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 (hasAdds)
      {
         statusCheckRequired = true;
      }
      
      DistributedReplicantManager drm  = partition.getDistributedReplicantManager();
      this.coordinator = drm.isMasterReplica(getServiceHAName());
      
      if (wasCoordinator && !coordinator)
      {
         // There's been a merge and we are no longer coordinator. Asynchronously
         // tell the rest of the cluster about our knowledge of timestamps

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      this.lockSupport.start();
      
      this.partition.registerRPCHandler(getServiceHAName(), rpcTarget);
      
      DistributedReplicantManager drm = this.partition.getDistributedReplicantManager();
      drm.add(getServiceHAName(), this.partition.getClusterNode());
      this.serviceView = drm.lookupReplicantsNodes(getServiceHAName());
      drm.registerListener(getServiceHAName(), drmListener);
      
      this.initialized = true;
   }

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      this.initialized = true;
   }
   
   public void shutdown() throws Exception
   {
      DistributedReplicantManager drm = this.partition.getDistributedReplicantManager();
      drm.unregisterListener(getServiceHAName(), drmListener);
      drm.remove(getServiceHAName());
      this.partition.unregisterRPCHandler(getServiceHAName(), rpcTarget);
      this.lockSupport.stop();
      
      this.contentManager = null;

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    * DistributedState to see if we can remove/narrow the synchronization. 
    */
   public synchronized void replicantsChanged(String key, java.util.List newReplicants, int newReplicantsViewId,
         boolean merge)
   {
      DistributedReplicantManager drm = this.partition.getDistributedReplicantManager();
      
      if (key.equals(this.RPC_HANDLER_NAME) && drm.isMasterReplica(this.RPC_HANDLER_NAME))
      {
         this.log.debug("The list of replicants for the JG bridge has changed, computing and updating local info...");


         DistributedState ds = this.partition.getDistributedStateService();
         
         // we remove any entry from the DS whose node is dead
         //
         java.util.Collection coll = ds.getAllKeys(this.RPC_HANDLER_NAME);
         if (coll == null)
         {
            this.log.debug("... No bridge info was associated with this node");
            return;
         }


         // to avoid ConcurrentModificationException, we copy the list of keys in a new structure
         //
         ArrayList collCopy = new java.util.ArrayList(coll);
         java.util.List newReplicantsNodeNames = drm.lookupReplicantsNodeNames(this.RPC_HANDLER_NAME);


         for (int i = 0; i < collCopy.size(); i++)
         {
            String nodeEntry = (String) collCopy.get(i);
            if (!newReplicantsNodeNames.contains(nodeEntry))

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      if (this.partition == null)
         throw new IllegalStateException("HAPartition property must be set before starting InvalidationBridge service");


      this.RPC_HANDLER_NAME = "DCacheBridge-" + this.bridgeName;


      DistributedReplicantManager drm = this.partition.getDistributedReplicantManager();
      DistributedState ds = this.partition.getDistributedStateService();
      
      drm.add(this.RPC_HANDLER_NAME, "");
      drm.registerListener(this.RPC_HANDLER_NAME, this);
      ds.registerDSListenerEx(this.RPC_HANDLER_NAME, this);
      this.partition.registerRPCHandler(this.RPC_HANDLER_NAME, this);


      // we now publish the list of caches we have access to
      if (this.invalMgr == null)

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   }


   @Override
   public void stopService()
   {
      DistributedReplicantManager drm = this.partition.getDistributedReplicantManager();
      DistributedState ds = this.partition.getDistributedStateService();
      
      try
      {
         this.partition.unregisterRPCHandler(this.RPC_HANDLER_NAME, this);
         ds.unregisterDSListenerEx(this.RPC_HANDLER_NAME, this);
         drm.unregisterListener(this.RPC_HANDLER_NAME, this);
         drm.remove(this.RPC_HANDLER_NAME);


         this.invalidationSubscription.unregister();


         ds.remove(this.RPC_HANDLER_NAME, this.partition.getNodeName(), true);

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