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From "Ann Robinson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (AXIS2-1567) Need to save and restore the AXIS2 MessageContext
Date Mon, 06 Nov 2006 20:40:37 GMT
    [ http://issues.apache.org/jira/browse/AXIS2-1567?page=comments#action_12447528 ] 
            
Ann Robinson commented on AXIS2-1567:
-------------------------------------

Hi Rajith,

The current design/implementation of the MessageContext and the related context object graph
does not make it easy to persist the MessageContext.  The proposed implementation is the best
approach based on object-oriented design practices, trying to minimize what is saved/restored,
and facilitating the requirement for surviving server restart and reliable messaging.  Other
approaches for the implementation were considered but the disadvantages to those other approaches
outweighed their benefits.

There is value in being able to save/restore the AXIS2 MessageContext in progress, as opposed
to only saving the actual message and having to restart the message processing from the beginning.
  This is going to be more useful to WS-ReliableMessaging implementations that are composed
with a WS-Security implementation - this helps keep message-specific security information
together with the message.   

In the proposed solution, if AXIS2 handlers need to keep message-specific information with
the message, then the handlers should place that message-specific information in the properties
of the MessageContext, and make sure that those properties can be saved/restored.  For more
complicated message-specific information, the handler can implement an additional interface
which will allow the handler to control what it wants to save/restore when the MessageContext
is saved/restored.  Note that the additional interface is not required to be implemented by
a handler - it is only for a handler that has some complex message-specific information to
keep track of.  An example of  a handler that might have complex message-specific information
is a WS-Security handler.

Note that, in the proposed solution, the saving/restoring of a MessageContext requires an
explicit action - it is not automatically performed.  This means that the save/restore support
is available to components that use the AXIS2 kernel.  For those users who don't care about
Reliable Messaging, those users aren't affected - the MessageContext save/restore never happens.
  At the other end of the spectrum, there will be users who do care about Reliable Messaging
and who do want the guarantee of surviving a server crash/restart.   

The proposed solution provides a facility that can be used by such external components as
a WS-ReliableMessaging implementation but the proposed solution is not a replacement for a
WS-ReliableMessaging implementation.

Regards,
Ann

> Need to save and restore the AXIS2 MessageContext
> -------------------------------------------------
>
>                 Key: AXIS2-1567
>                 URL: http://issues.apache.org/jira/browse/AXIS2-1567
>             Project: Apache Axis 2.0 (Axis2)
>          Issue Type: New Feature
>          Components: kernel
>            Reporter: Ann Robinson
>         Attachments: patch.txt
>
>
> There is an AXIS2 requirement to save the message context at some point in the handler
chain, store it away, and restore it later.  This requirement also includes the need to let
handlers manage message-specific data when the message context is saved and restored.    
                           
> In particular, this feature can be used by a WS-ReliableMessaging implementation to persist
and re-send messages and to recover from a server restart. The idea being to save a message
context, then later restore the message context and pick up the message processing at the
point at which the message context was saved (that is, without having to completely restart
the message from the beginning).
> Refer to the wiki page
>     http://wiki.apache.org/ws/FrontPage/Axis2/MessageContextSaveRestore
> for a description of a proposal on how to accomplish this feature.

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