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Axis2, middleware for next generation web services

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Axis2 ICWS 2006 Paper at Chicago

Axis2 ICWS 2006 Paper at Chicago

Published in: Technology, Education

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  • Transcript

    • 1. Axis2, Middleware for Next Generation Web Services Srinath Perera
    • 2. Next 20 Minutes
      • Why Axis2?
      • What does it have?
      • Architecture
      • Core Concepts
        • XML processing
        • Extensibility
        • Messaging
      • Conclusion
    • 3. Why Axis2?
      • Web Services has changed, so are the values and expectations from WS Middleware
        • Better support for Messaging, Asynchronous interactions
        • Performance, Need for better XML processing
        • Better support for WS-* specifications
        • New specs, and changes to specs
        • (Better or for worse)
    • 4. What does it have?
      • Better XML processing model
      • Powerful messaging support
      • Seamless integration with WS-* implementations – WS-Addressing, WS-Security, WS-RM ….
      • Archive based Deployment
      • Close integration with Policy
      • HTTP, TCP, SMTP and JMS transports
      • REST, MTOM, WS-Policy …
      • Pluggable data Binding
      • WSDL based Code Generation
    • 5. Architecture 10,000 foot view
    • 6. XML processing Model
      • Major decider of performance
      • Expectations
        • Better performance, Streaming access to the Soap Message
        • Move back and forth
        • Easy accesses to the Soap Message, in other words Tree like (DOM like) representation
    • 7. How to tackle XML Processing?
      • Use of XML streaming API
      • Virtual XML elements, that provide familiar interface to user
      • Underline implementation based on differed/lazy parsing (Data is read as late as possible)
      • Switching back to the pull parser
      • Use cases
        • Streaming at data binding
        • Pass result to another Web Service
        • (Workflows)
    • 8. Extensibility
      • Support for security, reliability, transactions, addressing ….
      • Axis1 approach, Handler architecture
    • 9. Need bit more than Handlers
      • Simpler deployment
      • Automatic configuration e.g. Security
      • What if two or more Handlers co-exists? E.g. Security and Reliable Messaging
      • Operation Injection - e.g. RM, WS-RF, WS-Sec Conversation
      • Managing Handlers automatically and transparently based on Policy
    • 10. Axis2 Modules for extensibility
      • Module = Handler(s), + ordering rules + Initialization logic + Operations
      • Archive based deployment, just copy it to Axis2 repository.
      • Available modules vs Engaged modules
      • WS-Policy based engagement and automatic configuration
      • Possibility of automatically adapting services with (dynamic/static) policy negotiation
    • 11. Messaging
      • Messaging System addresses three issues
        • Complex message groupings and correlation
        • Blocking-Non Blocking behavior of Client /Server API
        • Synchronous and Asynchronous behavior of transports
      • Supports for following cases
        • Request response, non-blocking synchronous
        • Request response, non-blocking asynchronous
        • Request response, blocking synchronous
        • Request response, blocking asynchronous
        • One way
    • 12. Messaging in Axis2
      • Two Pipes, IN and OUT
      • Composing pipes at the Client (MEP clients) and Server (Message Receiver) to yield different MEPS
    • 13. Messaging (Continued)
      • Three Properties (non-blocking, MEP, Sync-Async) are Handled in Operation Clients and Message receivers
      • Switch between the different modes by simply setting client API parameters
      • If you are a Geek, you may even add new Operation clients/ Message Receivers
        • e.g. Pub-Sub use case
    • 14. Architecture (Revisited)
    • 15. Summery
      • We discussed rationale for Axis2, and brief looked at the architecture
      • We discuss three main topics, XML Processing, Extending SOAP Processing Model and Messaging
      • For more information
        • Official Site http://ws.apache.org/axis2/
        • http://www.wso2.net/projects/axis2/java
        • Mailing List
        • http://ws.apache.org/axis2/mail-lists.html