Examples of javax.websocket.MessageHandler

javax.websocket.MessageHandler
Developers implement MessageHandlers in order to receive incoming messages during a web socket conversation. Each web socket session uses no more than one thread at a time to call its MessageHandlers. This means that, provided each message handler instance is used to handle messages for one web socket session, at most one thread at a time can be calling any of its methods. Developers who wish to handle messages from multiple clients within the same message handlers may do so by adding the same instance as a handler on each of the Session objects for the clients. In that case, they will need to code with the possibility of their MessageHandler being called concurrently by multiple threads, each one arising from a different client session. @author dannycoward @since DRAFT 001

    }




    @SuppressWarnings("unchecked")
    private void sendMessageText(boolean last) throws WsIOException {
        MessageHandler mh = wsSession.getTextMessageHandler();
        if (mh != null) {
            if (mh instanceof WrappedMessageHandler) {
                long maxMessageSize =
                        ((WrappedMessageHandler) mh).getMaxMessageSize();
                if (maxMessageSize > -1 &&

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    @SuppressWarnings("unchecked")
    private void sendMessageBinary(ByteBuffer msg, boolean last)
            throws WsIOException {
        MessageHandler mh = wsSession.getBinaryMessageHandler();
        if (mh != null) {
            if (mh instanceof WrappedMessageHandler) {
                long maxMessageSize =
                        ((WrappedMessageHandler) mh).getMaxMessageSize();
                if (maxMessageSize > -1 && msg.remaining() > maxMessageSize) {

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    private boolean usePartial() {
        if (Util.isControl(opCode)) {
            return false;
        } else if (textMessage) {
            MessageHandler mh = wsSession.getTextMessageHandler();
            if (mh != null) {
                return mh instanceof MessageHandler.Partial<?>;
            }
            return false;
        } else {
            // Must be binary
            MessageHandler mh = wsSession.getBinaryMessageHandler();
            if (mh != null) {
                return mh instanceof MessageHandler.Partial<?>;
            }
            return false;
        }

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            Set<MessageHandler> results = new HashSet<>(2);
            if (indexBoolean == -1) {
                // Basic
                if (indexString != -1 || indexPrimitive != -1) {
                    MessageHandler mh = new PojoMessageHandlerWholeText(pojo, m,
                            session, config, null, params, indexPayload, false,
                            indexSession, maxMessageSize);
                    results.add(mh);
                } else if (indexReader != -1) {
                    MessageHandler mh = new PojoMessageHandlerWholeText(pojo, m,
                            session, config, null, params, indexReader, true,
                            indexSession, maxMessageSize);
                    results.add(mh);
                } else if (indexByteArray != -1) {
                    MessageHandler mh = new PojoMessageHandlerWholeBinary(pojo,
                            m, session, config, null, params, indexByteArray,
                            true, indexSession, false, maxMessageSize);
                    results.add(mh);
                } else if (indexByteBuffer != -1) {
                    MessageHandler mh = new PojoMessageHandlerWholeBinary(pojo,
                            m, session, config, null, params, indexByteBuffer,
                            false, indexSession, false, maxMessageSize);
                    results.add(mh);
                } else if (indexInputStream != -1) {
                    MessageHandler mh = new PojoMessageHandlerWholeBinary(pojo,
                            m, session, config, null, params, indexInputStream,
                            true, indexSession, true, maxMessageSize);
                    results.add(mh);
                } else if (decoderMatch != null && decoderMatch.hasMatches()) {
                    if (decoderMatch.getBinaryDecoders().size() > 0) {
                        MessageHandler mh = new PojoMessageHandlerWholeBinary(
                                pojo, m, session, config,
                                decoderMatch.getBinaryDecoders(), params,
                                indexPayload, true, indexSession, true,
                                maxMessageSize);
                        results.add(mh);
                    }
                    if (decoderMatch.getTextDecoders().size() > 0) {
                        MessageHandler mh = new PojoMessageHandlerWholeText(
                                pojo, m, session, config,
                                decoderMatch.getTextDecoders(), params,
                                indexPayload, true, indexSession, maxMessageSize);
                        results.add(mh);
                    }
                } else {
                    MessageHandler mh = new PojoMessageHandlerWholePong(pojo, m,
                            session, params, indexPong, false, indexSession);
                    results.add(mh);
                }
            } else {
                // ASync
                if (indexString != -1) {
                    MessageHandler mh = new PojoMessageHandlerPartialText(pojo,
                            m, session, params, indexString, false,
                            indexBoolean, indexSession, maxMessageSize);
                    results.add(mh);
                } else if (indexByteArray != -1) {
                    MessageHandler mh = new PojoMessageHandlerPartialBinary(
                            pojo, m, session, params, indexByteArray, true,
                            indexBoolean, indexSession, maxMessageSize);
                    results.add(mh);
                } else {
                    MessageHandler mh = new PojoMessageHandlerPartialBinary(
                            pojo, m, session, params, indexByteBuffer, false,
                            indexBoolean, indexSession, maxMessageSize);
                    results.add(mh);
                }
            }

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                case PONG: {
                    if (pongMessageHandler != null) {
                        throw new IllegalStateException(
                                sm.getString("wsSession.duplicateHandlerPong"));
                    }
                    MessageHandler handler = mhResult.getHandler();
                    if (handler instanceof MessageHandler.Whole<?>) {
                        pongMessageHandler =
                                (MessageHandler.Whole<PongMessage>) handler;
                    } else {
                        throw new IllegalStateException(

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        checkState();
        if (listener == null) {
            return;
        }


        MessageHandler wrapped = null;


        if (listener instanceof WrappedMessageHandler) {
            wrapped = ((WrappedMessageHandler) listener).getWrappedHandler();
        }


        if (wrapped == null) {
            wrapped = listener;
        }


        boolean removed = false;
        if (wrapped.equals(textMessageHandler) ||
                listener.equals(textMessageHandler)) {
            textMessageHandler = null;
            removed = true;
        }

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                case PONG: {
                    if (pongMessageHandler != null) {
                        throw new IllegalStateException(
                                sm.getString("wsSession.duplicateHandlerPong"));
                    }
                    MessageHandler handler = mhResult.getHandler();
                    if (handler instanceof MessageHandler.Whole<?>) {
                        pongMessageHandler =
                                (MessageHandler.Whole<PongMessage>) handler;
                    } else {
                        throw new IllegalStateException(

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        checkState();
        if (listener == null) {
            return;
        }


        MessageHandler wrapped = null;


        if (listener instanceof WrappedMessageHandler) {
            wrapped = ((WrappedMessageHandler) listener).getWrappedHandler();
        }


        if (wrapped == null) {
            wrapped = listener;
        }


        boolean removed = false;
        if (wrapped.equals(textMessageHandler) ||
                listener.equals(textMessageHandler)) {
            textMessageHandler = null;
            removed = true;
        }

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                clientEndpointConfig,
                new URI("wss://localhost:" + getPort() +
                        TesterFirehoseServer.Config.PATH));


        // Process incoming messages very slowly
        MessageHandler handler = new SleepingText(5000);
        wsSession.addMessageHandler(handler);
        wsSession.getBasicRemote().sendText("Hello");


        // Wait long enough for the buffers to fill and the send to timeout
        int count = 0;

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    private void invokeTextHandler(final BufferedTextMessage data, final HandlerWrapper handler, final boolean finalFragment) {


        session.getContainer().invokeEndpointMethod(executor, new Runnable() {
            @Override
            public void run() {
                MessageHandler mHandler = handler.getHandler();
                final String message = data.getData();


                if (mHandler instanceof MessageHandler.Partial) {
                    if (handler.getMessageType() == String.class) {
                        ((MessageHandler.Partial) handler.getHandler()).onMessage(message, finalFragment);

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