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Re: How does a sub-process work?
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created by <a href="http://community.jboss.org/people/eaa">Esteban Aliverti</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/610791#610791">View the full discussion</a>
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<div class="jive-rendered-content"><p>Be careful! In your example, you are working with the process instance and not the session. So kcontext.<strong>getKnowledgeRuntime</strong>() will return the same StatefullKnowledgeSession in both of your processes. But, kcontext.<strong>getProcessInstance</strong>() will return different process instances of course (one is the main process and the other one is the sub-process).</p><p>From your tests I assume you are talking about process variables. Process variables only exist in the context of the process instance. So, if you want to usa a variable from your main process in your sub-process, you need to do the mappings in the reusable-subprocess node.</p><p>For example, in the test I have provided to you, I'm declaring a variable (messages) in the parent process:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><property id="messages" itemSubjectRef="_messagesItem"/></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Because I want to use this variable in my sub-process, I need to declare a variable of the same type in it:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><property id="internalMessages" itemSubjectRef="_internalMessagesItem"/></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p> Then, in the reusable-subprocess node (in the paren process) I need to copy the value from messages to internalMessages:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p class="line" id="LC52" style="padding-left: 1em;"><dataInputAssociation></p><p class="line" id="LC53" style="padding-left: 1em;">        <sourceRef>messages</sourceRef></p><p class="line" id="LC54" style="padding-left: 1em;">        <targetRef>_5_internalMessagesInput</targetRef></p><p class="line" id="LC55" style="padding-left: 1em;"></dataInputAssociation></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>And because I need to use the modified value of this variable in my parent process once the sub-process is finished, I also need to do an output mapping:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>   </p><p class="line" id="LC60" style="padding-left: 1em;"><dataOutputAssociation></p><p class="line" id="LC61" style="padding-left: 1em;">        <sourceRef>_5_internalMessagesOutput</sourceRef></p><p class="line" id="LC62" style="padding-left: 1em;">        <targetRef>messages</targetRef></p><p class="line" id="LC63" style="padding-left: 1em;"></dataOutputAssociation></p><p class="line" style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Of course you can use eclipse editor to do all these things in a more user-friendly way <span> :) </span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Best Regards,</p></div>
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