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


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


    requestors.put(requestor, bcsrl);
      }

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      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 (debug)
      z.reportln( "RXTXPort:addEventListener()");
    if( SPEventListener != null )
    {
      throw new TooManyListenersException();
    }
    SPEventListener = lsnr;
    if( !MonitorThreadAlive )
    {
      MonitorThreadLock = true;

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  public synchronized void addEventListener(
    ParallelPortEventListener lsnr )
    throws TooManyListenersException
  {
    if( PPEventListener != null )
      throw new TooManyListenersException();
    PPEventListener = lsnr;
    monThread = new MonitorThread();
    monThread.start();
  }

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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(LogWriter.TRACE_DEBUG))
            sipStack.getStackLogger().logDebug("add SipListener " + sipListener);

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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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      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())
      sipStack.getLogWriter().logDebug("add SipListener " + sipListener);

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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 (logger.isLoggingEnabled(LogLevels.TRACE_DEBUG))
            logger.logDebug("add SipListener " + sipListener);

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        if (dtl == this) {
            throw new IllegalArgumentException(
                    "DropTarget cannot be added as listener to itself");
        }
        if (dropTargetListener != null) {
            throw new TooManyListenersException();
        }
        dropTargetListener = dtl;
    }

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        }
        if (dsl == this) {
            throw new IllegalArgumentException("Attempt to register context as its listener.");
        }
        if (listener != null) {
            throw new TooManyListenersException("One listener is already exist.");
        }


        listener = dsl;
    }

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