topic Re: tasklistener event order in Alfresco Archive

tasklistener event order

heymjo — Wed, 15 Jun 2011 13:21:31 GMT

Hi,The doc states about tasklistener events that the assignment event is fired before the create event.event (required): the type of task event on which the task listener will be invoked. Possible events arecreate: occurs when the task has been created an all task properties are set. assignment:

Re: tasklistener event order

heymjo — Wed, 15 Jun 2011 13:29:31 GMT

as often, only after posting to the forum i notice the issue :shock:

UserActivityBehaviour.handleAssignments sets the assignee but only if it is declared via the activiti:assignee shortcut


  protected void handleAssignments(TaskEntity task, ActivityExecution execution) {
    if (taskDefinition.getAssigneeExpression() != null) {
      task.setAssignee((String) taskDefinition.getAssigneeExpression().getValue(execution));
    }
    ….

so it looks like the doc needs adjusting and state that the assignment event is only fired before create in the case where an activiti:assignee element is declared on the user task.

Jorg

Re: tasklistener event order

frederikherema1 — Wed, 15 Jun 2011 13:52:41 GMT

In the task-definition, your listener is listening for the "create" event in the example. Or is that intended?

Re: tasklistener event order

heymjo — Thu, 16 Jun 2011 07:25:14 GMT

well it doesn't matter really. If you put a breakpoint in TaskEntity.fireEvent you will observe that the order of events fired is always "create", "assignment", "complete" for below simple workflow


 <process id="FourEyesExample">

    <startEvent id="begin"/>

    <sequenceFlow id="flow1" sourceRef="begin" targetRef="createReport"/>

    <userTask id="createReport" name="create the report">
      <potentialOwner>
        <resourceAssignmentExpression>
          <formalExpression>ROLE_CREATE</formalExpression>
        </resourceAssignmentExpression>
      </potentialOwner>
    </userTask>

    <sequenceFlow id="flow2" sourceRef="createReport" targetRef="end"/>

    <endEvent id="end"/>

  </process>

Re: tasklistener event order

frederikherema1 — Thu, 16 Jun 2011 07:29:37 GMT

Makes sense that the assignment event is not thrown when a "potentialOwner" is used (corresponds to a candidate, not a fixed assignee).

Re: tasklistener event order

heymjo — Thu, 16 Jun 2011 08:20:47 GMT

mmmyeah ok understood, but the docs needs rewording then because it's not as clear cut as it says

… when process execution arrives in a userTask, first an assignment event will be fired, before the create event is fired.

so in order to implement foureyes paradigm i will need two listeners, <activiti:taskListener event="create,assignment"> does not work (yet?). That will get pretty verbose.

Re: tasklistener event order

frederikherema1 — Thu, 16 Jun 2011 08:23:09 GMT

The only way is to define 2 seperate listeners… One for create, and another one for assignment.