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Date: Thu, 27 May 2010 05:41:36 -0400 (EDT)
From: "Charith Dhanushka Wickramarachchi (JIRA)" <jira@apache.org>
To: dev@synapse.apache.org
Subject: [jira] Updated: (SYNAPSE-618) [GSoC] Implement a Dead Letter
 Channel for Synapse
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     [ https://issues.apache.org/jira/browse/SYNAPSE-618?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Charith Dhanushka Wickramarachchi updated SYNAPSE-618:
------------------------------------------------------

    Attachment: synapse_sample_1.xml
                messagestore_patch_1.diff

This is the 1st patch for the Dead letter channel EIP implementation.

This adds a in memory message store with a simple redelivery processor.
Message store is currently associated with endpoints.

This implemention will be improved with time as discussed in

http://wiki.apache.org/general/charith/gsoc2010/synapse_deadLetter

http://markmail.org/message/4lji7luz37k5xsv3?q=Synapse+Message+Store 

please review and commit

> [GSoC] Implement a Dead Letter Channel for Synapse
> --------------------------------------------------
>
>                 Key: SYNAPSE-618
>                 URL: https://issues.apache.org/jira/browse/SYNAPSE-618
>             Project: Synapse
>          Issue Type: New Feature
>          Components: Core, Endpoints
>            Reporter: Hiranya Jayathilaka
>            Assignee: Hiranya Jayathilaka
>             Fix For: FUTURE
>
>         Attachments: messagestore_patch_1.diff, synapse_sample_1.xml
>
>
> Currently when Synapse attempts to send a message and if it fails, following actions can be configured to deal with the error:
> * Execute a fault sequence and handle the failed request gracefully
> * Fail-over to a different endpoint
> In addition to these, Synapse ESB should support the "dead letter channel" enterprise integration pattern to deal with various errors that might occur during mediation or while sending. With the dead letter channel, the failed message will be put into a message store in the ESB. Later the ESB can retry to send the messages in the message store. 
> We should be able to have multiple implementations of the actual message store and should be able to configure which store to use for a particular scenario. Users should be able to implement their own message stores and plug into the ESB easily. To start with we can have a simple in-memory message store and a persisting store based on JDBC or JMS. 
> References:
> http://www.eaipatterns.com/DeadLetterChannel.html
> https://issues.apache.org/jira/browse/SYNAPSE-263
> Possible Mentors:
> Hiranya Jayathilaka

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