Examples of org.jboss.ha.framework.interfaces.DistributedReplicantManager

Package org.jboss.ha.framework.interfaces

Examples of org.jboss.ha.framework.interfaces.DistributedReplicantManager

org.jboss.ha.framework.interfaces.DistributedReplicantManager
DistributedReplicantManager is a service on top of {@link HAPartition} that provides acluster-wide distributed state which is node-specific. The DistributedReplicantManager (DRM) service provides a <String key, Serializable replicant> tuple map. Each node in the cluster stores its own data for a given key. This data is replicated so that reading values for a key is always performed locally.
Typical usages for DistributedReplicantManager are:
1. To serve as a distributed registry for remote service endpoints for clustered services. In this usage, the Serializable replicants that services store in the DRM are information (e.g. RMI stubs, JBoss Remoting InvokerLocator instances, HTTP URLs etc) that remote clients would need to contact the clustered service. This usage of DRM drives the smart clustered proxy implementations used by JBoss AS.
2. To simply serve as a distributed registry showing on what cluster nodes particular services are deployed. Here the Serializable replicants that services store in the DRM are usually just simple placeholder strings; the presence of the tuple itself is what indicates the service is available on a particular node. This usage of DRM drives JBoss AS services like HASingleton.
@author Bill Burke. @author Sacha Labourey. @author Brian Stansberry @author Galder Zamarreno @version $Revision: 69398 $
Revisions:

2001/10/31: marcf
1. DRM is no longer remote
2002/08/23: Sacha Labourey
1. added isMasterReplica

    * @see org.jboss.ha.framework.server.HAServiceImpl#registerDRMListener()
    */
   @Override
   protected void registerDRMListener() throws Exception
   {
      DistributedReplicantManager drm = this.getHAPartition().getDistributedReplicantManager();
      
      final String key = this.getHAServiceKey();
      
      // Temporary drm listener
      RecordingReplicantListener listener = new RecordingReplicantListener();
      
      // record replicant changes, but don't handle them just yet
      drm.registerListener(key, listener);


      // this ensures that the DRM knows that this node has the singleton deployed
      drm.add(key, this.getReplicant());
      
      // Now register the real listener
      drm.registerListener(key, this);
      
      // ...and unregister our temporary one
      drm.unregisterListener(key, listener);
      
      ReplicantView view = this.viewReference.getAndSet(null);
      
      // Process the recorded replicant change
      // Typically this will be the replicant change from drm.add(...)

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      this.callAsyncMethodOnPartition("stopOldMaster", new Object[0], new Class[0]);
   }


   protected boolean isDRMMasterReplica()
   {
      DistributedReplicantManager drm = this.getHAPartition().getDistributedReplicantManager();


      return drm.isMasterReplica(this.getHAServiceKey());
   }

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   protected void updateHAPartition(HAPartition partition) throws Exception
   {
      cleanExistenceInCurrentHAPartition();
      
      this.partition = partition;
      DistributedReplicantManager drm = partition.getDistributedReplicantManager();
      drm.registerListener(this.replicantName, this);
      drm.add(this.replicantName, this.target);
   }

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   {
      if (this.partition != null)
      {
         try
         {
            DistributedReplicantManager drm = partition.getDistributedReplicantManager();
            drm.unregisterListener(this.replicantName, this);
            drm.remove(this.replicantName);         
         } 
         catch (Exception e)
         {
            log.error("failed to clean existence in current ha partition", e);
         }

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   public void updateHAPartition(HAPartition partition) throws Exception
   {
      cleanExistenceInCurrentHAPartition();
      
      this.partition = partition;
      DistributedReplicantManager drm = partition.getDistributedReplicantManager();
      drm.registerListener(this.replicantName, this);
      drm.add(this.replicantName, this.target);
   }

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   {
      if (this.partition != null)
      {
         try
         {
            DistributedReplicantManager drm = partition.getDistributedReplicantManager();
            drm.unregisterListener(this.replicantName, this);
            drm.remove(this.replicantName);         
         } 
         catch (Exception e)
         {
            log.error("failed to clean existence in current ha partition", e);
         }

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         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

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   protected void updateHAPartition(HAPartition partition) throws Exception
   {
      cleanExistenceInCurrentHAPartition();
      
      this.partition = partition;
      DistributedReplicantManager drm = partition.getDistributedReplicantManager();
      drm.registerListener(this.replicantName, this);
      drm.add(this.replicantName, this.target);
   }

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   {
      if (this.partition != null)
      {
         try
         {
            DistributedReplicantManager drm = partition.getDistributedReplicantManager();
            drm.unregisterListener(this.replicantName, this);
            drm.remove(this.replicantName);         
         } 
         catch (Exception e)
         {
            log.error("failed to clean existence in current ha partition", e);
         }

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   protected void updateHAPartition(HAPartition partition) throws Exception
   {
      cleanExistenceInCurrentHAPartition();
      
      this.partition = partition;
      DistributedReplicantManager drm = partition.getDistributedReplicantManager();
      drm.registerListener(this.replicantName, this);
      drm.add(this.replicantName, this.target);
   }

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