Number of Mbean instances in pool

saleti Nov 23, 2004 2:18 PM

Hi,

I am trying to setup the pool to mange number of message bean instances. Can you please me know how i can do it in jboss.

In Web logic it is done by adding the following to ejb-jar.xml
<message-driven-descriptor >

<max-beans-in-free-pool >100</max-beans-in-free-pool >
<initial-beans-in-free-pool >25</initial-beans-in-free-pool >

</message-driven-descriptor >

Thanks.

1. Re: Number of Mbean instances in pool

flindet Nov 23, 2004 5:06 PM (in response to saleti)

If you look into conf/standardjboss.xml, you'll find a section on message-driven-bean. In here you can set the MinimumSize and MaximumSize

Here's a snippet from my file:

<invoker-proxy-binding>
 <name>message-driven-bean</name>
 <invoker-mbean>default</invoker-mbean>
 <proxy-factory>org.jboss.ejb.plugins.jms.JMSContainerInvoker</proxy-factory>
 <proxy-factory-config>
 <JMSProviderAdapterJNDI>DefaultJMSProvider</JMSProviderAdapterJNDI>
 <ServerSessionPoolFactoryJNDI>StdJMSPool</ServerSessionPoolFactoryJNDI>
 <!-- WARN: Don't set this to zero until a bug in the pooled executor is fixed -->
 <MinimumSize>1</MinimumSize>
 <MaximumSize>15</MaximumSize>
 <KeepAliveMillis>30000</KeepAliveMillis>
 <MaxMessages>1</MaxMessages>
 <MDBConfig>
 <ReconnectIntervalSec>10</ReconnectIntervalSec>
 <DLQConfig>
 <DestinationQueue>queue/DLQ</DestinationQueue>
 <MaxTimesRedelivered>10</MaxTimesRedelivered>
 <TimeToLive>0</TimeToLive>
 </DLQConfig>
 </MDBConfig>
 </proxy-factory-config>

I'm pretty new to JBoss, so there may be better ways of doing this. For example, you can change these settings using the jmx-console (look under jboss.j2ee). However, changes done in jmx-console are not permanent. You're settings will return to the default when you next restart JBoss.

If anyone can add to this, that would be greatly appreciated. For example, I would like to learn more about how we determine exactly how many MDBs are running at a given time.

2. Re: Number of Mbean instances in pool

genman Nov 24, 2004 1:32 PM (in response to saleti)

You mean, MDB running the onMessage() method? You can't get an active count AFAIK with JBoss. This MBean will tell you how many there were created:

jboss.j2ee:jndiName=local/MyBean,plugin=pool,service=EJB

You can probably expose a count by creating an MBean and calling it during the onMessage entrance and exit. Or add the feature to JBoss itself and post a patch.
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