How does the durable subscription work behind the scenes?

scotthkao May 7, 2008 11:19 PM

I know that the JBossMQ message are stored first in the database. Does the underlying mechanism deal with durable subscription
1. by making a durable copy for each subscriber (n copies of the same messages) or
2. by making a last sent message index (n copies of last sent index) and a single copy of complete messages?

Thanks,
Scott

1. Re: How does the durable subscription work behind the scenes

adrian.brock May 16, 2008 1:09 PM (in response to scotthkao)

JBossMQ uses (1)

There was an attempt to try to retrofit (2) but it had bugs and nobody wanted to
work on it/fix it. Look for references JDBC3 PersistenceManager if you want to try to make it
work.
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