Add support for datasource failover

The change to org.jboss.resource.adapter.jdbc.local.LocalManagedConnectionFactory
is easier than org.jboss.resource.adapter.jdbc.xa.XAManagedConnectionFactory

In LocalManagedConnectionFactory add a property "delimiter"
which when present will parse the connectionURL into multiple urls.

In XAManagedConnectionFactory you will also need a property to identify which of the xaProps needs to be parsed for mulitple urls.
i.e. you need to identify which property contains the server to contact.

In both cases, if createManagedConnection fails for the first url, replace it with the second url, and try again until all urls are exhausted.

Of course, you can get clever and remember which urls are currently failing and try the non failing urls first, And also if the db is replicating, you might want it to "load balance"
connections across the urls?

Also, this design does not allow for using different properties with different db servers, e.g. user and password might change across the servers.

It also doesn't enforce that only connections from one connectionURL (db server) are in the pool at the same time in the event the db is not replicating.

If you are going to do this, I would suggest you subclass/replicate the managed connection factories and create separate rars so we can mark them as experimental.

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Adrian Brock
Director of Support
Back Office
JBoss Inc.
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