Examples of org.camunda.bpm.engine.delegate.TaskListener

org.camunda.bpm.engine.delegate.TaskListener
Listener interface implemented by user code which wants to be notified when a property of a task changes.
The following Task Events are supported:
- {@link #EVENTNAME_CREATE}
- {@link #EVENTNAME_ASSIGNMENT}
- {@link #EVENTNAME_COMPLETE}
- {@link #EVENTNAME_DELETE}
@author Tom Baeyens


  protected void notifyTaskListener(DelegateTask task) throws Exception {
    ProcessApplicationReference processApp = Context.getCurrentProcessApplication();
    try {
      ProcessApplicationInterface processApplication = processApp.getProcessApplication();
      TaskListener taskListener = processApplication.getTaskListener();
      if(taskListener != null) {
        taskListener.notify(task);


      } else {
        LOG.log(Level.FINE, "Target process application '"+processApp.getName()+"' does not provide a TaskListener.");


      }

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    final List<String> events = new ArrayList<String>();


    EmbeddedProcessApplication processApplication = new EmbeddedProcessApplication() {
      public TaskListener getTaskListener() {
        return new TaskListener() {
          public void notify(DelegateTask delegateTask) {
            events.add(delegateTask.getEventName());
          }
        };
      }

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    HumanTask humanTask = getDefinition(element);


    List<CamundaTaskListener> listeners = queryExtensionElementsByClass(humanTask, CamundaTaskListener.class);


    for (CamundaTaskListener listener : listeners) {
      TaskListener taskListener = initializeTaskListener(element, activity, context, listener);


      String eventName = listener.getCamundaEvent();
      if (eventName != null) {
        taskDefinition.addTaskListener(eventName, taskListener);

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    Collection<CamundaField> fields = listener.getCamundaFields();
    List<FieldDeclaration> fieldDeclarations = initializeFieldDeclarations(element, activity, context, fields);


    ExpressionManager expressionManager = context.getExpressionManager();


    TaskListener taskListener = null;


    String className = listener.getCamundaClass();
    String expression = listener.getCamundaExpression();
    String delegateExpression = listener.getCamundaDelegateExpression();
    CamundaScript scriptElement = listener.getCamundaScript();

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      for (Element taskListenerElement : taskListenerElements) {
        String eventName = taskListenerElement.attribute("event");
        if (eventName != null) {
          if (TaskListener.EVENTNAME_CREATE.equals(eventName) || TaskListener.EVENTNAME_ASSIGNMENT.equals(eventName)
                  || TaskListener.EVENTNAME_COMPLETE.equals(eventName) || TaskListener.EVENTNAME_DELETE.equals(eventName)) {
            TaskListener taskListener = parseTaskListener(taskListenerElement);
            taskDefinition.addTaskListener(eventName, taskListener);
          } else {
            addError("Attribute 'event' must be one of {create|assignment|complete|delete}", userTaskElement);
          }
        } else {

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      }
    }
  }


  protected TaskListener parseTaskListener(Element taskListenerElement) {
    TaskListener taskListener = null;


    String className = taskListenerElement.attribute("class");
    String expression = taskListenerElement.attribute("expression");
    String delegateExpression = taskListenerElement.attribute("delegateExpression");
    Element scriptElement = taskListenerElement.elementNS(BpmnParser.ACTIVITI_BPMN_EXTENSIONS_NS, "script");

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  public ClassDelegateTaskListener(Class<?> clazz, List<FieldDeclaration> fieldDeclarations) {
    super(clazz, fieldDeclarations);
  }


  public void notify(DelegateTask delegateTask) {
    TaskListener taskListenerInstance = getTaskListenerInstance();
    try {
      Context.getProcessEngineConfiguration()
        .getDelegateInterceptor()
        .handleInvocation(new TaskListenerInvocation(taskListenerInstance, delegateTask));

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    assertEquals(1, taskDefinition.getTaskListeners().size());


    List<TaskListener> createListeners = taskDefinition.getTaskListener(event);
    assertEquals(1, createListeners.size());
    TaskListener listener = createListeners.get(0);


    assertTrue(listener instanceof ClassDelegateTaskListener);


    ClassDelegateTaskListener classDelegateListener = (ClassDelegateTaskListener) listener;
    assertEquals(className, classDelegateListener.getClassName());

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    assertEquals(1, taskDefinition.getTaskListeners().size());


    List<TaskListener> createListeners = taskDefinition.getTaskListener(event);
    assertEquals(1, createListeners.size());
    TaskListener listener = createListeners.get(0);


    assertTrue(listener instanceof DelegateExpressionTaskListener);


    DelegateExpressionTaskListener delegateExpressionListener = (DelegateExpressionTaskListener) listener;
    assertEquals(delegateExpression, delegateExpressionListener.getExpressionText());

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    assertEquals(1, taskDefinition.getTaskListeners().size());


    List<TaskListener> createListeners = taskDefinition.getTaskListener(event);
    assertEquals(1, createListeners.size());
    TaskListener listener = createListeners.get(0);


    assertTrue(listener instanceof ExpressionTaskListener);


    ExpressionTaskListener expressionListener = (ExpressionTaskListener) listener;
    assertEquals(expression, expressionListener.getExpressionText());

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