Examples of java.util.TooManyListenersException

java.util.TooManyListenersException

The TooManyListenersException Exception is used as part of the Java Event model to annotate and implement a unicast special case of a multicast Event Source.

The presence of a "throws TooManyListenersException" clause on any given concrete implementation of the normally multicast "void addXyzEventListener" event listener registration pattern is used to annotate that interface as implementing a unicast Listener special case, that is, that one and only one Listener may be registered on the particular event listener source concurrently.
@see java.util.EventObject @see java.util.EventListener @version 1.14 05/11/17 @author Laurence P. G. Cable @since JDK1.1


            void verifyRequestor(Object requestor, BeanContextServiceRevokedListener bcsrl) throws TooManyListenersException {
                BeanContextServiceRevokedListener cbcsrl = (BeanContextServiceRevokedListener)requestors.get(requestor);


                if (cbcsrl != null && !cbcsrl.equals(bcsrl))
                    throw new TooManyListenersException();
            }

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        if (dsl == null) return;


        if (equals(dsl)) throw new IllegalArgumentException("DragSourceContext may not be its own listener");


        if (listener != null)
            throw new TooManyListenersException();
        else
            listener = dsl;
    }

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     * <code>DragGestureListener</code> has already been added.
     */


    public synchronized void addDragGestureListener(DragGestureListener dgl) throws TooManyListenersException {
        if (dragGestureListener != null)
            throw new TooManyListenersException();
        else {
            dragGestureListener = dgl;


            if (component != null) registerListeners();
        }

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        if (equals(dtl)) throw new IllegalArgumentException("DropTarget may not be its own Listener");


        if (dtListener == null)
            dtListener = dtl;
        else
            throw new TooManyListenersException();
    }

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     * listener.
     */
    synchronized public void addListener(Object listener) throws TooManyListenersException
    {
        if (_listener != null)
             throw new TooManyListenersException("Callback listener is already registered");
        _listener = listener;
    }

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   * @tests java.util.TooManyListenersException#TooManyListenersException()
   */
  public void test_Constructor() {
    // Test for method java.util.TooManyListenersException()
    try {
      throw new TooManyListenersException();
    } catch (TooManyListenersException e) {
      assertNull(
          "Message thrown with exception constructed with no message",
          e.getMessage());
    }

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   * @tests java.util.TooManyListenersException#TooManyListenersException(java.lang.String)
   */
  public void test_ConstructorLjava_lang_String() {
    // Test for method java.util.TooManyListenersException(java.lang.String)
    try {
      throw new TooManyListenersException("Gah");
    } catch (TooManyListenersException e) {
      assertEquals("Incorrect message thrown with exception", "Gah", e
          .getMessage());
    }
  }

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                getRequestors().put(requestor, csr);
                return;
            }


            if (bcsrl != null && !bcsrl.equals(csr.getListener())) {
                throw new TooManyListenersException();
            }
            csr.incrementRefCount();
        }

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     * listener.
     */
    synchronized public void addListener(Object listener) throws TooManyListenersException
    {
        if (_listener != null)
             throw new TooManyListenersException("Callback listener is already registered");
        _listener = listener;
    }

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            throws TooManyListenersException {


        if (sipStack.sipListener == null) {
            sipStack.sipListener = sipListener;
        } else if (sipStack.sipListener != sipListener) {
            throw new TooManyListenersException(
                    "Stack already has a listener. Only one listener per stack allowed");
        }


        if (sipStack.isLoggingEnabled(LogLevels.TRACE_DEBUG))
            sipStack.getStackLogger().logDebug("add SipListener " + sipListener);

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