Examples of org.jgroups.blocks.MessageDispatcher

org.jgroups.blocks.MessageDispatcher
Provides synchronous and asynchronous message sending with request-response correlation; i.e., matching responses with the original request. It also offers push-style message reception (by internally using the PullPushAdapter).
Channels are simple patterns to asynchronously send a receive messages. However, a significant number of communication patterns in group communication require synchronous communication. For example, a sender would like to send a message to the group and wait for all responses. Or another application would like to send a message to the group and wait only until the majority of the receivers have sent a response, or until a timeout occurred. MessageDispatcher offers a combination of the above pattern with other patterns.
Used on top of channel to implement group requests. Client's handle() method is called when request is received. Is the equivalent of RpcProtocol on the application instead of protocol level. @author Bela Ban


        public void run() {
            try {
                c.connect("ChannelConcurrencyTest");
                if(useDispatcher && c.isConnected()) {
                    final MessageDispatcher md=new MessageDispatcher(c, null, null, new MyHandler());
                    for(int i=0;i < 10;i++) {
                        final RspList rsp=md.castMessage(null,
                                                         new Message(null, null, i),
                                                         GroupRequest.GET_ALL,
                                                         2500);
                        for(Object o:rsp.getResults()) {
                            assertEquals("Wrong result received at " + c.getAddress(), i, o);

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      // register as a listener for nodeid-adress mapping events
      nodeAddressMapListener = new NodeAddressMapListener();


      registerListener(nodeAddressMapListener);


      this.controlMessageDispatcher = new MessageDispatcher(syncChannel, cml, ml, rh, true);


      Receiver r = new DataReceiver();
      asyncChannel.setReceiver(r);


      syncChannel.connect(groupName);

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//      Thread.currentThread().setContextClassLoader(testLoader);    
//      try
//      {
         channel1 = (Channel) factoryMeth.invoke(factory1, factory1Args);
         dispatchers[0] = new MessageDispatcher(channel1, handler, handler, handler);
         
         channel1.connect("leaktest");
         assertEquals("No classloader leak on channel1 connect", null, handler.getLeakedClassLoader());
         
         channel2 = (Channel) factoryMeth.invoke(factory2, factory2Args);
         dispatchers[1] = new MessageDispatcher(channel2, handler, handler, handler);
         
         channel2.connect("leaktest");
         assertEquals("No classloader leak on channel2 connect", null, handler.getLeakedClassLoader());
//      }
//      finally
//      {
//         Thread.currentThread().setContextClassLoader(ours);
//      }
      
      log.info("Channels connected");
      
      ClassLoaderLeakRunner[] runners = new ClassLoaderLeakRunner[numThreads];      
      
      for (int i = 0; i < runners.length; i++)
      {
         MessageDispatcher disp = dispatchers[i % 2];
            
         runners[i] = new ClassLoaderLeakRunner(disp, numLoops, runnerGroup, semaphore);         
      }


      semaphore.acquire(numThreads);

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  public void test() throws Exception {
    
    logger.info("'org.jgroups.blocks.MessageDispatcher' test");
    
    channel = new JChannel(props);
    disp = new MessageDispatcher(channel, null, null, this);
    channel.connect("MessageDispatcherTestGroup");
    
    logger.info(" -> View Id: " + channel.getView().getViewId());
    logger.info(" -> View Creater: " + channel.getView().getCreator());
    logger.info(" -> View Coordinator: " + channel.getView().getMembers().get(0));

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    }
    handler = new MyRequestHandler(channel);
    messageListener = new MyMessageListener();
    membershipListener = new MyMembershipListener();
    
    disp = new MessageDispatcher(channel, messageListener, membershipListener, handler);
    channel.connect("MessageDispatcherTestGroup");
    
    Util.sleep(100);
    logger.info("Casting message to all group members");
    Message message = new Message(null, null, new String("MessageDispatcher Test Message"));

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    public void start() throws Exception {
        channel=new JChannel(props);
        //channel.setOpt(Channel.LOCAL, Boolean.FALSE);
        // disp=new MessageDispatcher(channel, null, null, this);
        disp=new MessageDispatcher(channel, null, null, this,
                false, // deadlock detection is disabled
                true); // concurrent processing is enabled
        channel.connect("MessageDispatcherTestGroup");


//        for(int i=0; i < 10; i++) {

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        if(debug) {
            debugger=new Debugger((JChannel)channel, cummulative);
            debugger.start();
        }
        //channel.setOpt(Channel.LOCAL, Boolean.FALSE);
        disp=new MessageDispatcher(channel, null, null, this);
        channel.connect("MessageDispatcherTestAsyncGroup");
    }

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      MembershipListener membershipListener = new ControlMembershipListener();
      
      RequestHandler requestHandler = new ControlRequestHandler();
      
      dispatcher = new MessageDispatcher(controlChannel, messageListener, membershipListener, requestHandler, true);
      
      starting = true;
      
      //first kickoff a thread to start the dataChannel
      Future<String> future = connectDataChannel();

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         {
            public Void run() throws Exception
            {
               channel = new JChannel(configurator);
               channel.setOpt(Channel.AUTO_RECONNECT, true);
               dispatcher = new MessageDispatcher(channel, null, RPCServiceImpl.this, RPCServiceImpl.this);
               channel.connect(clusterName);
               return null;
            }
         });
      }

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      MembershipListener membershipListener = new ControlMembershipListener();
      
      RequestHandler requestHandler = new ControlRequestHandler();
      
      dispatcher = new MessageDispatcher(controlChannel, messageListener, membershipListener, requestHandler, false);
      
      starting = true;
      
      //first kickoff a thread to start the dataChannel
      Future<String> future = connectDataChannel();

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