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

   {
      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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      this.partition.unregisterRPCHandler(this.getHAServiceKey(), this.getRpcHandler());
   }
   
   protected void registerDRMListener() throws Exception
   {
      DistributedReplicantManager drm = this.partition.getDistributedReplicantManager();
      
      String key = this.getHAServiceKey();
      
      drm.registerListener(key, this);


      // this ensures that the DRM knows that this node has the MBean deployed
      drm.add(key, this.getReplicant());
   }

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      drm.add(key, this.getReplicant());
   }
   
   protected void unregisterDRMListener() throws Exception
   {
      DistributedReplicantManager drm = this.partition.getDistributedReplicantManager();


      String key = this.getHAServiceKey();
      
      // remove replicant node
      drm.remove(key);
     
      // unregister
      drm.unregisterListener(key, this);
   }

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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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    * @see org.jboss.ha.framework.server.HAServiceImpl#registerDRMListener()
    */
   @Override
   protected void registerDRMListener() throws Exception
   {
      DistributedReplicantManager drm = this.getHAPartition().getDistributedReplicantManager();
      
      // Temporary drm listener
      RecordingReplicantListener listener = new RecordingReplicantListener();
      
      String key = this.getHAServiceKey();
      
      // 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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      this.partition.unregisterRPCHandler(this.getHAServiceKey(), this.getRpcHandler());
   }
   
   protected void registerDRMListener() throws Exception
   {
      DistributedReplicantManager drm = this.partition.getDistributedReplicantManager();
      
      String key = this.getHAServiceKey();
      
      drm.registerListener(key, this);


      // this ensures that the DRM knows that this node has the MBean deployed
      drm.add(key, this.getReplicant());
   }

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