Java java.awt.event Class InvocationEvent（JDK8）

Field Detail

• INVOCATION_FIRST

  public static final int INVOCATION_FIRST

  Marks the first integer id for the range of invocation event ids.

  See Also:

  Constant Field Values

• INVOCATION_DEFAULT

  public static final int INVOCATION_DEFAULT

  The default id for all InvocationEvents.

  See Also:

  Constant Field Values

• INVOCATION_LAST

  public static final int INVOCATION_LAST

  Marks the last integer id for the range of invocation event ids.

  See Also:

  Constant Field Values

• runnable

  protected Runnable runnable

  The Runnable whose run() method will be called.

• notifier

  protected volatile Object notifier

  The (potentially null) Object whose notifyAll() method will be called immediately after the Runnable.run() method has returned or thrown an exception or after the event was disposed.

  See Also:

  isDispatched()

• catchExceptions

  protected boolean catchExceptions

  Set to true if dispatch() catches Throwable and stores it in the exception instance variable. If false, Throwables are propagated up to the EventDispatchThread's dispatch loop.

Constructor Detail

• InvocationEvent

  public InvocationEvent(Object source,
                         Runnable runnable)

  Constructs an InvocationEvent with the specified source which will execute the runnable's run method when dispatched.

  This is a convenience constructor. An invocation of the form InvocationEvent(source, runnable) behaves in exactly the same way as the invocation of InvocationEvent(source, runnable, null, false).

  This method throws an IllegalArgumentException if source is null.

  Parameters:

  source - The Object that originated the event

  runnable - The Runnable whose run method will be executed

  Throws:

  IllegalArgumentException - if source is null

  See Also:

  EventObject.getSource(), InvocationEvent(Object, Runnable, Object, boolean)

• InvocationEvent

  public InvocationEvent(Object source,
                         Runnable runnable,
                         Object notifier,
                         boolean catchThrowables)

  Constructs an InvocationEvent with the specified source which will execute the runnable's run method when dispatched. If notifier is non-null, notifyAll() will be called on it immediately after run has returned or thrown an exception.

  An invocation of the form InvocationEvent(source, runnable, notifier, catchThrowables) behaves in exactly the same way as the invocation of InvocationEvent(source, InvocationEvent.INVOCATION_DEFAULT, runnable, notifier, catchThrowables).

  This method throws an IllegalArgumentException if source is null.

  Parameters:

  source - The Object that originated the event

  runnable - The Runnable whose run method will be executed

  notifier - The Object whose notifyAll method will be called after Runnable.run has returned or thrown an exception or after the event was disposed

  catchThrowables - Specifies whether dispatch should catch Throwable when executing the Runnable's run method, or should instead propagate those Throwables to the EventDispatchThread's dispatch loop

  Throws:

  IllegalArgumentException - if source is null

  See Also:

  EventObject.getSource(), InvocationEvent(Object, int, Runnable, Object, boolean)

• InvocationEvent

  public InvocationEvent(Object source,
                         Runnable runnable,
                         Runnable listener,
                         boolean catchThrowables)

  Constructs an InvocationEvent with the specified source which will execute the runnable's run method when dispatched. If listener is non-null, listener.run() will be called immediately after run has returned, thrown an exception or the event was disposed.

  This method throws an IllegalArgumentException if source is null.

  Parameters:

  source - The Object that originated the event

  runnable - The Runnable whose run method will be executed

  listener - The RunnableRunnable whose run() method will be called after the InvocationEvent was dispatched or disposed

  catchThrowables - Specifies whether dispatch should catch Throwable when executing the Runnable's run method, or should instead propagate those Throwables to the EventDispatchThread's dispatch loop

  Throws:

  IllegalArgumentException - if source is null

• InvocationEvent

  protected InvocationEvent(Object source,
                            int id,
                            Runnable runnable,
                            Object notifier,
                            boolean catchThrowables)

  Constructs an InvocationEvent with the specified source and ID which will execute the runnable's run method when dispatched. If notifier is non-null, notifyAll will be called on it immediately after run has returned or thrown an exception.

  This method throws an IllegalArgumentException if source is null.

  Parameters:

  source - The Object that originated the event

  id - An integer indicating the type of event. For information on allowable values, see the class description for InvocationEvent

  runnable - The Runnable whose run method will be executed

  notifier - The Object whose notifyAll method will be called after Runnable.run has returned or thrown an exception or after the event was disposed

  catchThrowables - Specifies whether dispatch should catch Throwable when executing the Runnable's run method, or should instead propagate those Throwables to the EventDispatchThread's dispatch loop

  Throws:

  IllegalArgumentException - if source is null

  See Also:

  EventObject.getSource(), AWTEvent.getID()

Method Detail

• dispatch

  public void dispatch()

  Executes the Runnable's run() method and notifies the notifier (if any) when run() has returned or thrown an exception.

  Specified by:

  dispatch in interface ActiveEvent

  See Also:

  isDispatched()

• getException

  public Exception getException()

  Returns any Exception caught while executing the Runnable's run() method.

  Returns:

  A reference to the Exception if one was thrown; null if no Exception was thrown or if this InvocationEvent does not catch exceptions

• getThrowable

  public Throwable getThrowable()

  Returns any Throwable caught while executing the Runnable's run() method.

  Returns:

  A reference to the Throwable if one was thrown; null if no Throwable was thrown or if this InvocationEvent does not catch Throwables

  Since:

  1.5

• getWhen

  public long getWhen()

  Returns the timestamp of when this event occurred.

  Returns:

  this event's timestamp

  Since:

  1.4

• isDispatched

  public boolean isDispatched()

  Returns true if the event is dispatched or any exception is thrown while dispatching, false otherwise. The method should be called by a waiting thread that calls the notifier.wait() method. Since spurious wakeups are possible (as explained in Object.wait()), this method should be used in a waiting loop to ensure that the event got dispatched:

       while (!event.isDispatched()) {
           notifier.wait();
       }
   

  If the waiting thread wakes up without dispatching the event, the isDispatched() method returns false, and the while loop executes once more, thus, causing the awakened thread to revert to the waiting mode.

  If the notifier.notifyAll() happens before the waiting thread enters the notifier.wait() method, the while loop ensures that the waiting thread will not enter the notifier.wait() method. Otherwise, there is no guarantee that the waiting thread will ever be woken from the wait.

  Returns:

  true if the event has been dispatched, or any exception has been thrown while dispatching, false otherwise

  Since:

  1.7

  See Also:

  dispatch(), notifier, catchExceptions

• paramString

  public String paramString()

  Returns a parameter string identifying this event. This method is useful for event-logging and for debugging.

  Overrides:

  paramString in class AWTEvent

  Returns:

  A string identifying the event and its attributes