Can I ask a dumb question:
Why?
Why - as in why the first-level cache in Hibernate is not pluggable ?
Then the answer is:
The first-level cache is a very specialized context that is very crucial
for Hibernate
to work. "first-level cache" is also generic term used to explain people
*one* of the
primary functions of the Session.
The first level cache in Hibernate is basically the Session (or more
precise the PersistenceContext)
and this "beast" is more than just a basic "cache" and even considering
having
this stuff in a cache such as ehcache, jbosscache etc. does not make sense.
For one thing it has to ensure session scope identity of objects and thus
these objects
are in no way "shareable" with others. Something that sets it apart from
what a normal
cache is actually used for.
I can very much recommend Chapter 5 (especially 5.3.2) in HiA about this
particular subject.
(In theory we could provide pluggability for the
Session/PersistenceContext but no
practical need have been presented...)
/max
-Andy
Max Rydahl Andersen wrote:
> Sounds good to me. My next question is how do we tell Hibernate to
use
> JBoss Cache as the first level cache?
*first* level cache ? Why would you ever want that ?
You mean second level cache, right ?
I mean first level cache, which by default is using ehcache-1.1.jar
(jira JBAS-2868). We don't include ehcache-1.1.jar with the 4.0.4 as
Again - Hibernate does not support pluggable first level cache; only
the
second level cache is pluggable. and yes ehcache is the default
*second* level
cache as currently that is the best available default singleprocess
cache.
Mannik is the one who has the details about the current state of having
JBossCache work as an efficient single process cache with hibernate.
/max
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Hibernate
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Hibernate
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JBoss Inc
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