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

      {
         Collection channels = (Collection) verifiable;
         for (Iterator iter = channels.iterator(); iter.hasNext();)
         {
            FlushTestReceiver receiver = (FlushTestReceiver) iter.next();
            Channel ch = receiver.getChannel();
            assertEquals("Correct view",ch.getView().getMembers().size(),expectedViewSize);
            assertTrue("Channel open",ch.isOpen());
            assertTrue("Chnanel connected",ch.isConnected());       
            assertNotNull("Valid address ", ch.getLocalAddress());
            assertTrue("Address included in view ", ch.getView().getMembers().contains(ch.getLocalAddress()));
            assertNotNull("Valid cluster name ", ch.getClusterName());
         }
         
         
         //verify views for pair services created on top of different "real" channels
         if(expectedViewSize>1 && isMuxChannelUsed())
         {            
            for (Iterator iter = channels.iterator(); iter.hasNext();)
            {
               FlushTestReceiver receiver = (FlushTestReceiver) iter.next();
               MuxChannel ch = (MuxChannel)receiver.getChannel();
               int servicePairs = 1;
               for (Iterator it = channels.iterator(); it.hasNext();)
               {        
                  FlushTestReceiver receiver2 = (FlushTestReceiver)  it.next();
                  MuxChannel ch2 = (MuxChannel)receiver2.getChannel();
                  if(ch.getId().equals(ch2.getId()) && !ch.getLocalAddress().equals(ch2.getLocalAddress()))
                  {                     
                     assertEquals("Correct view for service pair",ch.getView(),ch2.getView());
                     assertTrue("Presence in view",ch.getView().getMembers().contains(ch.getLocalAddress()));
                     assertTrue("Presence in view",ch.getView().getMembers().contains(ch2.getLocalAddress()));
                     assertTrue("Presence in view",ch2.getView().getMembers().contains(ch2.getLocalAddress()));
                     assertTrue("Presence in view",ch2.getView().getMembers().contains(ch.getLocalAddress()));
                     servicePairs++;                    
                  }
               }
               assertEquals("Correct service count",expectedViewSize,servicePairs);                            
            }

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      }
   }


   public void testBasicStateSync() throws Exception {


      Channel channel = new JChannel(CHANNEL_PROPS);
      channel.setOpt(Channel.LOCAL, Boolean.FALSE);


      channel.connect(GROUP_NAME);


      Thread.sleep(1000);


      boolean join = false;
      join = channel.getState(null, 100000l);
      assertTrue(join);


      Object tmp;
      int cnt = -1;
      while (true) {
         try {
            tmp = channel.receive(0);
            if (tmp instanceof ExitEvent) {
               break;
            }
            if (tmp instanceof SetStateEvent) {
               cnt = ((Integer) Util.objectFromByteBuffer(((SetStateEvent) tmp).getArg())).intValue();
               System.err.println("--  SetStateEvent, cnt=" + cnt);
               continue;
            }
            if ( tmp instanceof Message ) {
               if (cnt != -1) {
                  int msg = ((Integer) ((Message) tmp).getObject()).intValue();
                  assertEquals(cnt, msg - 1);
                  break;  // done
               }
            }
         } catch (ChannelNotConnectedException not) {
            break;
         } catch (ChannelClosedException closed) {
            break;
         } catch (Exception e) {
            System.err.println(e);
         }
      }


      channel.close();
   }

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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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   // ChannelSource -------------------------------------------------


   public Channel getChannel()
   {
      Channel result = null;
      if (cache != null)
      {
         result = cache.getConfiguration().getRuntimeConfig().getChannel();
      }
      return result;

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    * @param members
    * @return
    */
   private List<Address> checkBuddyStatus(List<Address> members)
   {
      Channel ch = configuration.getRuntimeConfig().getChannel();
      View currentView = ch.getView();
      List<Address> deadBuddies = new LinkedList<Address>();
      for (Address a : members) if (!currentView.containsMember(a)) deadBuddies.add(a);
      return deadBuddies;
   }

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      RuntimeConfig rtcfg = cfg.getRuntimeConfig();


      // Only inject if there isn't already a channel or factory
      if (rtcfg.getMuxChannelFactory() == null && rtcfg.getChannel() == null)
      {
         Channel ch;
         try
         {
            ch = multiplexerService.createMultiplexerChannel(cfg.getMultiplexerStack(), cfg.getClusterName());
         }
         catch (Exception e)

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   }
   
   private void configureMuxUpHandlerChannel(Cache<?, ?> cache) throws Exception
   {
      RuntimeConfig rc = cache.getConfiguration().getRuntimeConfig();
      Channel channel = rc.getChannel();
      
         if (channel == null)      
         {
            // TODO we could deal with other JBC mechanisms of configuring Channels, but in
            // reality the AS use cases that want MuxUpHandler shouldn't configure their
            // JBC that way
            ChannelFactory cf = rc.getMuxChannelFactory();
            if (cf == null)
            {
               log.debug("Cache " + cache.getConfiguration().getClusterName() + 
                     " does not have a ChannelFactory injected so MuxUpHandler cannot be integrated");
            }
            String stack = cache.getConfiguration().getMuxStackName();
            if (stack == null)
            {
               log.debug("Cache " + cache.getConfiguration().getClusterName() + 
                     " does not have a MuxStackName configured so MuxUpHandler cannot be integrated");
            }
            if (cf != null && stack != null)
            {
               // This doesn't result in JMX reg of channel               
               //channel = cf.createChannel(stack);
               channel = cf.createMultiplexerChannel(stack, cache.getConfiguration().getClusterName());
               rc.setChannel(new MuxHandlerChannel((JChannel) channel));
            }
         }
         else if (channel.getUpHandler() == null)
         {
            // replace
            rc.setChannel(new MuxHandlerChannel((JChannel) channel));
         }
         // else the Channel was injected and already had a handler -- shouldn't happen

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   /**
    * {@inheritDoc}
    */
   protected Channel createChannel() throws Exception
   {
      Channel channel = new JChannel(configurator);
      channel.setOpt(Channel.AUTO_RECONNECT, true);
      return channel;
   }

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    * @param members
    * @return
    */
   private List<Address> checkBuddyStatus(List<Address> members)
   {
      Channel ch = configuration.getRuntimeConfig().getChannel();
      View currentView = ch.getView();
      List<Address> deadBuddies = new LinkedList<Address>();
      for (Address a : members) if (!currentView.containsMember(a)) deadBuddies.add(a);
      return deadBuddies;
   }

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