX (simple ancient XML) isn't necessarily leisure.

    Steven Mileham loved learning about leisure:

    The leisure of the day I spent in the "SOA, leisure and the net" track. Having now at last grasped the conception of relaxation features, I are looking to go lower back and rewrite the entire internet features I've already developed. Whereas normal "web capabilities" center of attention on defining particular interfaces and APIs which must be normally maintained, so that if the back conclusion is changed, the consumers of that service need to be up to date, relaxation utilises the commonplace operations of HTTP;

    by using these strategies, any HTTP customer can now consume your service, the functions is recognized via a URI which describes the aid, eg; http://example.com/orders/2007 would return all orders from 2007.

    Johan Eltes of Callista wrote an extended submit discussing the challenge of complexity versus simplicity in an API, and commented:

    Former web service evangelist, like Steve Vinosk (Iona, virtue), Mark Little (HP, WS-* spec-lead, JBOSS) are spending the time bashing soap and WS-*. HTTP net functions and the structure represented by using relaxation is the brand new reaction to the over-advanced best-practice. relaxation has been used for decades and is core interfacing know-how at global players like Google. Amazon is additionally increasing using rest. looking at the history, is there anything else certain with leisure, that stops it from beginning its journey up the complexity scale, repeating the history of mainstream pre-decessors? both that, or fail due to lack of ability of accommodating new necessities? Are we heading rest-* ?

    relaxation: a pragmatic Introduction to the internet's structure

    Jan Balje had some comments on this presentation:

    As this become a new idea to me, I determined to hear in. a superb speak, although I did not absolutely keep in mind it in one go. It seems leisure is a set of 5 principles which that you would be able to follow when setting up webapplications. This offers you lots of technical probabilities. but as far as i can see it be an alternative choice to webservices. a vital new style already and we nevertheless have not complete with the outdated one.

    Dionysios G. Synodinos additionally loved this prsentation:

    an outstanding presentation on the simple principles of rest and why be sure you care about it. it is exciting to see that after so an awful lot technological elaboration the remaining few years, it's all coming returned to the fundamental nature of the WWW.

    the use of relaxation to support WS-* - building a RESTful SOA Registry

    Stefan Tilkov wrote a detailed abstract of this speak, including:

  • talk is ready making use of relaxation to a real application issue - managing web features metadata
  • Hasn't viewed internet usathat are also APIs - e.g. individuals can not set accept headers for debugging purposes of their browsers
  • benefits of AtomPub: clear habits of post, GET, PUT, DELETE
  • perhaps there is usually a generalized rest or Atom query language
  • main issue in SOAs: have faith as a root trigger
  • WS-* metadata is never adequate for the precise world - some real life annotations are necessary
  • Lifecycle managing - still basic, greater coming in version 1.1
  • rest, Reuse, and Serendipity

    Stefan Tilkov wrote an in depth abstract of this talk, including:

  • "The definition of a legacy software is 'one which works'" -- QoTD!
  • EAI products usually centralized hubs, proprietary and expensive, expensive
  • Code generation (even if from WSDL or from code) creates deceptively massive buyer-service coupling
  • Integration issue summary: proprietary approaches too costly, usual procedures focal point on implementation languages, not dispensed techniques considerations, new interfaces -> new utility protocols (something he on no account notics ), advert hoc records formats coupled to interfaces -- all of this inhibit reuse
  • a query to believe -- became the pipe invented on day 1? Or found later -- serendipity?
  • most of the stuff Steve's done during the past -- building ORBs and such -- dealt with the results of having a particular interface (generating code, growing the runtime infrastructure). Most of these items disappears in rest
  • praise for the rest dissertation - "the clearest architecture document he is examine"
  • abstract: RPC-oriented methods are trying to prolong language paradigms over the wire -- encourages adaptation (in methods, datatypes), which can't scale
  • relaxation is goal-developed for dispensed systems, accurately separates issues and allows for restrained variability best the place required
  • Antonio Goncalves also gave a summary of this speak:

    He all started with an architectural slide showing interoperability between diverse techniques using DB, SMTP, HTTP, mom (expensive), ESB and EAI (identical element, simply relabelled), JCA, RPC (ignores partial failure), JAX-WS (marshalling/unmarshalling)... before speakme about relaxation, Steve talked a little about Unix pipes. they've a extremely uniform interface and usual file descriptor. Any command can take anything in enter (stdin), produce whatever (on stdout) and deals with errors (stderr). it's why we will mix them in any way. leisure has additionally a uniform interface (GET, PUT, post, DELETE) and you may pipe resources and inspire combination of orthogonal application.

    Diary of a Fence Sitting SOA Geek

    Stefan Tilkov additionally wrote unique notes about this speak, together with:

  • 2000-2005: spent 5 years going backwards to distribution transparency - it looks like 1970 far and wide once again
  • Distribution must be specific, in any other case you might be now not able to take care of failures
  • problems with tight coupling introduced by means of making an attempt to make a faraway interaction look like a native interplay
  • uniform interface enables generic infrastructural asupport
  • selected interface permits for more confined typical guide
  • requisites: The net is a collection of necessities, common adoption has to count for whatever, relaxation/HTTP is ubiquitous
  • a couple of how to dermis an internet-Scale Cat

    Stefan Tilkov had detailed notes from this speak, corresponding to:

  • Schizophrenic on whether or no longer to choose messaging or internet
  • The XML fairy sprinkles pixy filth (which might also really be crack cocaine) for your commercial enterprise techniques
  • not every little thing must be an OASIS regular. We understand not to take a leak in public. (He mentioned this )
  • Serendipity is great - don't let the RESTafarians inform you distinctive
  • Innovation at the edges of the internet - no longer by using some relevant design authority such as the W3C
  • With changing contracts as part of a resource, we can not be too fundamental anymore
  • abstract: both the internet and internet services group suffer from piss-terrible patterns and practices and awful tooling
  • Patric Fornasier additionally commented that this speak "confirmed some pretty wonderful ideas that use existing net infrastructure (i.e. no WS-*) for integrating functions and realizing business workflows", and Mark Edgington pointed out that this speak became "As expected a full power opinionated speak on why leisure in conjunction with the internet as your commercial enterprise bus is leaps and bounds above anything else companies or WSDL and The WS-* (loss of life famous person) specs need to present".

    Maarten Manders described what he noticed as a new method of utility construction according to the cloud:

    need some more storage? Take S3. need to promptly scale up with one more 20 servers? Take EC2! need to get to a user's mails, calender and different stuff? Use the functions of fb, Google and Yahoo. in the conclusion, just mash it all along with Yahoo! pipes! I believe it changed into Nati Shalom, who made this unique statement about cloud computing: establishing new functions yields very small risks at the present time, since it's so low-priced & convenient to plug together your utility. in case you stumble, you might not fall hard. And in case you prevail, the cloud will do the heavy lifting and aid you scaling out. in my view, this can be the subsequent massive jump to make (internet) construction once again extra agile after the uprise of dynamically typed languages.

    Filippo Diotalevi referred to that this tune changed into "the most exciting music I attended at QCon", and that:

    Cloud computing may also be viewed in two alternative ways:

  • from developer/architect viewpoint, it is an architectural style that relies on the idea of having a "cloud" of (unlocalized, dynamic, allotted, unreliable but redundant) features that will also be found and used by using purposes
  • from a "consumer" perspective, it will also be seen as a means of developing new functions without a (or just a few line of) code, readily wiring collectively diverse functions and content material suppliers freely accessible on the cloud (cyber web)
  • Amazon functions: building Blocks for authentic information superhighway purposes

    Jan Balje described how Amazon's capabilities are eliminating probably the most excuses for challenge screw ups:

    Most programmers or college students use lack of hardware-supplies as some of the causes their project did not meet the expectations the academics (or themselves) initially had of it. If we had more computing vigour, they say, we could have made this or that feature working, we could have some greater work done within the little time that become accessible for the challenge, or the question should not have taken as long because it does now.

    Jeff Barr from Amazon.com has put the deceive these styles of arguments. Being, in his personal words, a real net-carrier evangelist, he brought the gathering to the different Amazon.com, the one which in the mean time has three statistics-centers (two within the US, one in ireland) that enable all and sundry to get as much computing-vigor as they want on the fly, for a extremely little amount of cash. Amazon has created web-services that cope with all the muck (as the different guy from Amazon, Jeff Bezos, used to name it) of programming, comparable to load-balancing, initializing servers and features and that sort of extra mundane work. as soon as registered, clients can stir up servers using a FireFox-extension and ssh to them automatically. If needs be, an additional server will also be fired up the use of the exact configuration of the first one.

    Jevgeni Kabanov gave an overview of the Amazon capabilities described throughout the speak, together with:

    the first a part of the speak is about

    S3 file internet hosting, which is carried out through a Firefox plugin (which I mistook for FireFTP first). you could add information, assign ACLs, get the URL for publishing and pay proportionally to storage used, requests performed and bandwidth used (all three have assigned prices). Nothing technically fancy, but cool even so.

    The subsequent half is ready EC2, which is a digital server on-the-fly renting. You in fact store a (special) disk graphic on the S3 carrier and then boot from it a few virtual servers. You get root access to your servers and pay per hour of use. that you could add/eliminate servers both programmatically and from a Firefox extension.

    Steven Mileham turned into surprised to find out about Amazon's capabilities:

    I wasn't conscious that Amazon even had the rest during this sector, i used to be anticipating functions for e-commerce to be honest. What they definitely coated even though, become a completely scalable server infrastructure upon which you might run any software you desired. the usage of their server farms, they host a lot of digital servers, which for an inexpensive fee, can also be dynamically created, clustered and utilised for an arbitrary period of time, charged with the aid of the hour and storage. advent of servers was fully scripted to permit for scaling when demand reached a particular factor or more storage turned into required.

    An nameless attendee appeared at the cost merits of using these features:

    Given the costs and inflexibility that standard, old-fashion computing centres, it is definitely an enchanting alternative for us. a quick calculation tells me that to replicate part of our infrastructure the place Amazon might possibly be a good suggestion would can charge us about $900/month. I do not know the genuine figures of our existing statistics core company, but i would be shocked if it was that low.

    Mark Edgington additionally attended this speak:

    I already use Jungle Disk which is the amazon S3 (primary storage provider). but this speak went throughout the total set of features, giving satisfactory perception into each to impress thought, as to abilities makes use of. Of awesome activity to me became the Elastic compute cloud, allowing for speedy scalability and setup, with a time, bandwidth and computing energy pricing model. The up and coming primary DB, an object database seemed very pleasing.

    software capabilities on the web: SalesForce.com

    Johan Eltes of Callista mentioned some thoughts that this presentation brought to intellect:

    So SalesForce is just an illustration of an software constructed on the Forces.com SaaS platform.

    The platform has loads of nifty 4GL points that reinforces building of company functions (the area of force.com). The greater I heard about force.com, the greater it made me think about SAP MySap ERP utility and the enterprise application platform on which SAP functions have been constructed for ages.

    The loop become closed when the SalesForce architect revealed a proprietary company good judgment language named Apex (The SAP enterprise good judgment language is named "ABAP"). As SaaS grows, it might be pleasing to peer if force.com becomes the "SAP of SaaS".

    Google GData: studying and writing facts on the internet

    Mark Edgington summarized this presentation:

    The google statistics API talk concentrated on selections behind the alternative of relaxation over cleaning soap; definitely RESTs four operations get,put, publish and delete are likely to cowl ninety% of your wants. also the extensions they have developed around question, authentication, concurrent operations and batch updates. These ideas had been tied in nicely to examples of use and comments concerning the advantages of building on or with necessities; much less should document a huge one.

    Yahoo Pipes: Middleware within the Cloud

    Mark Edgington had some options after this speak:

    I posted about pipes about a 12 months ago and it has given that accelerated its modules from 20 to 50 and makes up 1/3 of all mash-up calls to Google. I really want to play with it some greater, it in reality is terribly cool, bringing loads of vigour with out the should code and enabling people that can to spend greater time on the functions that consume the data.

    Panel: Programming the Cloud

    Mark Edgington described this panel as "absolutely the spotlight of the day to date":

    The panel of the times presenters lined the total spectrum of cloud computing from current place to future concerns. I have five pages of notes from this so not one for my N810 or my thumbs will go dead. the important thing elements of interest to me where the fact that the cloud is virtually a renewal of some historic technology ideas that did not reasonably make it, jumbled in with ordinary tried and validated ideas and innovative pricing. If there become or should be a key difficulty it must be safety (believe), i feel it will only take one predominant safety breach (loss or steal of facts) and it could take down a company; many will ought to base themselves firmly round have confidence so one to watch.

    Mark also discussed the Rubik's cubes that have been given to every member of the panel.

    Libor Soucek had some usual concepts on this music:

    Banking tune became very wonderful for me no longer most effective as a result of i am working in exactly equal domain field however additionally as a result of challenges imposed by means of high extent/low latency techniques demands very smartly balanced architecture with extraordinarily cautious selection of technology in use. furthermore in this area is right that one of the crucial latest/top-quality stuff of rising applied sciences is not all the time usable right here (i.e. for example dynamic languages, WS-*, etc.)

    expertise in the funding Banking house

    Simon Brown gave an outline of this speak:

    First up turned into John Davies who jumped in at the closing minute because the speaker for that slot couldn't make it to the convention. as a substitute of a session about area selected languages, John offered a top level view of technology within the funding banking space. It changed into a very interesting speak and very properly summarised many of the tendencies that we've got seen over the last few years (e.g. compressed on the wire message codecs in preference to XML, and so on). the key takeaway aspect for me turned into that you just deserve to design for scalability. here's one of the most explanation why I think it be vital that software techniques have an express and intentional architecture, with somebody taking responsibility for it.

    Libor Soucek additionally had some takeaway points:

    in fact not one of the presented utility on "banking" track did even contact home windows and/or .web based gadget to my shock! in line with John Davies presentation 80-85 % purposes are in fact written in Java during this domain. relaxation of "market" share is then predominantly occupied by using C/C++ due its efficiency/memory capabilities and predictability of execution (i.e. all "usual" GC based mostly environments are combating with unpredictable time of execution on near genuine time software with low latency right here).

    protecting 99.ninety five% Uptime on four hundred+ Key systems at Merrill

    Maarten Manders was impressed through this presentation:

    I consider, the top of the line talk on the Banking tune was held by using Iain Mortimer, Chief Architect at Merill Lynch. He told us how they accumulate 9 billlion monitoring messages a day! It seems that every element of their infrastructure and application stack is normally producing monitoring messages and they in fact seem to care about microsecond latencies while doing so.Naturally, essentially the most difficult assignment is to make experience of this log tsunami. The aim is to reliably spot system failures with out getting spammed by way of pointless alerts. So if as an example your hard disk is full, your device will produce lots of error messages: first off you're going to get a capacity error. Then, info can not be written anymore, queries fail, your carrier queues stack up and finally, you will run out of reminiscence. almost all these failures will generate a lot of redundant error messages. however, the one and most effective message you might be interested in, is that your disk is full. Fixing it's going to make the others disappear - that is known as correlation.

    Mark Edgington additionally had some suggestions on this talk:

    It offered a really clear view of how Merrel Lynch offers with the billions of each day messages, produced with the aid of there systems globally. The spoil down of message priority and the purpose of automated fixing of an issue within an 18 2nd window, turned into very interesting. The compounded concern of differing seller error messages, dashboards and the overarching job of mixing these into monitoring dashboards at a zone, web site, vicinity and international degrees changed into a real eye opener.

    Simon Brown also attended this speak:

    however this became a relatively enjoyable session, I do suppose that the title was deceptive. instead of speakme about how the ninety nine.95% availability target become being satisfied, Iain talked about how Merrill monitored those techniques, and primarily in regards to the rules that they used to computer screen those techniques. Iain noted that their availability requirements allow for 18 seconds of downtime per day, but did not go into element about any failover or recuperation techniques that allowed them to meet that purpose.

    precise-time Java for Latency essential Banking purposes

    Simon Brown gave a summary of this talk:

    although there have been a few banking examples thrown in, this session become practically a normal RTJS speak. The closest I've obtained to true-time Java is BEA's JRockit JVM with deterministic garbage assortment however, as Betrand said, rubbish assortment is just one part of the story - Java apps also undergo jitter from the JIT compiler kicking in at unwanted instances, and so on. whereas this isn't some thing i'll doubtless try out myself (sun's precise-time Java VM only runs on Solaris 10 in the meanwhile), what they've finished is developed a framework onto which that you could build your functions where you come to a decision which constituents of it are ordinary Java, gentle precise-time or complicated-actual time. My realizing is that the tough precise-time stuff is made possible by using utilising the underlying OS real-time threading and a few suave use of non-heap memory areas, in addition to as it should be scheduling the rubbish collector in order that it does not interfere. Cool stuff and i consider we'll be seeing this pop up within the banking business soon.

    From having a bet to Gaming to Tradefair

    Nik Silver had some feedback involving this presentation:

    Even the very selected presentations contained useful facets that may well be generalised and reused. for example, Matt Youill and Asher Glynn of Betfair talked through how they scaled the transaction processing on their servers by 100-fold. Guardian.co.uk doesn't need that type of throughput, so the details were essentially of highbrow improvement. but a key useful lesson turned into how they approached the issue: by way of featuring it to trade gamers as a problem carrying outstanding kudos to the winning company.

    Simon Brown additionally attended this presentation:

    subsequent became Betfair speaking about their new Tradefair platform and some of the challenges that they deserve to overcome to supply a totally scalable, totally available buying and selling platform. once again, there changed into some pleasing discussion of the complications and excessive-stage solutions, however many individuals (myself protected) came out of the session no longer actually knowing what they'd completed. They have been very sketchy with the details and i'm left questioning why they couldn't have carried out their equipment the usage of something like JavaSpaces (what they described appeared like a JavaSpace - put many issues in and match them up). The issue I did like concerning the session turned into their openness in admitting that none of the options were surest (all had trade-offs) so that they needed to opt for the one which fitted their wants essentially the most.

    LiquidityHub

    Simon Brown described this as "one of the most most beneficial periods of the day":

    It presented an outline of the company issue, an overview of the chosen structure and a look at how one of the most technologies were used to construct the platform. This assignment suggests that it's viable to construct a excessive volume, low latency platform with mainstream Java-primarily based technologies. BEA's JRockit JVM changed into used to reduce the jitter of the Java runtime, making it possible to obtain a provider stage agreement stating that messages may still flow through the platform in under 100ms. With its first rate coverage of every thing from the enterprise issue right down to one of the most implementation particulars, this was a fine method to end the first day.

    Jan Balje additionally gave a summary of this speak:

    These people faced concerning the equal problems because the outdated ones. They had to obtain anything like 20.000 transactions *per second* with a latency of highest 100ms. They executed this the usage of Java! the key became Weblogic true Time, a choice JVM implementation with real time ensures.

    The Busy .internet Developer's ebook to F#

    Ola Bini attended this speak:

    Me as a Ruby person and programming language nerd had quite a wide selection of tracks. i stopped up seeing Ted's presentation on F#, which made me suppose: wow! Microsoft took ML and did exactly what they've accomplished to all languages on the CLR - added help for .net objects in the combine.

    Haskell: functional Programming on Steroids

    Dionysios G. Synodinos commented on this talk:

    however the title of the presentation had changed from the one in the time table, the part concerning the steroids turned into a hundred% representative of the speaker. a person of an tutorial history, working for Microsoft analysis and keeping a GNU licensed Haskell compiler... wow that man became impressive

    An nameless attendee also delivered "naturally, effortlessly the most advantageous lecture of the complete conference. lamentably, i was a little overwhelmed via it and didn't take make many notes".

    features + Messages + Concurrency = Erlang

    Many individuals discussed this presentation, including Jan Balje:

    After that we went to the presentation about Erlang, a brand new programming language it really is peculiarly suitable to be used with concurrency. The language is hot on the fashionlists and could become very valuable with the rise of multicore systems. Take a glance at the slides after they are available. One to watch. Joe Armstrong (called "the nutty professor" by using one other participant) additionally wrote a ebook about it.

    "Paul":

    i was lucky to attend a chat at

    QCON2008 by means of Joe Armstrong. He cited no-one in the hardware world is at present expecting a limit to scaling by multiple cores; there's anticipation of thousands of cores within the subsequent 10 years. Joe additionally mentioned Amdahl's legislation and mentioned that if 10% of your application is serial then the most speedup that you can get is 10x. this is very concept-frightening: we are able to should push concurrent programming into the core of development however, from my own experience, we desperately need new programming paradigms to make certain we don't create terribly buggy utility.

    And Steve Vinoski:

    The better part of the week, though, became attending to meet and hang around with Joe and different Erlang folk. Joe's really a superb man. he is fairly lively, and his mind simply would not stop. he's interested by loads of technical issues past Erlang, and that i discovered discussions with him to be crammed with exciting questions and insights. Given the indisputable fact that I work with Erlang quite a lot this present day, my hope getting in became without difficulty that i would get an opportunity to simply say hello to him, however I grew to become out to be fortunate satisfactory to spend many hours with him over the course of the conference.

    An nameless attendee also wrote up an in depth summary of the speak, together with:

    Erlang is well-nigh a usual-goal, however turned into designed for a selected area: telecom switches. These programs are enormously concurrent (with hundreds of thousands of parallel activities), with gentle precise time necessities, with huge community distribution, high availability, and very significant utility (LOC of >1M) it really is required to be upgradable without shutting the rest down.

    except 2002, one might hit the total chip in one clock cycle. So cores stopped getting higher however more a large number of.

    therefore:

  • every yr, a sequential application will get slower
  • each and every 12 months, a concurrent program will get quicker
  • Peter Pilgrim additionally attended, and gave an in depth abstract:

    Why become Erlang invented? it's two decades ago, invented to clear up totally concurrency mobile switches with traffic a hundred thousand actions in actual-time. Telecom is the world's planet-huge biggest dispensed laptop.

    Why is Erlang fitting generic? within the 1980's chips acquired larger and the clock frequency acquired quicker then quicker. at some point the pace of easy ran into you. The restrict of Amdahl's law changed into expected in 1992 but actually was breached in 2002. You could not physically hit one hundred% of the total chip in one clock cycle, therefore the velocity-of-gentle the distance messages by way of electrons can trip changed into impossible to cover. hence the technology modified to mutliple core (multi-core).

    :

    The Busy Java Developer's guide to Scala

    Dionysios G. Synodinos had some techniques about this presentation:

    Ted's shows are both informative and unique. He has a means to communicate his recommendations without delay to the viewers and a very varied sense of humor to sugar-coate it all.

    some of the impressions that this talk left to me is that besides the fact that this genre of languages is getting tons consideration this present day, nobody in fact has a whole lot event within the commercial enterprise box and the precise patterns of usage are yet to be based.

    Peter Pilgrim also had detailed notes about this speak, including:

    Quickshort in Scala is a lot shorter than the equivalent in Java. one more illustration turned into Prints XML to the console. Arbitrary area holder syntax the usage of Scala XML framework. Scala supports XPath syntax the use of libraries that are only imported, as a result of Scala has makes it possible for feature names with arbitary characters. Scala doesn't have any sense of operation usual. Scala is a pure object oriented language in the sense that each value is an object. Scala is also a practical language.

    Open area session

    Danilo Sato mentioned an impromptu Open house session which took the place of a cancelled speak:

    The track complete with an Open area fashion session, the place members discussed about which elements are using the increasing pastime and resurgence of distinct languages. For me this become essentially the most exciting dialogue of the day and it bolstered the case for polyglot programmers. probably the most syllabus was that it usually takes years for someone to become an expert at anything and that it's harder to leave that competencies in the back of to gain knowledge of whatever new. I suppose that it all comes right down to whether you wish to be a professional or a generalist and i've already stated my place of trying to be each. one other interesting aspect of the dialogue became Martin's aspect that the evolution occurs in cycles and that after a duration of stabilization, it's time (once more) for broadening the alternate options and looking for brand spanking new ideas so one can lead us to the subsequent huge element. In these times it be vital to look for new getting to know alternatives as a substitute of narrowing your abilities. I think or not it's time for me to make use of the generalist hat for a long time... :-)

    Concurrency, past and latest

    Peter Pilgrim wrote a detailed summary of the talk, including:

    Brian Goetz doesn't predict individuals to dump Java and movement to JKOCaml, Erlang or other mannequin any time quickly.He promotes "Immutable object the place which you can". surprise, surprise. sometimes it more affordable to make a copy than it's to share. Copying an immutable object is at all times thread secure.

    He recommends to take a glance at Scala, in specific the Scala Actors library.

    blending Java with Dynamic Languages

    Ola Bini had compliment for this speak, asserting "This talk become valuable in explaining why you'll want to do something like this, and why or not it's such an impressive technique."

    Phil Manchester of Reg Developer also wrote a piece of writing about this talk:

    Venkat Subramaniam, the chairman of application working towards business Agile Developer, instructed QCon Java has grown past a language and the pleasure is now centered on the aggregate of the Java platform with dynamic languages equivalent to Groovy, JRuby and Jython.

    "Multi-language environments imply that you can get full interoperability between constructs created in distinct languages. Dynamic languages additionally deliver you the power of metaprogramming and domain-selected languages. This improves productiveness and permits clients to be greater expressive," Subramaniam referred to

    Evolving the JVM

    Peter Pilgrim wrote a summary of this presentation, including:

    Dynamic byte code loading - latest method of introduce arbitary byte code is cumbersome. ClassLoader, JVM memory high priced. actually a solution would be to make use of anonymous classes that comprises the byte code.

    Continuations - almost Ola proposed direct potential to operate stack manipulation interior the JVM.The conception is pretty effective as RIFE has a library for this. The theory of continuations allows work circulation based mostly and dialog state computations to paused and resumed.

    The Cathedral, the Bazaar and the Commissar: The Evolution of Innovation in commercial enterprise Java

    Dionysios G. Synodinos wrote a summary of this presentation:

    This presentation built upon

    Eric Raymond's seminal paper that analyses why open supply works so neatly, which changed into named "The Cathedral and the Bazaar".

    The addition became the Commissar, a role coming from the Soviet Union that became Rod's perception of the genuine function that the Java neighborhood technique plays within the evolution of the Java ecosystem. This turned into a tough metaphor and he tried to returned it up with a number of examples from the fall of the us.

    during the past lots of his preachings, just like the light-weight approach of POJOs as an alternative of EJB, have managed to impact the progress of Java. here's more evident than ever in Java EE 5 and the roadmap for the proposed Java EE 6. It can be enjoyable to peer if his views on how the JCP may still alter its modus operandi, will in fact convince solar to essentially reorganize the system which drives the Java future.

    Tim Anderson additionally mentioned this presentation in detail, including:

    Johnson requested what looks to me to be a key query: what should still be standardized? He said that it's foolish to are attempting both to innovate and to standardize on the identical time, since the committee will get it wrong. you'll want to standardize in areas which are neatly universal, understood, and proven available in the market.

    despite appearances, Johnson is not an enemy of the JCP. He spoke warmly of the latest chairman, Patrick Curran, who is attempting to reform the corporation; and feels that genuine growth is being made. Curran was also at QCon in search of opinions on the JCP and its future.

    Johnson additionally feels that Java has moved on. "The Java world isn't any longer a one-birthday celebration state," he mentioned.

    Antonio Goncalves additionally wrote about this presentation:

    It changed into a every now and then tough view of the JCP. Being an expert Member and having followed Java EE for a long time, I need to say that I share most of what he noted. His presentation was divided in three parts 1) What are the sources of innovation : disagreeing with individuals, experimentation, competitions… 2) background of Java EE : earlier than J2EE (dealer locking, fragmented market), the promise of J2EE (JCP becomes dominant, it creates a market), the decline of J2EE and the rise of open supply. 3) What's subsequent. that's the place Rod talked concerning the cathedral (one company creates it all), the Bazaar (many people in a disorder method create it) and the Commissar (a dictatorial approach of doing business, i.e JCP is the USA commissar). Now, open supply isn't a Bazaar anymore but can be more considered as a cathedral (JBoss, Eclipse, Spring...). The JCP would not control Java, there is additionally OASIS, OSGi, W3C, OMG, Open source...

    Peter Pilgrim also wrote certain notes on this presentation, together with:

    Open source produces speedy experimentation/assessment cycles. greatest adventure within the future of the JCP isn't linked to Java in any respect, opinied Johnson. obviously, he believes, solar is awfully excited by open supply for the reason that sun has lately purchased MySQL AB for 1billion dollars in shares and shares.

    What does tomorrow seem like? From the anticipated and regular standardisation cycle that Johnson described, he pointed out that we are in the a part of the cycle where are within the lack of innovation, at the least coming from the JCP. We should aim to maintain the merits of the requirements without loosing the innovation area. alternate has to be more speedy. JCP needs to adapt to survive.

    Evolving the Java Language

    Peter Pilgrim posted lots of the issues of this presentation, including the long-time period dreams for Java:

    * Regularise present language** Reification** further Generics simplification

    * Concurrency support** Immutable statistics** manage Abstractions** Closures** Actors, and so forth

    Simon Brown also attended this talk, and had some options:

    The ultimate session I attended became Neil Gafter's appear on the new points which are being considered for Java 7 and past. I've now not been following this too intently and it became unique to capture up with it all. probably the most things that struck me most turned into that the Java platform JSR hasn't even been began yet and that solar do not appear to have ample resources to do every little thing that they wish to (curiously JavaFX is extra important?). i used to be below the affect that predominant releases of the platform had been going to be on an 18 month cycle, however naturally it truly is no longer going to turn up. I also don't always understand where/how the open supply stuff suits into all of this. There are some nice smaller points being considered for Java 7 (multi exception catching, handy exception rethrowing, the capacity to turn on Strings, etc) however part of me thinks that maybe the larger language adjustments (e.g. closures) just isn't applied. perhaps it could be more advantageous to cease making big alterations to the Java language and start placing extra effort into whatever else (e.g. Scala, Groovy, and so forth).

    Antonio Goncalves additionally commented:

    basically, the roadmap of Java 7 remains uncertain. Has Neal observed, the residences concept might no longer be on JDK 7. And the closure subject came along. Neal pointed out anything rather humorous about that "loads of organizations desire closure except two : solar Microsystems and my boss (Google Inc)". definitely, as complicated it is to consider, the JSR for Java 7 hasn't even started yet. And as Neal brought up, there aren't sufficient supplies at sun to make it take place in a decent timeframe (seems like groups are busy with JavaFX).

    Architectural Implications of RESTful design

    Michael hunger had a number of recommendations about this presentation, and described the basic principles of the talk as:

    1) all elements are named by an URI2) materials are immutable and copied3) you could assemble arbitrary URI which present a computation and use other URIs as parameters(e.g. energetic:imageOperation+operation@fllcc:/doc/rotate45.xml+picture@http://imageurl)

    With these precodition Peter showed a sort of functional programming strategy. You simply write (or have equipment write) your programm (function, expression) as a cascade of URIs.

    Tim Anderson also attended this talk:

    Peter Rodgers of 1060 analysis spoke about his NetKernel, which is a sort of leisure runtime. "i'm typing byte code", he explained, as he put collectively URI strings that performed a lot of operations. He accompanied that tons computing may also be decreased to doing anything to some useful resource with one other resource, and that this can be expressed as a URI. here's an illustration:

        lively:toUpper+operand@ffcpl:/demo/records.xml

    In effect here's practical programming via URIs.

    Introducing Spring Batch

    Phil Manchester of Reg Developer wrote an article about this speak:

    Dave Syer, one of Spring Batch's lead committers, observed around forty agencies are working with Spring's Java-based mostly framework, which aims to change growing older mainframe batch functions written in Cobol. it works alongside SpringSource's business Java tools comparable to Spring Integration.

    Panel: Open source and Open requirements

    Patrick Curran described the ambiance at this panel:

    The session become well-attended, and the dialogue changed into energetic. On the complete individuals were supportive of the JCP, and trust within the importance of the work we do. It turned into argued that both open supply and open standards have their vicinity, and that they can and sometimes do complement each different. (Open supply methodologies allow comments from true-world users, thereby improving requisites, while standardization encourages adoption and interoperability.) Some contributors of the panel and the audience expressed widely wide-spread issues - that the technique is weighted towards people, that we need to be extra open and transparent, and that we may still adopt open-supply building and licensing models for Reference Implementations and conformance test suites (TCKs). i'll be certain to take this comments into account as we work to evolve the JCP over the arrival months.

    Panel Discussions: Architecting for efficiency and Scalability

    in addition to a summary of the panel, Simon Brown said:

    the first session I attended on day 2 become known as "Architecting for performance and Scalability", where representatives from Terracotta, (Oracle) Coherence, GigaSpaces, and so forth (and eBay) got here collectively to speak about the distinctive approaches to building scalable techniques. It was enormously civilised and it became entertaining to examine and contrast every supplier's strategy to coping with the scalability issue.

    Clustered structure Patterns: supplying Scalability and Availability

    James Governor wrote a detailed abstract of this talk, including:

    i'm sitting here next a guy that works at a big investment financial institution and he says its a fascinating and floor-breaking method.

        "Terracotta does for distribution of state what the garbage collector did for managing reminiscence".

    Which appears like a great transition to Ari's pitch. As typical Ari starts at the beginning, with the truth he developed the clustering architecture for Walmart.com. The story is a really respectable one since it considerations the realities of topdown vs backside up architectural engineering.

    Jevgeni Kabanov additionally enjoyed this speak:

    The most beneficial speak i have been to to this point is

    TerraCotta's introduction and patterns. Ari is a great speaker with passion, intensity and pace that i love (even though some others might find the talk a little too informative).

    I've heard about TerraCotta before, but this became the primary time I got to grasp the particulars. The fundamental performance that they claim is transparently clustering your objects, in order that all changes on one JVM are visible in all the relaxation.

    Mark Edgington discussed this presentation as neatly:

    Ari Zilka CTO of Terracota gave a brilliant presentation on how the product works and the way it can be used. i was not going to attend this session, but he become amazing on the old classes panel, so i used to be drawn to it. His view on the area of the use of stateful in memory information and replication goes towards the views of many, however is very compelling. i could be searching into it deeply.

    As did Antonio Goncalves:

    Ari Zilka session turned into Clustered architecture Patterns offering Scalability and Availability with Terracotta. Coming from application server clustered, Terracotta looks like a fresh know-how… but additionally hides some magic behinds. It hooks into a JVM to duplicate object graphs throughout JVMs. One sentence that came often became : serialization of object is high priced, so just do not serialize them. Terracotta replicates reside objects, doesn't serialise them, that is why it will also be 10 times quicker than commonplace caching or clustering.

    testing with the aid of illustration with Spring 2.5

    Steven Mileham attended this speak:

    After the eBay presentation, I wandered over to the solution tune to try the testing framework for the Spring platform. really it creates a wrapper round JUnit three.8, 4.0 or TestNG that allows you to "wire up" an application via Spring configuration and Java 5 annotations.

    GWT + Gears: The Browser is the Platform

    Antonio Goncalves spoke of his impression of this speak:

    After he presentation I definitely had some doubts about choosing Flex for rich client. I feel Flex is a really effective platform to Boost wealthy information superhighway applications but GWT looks in reality promising and it's Java, no longer action Script. Didier did many demonstrations and complete with a humorous slide predicting the death of JSPs, ASPs. IT background is full of predictions, let's examine if this one occurs or now not. GWT compiles Java code into JavaScript but in a extremely effective way : one javascript file per browser (no greater if IE then else if Firefox… for your code) and the code is obfuscated. On of is full demo became best 60 Kb of javascript (that you can't and don't are looking to study).

    Didier Girard also posted all of the demo applications that he used throughout this presentation on his blog.

    The DOM Scripting Toolkit: jQuery

    Remy Sharp gave an overview of his talk, and additionally described it as:

    final Friday I did my first little bit of public speaking. I introduced jQuery at QCon.

    John asked me a few months ago, so I pushed the fear aside to deliver room for the flattery and agreed.

    if you are studying this blog publish, and also you did happen to see my presentation, i might basically like to hear your feedback - good or unhealthy - it's all very positive to me.

    Tackling Code Debt

    Simon Brown wrote about this talk:

    Following this changed into a session entitled "Tackling Code Debt", which basically focussed on why continual refactoring is basic to maintain a top quality codebase. This seemed to be a rehash of some of the present cloth around refactoring and agile building. some thing that did ring a bell though changed into that someone should take ownership of this entire system and motivate the team to refactor while they increase. i'd say that's part of the

    architect's position.

    Therese Hansen enjoyed this song:

    There are a number of super speakers during this track which include Linda who always works the subject from a funny angle - today it became the attitude of cycles and it sparked a fine dialogue about sleep cycles and work cycles. I actually realized anything very positive that i will take with me home - human beings work/sleep most effective in ninety minute durations and for this reason it is most efficient to do every thing in multiples of ninety minutes. And concerning work it's important to take breaks and to focus on one factor at a time and several of the viewers individuals had statistics backing up that commentary.

    Managers in Scrum

    Carl Knibbs posted notes and diagrams from this speak.

    Agile Mashups

    Jan Balje mentioned this presentation:

    a chat about how teams within the box do not follow the XP/DSDM/Scrum-e-book, however combine practices that work for them. Nothing in fact new, but a pleasant confirmation from the speaker who has lots of contacts in the container. The room is packed, testifying to the carrying on with activity in agile methodologies. by the way, a 'Ziffer' is a 0 feature new release. by the way, the percentage of ladies in the viewers is greatly better than in our students. maybe it be just a dutch issue?

    "Paul" also attended this talk and introduced a few techniques, together with:

    I attended Rachel Davies' talk at

    QCON 2008 about Agile Mashups. She made the point that in the real world people take a number of practices from distinct Agile methods; as an easy example there are Scrum groups the usage of TDD and XP groups using burndown charts. She cited just a few practices that appear extra optional, akin to pair programming and sitting collectively.

    I discover there's a very unique anxiety. On the one hand I consider or not it's crucial to know what "good agile" seems like. there is a hazard that some groups throw away their documentation, hack and declare to be Agile. in an effort to kind this "cowboy agile" from the genuine component, you may use the Nokia look at various, which is a checklist: tick the packing containers and you are doing Scrum :-)

    "Paul" additionally mentioned the thought of polishing Iterations:

    In Rachel Davies' Agile Mashup speak at QCON 2008, she noted that many teams have a "sharpening" iteration, the place no new performance is launched.

    My crew have these days delivered this: we find we want a bit of space to step lower back and examine the utility from a "large photo" aspect-of-view. sometimes or not it's helpful to examine consistency across the software: specifically from a GUI element-of-view. it's also first rate to find time for exploratory checking out. eventually, we want to make some area to comprise the comments now we have obtained from the company all over the new release.

    Therese Hansen favored one of the crucial questions which the speaker asked:

    one of the questions become "How XP are you?" and notably:

    can you declare to be a XP-crew...

  • if you don't use index cards?
  • if you don't write code check-first?
  • if you don't software in pairs?
  • in case you don't sit collectively?
  • if you wouldn't have an onsite client?
  • Carl Knibbs posted notes and diagrams from this speak.

    beyond Agile

    Willem van den Ende described this speak he gave with Marc Evers:

    Marc and that i introduced an additional generation of "past Agile - americans versus system" at qcon. This transcript became inspired via the re-carried out introduction. I plan to put in writing some extra quickly… We had a piece of writing in creation that we will rewrite based on closing weeks Agile Open France. The choreographies, the random order and the questions you noticed at the desirable of this post labored smartly, so we are going to do greater with that.

    A Kanban equipment for application Engineering

    Adam Shimali notion that this presentation became the most fulfilling talk at QCon and described it in element, beginning with:

    Like a lot of agile things, to get started all you need is a white board and put up-its. besides the fact that children the speaker

    David Anderson, become anxious to dispel the delusion that Kanban become really the rest to do with whiteboards and publish-its. These are enabling "technologies" and they additionally assist create the foundation for transparency as smartly. youngsters the genuine challenge is:

        "How a great deal work is at present in growth?"

    i'll come again to this factor, but practically "work in growth" is what Kanban is all about.

    Measure for Measure

    Steve Freeman had several strategies about this presentation, including:

    the day gone by, right through the XpDay Sampler song at QCon, Keith Braithwaite introduced the latest version of his talk on measuring the features of check-pushed code. Very briefly, many natural phenomena observe an influence legislation distribution (examine the slides for greater rationalization), in spoken language here's always known as Zipf's legislations. Keith found that tracking the number of strategies in a code base for each and every level of cyclomatic complexity seems like such a power law distribution the place the code has comprehensive unit checks, and in observe all the conforming examples have been written test-First; have confidence a physicist to word this. This matters because low-complexity methods comprise many fewer error.

    building smart home windows purposes

    Jan Balje mentioned this speak:

    Daniel Moth proven some entertaining new features of visible Studio. He did this at such a checklist speed that, to be aware it, the public will have to down load the videos from his weblog and play them at half velocity. still, it be nice to look what can be accomplished at the moment.

    building prosperous web purposes

    Mike Taulty has posted the total contents of his presentation on his weblog.

    windows as an internet Platform

    Jan Balje had some comments:

    Mister Nelson is a really driven spreaker who keeps entertaining (and humorous) contact with his audience, who doesn't are trying to display more than is in reality entertaining at that second, and who could make his story up as he goed along (which proves that he is aware of what he is speaking about).

    Panel: When is Rails an acceptable option?

    Siva Jagadeesan described this panel's discussions:

    The dialogue for some motive became completely off subject matter. likely the dialogue about what forms of venture may also be implemented using rails came about like 5% of time. lots of the discussion become about why no person from ruby neighborhood become thinking about ruby working so gradual in home windows. a person from viewers mentioned if Ruby neighborhood needs ruby to develop into mainstream and accepted as a language by means of all enterprises, it will run sooner in windows. Panel contributors observed that they don't basically care that an awful lot about ruby getting accepted in enterprises. They told that they are doing it as a result of Ruby as a language makes easy for them to resolve the problems.

    I totally accept that. If I find a language it's assisting me to resolve an issue greater eloquently, than i will use that language. I don't care no matter if that language might be accredited by means of all massive organizations or no longer. If there's somebody wise in those corporations, than s/he will decide what language is first rate for fixing their specific problem.

    Peter Pilgrim additionally had a summary of this discussion:

    it is difficulty of have faith and confusion. Does Rails scale over the commercial enterprise? Admittedly the panel agreed. They advised asking the query back, how a lot performance do you need? Ruby is one or two orders of magnitude slower than Java. There are however VM coming out in a ways as efficiency is involved.

    really no technical options here other than the obtrusive. This dialogue descending into how will we market Ruby to agencies? One idea they gave is to be subversive. as an instance Boost in checking out, automate builds. Introduce it as programs administrator device, in order that it is barely used internally. neatly Groovy can do this in addition to scripting device.

    Mark Edgington described this talk:

    an extra wonderful speak during which Kent provided his latest views on how he thinks complications should be solved from the design element of view. He started via following on from his keynote, pushing that we ought to design with individuals in intellect; design for the expertise of your availoble developers.

    Intentions & Interfaces - Making Patterns Concrete

    Udi Dahan had some concepts on his talk:

    From the remarks I heard after the speak, I feel many individuals had been shocked how many different parts of a equipment can also be designed this manner, and the way bendy it's devoid of making the code any more complicated. The message was this:

        Make Roles explicit

    despite its simplicity, that ends up in IEntity, IValidator the place T : IEntity, (which I wrote a couple of yr ago -

    generic validation) and with a bit of provider Locator capabilities, that you may add a line of code to your infrastructure on the way to validate all entities earlier than they're sent from the customer to the server. A story of Two programs

    Simon Brown had some innovations about this speak:

    The next session I attended changed into known as "A tale of Two techniques", which in fact offered a picture of what happens if you do and do not design your software. any one experienced in utility construction might not have considered any surprises right here, however it became quality to look the good and the unhealthy contrasted in a extremely down-to-earth means. There become a particular agile spin of all of this; with talk of flat team constructions and a distribution of the design accountability all through the group. truly, Pete mentioned that "he'd certainly not worked on a mission that mandatory an architect". while these techniques work smartly for small and/or simple projects, i'm nevertheless of the opinion that *some* architecture has to be performed up-front and that somebody must take most desirable accountability.

    Peter Pilgrim wrote up an in depth summary of this talk, together with:

    good Design ends up in stronger code, better group and success. Design matters: it will probably go spectacularly wrong, or can go right. despite the fact good task administration is primary. One has to make decisions on the correct time. Punting off complex selections and use-situations until one basically has time and the necessity to carry them to fruition is a really decent thought. (I consider he supposed on extra reflection that we may still store advanced selections in strategy except that you can get "consider" time as hostile to making the wrong determination in "doing" time.) good design comes from not being fearful of changing design. respectable design also is derived from healthy working relationship.

    user Interfaces: assembly the problem of Simplicity

    Phil Wills agreed with this presentation:

    In proof both of my astounding prescience, or complete lack of normal perception, presently after i might made my

    old put up I attended a brilliant speak by means of Giles Colborne at QCon on simlicity in person interfaces the place he expressed the change between the likes of me and  the immense majority, who do not respect that Vim is the most efficient method to edit textual content, via saying that most people are greater drawn to getting from A to B without crashing, than in doing so correctly.  now not sure that he realised how literal some of us are in our favouring the chance of crashing.

    Mark Edgington recounted the main features of this talk:

    an easy adventure to place across some instructions to help in designing person interfaces. The speak lacked somewhat od depth for me, in that probably the most observations felt a bit personal as opposed to having mucg evidence to again them up. It was what i needed although to permit me to think about the previuos talk. The guidelines:

  • keep in mind the context
  • just simple adequate ( cut back, embody and conceal)
  • Organise
  • don't make the consumer wait
  • verify
  • sure all a little ordinary and obtrusive, but that is what simplicity is all about; the simple things that get left out.

    Simon Brown additionally had some suggestions on this speak:

    Following the talk about application design turned into a chat about user interface design, entitled "user Interfaces: assembly the problem of simplicity". This session looked on the paintings of designing person interfaces so that they seem essential to the consumer, and that how making even the smallest of alterations can have a big effect. probably the most unique parts of this session become that it nearly absolutely paralleled the session that preceded it; in terms of speakme about agile construction, remarks, simplicity, you aren't going to need it (YAGNI), and many others.

    effective Design

    Filippo Diotalevi had some ideas on the track as an entire:

    one other amazing song. people from eBay, BBC, MySpace explaining the inner bits of their architectures, their disasters and their successes; it really is a kind of presentation that may still never leave out in a convention. Btw, do you know that MySpaces is operating on a .web stack?

    eBay's Architectural ideas

    there have been many attendees who commented on this presentation, reminiscent of Jan Balje:

    The day all started off with Randy Shoup talking concerning the architecture behind eBay. This changed into in reality architecture on the optimum level. The amount of information/transactions/servers and so on that ebay has is big. An superb talk, the slides are warmly informed.

    Nik Silver:

    his presentation turned into very obviously built to exhibit their principles of scalability, and a few concrete examples of how these work in follow. You likely would not use their periodic batch processing method to generate options — if simplest since it's odds on you wouldn't have a advice system — however you could take the overarching precept of "async all over" and apply that to the subsequent scalable utility that you simply deserve to work on.

    Stefan Norberg:

    Partition everything! Partition your equipment("functional cut up") and your information ("horizontal split"). It does not be counted what device or know-how you employ. if you can't cut up it you cannot scale it. elementary as that. Regardless if you're the use of a elaborate grid answer or simply distinctive databases.

    Use asynchronous processing far and wide! if in case you have synchronous coupled systems they scale collectively and fail collectively. The least scalable device will restrict scalability and the least obtainable equipment will limit your uptime. if you use asynchronous, decoupled, methods then the equipment can scale independently of each other.

    Danilo Sato:

    I had already examine eBay's transactionless vogue for reaching availability and scalability via information partitioning, nevertheless it turned into unique to listen to about the approach they strategy deployment for brand new code and lines. There are not any adjustments that can not be undone. they have automated deployment equipment that control the dependencies between distinctive accessories (a la kit management systems akin to apt) that enables rollout ant rollbacks (a la Rails' migrations) of different items of code. entertaining stuff!

    Simon Brown:

    Randy Shoup talked in the course of the key ideas, which might be :

  • Partition every thing
  • Async in every single place
  • Automate everything
  • be aware every thing fails
  • I've said this earlier than about one of the vital different classes, however I basically love it once we get to appear in the back of the scenes at what different americans are doing, specifically if you see that every system has it be personal set of alternate-offs and compromises.

    Steven Mileham:

    a extremely interesting analyze how they design a versatile structure that makes it possible for for his or her techniques to scale with the traffic going to the eBay site, and nevertheless enable them to roll out new code releases ever couple of weeks.[...]The leading enabler of this structure is their dedication to retain it as stateless as possible. The only time they use a session is the manner wherein a consumer creates an auction on the web page through a multi-page wizard trend interface.

    And Peter Pilgrim:

    resource Markdown. They are looking to detect failure as a immediately as viable. They monitor applications at all times, there is a swish degradation of the failing resource in such that it receives marked down. The application stops making calls to that aid, and there work is deferred to queues. vital functionality will fail. First they try to name it time and again for a collection time. 2nd if the resource remains accessible, then work put off to an asynchronous adventure.

    express "markup" allows useful resource to be aid and brought on-line in a managed means. They manipulate the client nonetheless attempting to connect with the useful resource.

    structure within the Media creation Workflow

    Many attendees mentioned this presentation, together with Mark Edgington:

    It become pleasing to listen to in regards to the problems the BBC has in determining the region of requests with a view to both serve advertisements and observe DRM. We are inclined to forget that the BBC gets a near set sum of money with which to work, so spending money serving content material outside the uk for nothing can be a pricey business. also giving away content material which is regularly under license agreements would additionally cause criminal issues. i used to be involved to gain knowledge of that the commercial is approaching line now, as a result of the overseas office charging there policy of funding the BBC to convey backyard the uk.

    Simon Brown:

    The subsequent session I attended become in regards to the BBC web site, primarily from the standpoint of what the consumer sees. The audio system had literally been drafted within the day earlier than and whereas I preferred their precise presentation, i used to be left wanting more guidance concerning the structure behind the web site. They did go into some particulars about what number of servers they'd, and so on but now not a lot on applied sciences and the like. Hats off for pulling anything collectively so instantly notwithstanding!

    Danilo Sato:

    Nothing in fact ground breaking in terms of expertise, however turned into exciting to hear about their present process of migrating an incredible genuine media storage (with guys in motorbikes taking tapes from website to site) to digital layout, and how it alterations their editorial system… somehow the graphic of the man in a bike jogged my memory of the Pigeon's high bandwidth switch protocol :-)

    And Tim Anderson:

    they're speakme about video on bbc.co.uk. in the past this has been handled through pop-up pages that provide a choice between home windows Media player and genuine Media. The BBC will now be standardising on Adobe Flash video, embedded in the page in place of in a pop-up. Their analysis has discovered that embedded video has a more robust click on-through than the pop-up trend. It also has editorial implications, because it is more suitable integrated into the web page. In due route, Flash can be the only real public structure (an archive is additionally saved in some other layout).

    There is going to be increasing video on the web site. interestingly the BBC is getting better at negotiating rights to video content, and we are able to are expecting a lot of video from this 12 months's Olympics, as an example.

    Anderson additionally mentioned the BBC's plan to rebuild it be net platform:

    curiously the finances has just been approved, which capacity the BBC can be going ahead with a new content platform constructed on Java supplemented by means of a light-weight Hypertext Preprocessor layer. The primary intention is flexibility. lately the BBC went reside with a brand new

    widgety home page which demonstrates its hobby in personalization; ambitions consist of more extensive customization, greater of a social platform (maybe the use of OpenSocial, OpenID); making a platform greater amenable to mash-ups; information-handiest APIs. As an aside, the BBC domestic web page at the moment is just a little broken; it says "due to technical issues we're exhibiting a simplified edition of the BBC homepage." After the day past's session, i know a little bit about why this is. The BBC's latest web site is mainly in response to Perl scripts and static pages. it be no longer really a content material administration gadget. The fresh home web page improvements, which I blogged about lately, don't seem to be hosted on the brand new platform, however are a a bit of hacky affair built on the historical platform the usage of SSI and parsing cookies with common expressions. It went live, but is currently not very respectable. It additionally makes use of extra CPU, which sooner or later capability greater servers are necessary.

    Peter Pilgrim posted a detailed summary of the speak including a roadmap:

  • more streamless integration with iPlayer
  • extra mobile
  • more searchable media
  • more integarated native content material
  • more activity with appropriate
  • more Widgets and Syndication
  • extra advertising
  • jokingly greater work and less break with the run into the Olympic games 2012
  • Nik Silver noticed this presentation as part of a larger theme of "No magic, no silver bullets, but numerous solid assistance and experience":

    All of this changed into summed up very properly by way of the group from BBC information:

    John O'Donovan, Kevin Hinde and Ross Heritage. They had been asked how they managed performance trying out for the iPlayer. John spent just a few moments describing some of the strategies they employed, however bought to the element when he realised the viewers really desired some eye-opening enlightenment which he did not have. At this second Kevin stepped forward and mentioned straight out "there isn't any secret sauce". certainly not: they simply work difficult and persist with robust principles. at the back of the Scenes at MySpace.com

    Dionysios G. Synodinos praised this speak:

    great walk during the a variety of administrative tool that the crew that handles Myspace.com have build on good of the .net platform, to video display a device that serves a whole lot of clients.

    Market possibility device @ BNP Paribas

    Mark Edgington had some notes on this speak:

    by outlining clearly the problem space and complications confronted by IT departments in the banking world;procurement and strategic sign-off and procurement. You bought a pretty good consider for a way the architecture got here collectively. during this case i felt that the open supply selections, many made due to restrictions, lead subsequently to success and what i might predict to be a contented building team. probably essentially the most awesome part of the architecture the place a set of approaches operating from Java main; it appeared to have come about as software servers where the remit of a further group, and asking them for involvement become now not an choice.

    exterior Textual DSLs Made basic

    Ola Bini commented that this presentation was "tremendously informative and something that i could keep in mind if I see something that might be benefit from it. The strategy is actually not for all issue domains, of route."

    Steven Mileham mentioned the brand new interview format which turned into confirmed out at QCon London:

    InfoQ, the organisers of the convention constantly host recorded interviews with business shapers on their website. For this conference they invited an audience in to participate in the interviews. I watched an excellent interview with Mark Little, a developer for Redhat who has labored on many of the present internet carrier requisites. He spoke about transactional web features, chiefly WSTX's two models acid transactions and company exercise transactions. For a SOA atmosphere, BA transactions should still be used, youngsters this simply capacity offering compensation methods for each and every carrier. He talked in regards to the tremendous divide between cleaning soap net functions and RESTful services, how he desires they might simply "kiss and make up". at last he mentioned the JBoss Redhat merger last year, evaluating JBoss to a teenage son to Redhat's forty yr historical father.

    a couple of individuals wrote about the social events, reminiscent of Libor Soucek:

    within the bar I actually have ultimately take an opportunity to speak personally to high profile americans like Steve Vinoski and Jim Webber which bolgs I read continually already long term. i was notably interested in getting their very own opinion on use of rest/ATOM in high performance methods as they don't seem to be always addressing that in their write-united statesdisplays.

    Jim Webber changed into somewhat open and admitted that his techniques are above all relevant to programs the place latency is commonly 1second and extra. This appears reasonable to me. truly sizeable majority of enterprise applications can healthy into this class the place leading examples are ERP systems and like.

    Steve Vinoski advised that for such case one shall likely comply with rest mannequin conceptually if no longer at once by means of general HTTP edition due efficiency constrains. it's actually viable however I actually have fairly mighty doubt is functional right here. Does any person understand such a success utility during this box to confirm Steve's advice?

    Therese Hansen:

    one of the vital surest things about going to QCon is for you to meet all the mind-blowing speakers in a very informal atmosphere. last nighttime i used to be having conversations with people like

    Joe Armstrong, Steve Vinoski, Jonathan Trevor and Kresten Krab Thorup within the hotel bar and that become excellent - I discovered an awful lot.

    And Ola Bini:

    Then there became the speakers dinner... lots of exciting discussions with lovely people. =)

    Opinions about QCon itself

    Erik Johnson pointed out:

    i'm on a plane getting back from the

    QCon 2008 convention in London. It became a good-notch experience and among the many great displays, two issues I learned stand out. the first changed into that i want wish to be trained Erlang. I spent a while with Erlang inventor Joe Armstrong, and had such respectable enjoyable that I've already downloaded the bits and acquired the publication. second, the rest reason has truly gelled and the proponents not see a necessity to argue their case – it's time to mature the story.

    Nik Silver pointed out:

    there were only a few moments for me all over

    QCon London 2008 of earth-shaking enlightenment — if any. however each hour of the three days of the convention there have been insights and guidance that may be tucked away, and reused later to shop hours, days or even weeks of time in different places. Snake-oil salesmen where skinny on the floor, and as an alternative there were dozens of people announcing one or each of:
  • this is what we did; and
  • here's what that you would be able to do.
  • No magic, no silver bullets, however a number of strong information and journey.

    other innovations:

  • Anders Sveen - QCon is on, and i'm not there. I had a blast there closing 12 months, so essential envy to all and sundry this is.
  • Matthew Ford - I've just spent the remaining week at QCon and i've essentially completely recovered (it become relatively intense). in view that there become only 1 Ruby tune i used to be a little involved that i would not locate most of the talks entertaining, youngsters this wasn't the case. the most wonderful talks had very little to do with Ruby.
  • Libor Soucek - The QCon is no doubt desirable ranked conference and first one which I visited thanks to my corporation. i was very anxious to peer what such convention is like and that i must admit it didn't disappoint me in any respect even I even have been part of it best during Wednesday.
  • Ola Bini - I had a good time and that i seem to be ahead to being back the subsequent time. i will in fact suggest QCon as one of the vital optimal conferences around in this industry.
  • Steve Vinoski - I just lower back home from QCon London, and its excellence surpassed my expectations. As average, the great of audio system QCon attracts (similar to JAOO) is dazzling, and they cover a really broad range of themes.
  • Dionysios G. Synodinos - My impressions about the corporation of the adventure are superb. The facilities were more than ample, the agenda was purposeful and labored out best, and the first-class of the presentations was very high.
  • Danilo Sato - i was basically impressed with the fine of the conference, from tracks, to sessions, and speakers. QCon is likely one of the most fulfilling technical conferences I've participated and that i recommend it for anyone interested in enterprise utility building. i'm anticipating attending again subsequent 12 months.
  • Filippo Diotalevi - All in all, it changed into a very respectable conference. The stage of the shows turned into very high, and i notably loved the undeniable fact that there were a lot of speeches now not strictly involving Java… without doubt nothing towards this programming language ;-), however I consider a convention should be also a good chance to be taught whatever thing different from the average equipment and languages.
  • Antonio Goncalves - I only had two days at the convention and i need to say, QCon is different from what i am used to. The viewers appeared greater experienced (or older if you need) and the high-quality of the shows was truly excessive. or not it's now not only for techies and not only for Java too. There become several tracks like Agile, Ruby, Middleware, web...
  • Mark Edgington - in short fabulous. I've attended many larger conferences and i discovered the smaller dimension greater enabling for conversation, both with the speakers and convention attendees. I attended tutorials on Agile administration and DSL's (area selected Languages) and adopted tracks on cloud computing, positive design and architectures. each of these had a superb set of speakers and there become only one session in the complete week that I felt became weak. I left the conference armed with lots of ideas and idea and a handful of impressive contacts.
  • O'Reilly GMT - Over the remaining three days, O'Reilly had been working a ebook stand at QCon in the Queen Elizabeth conference Centre in London. while we haven't been capable of get into any of the displays ourselves, observe is that this has been a ravishing conference, both stimulating and friendly, and or not it's actually a pleasure to be right here.
  • Simon Brown - i was talking to a couple of individuals in regards to the conference and their journey become the same as mine - Thursday was the top-rated day and there were a few time slots the place I hope I could have cut up myself into two. universal it was another superb adventure and that i incredibly recommend it for anybody pondering attending next yr.
  • Takeaway aspects

    Jan Balje referred to:

    So, what can we make of all the counsel that changed into poured over us the closing days? what is the most crucial? Of direction, we are able to deserve to investigate all these things further. but originally outlook, i might say: 

  • relaxation appears like a crucial new fashion.
  • Erlang could reply the want for more Concurrent Oriented programming languages.
  • Java for enterprise functions is awfully a lot alive, also for true time programs.
  • Peter Bakker had a protracted record, including:

  • Stateless Architectures push the "state" problem to the database, the vogue is to reclaim the state within the utility server and services, and put state close to the user
  • To make definitely scalable options: divide, cut up, partition, work asynchronously, no state
  • first construct something basic, then suppose of all the "...ilities"
  • the accountability of software additionally holds for biological food: constructive, reliable, low-budget. evaluate bloathed utility to industrial meals: unneccessary facets are like unneccessary additives.
  • Mark Little linked a thought that came to intellect:

    i wished to mention whatever that came up there but which has been playing on my mind for ages anyway: the art of eye-catching code and refactoring. I heard a few americans saying that you simply mustn't touch a programming language if you can't (without problems) refactor applications written the usage of it. I've heard identical arguments earlier than, which comes again to the IDEs obtainable. i might at all times taken this as extra of a personal preference than any type of simple law, and perhaps that (very own preference) is what number of people suggest it. besides the fact that children, listening to some at QCon it's beginning to border on the latter, which in fact started me considering.

    possibly it be just me, however I've not ever consciously factored within the query "am i able to refactor my code?" when settling on a language for a particular problem.

    Markus Voelter posed some questions about practical programming and concurrency:

  • if i exploit a nice, probably sideeffect-free useful language (say: F#), what do I do with all the libraries (right here: .internet) that aren't purposeful?
  • which parts of my device should I write in a practical language for first rate concurrency assist, and where may still I not do this?
  • How a good deal concurrency do I tackle on platform/infrastructure-level (e.g. methods, EJBs, and so forth.) and how a good deal do I deal with on the language degree? Which granularity is effective for which assignment?
  • also: Assuming the platform offers a concurrency model, what can the language do to be certain I cannot (or i'm discouraged from) interfering with the platform's concurrency model?
  • So, useful and concurrency specialists on earth, please unite! and write a bunch of (context,issue,solution,tradeoff)-tuples (often known as Patterns) and present them at a future JAOO or QCon conference.

    Cleve Gibbon contemplated how software construction has modified:

    Rebecca became spot on when she cited that tools similar to yacc/lex and to a lesser diploma antlr, have obtained dangerous press as being archaic, blunt tools with magical powers which are wielded by way of the chosen few. really, there hasn't been an awful lot trigger for the loads to use them. Will the pressure for exterior DSLs where you wish to create your personal language make them greater universal? I doubt it. I consider people will nonetheless select internal DSLs which are written well-nigh in the host language (e.g. rSpec, JMock, etc).

    but I must comprehend now that those guys/gals born within the eighties and heaven forbid the nineties, are operating off a very different programming stack. Their minds are in distinctive areas and their toolset is a bit orthogonal to mine.

    Mark Edgington described the week after returning to the office from QCon:

    dialog round cloud computing has been a large hit. I received some decent contacts and these have lead to investigation on the use of the Elastic computing and S3 features from amazon for one among our shoppers. recommendations from 'The Zen of Agile administration' have allowed me to view our Agile and Prince 2 approaches in a brand new mild; I expect my observations to work round to discussion and change within the coming weeks. additionally the area selected Language competencies has invigorated conversation around framework and language selection on initiatives. All in all a pretty good week.

    Simon Brown questioned even if UML is losing popularity:

    So then, is UML on the way out? i would be attracted to your concepts on right here.

  • What notation do you employ to your structure and design diagrams?
  • Is a standard diagramming notation crucial to you?
  • How does your viewers influence how you create diagrams?
  • in case you do use UML, what's your UML tool of option?
  • Video

    This year at QCon, a brand new scan became tried out - a video weblog referred to as are living@QCon:

    Adblock

    Podcast

    Coding the structure has created a podcast discussing QCon London:

    As promised the 2nd CTA podcast is a roundtable discussion between probably the most CTA contributors - specifically Simon Brown, Sam Dalton and Kevin Seal. during this podcast we discuss some of the syllabus emerging from the exact QCon convention held in London and our views on those themes. Conclusion

    QCon London become a great success and we are very proud to have been capable of offer this kind of conference. it is going to proceed to be an annual event in both London and San Francisco, with the subsequent QCon being across the equal time next yr in each area. We additionally seem ahead to bringing QCon into different areas which InfoQ serves, akin to China and Japan. Thanks all and sundry for coming and we'll see you next yr!!!!




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