Sunday, October 08, 2006

[Event] JAOO Conference Day 1

The Technology Platform: Building Blocks for Innovation (Werner Vogels)

Werner explains how strong is build as platform on services and why their solutions was the only possible way to scale well. Scaling is fundamental for them because the basic block in their business model is growth. He also mentions that their SAO architecture is not based on a specific vendor or technology (as SOAP/ESB), they use every technology which helps to solve a specific problem. Small teams develop these services and they are full responsible for deployment and the life cycle of the service.

Abstractions for Concurrency (Erik Meijer)

Eric presents the concurrency concept of Comega which helps to solve a lot of nasty problems you have to solve with Monitor usage. Because Comega is a language extension to C#, there is also a library version of the concepts which is based on delegates and can be used in every CLR 2.0 language.

REA (Resources, Events, Agents) (Pavel Hruby)

Pavel explains how business processes can once more be modeled in a way in which the economy normally really works: Goods are resources which are constantly exchanged, if the exchange takes place a business event happens and someone is participant of this transfer.
So instead of to model domain models in the typical technical way as entities and business value methods they can also be modeled in a more reality aligned way.
He builds this concept for the framework which is used in Navision.

Concurrency and the Composition of Frameworks (Joe Duffy)

Joe shows some concepts how to encapsulate concurrency if you build up frameworks and how you can define an API which helps the user to discover what your intention really was and why and how he has to use your code in concurrent situations.

Seaside: A Radical Web Framework (Glenn Vanderburg)

Glenn presented Seaside as working Demo, which he was changing all along the talk. Seaside is based on Smalltalk and makes heavy usage of continuations, so problems like the nasty state transfer if the user use the back button in the browser or “forks” the web page flow with opening a new window could be simply solved. Because it is Smalltalk, you can change the code rather easily on the fly so this talk was a real life demo. The downside is, that Seaside continuations are not serializable, so this can be a great obstacle if you want to scale your web site.

Conversations between Loosely Coupled Services (Gregor Hohpe)

Gregor presents some of his patterns which he is collecting for his new book about patterns for service oriented architectures. Most of the patterns are best practice for complex and simple conversation style between services.

SOA What's left to say? (Steve Vinoski & Gregor Hohpe & Beat Schwegler & Ivo Totev)

The panel discuss what is open for SOA and basically it should be now time to implement architectures based on services and never forget that the implementation is driven by business and not the other way round.

Methodologists are Blue-Green Algae and Methodologies as Swimsuits (Alistair Cockburn)

Alistair explains the audience why methodologists are a very low life form but which is useful because they can transform flawed systems (algae also consume CO2 and produce O, very useful for us). On the other side, methodologies have all different size and shape, so there is no “one fits it all”. His metaphor for this are swimsuits, because if they are used by divers, they have to be really heavy and if they used by girls, well, they can be very lean ...

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