Thursday, June 4, 2009

JavaOne 2009: Enterprise Application Integration Patterns

Andreas Egloff (Sun) and Bruce Snyder (SpringSource)
Enterprise Integration Patterns in Practice
"A Design Pattern is a formal way to document a solution to a design problem ina particular field of expertise" - from Wikipedia

  • The presentation is based on the "enterprise integration patterns" book

  • Stencils for Visual Studio in EAI Patterns web site

  • Flexibility x Productivity: too little explicit support out-of-the-box but explicit support out-of-the-box is too rigid (does not fit your case or you are forced to go around) - the solution would be to extend those use cases

  • Frameworks: Apache Camel and Project Fuji (from OpenESB v3)

  • Camel supports routing of messages in a simple manner like, for instance, from("A").to("B") and much more complex stuff like taking decisions in the route and where to route the message to; it also suppors a pipeline routing much like from("file://myfile.txt").choice().when().method("MyBean","matches").to("Q").end().pipeline("B","C","D")

  • Some Camel components: Atom, Bean, SEDA, SFTP, HTTP, FTP, Mock, XQuery, XSLT and much more (70+)

  • Project Fuji is the basis for OpenESB v3 and is a service platform to realize SOA based on Convention - Configuration - Code in that order; Light weight and OSGi based and not centred on JMS but on Services

  • The Project Fuji has a Web UI that allows the user to visually declare and configure services and program the connections and routing of services; it also offers a DSL (Integration Flow Language)

  • Bruce and Andreas went on some slides with examples of the patterns from EAI book and showed how those are implemented in Camel calls using Fuji interface to build them - it seems easy, but as they said in the beginning of the presentation, using out-of-the-box solutions might be too rigid; on the good side, you can write code using DSL and even pure Java, so it really might be an interesting solution for integration

  • After the slides, a quick live demo using Eclipse with some tools for Spring and Maven with archetypes for Apache Camel

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