[jboss-user] [jBPM] - Waiting for events to occur in a flow?

Jim Beam do-not-reply at jboss.com
Fri Sep 28 15:55:39 EDT 2012

Jim Beam [https://community.jboss.org/people/jamesbeam] created the discussion

"Waiting for events to occur in a flow?"

To view the discussion, visit: https://community.jboss.org/message/762276#762276

I'm a flow noob (...obviously) using 5.3.

I have a few examples working and am trying to integrate some rules.  I think I have a fundamental misunderstanding of rule tasks (maybe flow).   Basically, I want to have a more complicated process and I want to only advance to the next node when a certain set of conditions are met.  

To set up a simple test, I have a flow, *start node->rule task->script task (writes "Done")-> end node*.  I don't want to get to the script task until the process receives a message with text='hi' or text='yo'.  I set up the following ruleflow group (I have a Message and MessageB class):

  rule "waitforit rule"
       ruleflow-group "waitforMessage"
       dialect "mvel"
      not ($m : Message())
      System.out.println("no message yet");

  rule "dotone"
       ruleflow-group "waitforMessage"
       dialect "mvel"
      $m : Message(text=='hi' || text=='yo')
      System.out.println("got message:"+$m.text);

I tried:

1) I start the process and insert a MessageB object (i see hibernate update the session).  I expected the first rule to fire, but it does not.  Then I insert a Message object and the process/app just exits (WITHOUT) giving me the "Done" message (i have a thread.sleep after the insert - and no dispose).

2) So, I start the process and do a fireallrules, wait 10 seconds then insert a Message object.  But, as soon as I fireallrules, I get the "no message yet" message AND the "Done" message.  Nothing happens for 10 seconds and then the process ends.

So, I have just one question....in 6 parts:

    a) in #1, why doesn't the first rule fire?  
    b)   and Why/How does the process exit without a "Done" message?  (I don't dispose of the ksession in my code)
    c) in #2, why does the fireallrules immediatly trigger the "Done" message?
    d) as I read it in the documentation, the rule task should keep the process from advancing until all of the rules are no longer active.  However, I thought the first rule would ensure that the group was active until a Message arives.  Is that wrong?
    e) what is the right way to do this sort of thing?
    f)  Can someone clue me into what I am doing wrong?  Am I thinking about this in the wrong way? 

Thanks very much for your thoughts/comments.

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