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From "Gianny Damour (JIRA)" <>
Subject [jira] Created: (GERONIMO-2163) WADI Integration for Jetty
Date Sun, 02 Jul 2006 14:18:29 GMT
WADI Integration for Jetty

         Key: GERONIMO-2163
     Project: Geronimo
        Type: New Feature
    Security: public (Regular issues) 
  Components: Clustering  
    Reporter: Gianny Damour
 Assigned to: Gianny Damour 
    Priority: Minor
 Attachments: geronimo-wadi-integration-preview.patch

Email sent to the dev@ list.


I have been working on a second integration attempt of WADI and I am posting here a high-level
description of the current state of progress such that people can jump in.

At this stage, this is a Jetty only attempt and I do believe that the same approach can be
applied for Tomcat. The current integration provides (very unreliable) HttpSession state migration.
It only works for a single Web-application; more effort is required on the WADI side to support
multiple Web-applications and this will not impact the integration piece of code. I (more
or less successfully) tested the integration with mod_proxy + mod_proxy_balancer and mod_proxy
+ mod_rewrite in front of three Geronimo servers running the WADI demo web-app.

The code changes are:
* new module to capture some clustering contracts - geronimo-clustering: there Node, SessionManager,
Session and ClusteredInvocation are defined.
* new module to provide a WADI implementation of the above - geronimo-clustering-wadi;
* new module to capture clustering builder contracts - geronimo-clustering-builder: there
is only one interesting interface JettyClusteringBuilder. This later defines a couple of methods
to augment the environment of a Web module being built and add clustering specific GBeans;
* new module to provide a WADI implementation of the above - Geronimo-clustering-builder-wadi;
* geronimo-jetty-builder and geronimo-jetty are impacted to hook in clustering. These two
modules depend on geronimo-clustering and geronimo-clustering-builder and not on WADI specific

Two new modules are added:
* jetty-clustering- wadi: this module defines default WADI GBeans such as Dispatcher, ReplicationManagerFactory,
BackingStrategyFactory et cetera; and
* jetty-clustering-builder-wadi: this module defines a builder to process Jetty DD and add
various GBeans to the module being built.

I think that the implementation is flexible enough to plug in another clustering implementation
such as Kache.

As a matter of fact, there are some severe reliability (e.g. locking issues) and integration
(only one Web-app can be clustered) issues, which need to be fixed. So, this work is not yet
ready to be RTC voted. Having said that, I have opened a JIRA such that people can have a
look to the integration.


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