[hibernate-dev] hibernate-osgi JPA bootstrap & classloader
brmeyer at redhat.com
Wed May 27 22:09:35 EDT 2015
> Is that the best way to know when TransactionManagers and DataSources come
> and go too? Or is there a more specific concept for listening to an "OSGi
At least for TransactionManagers, yes, the BundleListener is probably the best approach. I'm not aware of a more specific way beyond that, but I'm not 100%. Honestly not sure about the DataSource -- can't remember if most containers automatically expose that or not.
> Also, do the containers generally handle "in-flight" requests in
> regards to TransactionManagers
> and DataSources on activated/deactivated? I guess this is more a
> curiosity, since I do not see what we could do if the container does not
> manage it.
Really good question, but not sure. The hope is that a truly OSGi-friendly bundle is "dynamic" enough to gracefully terminate in-progress actions if deactivated. They're given that opportunity through BundleActivator#stop. Of course, that's entirely up to the specific impl. I would expect Karaf container-provided defaults (Geronimo JTA, etc.) to handle that reasonably well for basic cases, but not sure about the real-world edge cases...
Note that I always hoped to make Hibernate fit that bill, but we're *far* from it. Deactivation would, in all likelihood, be catastrophic. And no idea about re-activation.
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