Examples of org.jboss.cache.commands.read.ExistsCommand

org.jboss.cache.commands.read.ExistsCommand
Checks whether a given node exists in current in-memory state of the cache. Does not acquire any locks in doing so (result may be dirty read). Does not attempt to load nodes from a cache loader (may return false if a node has been evicted).
Specifically used by the {@link org.jboss.cache.loader.ClusteredCacheLoader} toimplement {@link org.jboss.cache.loader.CacheLoader#exists(org.jboss.cache.Fqn)}
This is the equivalent of the old MethodCallDefinitions.existsMethod method call from 2.1.x.
@author Mircea.Markus@jboss.com @since 2.2.0

   {
      if (usingMvcc)
      {
         InvocationContext ctx = invocationContextContainer.get();
         cacheStatusCheck(ctx);
         ExistsCommand command = commandsFactory.buildExistsNodeCommand(fqn);
         return (Boolean) invoker.invoke(ctx, command);
      }
      else
      {
         return peek(fqn, false) != null;

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      return command;
   }


   public ExistsCommand buildExistsNodeCommand(Fqn fqn)
   {
      ExistsCommand command = new ExistsCommand(fqn);
      command.initialize(dataContainer);
      return command;
   }

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      ReplicableCommand command;
      switch (id)
      {
         case ExistsCommand.METHOD_ID:
         {
            ExistsCommand result = new ExistsCommand();
            result.initialize(dataContainer);
            command = result;
            break;
         }
         case GetChildrenNamesCommand.METHOD_ID:
         {

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   {
      if (usingMvcc)
      {
         InvocationContext ctx = invocationContextContainer.get();
         cacheStatusCheck(ctx);
         ExistsCommand command = commandsFactory.buildExistsNodeCommand(fqn);
         return (Boolean) invoker.invoke(ctx, command);
      }
      else
      {
         return peek(fqn, false) != null;

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   public boolean exists(Fqn fqn) {
      if (usingMvcc) {
         InvocationContext ctx = invocationContextContainer.get();
         cacheStatusCheck(ctx);
         ExistsCommand command = commandsFactory.buildExistsNodeCommand(fqn);
         return (Boolean) invoker.invoke(ctx, command);
      } else {
         return peek(fqn, false) != null;
      }
   }

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      if (!isCacheReady() || !cache.getInvocationContext().isOriginLocal()) return false;


      lock.acquireLock(name, false);
      try
      {
         ExistsCommand command = commandsFactory.buildExistsNodeCommand(name);
         Object resp = callRemote(command);
         return resp != null && (Boolean) resp;
      }
      finally
      {

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Related Classes of org.jboss.cache.commands.read.ExistsCommand

org.jboss.cache.commands.CommandsFactoryImpl

org.jboss.cache.factories.CommandsFactory

org.jboss.cache.invocation.CacheInvocationDelegate

org.jboss.cache.loader.ClusteredCacheLoader

org.jboss.cache.NodeSPI

org.teiid.cache.jboss.ClusteredTupleBatchCacheLoader

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