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From David Blevins <>
Subject Re: failover demo in sandbox
Date Wed, 03 Feb 2010 10:23:20 GMT

On Feb 3, 2010, at 9:57 AM, Shawn Jiang wrote:

> There are some discussions before that we should use WADI instead of  
> discoveryAgent to track cluster nodes.
> I would like to give it a try instead of implementing another  
> discovery agent.

A WADI implementation of the DiscoveryAgent interface might work.  If  
it is able to keep a server list and notify people when items are  
added and removed, then it would work fine.

If you mean to remove the DiscoveryAgent abstraction and rewrite the  
related Geronimo and OpenEJB code that uses it, then that is something  
we'd probably want to avoid.  Would probably be better to "fix" the  
abstraction if there was something wrong with it.  It is pretty simple  
though.  Whoever maintains the big list of all services simply needs  
to call the DiscoveryListener's "add" or "remove" methods so that  
parts of the system who are interested can act accordingly.


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