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

        if (listeners == null) {
            listeners = new Vector<SampleListener>();
        }


        if (listeners.size() >= 100) {
            throw new TooManyListenersException(
                    "Number of listeners could not exceed 100");
        }
        listeners.add(listener);
    }

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        if (dtl == this) {
            // awt.176=DropTarget cannot be added as listener to itself
            throw new IllegalArgumentException(Messages.getString("awt.176")); //$NON-NLS-1$
        }
        if (dropTargetListener != null) {
            throw new TooManyListenersException();
        }
        dropTargetListener = dtl;
    }

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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())
      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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            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.getStackLogger().logDebug("add SipListener " + sipListener);

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    public void setImportEventListener( ImportEventListener listener )
  throws TooManyListenersException
    {
  if ( _listener != null )
      throw new TooManyListenersException( Messages.message( "dsml.onlyOneListener" ) );
  _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 (logger.isLoggingEnabled(LogLevels.TRACE_DEBUG))
            logger.logDebug("add SipListener " + sipListener);

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    ComponentListener listener;


    public void addComponentListener(ComponentListener l) throws TooManyListenersException {
        if(listener != null)
            throw new TooManyListenersException();
        listener = l;
    }

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    if (dtl.equals(this))
      throw new IllegalArgumentException();
    
    if (dropTargetListener != null)
      throw new TooManyListenersException();
    
    dropTargetListener = dtl;
  }

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