[Hibernate-devel] Re: JCS integration

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

Found 2 issues with the current cache code:

one with the <jcs-cache> tag, i edited vertex.hbm.xml to do my testing.

If i place the <jcs-cache> tag just after the <class> one it "works" , no
error while parsing the xml

If i place the <jcs-cache> tag after </subclass> and before </class> , got
an error parsing the xml:

Other error comes from the fact the class CacheEntry does not implement
Serializable, it's mandatory that class going to the cache are serializable.

quick fix : ClassPersister.java line 1035

 private final class CacheEntry implements Serializable {

Other observations:

Got 3 vertex in my app and when i enter the show command, got debug info:

134383 [main] DEBUG cache.ReadOnlyCache  - Caching: 0
134383 [main] DEBUG cache.ReadOnlyCache  - Caching: 1
134383 [main] DEBUG cache.ReadOnlyCache  - Caching: 2

- I thought the key was a composite one.... ( tableName + PK ), it appears
it's only the PK
( if we want to be able to share a region cache among multiple classes we
need a unique key)

- Then i try to re enter the show command, i would expect to get some "Cache
hit: xxx" debug info , but i get none.Are we sure that Hibernate does check
the cache properly ?

best regards
Christian Meunier

----- Original Message -----
From: <Gavin_King/Cirrus%CI...@ci...>
To: <hib...@li...>
Cc: <vc...@cl...>
Sent: Thursday, July 25, 2002 5:09 PM
Subject: JCS integration


> Christian Meunier got me started with some code to integrate Apache
> Tubine's JCS today. I ended up rewriting much of the Cache package and
> making some big improvements. Anyway, you may now specify a JCS cache in
> the mapping file using
>
>   <jcs-cache usage="read-only"/>
>
> or
>
>   <jcs-cache usage="read-write"/>
>
> You must then configure the cache in the resource /cache.ccf
>
> I will deprecate the old homegrown cache soon.
>
> JCS supports things like in-memory LRU caching, disk-caching, distributed
> caching, etc but be careful of using a distributed cache with usage
> ="read-write". That probably wont work.
>
> All in CVS....
>
>