[Ws Wiki] Update of "FrontPage/Axis2/SessionMgmtDesign" by RajithAttapattu

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The following page has been changed by RajithAttapattu:
http://wiki.apache.org/ws/FrontPage/Axis2/SessionMgmtDesign

New page:
Session Managment design

Main interfaces
---------------
 1. Session
 2. SessionManager
 3. SessionIdFactory
 4. SessionManagerFactory

These interfaces are located within the core package

Transient, Persistant and Replicated sessions
---------------------------------------------
The default implementations of these interfaces are done in the session package
It provides a basic transient session management implementation.

A Persistant and Replicated implementation is underway using WADI (http://wadi.codehaus.org)

Extracting and Inserting Session Id from the incoming and outgoing SOAP Message
-------------------------------------------------------------------------------
There will be 2 handlers that will intercept the incomming SOAP message to extract the session id.
If there is a outgoing message another handler will intercept the out flow to add the session id to the outgoing SOAP message.

Currently SessionHandler and EndOfRequestHandler, extracts and adds a WS-Addressing based reference parameter from the SOAP message.


How it plugs into Axis2
------------------------
The configuration is defined in the axis2.xml
This has the flexibility to define the SessionManager, SessionIdFactory and other attributes that control the session mgt behaviour.

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