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Is SessionID & ProcessID required to complete WorkItem ?
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created by <a href="http://community.jboss.org/people/vikasjadon">vikas jadon</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/602740#602740">View the full discussion</a>
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<div class="jive-rendered-content"><p>I have question about  ProcessID and SessionID and there usage. I will continue to ask after explaining the confusion areas. This is with respect to webapplication, used by multiple users and deployed in clustered env.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>EntityManagerFactory emf =  Persistence.createEntityManagerFactory( "org.drools.persistence.jpa" );</p><p>   env = KnowledgeBaseFactory.newEnvironment();</p><p>   env.set( EnvironmentName.ENTITY_MANAGER_FACTORY, emf );</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>// create a new knowledge session that uses JPA to store the runtime state. Is this session for the server or I can create per user ? What is best?</p><p>// i understand creation session per user will be costly</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>ksession =   JPAKnowledgeService.newStatefulKnowledgeSession( kBase, null, env );</p><p>sessionID = ksession.getId();  // i can persist this,  </p><p>ksession.getWorkItemManager().registerWorkItemHandler("handle",my_handler_obj);</p><p>ksession.getWorkItemManager().registerWorkItemHandler("handle2",my_handler2_obj);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>//starting the process, I think this is for each user</p><p>pi1 =(WorkflowProcessInstance) ksession.startProcess("com.sample.bpmn.wfPOC",parameterMap);</p><p>// i can get process id of the process started, so i am in the first workItem now.</p><p>processID = pi1.getId(); // i can persist this too.</p><p>// i have a method in my handler for getting the workItemId. i persisted this workItemId</p><p>workItemId = my_handler_obj.getWorkItemId();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>At some time later I would like to complete the workItem, understanding the server is restarted </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>// I can use JPAKnowledgeService.loadStatefulKnowledgeSession(persisted_sessionID, kBase, null, env); but following also works</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>ksession =   JPAKnowledgeService.newStatefulKnowledgeSession( kBase, null, env );</p><p>sessionID = ksession.getId();  // it is different session</p><p>ksession.getWorkItemManager().registerWorkItemHandler("handle",my_handler_obj);</p><p>ksession.getWorkItemManager().registerWorkItemHandler("handle2",my_handler2_obj);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>// I can complete workItem which was left earlier,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>ksession.getWorkItemManager().completeWorkItem(workItemId, null);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><strong>My questions:</strong></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"><strong> </strong> </p><p>1. What is the use of sessionID, since i can complete workItem without sessionID? is if useful in this scenerio ? (I can load the session)</p><p>2. What is the use of processID since i can complete workItem without processID?? is it useful in this scenerio ? (i can start the process with process id)</p><p>3. Is only workItemID sufficient to complete a workItem in realtime? or am i missing something</p><p>4. How the knowledge session will work in case of clustered env across the JVM's using the load balancer.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Any help is highly appreciated.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>thanks</p><p>Vikas</p></div>
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