Examples of org.jgroups.Channel

org.jgroups.Channel
A channel represents a group communication endpoint (like BSD datagram sockets). A client joins a group by connecting the channel to a group address and leaves it by disconnecting. Messages sent over the channel are received by all group members that are connected to the same group (that is, all members that have the same group address).
The FSM for a channel is roughly as follows: a channel is created (unconnected). The channel is connected to a group (connected). Messages can now be sent and received. The channel is disconnected from the group (unconnected). The channel could now be connected to a different group again. The channel is closed (closed).
Only a single sender is allowed to be connected to a channel at a time, but there can be more than one channel in an application.
Messages can be sent to the group members using the send method and messages can be received using receive (pull approach).
A channel instance is created using either a ChannelFactory or the public constructor. Each implementation of a channel must provide a subclass of Channel and an implementation of ChannelFactory.
Various degrees of sophistication in message exchange can be achieved using building blocks on top of channels; e.g., light-weight groups, synchronous message invocation, or remote method calls. Channels are on the same abstraction level as sockets, and should really be simple to use. Higher-level abstractions are all built on top of channels. @author Bela Ban @see java.net.DatagramPacket @see java.net.MulticastSocket

   private static final String cName = "FlushWithChannelFailuresTest";
   
    @Test
    public void testAndLoop() throws Exception {
        int numChannels = 10;
        Channel channels[] = new Channel[numChannels];
        for (int j = 0; j < numChannels; j++) {
            if (j == 0) {
                channels[j] = createChannel(true, numChannels);
            } else {
                channels[j] = createChannel((JChannel) channels[0]);

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    @Test
    public void testAdditionalData() throws Exception {
        for(int i=1;i <= 2;i++) {
            System.out.println("-- attempt # " + i + "/2");
            Channel c=createChannel(true);
            try {
                Map<String,Object> m=new HashMap<String,Object>();
                m.put("additional_data", new byte[] { 'b', 'e', 'l', 'a' });
                c.down(new Event(Event.CONFIG, m));
                c.connect("AddDataTest.testadditionalData()");
                UUID addr=(UUID)c.getAddress();
                System.out.println("address is " + addr);
                assert addr.getAdditionalData() != null;
                assert addr.getAdditionalData()[0] == 'b';
            }
            finally {
                c.close();
            }
        }
    }

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    System.out.println("    receive message: " + msg.getObject());
  }


  public void start(String props, String name) throws Exception {
    
    Channel channel = new JChannel(props);
    channel.setReceiver(this);
    
    if(name != null) {
      channel.setName(name);
    }
    
    channel.connect("LargeStateChannel");
    
    while(true){
      
      Msg msg = new Msg(10000);
      channel.send(null, msg);
      
      System.out.println("Press Enter to re-test\n");
      System.in.read();
    }
  }

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      private Set<String> caches = new HashSet<String>();
      
      LockManagerEntry(Cache<?, ?> cache)
      {
         JGroupsTransport transport = (JGroupsTransport) cache.getAdvancedCache().getRpcManager().getTransport();
         Channel channel = transport.getChannel();
         
         this.service = new CoreGroupCommunicationService();
         this.service.setChannel(channel);
         this.service.setScopeId(SCOPE_ID);
         
         try
         {
            this.service.start();
         }
         catch (Exception e)
         {
            throw new IllegalStateException("Unexpected exception while starting group communication service for " + channel.getClusterName());
         }
         
         this.lockManager = new SharedLocalYieldingClusterLockManager(SERVICE_NAME, this.service, this.service);
         
         try
         {
            this.lockManager.start();
         }
         catch (Exception e)
         {
            this.service.stop();
            throw new IllegalStateException("Unexpected exception while starting lock manager for " + channel.getClusterName());
         }
      }

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    private void start(String props, String stack_name) throws Exception {
        factory=new JChannelFactory();
        factory.setMultiplexerConfig(props);


        final Channel ch1, ch2;
        ch1=factory.createMultiplexerChannel(stack_name, "id-1");
        Draw draw1=new Draw(ch1);
        ch1.connect("bela");


        ch2=factory.createMultiplexerChannel(stack_name, "id-2");
        Draw draw2=new Draw(ch2);
        ch2.connect("ban");

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      return names;
   }
   
   protected Channel createChannel(Object id) throws Exception
   {
      Channel c = null;
      if (isMuxChannelUsed())
      {
         for (int i = 0; i < muxFactory.length; i++)
         {
            if (!muxFactory[i].hasMuxChannel(MUX_CHANNEL_CONFIG_STACK_NAME, id.toString()))

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         return createChannel(configFile, channelOptions);
      }


      protected Channel createChannel(String configFile, Map channelOptions) throws Exception
      {
         Channel ch = null;
         log.info("Using configuration file " + configFile);
         ch = new JChannel(configFile);
         for (Iterator iter = channelOptions.keySet().iterator(); iter.hasNext();)
         {
            Integer key = (Integer) iter.next();
            Object value = channelOptions.get(key);
            ch.setOpt(key.intValue(), value);
         }
         return ch;
      }

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         this.f = f;         
      }


      public Channel createChannel(Object id) throws Exception
      {
         Channel c = f.createMultiplexerChannel(MUX_CHANNEL_CONFIG_STACK_NAME, id.toString());
         if(useBlocking())
         {
            c.setOpt(Channel.BLOCK, Boolean.TRUE);
         }
         Address address = c.getLocalAddress(); 
         String append = "[" + id + "]" + " using " + MUX_CHANNEL_CONFIG + ",stack " + MUX_CHANNEL_CONFIG_STACK_NAME;
         if (address == null)
         {
            log.info("Created unconnected mux channel " + append);
         }

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      receiver.clear();
   }  


   protected Channel createChannel() throws ChannelException
   {
      Channel ret = new JChannel(CHANNEL_CONFIG);
      ret.setOpt(Channel.BLOCK, Boolean.TRUE);
      Protocol flush = ((JChannel) ret).getProtocolStack().findProtocol("FLUSH");
      if (flush != null)
      {
         Properties p = new Properties();
         p.setProperty("timeout", "0");

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      }
      
      public void verify(Object verifiable)
      {
         Collection channels = (Collection) verifiable;
         Channel ch = app.getChannel();
         assertFalse("Channel open", ch.isOpen());
         assertFalse("Chnanel connected", ch.isConnected());


         //if this channel had more than one member then verify that 
         //the other member does not have departed member in its view
         if (viewBeforeClose.getMembers().size() > 1)
         {
            for (Iterator iter = channels.iterator(); iter.hasNext();)
            {
               FlushTestReceiver receiver = (FlushTestReceiver) iter.next();
               Channel channel = receiver.getChannel();
               boolean pairServiceFound = (receiver.isUsingMuxChannel() && muxId.equals(((MuxChannel)channel).getId()));               
               if(pairServiceFound || !receiver.isUsingMuxChannel())
               {
                  assertTrue("Removed from view, address " + appAddress + " view is " + channel.getView(), 
                     !channel.getView().getMembers().contains(appAddress));
               }
            }
         }
      }

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