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From Jean-Baptiste Onofré (JIRA) <j...@apache.org>
Subject [jira] [Commented] (KARAF-4685) Support session replication through OSGi 6 http whiteboard
Date Wed, 31 Aug 2016 12:18:20 GMT

    [ https://issues.apache.org/jira/browse/KARAF-4685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15452080#comment-15452080
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Jean-Baptiste Onofré commented on KARAF-4685:
---------------------------------------------

It sounds like a good idea, but the point is: how do you "inject" the listener in the web-app
? Just a service is not enough AFAIR.

> Support session replication through OSGi 6 http whiteboard
> ----------------------------------------------------------
>
>                 Key: KARAF-4685
>                 URL: https://issues.apache.org/jira/browse/KARAF-4685
>             Project: Karaf
>          Issue Type: Improvement
>          Components: cellar-http
>            Reporter: Roland Hauser
>            Assignee: Jean-Baptiste Onofré
>
> Currently, session replication can only be done through specifying the Hazelcast filter/listener
in the web.xml file of a web-application. This can be a serious disadvantage if you also want
to install a web-application to another web-container which does not need clustering, and,
consequently, does not contain the Hazelcast libs. In this case, the application won't start.
> I suggest an additional way how session replication could be realized without the need
of modifying the web-app: it could be done through a Cellar component which implements a http
whiteboard. I would realize this as follows:
> - Register a Filter/Session listener to the OSGi service registry. Per default, every
web-application installed is considered for session replication.
> - It should be possible to configure Hazelcast filter properties either through a config
file inside the OSGI-INF folder of the web-app, or, through the ConfigAdmin service.
> - If the sessions of a specific web-application should not be replicated, then this could
be flagged either through a config file inside the OSGI-INF folder of the web-app, or, through
the ConfigAdmin service.
> - The new Cellar component should be installable as additional feature "http-failover"
> What's your opinion?



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