Re: [Hibernate] JCS cache - Distributable read-write

[Christian M. <vc...@cl...>]

Little more thought on this subject ;)

Like i said in a previous mail, i understand fully now what Gavin is doing
(and why he is doing it) with the ReadWriteCache implementation.

However i believe such implementation which is 100% safe got some tradeoff
( each method are synchronized ), i am under the impression (Wrong ?) that
for a web based application (only pretty short transaction / if a tx begin
at t0 it will end before a tx that started at t1)  that do not manage
sensitive information like banking records  such security level is a bit
overkill.

It could be usefull in such case to be able to use a lightweight version of
the ReadWriteCache that does not need to synchronize each of its method. It
will ensure the best performance and can be distributed with a jcs lateral
caching.

I am think about this:

(1) Coarse grained approach : configure hibernate to use a custom
CacheConcurrencyStrategy for every cached class:

Something like this in the hibernate properties:

hibernate.jcs_cache.read_only_concurrency_strategy
cirrus.hibernate.cache.ReadOnlyCache
hibernate.jcs_cache.read_write_concurrency_strategy
cirrus.hibernate.cache.ReadWriteCache

(2) Fine grained approach : enhance the <jcs-cache> to support a
concurrency-strategy attribute:

Something like this in the metadata info:

<class name="eg.Foo">
      ....
     <jcs-cache usage="read-write"
concurrency-strategy="cirrus.hibernate.cache.ReadWriteCache"/>
</class>


What do you think about this ?

Regards
Chris