public interface TaskExecutionListener extends EventListener {
  // Called to notify that a task was executed.
  void taskExecuted(TaskExecutionEvent event);
}

public interface TaskExecutionListener extends EventListener {
  // Called before a task run() method is invoked.
  void taskStarting(TaskExecutionEvent event);
 
  // Called from the task's run() method by the user's code.
  void userNotification(TaskExecutionEvent event);
 
  // Called to notify that a task was executed.
  void taskExecuted(TaskExecutionEvent event);
}