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

            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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            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 (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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        if (dgl == null) {
            return;
        }
        if (dragGestureListener != null) {
            // awt.173=One listener is already exist.
            throw new TooManyListenersException(Messages.getString("awt.173")); //$NON-NLS-1$
        }


        dragGestureListener = dgl;
        registerListeners();
    }

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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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            // awt.181=Attempt to register context as its listener.
            throw new IllegalArgumentException(Messages.getString("awt.181")); //$NON-NLS-1$
        }
        if (listener != null) {
            // awt.173=One listener is already exist.
            throw new TooManyListenersException(Messages.getString("awt.173")); //$NON-NLS-1$
        }


        listener = dsl;
    }

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        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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