/** Callback interface to be notified of execution events like starting a process instance, * ending an activity instance or taking a transition. *   * @author Tom Baeyens * @author Joram Barrez */public interface ExecutionListener extends Serializable {  String EVENTNAME_START = "start";  String EVENTNAME_END = "end";  String EVENTNAME_TAKE = "take";  void notify(DelegateExecution execution) throws Exception;}

/** * @author Tom Baeyens */public interface TaskListener extends Serializable {  String EVENTNAME_CREATE = "create";  String EVENTNAME_ASSIGNMENT = "assignment";  String EVENTNAME_COMPLETE = "complete";  String EVENTNAME_DELETE = "delete";      /**   * Not an actual event, used as a marker-value for {
    @link TaskListener}s that should be called for all events,   * including {
    @link #EVENTNAME_CREATE}, {
    @link #EVENTNAME_ASSIGNMENT} and {
    @link #EVENTNAME_COMPLETE} and {
    @link #EVENTNAME_DELETE}.   */  String EVENTNAME_ALL_EVENTS = "all";    void notify(DelegateTask delegateTask);}

针对的事件不同：start，end, take 与 create，assignment, complete, delete.

通知的代理不同：DelegateExecution 与 DelegateTask