[jboss-dev] Re: Default jbosscache usage in JBoss AS 4.2/EJB3

[Max Rydahl Andersen]

btw. don't forget that it probably only should be done if the cache region  
haven't been set by the user...but I guess
that depends how you normally allow users to define/override deployment  
names.

/max

> Don't we do something like this for SFSBs already?  I don't remember the  
> code I wrote *blush*.
>
> Brian Stansberry wrote:
>> Forwarding to Carlo and Bill DeCoste.  The  
>> hibernate.cache_region.prefix would need to be derived from the  
>> deployment scope, probably the same algorithm used to create JMX  
>> ObjectNames for the deployment's beans. Want to keep the name fairly  
>> short, as it gets transmitted with every replication/invalidation  
>> message.
>>  Emmanuel Bernard wrote:
>>> Don't know who exactly, but definitely, Carlo should be aware of that.
>>>
>>> On 17 avr. 07, at 09:57, Max Rydahl Andersen wrote:
>>>
>>>> Hi guys,
>>>>
>>>> From various discussions I understand that JBoss AS 4.2 currently  
>>>> deploys a single JBC instance for use as a shared cache across EJB3  
>>>> deployments
>>>> and that individual EJB3 deployments will by default share the same  
>>>> cache resulting in them sharing the same cache regions.
>>>>
>>>> That is bad!
>>>>
>>>> Two independent applications should not share the same cache regions  
>>>> - they should *always* be seperated by setting  
>>>> hibernate.cache_region.prefix so
>>>> they only get access to the data that is actually relevant for them.
>>>>
>>>> There will also be classloading issues with such a scheme.
>>>>
>>>> From my understanding the place to fix this is in the ejb3 deployer  
>>>> to use whatever unique name these deployments have so the same  
>>>> cache_region.prefix
>>>> will be set correctly across different nodes etc.
>>>>
>>>> If the above assumption about 4.2 is correct, who is the right person  
>>>> to fix that ?
>>>>
>>>> ----
>>>> Max Rydahl Andersen
>>>> callto://max.rydahl.andersen
>>>>
>>>> Hibernate
>>>> max at hibernate.org
>>>> http://hibernate.org
>>>>
>>>> JBoss a division of Red Hat
>>>> max.andersen at jboss.com
>>>
>>
>



-- 
--
Max Rydahl Andersen
callto://max.rydahl.andersen

Hibernate
max at hibernate.org
http://hibernate.org

JBoss a division of Red Hat
max.andersen at jboss.com