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Questions on JBPM 4.4.
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created by <a href="http://community.jboss.org/people/AESSIARI">Abdelilah Essiari</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/566219#566219">View the full discussion</a>
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<div class="jive-rendered-content"><p>I am evaluating JBPM 4.4 (JPDL)  for my project and I have ran into a couple of issues:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>One is that a mix of exclusive continuations are asynchronous continuations does not quite work.</p><p>Upon a close look at AcquireJobsCmd.java, it becomes aparrent:</p><p>          a) more than one exclusive job can execute in different transactions.</p><p>          b) an exclusive job concurrently with an asynchrouns job is running.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>This defeats my understanding of what exclusive means. I have tentatively modified AcquireJobsCmd.java by ensuring</p><p>that a and b do not happen. This important in my case as I have an assign statement that needs to update a process</p><p>variable inside a forEach with asynchronous java continuations as shown below. This only works after I made my changes.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p> <span style="font-size: 8pt;">     <variable history="false" name="GlobalMap" type="serializable"><br/>           <map><br/>           </map><br/>       </variable></span></p><p><span style="font-size: 8pt;"><br/></span></p><p><span style="font-size: 8pt;">      <foreach g="160,261,48,48" in="#{dataSources}" name="foreach" <span style="color: #ff0000;">var="dataSource"</span>><br/>           <transition  to="do lookup"/><br/>       </foreach><br/>   <br/>       <java <span style="color: #ff0000;">continue="async"</span> class="test.JavaService" g="327,259,98,50" method="lookup" name="do lookup" <span style="color: #ff0000;">var="returnVar"</span>><br/>           <arg><br/>               <object expr="#{dataSource}"/><br/>        </arg><br/>        <arg><br/>            <string value="kw"/><br/>        </arg><br/>        <transition <span style="color: #ff0000;">continue="exclusive"</span> to="copy" /><br/>      java></span><br/>     <br/>    <assign from-expr="#{returnVar}" name="copy" to-expr="#{GlobalMap[dataSource]}"><br/>        <transition to="join"/><br/>    </assign><br/>   <br/>    <join g="567,259,80,40" multiplicity="2" name="join"><br/>        <transition to="do materialize"/><br/>    </join></p><p>      ...</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The other question is that <em>returnVar</em> is actually mapped to the parent execution. It should map to the forked execution as is the variable <em>dataSource</em>. Shouldn't it?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>In any case the tentative fix for this was easy. Just changed a one line in JavaActivity.java.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>if (variableName!=null) {<br/>        //  execution.setVariable(variableName, returnValue);<br/>       execution.createVariable(variableName, returnValue); <br/>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Hope to hear from someone. Thanks in advance.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>aes.</p></div>
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