Re: [eclipselink-users] Eclipselink, cache coordination

[James Sutherland <jamesssss@xxxxxxxxx>]

To use a SessionCustomizer you need to set it in your persistence.xml,
i.e.
"eclipselink.session.customizer"="org.acme.MySessionCustomizer"

It will be called with the EclipseLink Session before login.



chb75 wrote:
> 
> Hi,
> 
> sorry for my short post, i was a little frustrated after two days of
> search. Main problem was the JNDI setup.
> I have read a lot and things are getting a little clearer.
> 
> I had a whole list of issues:
>  - getting openmq to work (easy/out of the box)
>  - why do i need a jndi lookup (kind of works with RefFSContextFactory,
> but still don't know why that's necessary) - i thought that telling
> eclipselink where to find the jms-broker should be enough - maybe someone
> can comment on this?
>  - setting up jpa (... took a while)
> 
> Most of it is taken from
> http://www.nabble.com/Experiments-with-Glassfish-and-coordinated-caching-tt16356582.html
> 
> 
>      protected EntityManagerFactory emf;
>      protected String resourceName;
> 
>      // ...
>      public EntityManagerFactory getEMF (){
> 
>         if (emf == null){
>             emf = Persistence.createEntityManagerFactory(resourceName);
>             Server session = JpaHelper.getServerSession(emf);
> 
>             RemoteCommandManager rcm = new
> RemoteCommandManager((CommandProcessor) session);
>             
>             Hashtable properties = new Hashtable(2);
>             properties.put(Context.PROVIDER_URL,"file:///tmp/jndi");
>            
> properties.put(Context.INITIAL_CONTEXT_FACTORY,"com.sun.jndi.fscontext.RefFSContextFactory");
>             
>             JMSTopicTransportManager tm = new
> JMSTopicTransportManager(rcm);
>             tm.setTopicHostUrl("tcp://localhost:7676");
>             tm.setLocalContextProperties(properties);
>             tm.setRemoteContextProperties(properties);
>             tm.setTopicName("HelloTopic");
>             tm.setTopicConnectionFactoryName("HelloConnectionFactory");
>             tm.setUserName("guest");
>             tm.setPassword("guest");
> 
>             rcm.setTransportManager(tm);
> 
>             ((DatabaseSession)session).setCommandManager(rcm);
> 
>             session.setShouldPropagateChanges(true);
> 
>             rcm.initialize(); 
>         }
>         return emf;
>     }
>      
> Annotation seem to work:
> @Cache(coordinationType=CacheCoordinationType.INVALIDATE_CHANGED_OBJECTS)
> public class ...
> 
> Oh yes, i threw the settings.xml out of the window.
> 
> So comments on why jndi (is there a way without?) would be nice.
> 
> I did read about the SessionCustomizer, only I don't know how to use it. I
> can see how I would write one, but how would EclipseLink know about this?
> 
> Lot's of thanks
> 
> Christoph
> 
> 
> 
> James Sutherland wrote:
>> 
>> How are you configuring cache coordination currently?  What issue are you
>> currently having?
>> 
>> You best option with JPA is to configure cache coordination using a
>> SessionCustomizer.  In your customizer you will need to set the
>> RemoteCommandManager for the session.  Here is an example for RMI, you
>> will need to change the transport manager to use JMS.
>> 
>>         RemoteCommandManager cm = new RemoteCommandManager(session);
>>        
>> cm.getTransportManager().setNamingServiceType(TransportManager.REGISTRY_NAMING_SERVICE);
>>         // set full rmi URL of local host 
>>         cm.setUrl("rmi://localhost:41099");
>>         // turn on cache sync with RCM
>>         session.setShouldPropagateChanges(true);
>> 
>> 
>> chb75 wrote:
>>> 
>>> Hello,
>>> 
>>> I'm trying to set up a system with hopefully few writes and lots of
>>> reads. I need to be able to scale, so cache coordination seems to be
>>> just the thing. Problem is, I cannot get it started.
>>> 
>>> I'm not using the workbench (started with toplink-essentials, jpa). 
>>> 
>>> I'm using a tomcat together with
>>> OpenMQ
>>> 
>>> Trying to configure everything through the settings.xml
>>> 
>>> Log messages suggest that the file is read. Looks ok to me.
>>> 
>>> 
>>> Can someone spot something fundamentelly wrong with this or point me to
>>> some relevant information because although reading the wiki and
>>> searching the net has helped I can't get it off the ground.
>>> 
>> 
>> 
> 
> 


-----
---
http://wiki.eclipse.org/User:James.sutherland.oracle.com James Sutherland 
http://www.eclipse.org/eclipselink/
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