[jboss-user] [jBPM] - Re: How to create a simple waiting workflow

[Jan Uhlir]

Jan Uhlir [https://community.jboss.org/people/espinosa_cz] created the discussion

"Re: How to create a simple waiting workflow"

To view the discussion, visit: https://community.jboss.org/message/717300#717300

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This works (6a):
 https://community.jboss.org/servlet/JiveServlet/showImage/17999/jbpm+screenshot+wait+state+working+6a.png  https://community.jboss.org/servlet/JiveServlet/downloadImage/17999/jbpm+screenshot+wait+state+working+6a.png 

This works too (6b):
 https://community.jboss.org/servlet/JiveServlet/showImage/18000/jbpm+screenshot+wait+state+working+6b.png  https://community.jboss.org/servlet/JiveServlet/downloadImage/18000/jbpm+screenshot+wait+state+working+6b.png 
*BPMN2 Code 6a:*




*BPMN2 Code 6b:*




*Code for class behind JavaTask task node:*
public class JavaTask6WorkItemHandler implements WorkItemHandler {

    @Override
    public void executeWorkItem(WorkItem workItem, WorkItemManager manager) {

        System.out.println("Inside JavaTask : " + workItem.getName());

        // notify manager that work item has been completed
        // Essential! Custom tasks are by default set "wait for completion = true", this makes them "false"
        manager.completeWorkItem(workItem.getId(), null);
    }


    @Override
    public void abortWorkItem(WorkItem workItem, WorkItemManager manager) {
        // do nothing
    }
}


*Test run code, start and signalize the process:*
public class SimpleProcess6aRun {

    public static void main(String[] args) {
        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
        kbuilder.add(ResourceFactory.newClassPathResource("simple_process_6a.bpmn"), ResourceType.BPMN2);
        KnowledgeBase kbase = kbuilder.newKnowledgeBase();
        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
        ksession.getWorkItemManager().registerWorkItemHandler("JavaTask6", new JavaTask6WorkItemHandler());

        ProcessInstance processInstance = ksession.startProcess("SimpleProcess6a");
        Assert.assertNotNull(processInstance);

        // print all running processes
        Collection allProcesses = ksession.getProcessInstances();
        for (ProcessInstance p : allProcesses) {
            System.out.println("Running - " + p);
        }

        // test wait state
        Assert.assertEquals(ProcessInstance.STATE_ACTIVE, processInstance.getState());

        // send signal
        // ksession.signalEvent("fooSignal", "fooSignal"); // global signal
        processInstance.signalEvent("fooSignal", null); // process specific signal

        // test successful finish (test state)
        Assert.assertEquals(ProcessInstance.STATE_COMPLETED, processInstance.getState());
    }
}
// the code for SimpleProcess6bRun (6b process) is analogous


This  https://community.jboss.org/thread/165545 forum thread is related too. I found Esteban Aliverti comment very helpful and so his examples on github.

Is there any real difference between 6a and 6b? Otherwise I am going to use the simpler variant, without Gateway.

If I have, let's say, process with 20 wait nodes, I have to add 20 more Event nodes after every task?
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