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

    * @return a reference to the DELAY instance being used by the JGroups stack
    * @throws Exception
    */
   public static DELAY setDelayForCache(Cache<?, ?> cache, int in_delay_millis, int out_delay_millis) throws Exception {
      JGroupsTransport jgt = (JGroupsTransport) TestingUtil.extractComponent(cache, Transport.class);
      Channel ch = jgt.getChannel();
      ProtocolStack ps = ch.getProtocolStack();
      DELAY delay = (DELAY) ps.findProtocol(DELAY.class);
      if (delay==null) {
         delay = new DELAY();
         ps.insertProtocol(delay, ProtocolStack.ABOVE, TP.class);
      }

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      return values;
   }


   public static DISCARD getDiscardForCache(Cache<?, ?> c) throws Exception {
      JGroupsTransport jgt = (JGroupsTransport) TestingUtil.extractComponent(c, Transport.class);
      Channel ch = jgt.getChannel();
      ProtocolStack ps = ch.getProtocolStack();
      DISCARD discard = new DISCARD();
      ps.insertProtocol(discard, ProtocolStack.ABOVE, TP.class);
      return discard;
   }

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    * @return a reference to the DELAY instance being used by the JGroups stack
    * @throws Exception
    */
   public static DELAY setDelayForCache(Cache<?, ?> cache, int in_delay_millis, int out_delay_millis) throws Exception {
      JGroupsTransport jgt = (JGroupsTransport) TestingUtil.extractComponent(cache, Transport.class);
      Channel ch = jgt.getChannel();
      ProtocolStack ps = ch.getProtocolStack();
      DELAY delay = new DELAY();
      delay.setInDelay(in_delay_millis);
      delay.setOutDelay(out_delay_millis);
      ps.insertProtocol(delay, ProtocolStack.ABOVE, TP.class);
      return delay;

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      cache1.put("k1", "v1");
      assert "v1".equals(cache1.get("k1"));


      // create a new jgroups channel that will join the cluster
      // but without attaching the Infinispan RpcDispatcher
      Channel channel2 = createJGroupsChannel(manager(0).getGlobalConfiguration());
      try {
         // try the put operation again
         cache1.put("k2", "v2");
         assert "v2".equals(cache1.get("k2"));


         // create a new cache, make sure it joins properly
         Configuration c = getDefaultClusteredConfig(cacheMode);
         c.fluent()
               .clustering().stateRetrieval().fetchInMemoryState(true);
         EmbeddedCacheManager cm = addClusterEnabledCacheManager(new TransportFlags());
         cm.defineConfiguration(cacheName, c);
         Cache cache2 = cm.getCache(cacheName);
         assert cache2.getAdvancedCache().getRpcManager().getTransport().getMembers().size() == 3;


         assert "v1".equals(cache1.get("k1"));
         assert "v2".equals(cache1.get("k2"));
         cache1.put("k1", "v1_2");
         cache2.put("k2", "v2_2");
         assert "v1_2".equals(cache1.get("k1"));
         assert "v2_2".equals(cache1.get("k2"));
      } finally {
         channel2.close();
      }
   }

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            ServiceController<?> controller = registry.getRequiredService(serviceName);
            controller.setMode(ServiceController.Mode.ACTIVE);
            try {
                ChannelFactory factory = ServiceContainerHelper.getValue(controller, ChannelFactory.class);
                // Create a temporary channel, but don't connect it
                Channel channel = factory.createChannel(UUID.randomUUID().toString());
                try {
                    // ProtocolStack.printProtocolSpecAsXML() is very hacky and only works on an uninitialized stack
                    List<Protocol> protocols = channel.getProtocolStack().getProtocols();
                    Collections.reverse(protocols);
                    ProtocolStack stack = new ProtocolStack();
                    stack.addProtocols(protocols);
                    context.getResult().set(stack.printProtocolSpecAsXML());
                    context.completeStep(OperationContext.RollbackHandler.NOOP_ROLLBACK_HANDLER);
                } finally {
                    channel.close();
                }
            } finally {
                controller.setMode(ServiceController.Mode.ON_DEMAND);
            }
        } catch (Exception e) {

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   * @see net.sf.hajdbc.Lifecycle#start()
   */
  @Override
  public void start() throws Exception
  {
    Channel channel = this.dispatcher.getChannel();
    
    channel.setDiscardOwnMessages(true);
    
    // Connect and fetch state
    channel.connect(this.id, null, 0);
  }

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   * @see net.sf.hajdbc.Lifecycle#stop()
   */
  @Override
  public void stop()
  {
    Channel channel = this.dispatcher.getChannel();
    
    if (channel.isOpen())
    {
      if (channel.isConnected())
      {
        channel.disconnect();
      }
      
      channel.close();
    }
  }

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


        final Channel ch1, ch2;
        ch1=factory.createMultiplexerChannel(stack_name, "id-1");
        Draw draw1=new Draw(ch1, state, 5000);        


        ch2=factory.createMultiplexerChannel(stack_name, "id-2");
        Draw draw2=new Draw(ch2, state, 5000);

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        Util.printThreads();
    }


    public void testCreationAndClose() throws Exception {
        System.out.println("-- creating channel1 --");
        Channel c = null;
        c = createChannel();
        c.connect("CloseTest1");
        assertTrue("channel open", c.isOpen());
        assertTrue("channel connected", c.isConnected());        
        c.close();        
        assertFalse("channel not connected", c.isConnected());
        c.close();
    }

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    protected void setUp() throws Exception {
        super.setUp();
        System.out.println("#### Setup Test " + testCount);


        Channel c1=createChannel("A");
        this.map1=new DistributedHashtable(c1, false, 5000);
        c1.connect("demo");
        this.map1.start(5000);


        Channel c2=createChannel("A");
        this.map2=new DistributedHashtable(c2, false, 5000);
        c2.connect("demo");
        this.map2.start(5000);
    }

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