On Tue, 2003-10-28 at 16:17, Scheil, Sven wrote:
> I'm sending several messages with different types to an mdb. One type stands
> for an "update" message. That means take the data from the message and
> update several entity beans with it. These updates have to be execute
> dstrictly serial. But it comes that more than one update message at the same
> time is send and jboss instantiates 2 or more mdb to execute the messages in
> parallel.
>
> How can I configure (or design?) my mdb that it exceute the messages of type
> "update" strictly one after the other.
The number of concurrent sessions for an MDB is configured on the
invoker. This is from standardjboss.xml in 3.2. You can make your
own configurations using jboss.xml
This isn't guaranteed to work. The MDB could rollback the message
delivery causing the messages to be delivered out of order.
Why do people take an asynchronous system like messaging and
try to reimplement a synchronous system. What is wrong with
invocations?
<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>
<MaximumSize>15</MaximumSize> <!-- !! HERE !! -->
<MaxMessages>1</MaxMessages>
<MDBConfig>
<ReconnectIntervalSec>10</ReconnectIntervalSec>
<DLQConfig>
<DestinationQueue>queue/DLQ</DestinationQueue>
<MaxTimesRedelivered>10</MaxTimesRedelivered>
<TimeToLive>0</TimeToLive>
</DLQConfig>
</MDBConfig>
</proxy-factory-config>
</invoker-proxy-binding>
Regards,
Adrian
> thanx sven
>
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