I found some answers (after one long night and tons of coffee :-) )
- To declare the dependancy between SAR and PAR within the same ear file
in your jboss-service.xml (within the sar]
| server
| mbean code=com.bla.bla.MYService name=bla.bla:service=MYS
| dependsjboss.j2ee:service=EJB3,module=put your par file
here/depends
| /mbean
| /server
|
- To access the entity manager from MBean
First you need to advertise your entity manager factor
in your persistance.xml
| property name=jboss.entity.manager.jndi.name
value=java:/EntityManagers/myem/
| property name=jboss.entity.manager.factory.jndi.name
value=java:/EntityManagersFactory/myemFac/
|
In the service MBean , override startService(). lookup your entity manager
factory and call createEntityManger to get yourself an instance of the em I
created EXTENDED em and it worked for me
Why I am doing all of that... here is the problem I am trying to solve (if you
know better solution, please share it with all of us)
- I have to maintain a graph, the graph vertcies and the edges are persisted in
the db using EJB3 entity beans
- my clients (lots of concurrent ones), are travesing portions of the graph,
updating information in the graph
- The first solution was to use optimistic locks (@version) that killed me
as some portion of the graph was being updated by multiple clients at the same
time lots and lots of exceptions
- Second solution. In a ServiceMBean, I instantiated a JGraph, loaded all my
entities into the JGraph
- my clients can call methods of a SLSB that forward the call to the service
MBean
- In the MBean I am controlling the locking mechanism using semaphores per
vertex/Edge
Problems with my solution:
- In cluster deployment, how can I replicate my JGraph information??
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