Examples of java.awt.EventQueue

java.awt.EventQueue
EventQueue is a platform-independent class that queues events, both from the underlying peer classes and from trusted application classes.
It encapsulates asynchronous event dispatch machinery which extracts events from the queue and dispatches them by calling {@link #dispatchEvent(AWTEvent) dispatchEvent(AWTEvent)} methodon this EventQueue with the event to be dispatched as an argument. The particular behavior of this machinery is implementation-dependent. The only requirements are that events which were actually enqueued to this queue (note that events being posted to the EventQueue can be coalesced) are dispatched:

Sequentially.
That is, it is not permitted that several events from this queue are dispatched simultaneously.
In the same order as they are enqueued.
That is, if AWTEvent A is enqueued to the EventQueue before AWTEvent B then event B will not be dispatched before event A.

Some browsers partition applets in different code bases into separate contexts, and establish walls between these contexts. In such a scenario, there will be one EventQueue per context. Other browsers place all applets into the same context, implying that there will be only a single, global EventQueue for all applets. This behavior is implementation-dependent. Consult your browser's documentation for more information.
For information on the threading issues of the event dispatch machinery, see AWT Threading Issues. @author Thomas Ball @author Fred Ecks @author David Mendenhall @version 1.105, 07/11/06 @since 1.1

 */
public class EventQueueMapping_storedQueueFor_Test extends EventQueueMapping_TestCase {
  @Test
  public void should_return_stored_EventQueue() {
    mapping.addQueueFor(component);
    EventQueue storedEventQueue = mapping.storedQueueFor(component);
    assertThat(storedEventQueue).isSameAs(eventQueue);
  }

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  }


  @Test
  public void should_return_null_if_EventQueue_reference_is_null() {
    queueMap.put(component, null);
    EventQueue storedEventQueue = mapping.storedQueueFor(component);
    assertThat(storedEventQueue).isNull();
  }

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  WindowEventQueueMapping mapping;
  Map<EventQueue, Map<Window, Boolean>> queueMap;


  @Before
  public final void setUp() {
    eventQueue = new EventQueue();
    toolkit = newToolkitStub(eventQueue);
    mapping = new WindowEventQueueMapping();
    queueMap = mapping.queueMap;
    onSetUp();
  }

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class EventQueueMapping {
  final Map<Component, WeakReference<EventQueue>> queueMap = newWeakHashMap();


  @RunsInCurrentThread
  void addQueueFor(@Nonnull Component c) {
    EventQueue queue = c.getToolkit().getSystemEventQueue();
    queueMap.put(c, new WeakReference<EventQueue>(queue));
  }

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    queueMap.put(c, new WeakReference<EventQueue>(queue));
  }


  @RunsInCurrentThread
  @Nullable EventQueue queueFor(@Nonnull Component c) {
    EventQueue queue = storedQueueFor(c);
    if (queue == null) {
      return c.getToolkit().getSystemEventQueue();
    }
    return queue;
  }

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  }


  @Nonnull Collection<EventQueue> eventQueues() {
    Set<EventQueue> eventQueues = newHashSet();
    for (WeakReference<EventQueue> reference : queueMap.values()) {
      EventQueue queue = queueFrom(reference);
      if (queue != null) {
        eventQueues.add(queue);
      }
    }
    return eventQueues;

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    Map<Window, Boolean> map = newWeakHashMap();
    queueMap.put(toolkit.getSystemEventQueue(), map);
  }


  void addQueueFor(@Nonnull Component component) {
    EventQueue queue = component.getToolkit().getSystemEventQueue();
    Map<Window, Boolean> windowMapping = queueMap.get(queue);
    if (windowMapping == null) {
      windowMapping = createWindowMapping(queue);
    }
    if (!(component instanceof Window) || parentOf(component) != null) {

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    return windowMapping;
  }


  @RunsInCurrentThread
  void removeMappingFor(@Nonnull Component component) {
    EventQueue queue = component.getToolkit().getSystemEventQueue();
    removeComponent(component, queue);
    for (EventQueue q : queueMap.keySet()) {
      removeComponent(component, q);
    }
  }

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 */
public class Context_eventQueueFor_Test extends Context_TestCase {
  @Test
  public void should_return_EventQueue_for_Component() {
    when(eventQueueMapping.queueFor(window)).thenReturn(eventQueue);
    EventQueue storedEventQueue = context.eventQueueFor(window);
    assertThat(storedEventQueue).isSameAs(eventQueue);
  }

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   * 
   * @throws EmptyStackException if no previous push was made on this {@code EventQueue}.
   */
  @Override
  public void pop() throws EmptyStackException {
    EventQueue systemEventQueue = toolkit.getSystemEventQueue();
    if (systemEventQueue == this) {
      super.pop();
    }
  }

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