Examples of org.jgroups.stack.GossipRouter

org.jgroups.stack.GossipRouter
Router for TCP based group comunication (using layer TCP instead of UDP). Instead of the TCP layer sending packets point-to-point to each other member, it sends the packet to the router which - depending on the target address - multicasts or unicasts it to the group / or single member.
This class is especially interesting for applets which cannot directly make connections (neither UDP nor TCP) to a host different from the one they were loaded from. Therefore, an applet would create a normal channel plus protocol stack, but the bottom layer would have to be the TCP layer which sends all packets point-to-point (over a TCP connection) to the router, which in turn forwards them to their end location(s) (also over TCP). A centralized router would therefore have to be running on the host the applet was loaded from.
An alternative for running JGroups in an applet (IP multicast is not allows in applets as of 1.2), is to use point-to-point UDP communication via the gossip server. However, then the appplet has to be signed which involves additional administrative effort on the part of the user.
Note that a GossipRouter is also a good way of running JGroups in Amazon's EC2 environment which (as of summer 09) doesn't support IP multicasting. @author Bela Ban @author Vladimir Blagojevic @author Ovidiu Feodorov @since 2.1.1

      * bug, which used to leave pbcast.NAKACK in a broken state after
      * DISCONNECT. Because of this problem, the channel couldn't be used to
      * multicast messages.
      **/
     public void testDisconnectConnectSendTwo_TUNNEL() throws Exception {
        GossipRouter router=null;
        try {
            router=new GossipRouter();
            router.start();
            final Promise msgPromise=new Promise();
            JChannel coordinator=createChannel();
            setProps(coordinator);
            coordinator.setReceiver(new PromisedMessageListener(msgPromise));
            coordinator.connect("testgroup");


            channel=createChannel();
            setProps(channel);
            channel.connect("testgroup1");
            channel.disconnect();
            channel.connect("testgroup");


            channel.send(new Message(null, null, "payload"));


            Message msg=(Message)msgPromise.getResult(20000);
            assertNotNull(msg);
            assertEquals("payload", msg.getObject());
            channel.close();
            coordinator.close();
        }
        finally {
            if(router != null){
                router.stop();
                //release ports
                Util.sleep(1000);
            }
        }
    }

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        super(name);
    }


    public void setUp() throws Exception {
        super.setUp();
        router=new GossipRouter();
        router.setExpiryTime(expiryTime);
        router.start();
        client=new GossipClient(new IpAddress("127.0.0.1", 12001), expiryTime);
        client.setRefresherEnabled(false); // don't refresh the registrations
    }

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    }


    public void setUp() throws Exception {
        super.setUp();
        promise=new Promise();
        router=new GossipRouter();
        router.start();
    }

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     * TO_DO: uncomment or delete after clarifying the semantics of
     * getLocalAddress() on a disconnected channel.
     *
     **/
    public void testNullLocalAddress_TUNNEL() throws Exception {
        GossipRouter router=null;
        try {
            router=new GossipRouter();
            router.start();
            channel = createChannel();
            channel.connect("testgroup");
            assertNotNull(channel.getLocalAddress());
            channel.disconnect();
            assertNull(channel.getLocalAddress());
        }
        finally {
            if(router != null)
                router.stop();
        }
    }

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    /**
      * Tests connect-disconnect-connect sequence for a group with one member
      * (using TUNNEL).
      **/
     public void testDisconnectConnectOne_TUNNEL() throws Exception {
        GossipRouter router=null;
        try {
            router=new GossipRouter();
            router.start();
            channel=createChannel();
            channel.connect("testgroup1");
            channel.disconnect();
            channel.connect("testgroup2");
            View view=channel.getView();
            assertEquals(1, view.size());
            assertTrue(view.containsMember(channel.getLocalAddress()));
        }
        finally {
            if(router != null)
                router.stop();
        }
     }

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        }
     }




    public void testConnectTwo_TUNNEL() throws Exception {
        GossipRouter router=null;
         try {
             router=new GossipRouter();
             router.start();
             JChannel coordinator=createChannel();
             setProps(coordinator);
             coordinator.connect("testConnectTwo_TUNNEL");
             channel=createChannel();
             setProps(channel);
             channel.connect("testConnectTwo_TUNNEL");


             View view=channel.getView();
             for(int i=0; i < 10; i++) {
                 if(view.size() >= 2)
                     break;
                 System.out.print(".");
                 Util.sleep(1000);
                 view=channel.getView();
             }


             System.out.println("view = " + view);
             assertEquals(2, view.size());
             assertTrue(view.containsMember(channel.getLocalAddress()));
             assertTrue(view.containsMember(coordinator.getLocalAddress()));
             channel.close();
             coordinator.close();
         }
         finally {
             if(router != null){
                 router.stop();
                 //release ports
                 Util.sleep(1000);
             }
         }
     }

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     /**
      * Tests connect-disconnect-connect sequence for a group with two members
      * (using TUNNEL).
      **/
     public void testDisconnectConnectTwo_TUNNEL() throws Exception {
         GossipRouter router=null;
         try {
             router=new GossipRouter();
             router.start();
             JChannel coordinator=createChannel();
             setProps(coordinator);
             coordinator.connect("testgroup");
             channel=createChannel();
             setProps(channel);
             channel.connect("testgroup1");
             channel.disconnect();
             channel.connect("testgroup");


             View view=channel.getView();
             for(int i=0; i < 10; i++) {
                 if(view.size() >= 2)
                     break;
                 System.out.print(".");
                 Util.sleep(1000);
                 view=channel.getView();
             }


             assertEquals(2, view.size());
             assertTrue(view.containsMember(channel.getLocalAddress()));
             assertTrue(view.containsMember(coordinator.getLocalAddress()));
             channel.close();
             coordinator.close();
         }
         finally {
             if(router != null){
                 router.stop();
                 //release ports
                 Util.sleep(1000);
             }
         }
     }

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    * 
    * @throws Exception
    */
   public void testIsMasterReplica() throws Exception
   {
      GossipRouter router = null;
      ClusterPartition partition1 = null;
      ClusterPartition partition2 = null;
      boolean partition1Started = false;
      boolean partition2Started = false;
      
      log.debug("+++ testIsMasterReplica()");


      try
      {  
         String partitionName = "DRMTestCasePartition";
         String muxFile = "cluster/drm/drm-test-stacks.xml";
         String stackName = "tunnel1";
         
         log.info("DRMTestCase.testIsMasterReplica() - starting GossipRouter");
         // router characteristics here must match the definition in the stack configuration
         router = new GossipRouter(12001, "127.0.0.1");
         router.start();
         Thread.sleep(10000);
         
         JChannelFactory factory1 = new JChannelFactory();
         factory1.setMultiplexerConfig(muxFile);
         factory1.setNamingServicePort(1099);
         factory1.setNodeName("node1");
         factory1.setExposeChannels(false);
         factory1.setExposeProtocols(false);
         factory1.create();
         factory1.start();


         Configuration cacheConfig1 = new Configuration();
         cacheConfig1.setMultiplexerStack(stackName);
         cacheConfig1.setCacheMode("REPL_SYNC");
         
         DependencyInjectedConfigurationRegistry registry1 = new DependencyInjectedConfigurationRegistry();
         registry1.registerConfiguration("config1", cacheConfig1);         
         
         CacheManager cacheManager1 = new CacheManager(registry1, factory1);
         
         HAPartitionCacheHandlerImpl cacheHandler1 = new HAPartitionCacheHandlerImpl();
         cacheHandler1.setCacheManager(cacheManager1);
         cacheHandler1.setCacheConfigName("config1");
         
         DistributedStateImpl ds1 = new DistributedStateImpl();
         ds1.setCacheHandler(cacheHandler1);
         
         partition1 = new ClusterPartition();
         partition1.setPartitionName(partitionName);
         partition1.setCacheHandler(cacheHandler1);
         partition1.setStateTransferTimeout(30000);
         partition1.setMethodCallTimeout(60000);
         partition1.setDistributedStateImpl(ds1);
         partition1.setBindIntoJndi(false);
         
         partition1.create();         
         partition1.start();


         DistributedReplicantManager drm1 = partition1.getDistributedReplicantManager();


         Thread.sleep(10000);
         
         // Use a different stack name with the same config to avoid singleton conflicts
         stackName = "tunnel2";
         
         JChannelFactory factory2 = new JChannelFactory();
         factory2.setMultiplexerConfig(muxFile);
         factory2.setNamingServicePort(1099);
         factory2.setNodeName("node2");
         factory2.setExposeChannels(false);
         factory2.setExposeProtocols(false);
         factory2.create();
         factory2.start();
         
         Configuration cacheConfig2 = new Configuration();
         cacheConfig2.setMultiplexerStack(stackName);
         cacheConfig2.setCacheMode("REPL_SYNC");
         
         DependencyInjectedConfigurationRegistry registry2 = new DependencyInjectedConfigurationRegistry();
         registry2.registerConfiguration("config2", cacheConfig2);         
         
         CacheManager cacheManager2 = new CacheManager(registry2, factory2);
         
         HAPartitionCacheHandlerImpl cacheHandler2 = new HAPartitionCacheHandlerImpl();
         cacheHandler2.setCacheManager(cacheManager2);
         cacheHandler2.setCacheConfigName("config2");
         
         DistributedStateImpl ds2 = new DistributedStateImpl();
         ds2.setCacheHandler(cacheHandler2);
         
         partition2 = new ClusterPartition();
         partition2.setPartitionName(partitionName);
         partition2.setCacheHandler(cacheHandler2);
         partition2.setStateTransferTimeout(30000);
         partition2.setMethodCallTimeout(60000);
         partition2.setDistributedStateImpl(ds2);
         partition2.setBindIntoJndi(false);
         
         partition2.create();         
         partition2.start();


         DistributedReplicantManager drm2 = partition2.getDistributedReplicantManager();
         
         Thread.sleep(10000);
         
         // confirm that each partition contains two nodes   
         assertEquals("Partition1 should contain two nodes; ", 2, partition1.getCurrentView().size());
         assertEquals("Partition2 should contain two nodes; ", 2, partition2.getCurrentView().size());
         
         drm1.add(SERVICEA, "valueA1");
         drm2.add(SERVICEA, "valueA2");
         drm2.add(SERVICEB, "valueB2");
         
         // test that only one node is the master replica for serviceA
         assertTrue("ServiceA must have a master replica", 
                 drm1.isMasterReplica(SERVICEA) || drm2.isMasterReplica(SERVICEA));
         assertTrue("ServiceA must have a single master replica", 
                 drm1.isMasterReplica(SERVICEA) != drm2.isMasterReplica(SERVICEA));
 
         // ServiceB should only be a master replica on partition2
         assertFalse("ServiceB should not be a master replica on partition1", 
                 drm1.isMasterReplica(SERVICEB));
         assertTrue("ServiceB must have a master replica on partition2", 
                 drm2.isMasterReplica(SERVICEB));
         
         // confirm that each partition contains correct DRM replicants for services A and B  
         assertEquals("Partition1 should contain two DRM replicants for serviceA; ", 
                 2, drm1.lookupReplicants(SERVICEA).size());
         assertEquals("Partition2 should contain two DRM replicants for serviceA; ", 
                 2, drm2.lookupReplicants(SERVICEA).size());
         assertEquals("Partition1 should contain one DRM replicant for serviceB; ", 
                 1, drm1.lookupReplicants(SERVICEB).size());
         assertEquals("Partition2 should contain one DRM replicant for serviceB; ", 
                 1, drm2.lookupReplicants(SERVICEB).size());


         // simulate a split of the partition
         log.info("DRMTestCase.testIsMasterReplica() - stopping GossipRouter");
         router.stop();
         sleepThread(15000);
         
         // confirm that each partition contains one node   
         assertEquals("Partition1 should contain one node after split; ", 
                 1, partition1.getCurrentView().size());
         assertEquals("Partition2 should contain one node after split; ", 
                 1, partition2.getCurrentView().size());
        
         // confirm that each node is a master replica for serviceA after the split
         assertTrue("ServiceA should be a master replica on partition1 after split", 
                 drm1.isMasterReplica(SERVICEA));
         assertTrue("ServiceA should be a master replica on partition2 after split", 
                 drm2.isMasterReplica(SERVICEA));
         
         // ServiceB should still only be a master replica on partition2 after split
         assertFalse("ServiceB should not be a master replica on partition1 after split", 
                 drm1.isMasterReplica(SERVICEB));
         assertTrue("ServiceB must have a master replica on partition2 after split", 
                 drm2.isMasterReplica(SERVICEB));
         
         // Remove ServiceA replicant from partition1         
         drm1.remove(SERVICEA);
         
         // test that this node is not the master replica         
         assertFalse("partition1 is not master replica after dropping ServiceA replicant", 
                 drm1.isMasterReplica(SERVICEA));
         
         //Restore the local replicant         
         drm1.add(SERVICEA, "valueA1a");
         
         // simulate a merge
         log.info("DRMTestCase.testIsMasterReplica() - restarting GossipRouter");
         router.start();
         // it seems to take more than 15 seconds for the merge to take effect
         sleepThread(30000);
         
         assertTrue(router.isStarted());


         // confirm that each partition contains two nodes again
         assertEquals("Partition1 should contain two nodes after merge; ", 
               2, partition1.getCurrentView().size());
         assertEquals("Partition2 should contain two nodes after merge; ", 
                 2, partition2.getCurrentView().size());
         
         // test that only one node is the master replica for serviceA after merge
         assertTrue("ServiceA must have a master replica after merge", 
                 drm1.isMasterReplica(SERVICEA) || drm2.isMasterReplica(SERVICEA));
         assertTrue("ServiceA must have a single master replica after merge", 
                 drm1.isMasterReplica(SERVICEA) != drm2.isMasterReplica(SERVICEA));
 
         // ServiceB should only be a master replica on partition2 after merge
         assertFalse("ServiceB should not be a master replica on partition1 after merge", 
                 drm1.isMasterReplica(SERVICEB));
         assertTrue("ServiceB must have a master replica on partition2 after merge", 
                 drm2.isMasterReplica(SERVICEB));
         
         // confirm that each partition contains correct DRM replicants for services A and B after merge 
         assertEquals("Partition1 should contain two DRM replicants for serviceA after merge; ", 
                 2, drm1.lookupReplicants(SERVICEA).size());
         assertEquals("Partition2 should contain two DRM replicants for serviceA after merge; ", 
                 2, drm2.lookupReplicants(SERVICEA).size());
         assertEquals("Partition1 should contain one DRM replicant for serviceB after merge; ", 
                 1, drm1.lookupReplicants(SERVICEB).size());
         assertEquals("Partition2 should contain one DRM replicant for serviceB after merge; ", 
                 1, drm2.lookupReplicants(SERVICEB).size());
         
         partition1.stop();
         partition2.stop();
      }
      finally
      {
         log.info("DRMTestCase.testIsMasterReplica() - cleaning up resources");
         if (partition1Started)
            partition1.stop();
         if (partition2Started)
            partition2.stop();
         if (router != null)
            router.stop();
      }
   }

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   }




   public static void main(String[] args) throws Exception
   {
      GossipRouter router = new GossipRouter(12000, "localhost");
      router.start();


   }

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    public static void main(String[] args) throws Exception {
        // Load the Load factor from the command line or use default 100
        Integer loadFactor = determineLoadFactor();


        // Start the GossipRouter if it is not already running
        GossipRouter gossipRouter = new GossipRouter();
        try {
            gossipRouter.start();
        } catch (BindException e) {
            System.out.println("Gossip router is already started in another JVM instance.");
        }


        // let's start with the local Command Bus that registers the handlers

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