On Feb 8, 2004, at 23:49, Andrus Adamchik wrote:
> Ok, so with your setup the goal is to avoid "pollution" of DataDomains
> with the data from a different DB, and take advantage of the Level 2
> cache at the same time.
Yes!
> You probably don't care about Level 3 cache with a single instance per
> DB anyway.
No. Perhaps level 3 cache would be nice if we should use multiple JBoss
servers in the future.
> Good news is that it looks like 1.1 will just work as is. Having said
> that, here is your options:
Ah, perfect!
> 1. Use a unique DataDomain name for each deployed instance, and only
> use level 2 cache. To do renaming on deployment you can use cdeploy
> Ant task: http://objectstyle.org/cayenne/userguide/deploy/cdeploy.html
> . This is the cleanest approach IMO, and you can also combine it with
> your DataSource replacement logic.
>
> 2. Keep doing what you are doing now, just enable level 2 cache. I
> understand that "cayenne.jar" is bundled with each "*.war" file,
> instead of sitting in a shared location on the server, right? So it is
> loaded for each app via application ClassLoader, meaning that even
> though technically different instances are on the same VM, two
> applications would behave as if they were deployed on separate VMs.
> Nested ClassLoader magic...
Yes, cayenne.jar is bundled with each war-file. I know about the nested
ClassLoader stuff. So the cache in level 2 are bound to a static field?
Sounds perfect for our use :)
- Tore.
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