topic Re: Activiti Integration: How receive notification for UserTask in Alfresco Archive

Activiti Integration: How receive notification for UserTask

joeysr20det — Mon, 18 Jun 2012 18:44:17 GMT

We are integrating Activiti into our own software standing up and configuring our own ProcessEngine. We've managed to get most everything working, but we're a bit stumped on handling UserTasks when they are encountered in a given Process Instance. We are creating our own Activiti Explorer type inter

Re: Activiti Integration: How receive notification for UserTask

naag — Tue, 19 Jun 2012 04:42:01 GMT

You can create a custom BpmnParseListener implementation to add execution listeners globally for all processes:


public class CustomBpmnParseListener implements BpmnParseListener {
   // …

 @Override
 public void parseUserTask(Element userTaskElement, ScopeImpl scope, ActivityImpl activity) {
  activity.addExecutionListener(ExecutionListener.EVENTNAME_CREATE, new MyHandler());
 }
}

Then add it to your process engine configuration:


<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans.xsd">

  <bean id="processEngineConfiguration" class="org.activiti.cdi.CdiJtaProcessEngineConfiguration">
    <property name="customPostBPMNParseListeners">
      <list>
        <bean class="my.company.activiti.CustomBpmnParseListener" />
      </list>
    </property>
  </bean>
</beans>

I've seen more examples on the forums, just search for the BpmnParseListener interface. Of course this not only applies to user tasks, but all BPMN elements that are parsed by Activiti.

Regards,
Peter

Re: Activiti Integration: How receive notification for UserTask

joeysr20det — Tue, 19 Jun 2012 14:23:48 GMT

Awesome. This is exactly what I was after. I can figure it out from here.

Thanks!

Re: Activiti Integration: How receive notification for UserTask

joeysr20det — Tue, 19 Jun 2012 15:43:47 GMT

So from your example above,

Code:
public class CustomBpmnParseListener implements BpmnParseListener {
   // …

   @Override
   public void parseUserTask(Element userTaskElement, ScopeImpl scope, ActivityImpl activity) {
      activity.addExecutionListener(ExecutionListener.EVENTNAME_CREATE, new MyHandler());
   }
}

the ActivityImpl's addExecutionListener only takes an ExecutionListener and ExecutionListener does not contain a EVENTNAME_CREATE only ExecutionListener.START, ExecutionListener.END, ExecutionListener.TAKE. I can't seem to see how to use ExecutionListener here; is there something I'm missing?

Re: Activiti Integration: How receive notification for UserTask

joeysr20det — Tue, 19 Jun 2012 17:37:54 GMT

Ok I found what I needed to do. I instead just need to cast activity.getBehavoir to a UserTaskActivityBehavior and then add my listener. i.e.

@Override
public void parseUserTask(Element userTaskElement, ScopeImpl scope,
    ActivityImpl activity)
{
    ActivityBehavior ab = activity.getActivityBehavior();
    if (ab instanceof UserTaskActivityBehavior)
    {
      UserTaskActivityBehavior uab = (UserTaskActivityBehavior)ab;
      uab.getTaskDefinition().addTaskListener(TaskListener.EVENTNAME_CREATE, new MyTaskListener());
    }

Thanks again for getting me in the right direction.

Re: Activiti Integration: How receive notification for UserTask

naag — Fri, 22 Jun 2012 04:35:44 GMT

Seems I didn't read your post carefully enough, but your solution looks like what we're also doing 🙂 And also what Alfresco is doing (e.g. http://svn.alfresco.com/repos/alfresco-open-mirror/alfresco/HEAD/root/projects/repository/source/java/org/alfresco/repo/workflow/activiti/AlfrescoBpmnParseListener.java).

Cheers