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jbpm 4.4: sub-process in foreach: howto modify business key
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created by <a href="http://community.jboss.org/people/bardioc77">bardioc77</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/575112#575112">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hello,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>we are using the new foreach-node within our model to start a sub-process for each message in a list. The sub-process falls into a waiting state (with a set timeout). Each message in a list can be identified by a business key containing two values (person-id + contract-id). The (simplified) model is as follows:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-xml">
<span class="jive-xml-tag"><foreach g="493,601,48,48" name="foreach" var="message.incomingSingleMessages"></span>    <span class="jive-xml-tag"><transition g="10,-7" name="to sub: process single messages" to="sub: process single message"/></span><span class="jive-xml-tag"></foreach></span>
<span class="jive-xml-tag"><sub-process g="430,707,169,52" name="sub: process single message" sub-process-key="ProcessSingleMessage"></span>   <span class="jive-xml-tag"><transition g="-76,-7" name="to end foreach" to="end foreach"/></span><span class="jive-xml-tag"></sub-process></span>
<span class="jive-xml-tag"><join g="491,789,48,48" name="end foreach" multiplicity="#{message.incomingSingleMessages}"></span>    <span class="jive-xml-tag"><transition g="-170,-9" name="to map success message response" to="map success message response"/></span><span class="jive-xml-tag"></join></span>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Now it might happen that while one sub-process is in the defined waiting state, a message with the same business key is created. We would like to either delete the waiting state or modify it rather than creating another new sub-process. However, we do not know how to find the corresponding waiting execution of the previous sub-process to signal it.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>What we accomplished till now is the following. Within the sub-process right after the 'start'-node, we figure out, whether a sub-process already exists. In that case, we modify the message that waits and finish the sub-process. We use the following code for this.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code">
// collect waiting jobsfinal JobQuery jobQuery = this.managementService.createJobQuery().timers();for (final Job job : jobQuery.list()){     // get Process from job     ProcessInstance process = executionService.findProcessInstanceById(job.getExecution().getId());     final Execution exec = job.getExecution();     // get Variable name     final Message oldMessage = (Message) this.executionService.getVariable(exec.getId(), "message");     if (oldMessage.getPersonId() == message.getPersonId()
             &amp;&amp; oldMessage.getContractId() == message.getContractId())
     {
         // modify old message
     }
}
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The better solution would be to directly transition to the currently waiting sub-process by embedding the business key (personId + contractId) in the sub-process' id and simply try to find the waiting sub-process.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Has somebody an idea of how to accomplish this?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thank you very much.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Heiko</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>PS: If more or detailed information is needed, I'll provide them.</p></div>
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