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From "Ioannis Canellos (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KARAF-823) Add DOSGi support for Cellar
Date Thu, 25 Aug 2011 06:54:31 GMT

    [ https://issues.apache.org/jira/browse/KARAF-823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13090824#comment-13090824
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Ioannis Canellos commented on KARAF-823:
----------------------------------------

Please let me share what I had in mind. By dosgi I am referring to remote services (as described
in the osgi compendium chapter 13) and not to a specific implementation (e.g. cxf dosgi).

Since cellar already provides a) a node discovery mechanism b) means to dispatch events, commands
to remote nodes and c) distributed memory (which can be used as a remote service registry),
I was thinking to implement the specification (or at least a part of it) on top of cellar.
 

I also have thought about using an existing implementation like cxf-dosgi, and r-osgi, but
I think that they don't fit well because simply they are build from scratch (from discovery
mechanism to transport layer etc). 

Regarding the implementation, what I had in mind is to implement a service listener that will
create a queue (hazelcast queue) for each interface of the exported service. A ListenerHook
that will register a proxy for each imported service (service that is not found locally but
is found remotely). And the actual proxy that will dispatch remote service call commands (cellar
commands) to the appropriate queue. The rest are already provided by celllar. 

I have implemented the above and also some samples and I am currently testing it. So far it
seems to be working fine, it requires no configuration (only a property to mark a service
as remote), it automatically scales (if you add more nodes that export the service it automatically
load balances the load etc) and does not introduces any other dependency.

I was thinking to commit it to trunk by the end of the week. wdyt? 

> Add DOSGi support for Cellar
> ----------------------------
>
>                 Key: KARAF-823
>                 URL: https://issues.apache.org/jira/browse/KARAF-823
>             Project: Karaf
>          Issue Type: New Feature
>          Components: cellar-core
>            Reporter: Ioannis Canellos
>            Assignee: Ioannis Canellos
>             Fix For: cellar-3.0.0
>
>
> It would be nice to have the ability to have distributed services on top of cellar.

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