Jim Hill [http://community.jboss.org/people/jdh] created the discussion

"Re: A question on the external event using event Correlation"

To view the discussion, visit: http://community.jboss.org/message/593075#593075

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I am implementing a similar solution and agree with Mauricio that you need to 
implement a business layer.  I am not as familiar with Drools and took a 
different approach which I will describe briefly.  I implemented the Selective 
Consumer pattern as described in Hohpe and Woolf's Enterprise Integration 
Patterns book.  In my case processes were started before the business key was 
assigned, so my messages do not always pass around the same business key.  This 
makes it harder to link them back to a running instance of a process.  I ended 
up writing a manager component in mule that receives JMS messages that may need 
to go to JBPM processes.  This component manages the start and end of process 
instances.  When it receives a messages it extracts the business key from the 
message and looks to a self contained map to determine if this key is related 
to an active process. If we find a match I pass the message to the active state 
in the process.  These are defined as custom nodes in the process.  The class 
implements ExternalActivityBehavior.  It is responsible for making sure it 
received the right message.  The value it returns is used by a decision node to 
determine if we need to keep waiting or can move on to the next wait state.

This is just one approach.  I welcome feedback from those who have been at this 
longer than I have.  It is working for me, but I am struggling with group 
timers which I am trying to implement in order to kill the process if the right 
message does not show up in a specified period of time.  Hope this adds an 
option for you to pursue.

Jim
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