Examples of org.jboss.cache.NodeSPI

org.jboss.cache.NodeSPI
A more detailed interface to {@link Node}, which is used when writing plugins for or extending JBoss Cache. References are usually obtained by calling methods on {@link org.jboss.cache.CacheSPI}.
You should NEVER attempt to directly cast a {@link Node} instance to this interface. In future, the implementation may not allow it.
This interface contains overridden method signatures of some methods from {@link Node}, overridden to ensure return types of {@link Node} are replaced with {@link NodeSPI}.
An important note on the xxxDirect() methods below. These methods are counterparts to similarly named methods in {@link Node} - e.g., {@link NodeSPI#getDirect(Object)} is a direct access counterpart to {@link Node#get(Object)}, the difference being that:
- {@link Node#get(Object)} - Passes the call up the interceptor stack, applies all aspects including node locking, cache loading, passivation, etc etc.
- {@link NodeSPI#getDirect(Object)} - directly works on the underlying data in the node.
The big difference with the direct access methods are that it is the onus of the caller to ensure proper locks are obtained prior to the call. A proper call should have gone through a locking-capable interceptor first and based on the cache configuration's locking policy, an appropriate lock should be obtained prior to the call. These direct access methods will throw {@link org.jboss.cache.lock.LockingException}s if appropriate locks haven't been obtained by the caller.
It is important to node that the direct read methods, such as getDataDirect(), return unmodifiable collections. In addition to being unmodifiable, they are also defensively copied from the underlying data map to ensure view consistency.
@author Manik Surtani (manik AT jboss DOT org) @see Node @see org.jboss.cache.CacheSPI @since 2.0.0


         Map attrs = nd.getAttributes();


         // We handle this NodeData.  Create a TreeNode and
         // integrate its data
         NodeSPI target;
         if (usePut)
         {
            cache.getInvocationContext().getOptionOverrides().setCacheModeLocal(true);
            cache.getInvocationContext().getOptionOverrides().setSkipCacheStatusCheck(true);
            cache.clearData(fqn);

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   private void integrateRetainedNode(NodeSPI ancestor, Node descendant)
   {
      Fqn descFqn = descendant.getFqn();
      Fqn ancFqn = ancestor.getFqn();
      Object name = descFqn.get(ancFqn.size());
      NodeSPI child = (NodeSPI) ancestor.getChild(name);
      if (ancFqn.size() == descFqn.size() + 1)
      {
         if (child == null)
         {
            ancestor.addChild(name, descendant);

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      if (commit)
      {
         while (it.hasPrevious())
         {
            Fqn f = it.previous();
            NodeSPI rcn = ctx.lookUpNode(f);
            // could be null with read-committed
            if (rcn != null) rcn.commitUpdate(ctx, dataContainer);
            // and then unlock
            if (trace) log.trace("Releasing lock on [" + f + "] for owner " + owner);
            lockManager.unlock(f, owner);
         }
      }
      else
      {
         while (it.hasPrevious())
         {
            Fqn f = it.previous();
            NodeSPI rcn = ctx.lookUpNode(f);
            // could be null with read-committed
            if (rcn != null) rcn.rollbackUpdate();
            // and then unlock
            if (trace) log.trace("Releasing lock on [" + f + "] for owner " + owner);
            lockManager.unlock(f, owner);
         }
      }

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   }


   @SuppressWarnings("unchecked")
   private Long getExpiration(Fqn fqn)
   {
      NodeSPI n = cache.peek(fqn, false);
      if (n == null)
         return null;
      return (Long) n.getDirect(config.getExpirationKeyName());
   }

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      public void run()
      {
         int op;
         Fqn fqn;
         Object key, val, retval;
         NodeSPI n;
         boolean flag;


         while (t != null && t.equals(Thread.currentThread()) && t.isAlive())
         {
            try
            {
               if (trace) log.trace("Reading next byte");
               op = input.readByte();
            }
            catch (IOException e)
            {
               log.debug("Client closed socket");
               close();
               break;
            }


            try
            {
               if (trace) log.trace("Resetting output");
               output.reset();
               switch (op)
               {
                  case TcpCacheOperations.GET_CHILDREN_NAMES:
                     fqn = (Fqn) input.readObject();
                     Node node = c.getRoot().getChild(fqn);
                     Set<Object> children = node == null ? Collections.emptySet() : node.getChildrenNames();
                     output.writeObject(children);
                     break;
                  case TcpCacheOperations.GET_KEY:
                     fqn = (Fqn) input.readObject();
                     key = input.readObject();
                     retval = c.get(fqn, key);
                     output.writeObject(retval);
                     break;
                  case TcpCacheOperations.GET:
                     fqn = (Fqn) input.readObject();
                     n = c.getNode(fqn);
                     if (n == null)
                     {
                        // node doesn't exist - return null
                        output.writeObject(null);
                        break;
                     }
                     Map map = n.getData();
                     if (map == null) map = new HashMap();
                     output.writeObject(map);
                     break;
                  case TcpCacheOperations.EXISTS:
                     fqn = (Fqn) input.readObject();

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   {
      if ((ctx.isLockingSuppressed()) || configuration.getIsolationLevel() == IsolationLevel.NONE)
      {
         if (trace) log.trace("Suppressing locking, creating nodes if necessary");
         int treeNodeSize = command.getFqn().size();
         NodeSPI n = dataContainer.getRoot();
         for (int i = 0; i < treeNodeSize; i++)
         {
            Object childName = command.getFqn().get(i);
            Fqn childFqn = Fqn.fromElements(childName);
            NodeSPI childNode = n.getChildDirect(childFqn);
            if (childNode == null) childNode = n.addChildDirect(childFqn);
            LockUtil.manageReverseRemove(ctx, childNode, true, null, commandsFactory);
            n = childNode;
         }
      }

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      Object retValue = invokeNextInterceptor(ctx, command);


      if (ctx.getTransaction() == null) // not transactional
      {
         // do a REAL remove here.
         NodeSPI n = dataContainer.peek(command.getFqn(), true, false);
         if (n != null) lockManager.unlockAll(n, Thread.currentThread());
      }


      return retValue;
   }

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      if (ctx.getGlobalTransaction() == null)
      {
         for (NodeSPI nodeSPI : createdNodes) dataContainer.removeFromDataStructure(nodeSPI.getFqn(), true);
         dataContainer.removeFromDataStructure(command.getFqn(), true);


         NodeSPI n = dataContainer.peek(command.getFqn(), true, false);
         if (n != null) lockManager.unlockAll(n, Thread.currentThread());
      }
      // if this is a delete op and we had to create the node, return a FALSE as nothing *really* was deleted!
      return created ? false : retVal;
   }

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    * AND it was found in the cache loader (nodeLoaded = true).
    * Then notify the listeners that the node has been activated.
    */
   private void removeNodeFromCacheLoader(Fqn fqn) throws Throwable
   {
      NodeSPI n;
      if (((n = dataContainer.peek(fqn, true, false)) != null) && n.isDataLoaded() && loader.exists(fqn))
      {
         // node not null and attributes have been loaded?
         if (!n.getChildrenDirect().isEmpty())
         {
            boolean result = childrenLoaded(n);
            if (result)
            {
               log.debug("children all initialized");

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      private void handlePutCommand(InvocationContext ctx, Fqn fqn)
            throws Exception
      {
         if (fqn != null && dataContainer.peek(fqn, false, false) != null && loader.exists(fqn))
         {
            NodeSPI n = dataContainer.peek(fqn, true, false);// don't load
            // node not null and attributes have been loaded?
            if (n != null && n.isDataLoaded())
            {
               // has children?
               boolean result = childrenLoaded(n);
               if (!n.getChildrenDirect().isEmpty() && result)
               {
                  // children have been loaded, remove the node
                  addRemoveMod(ctx, cacheLoaderModifications, fqn, n.getDataDirect());
                  txActs++;
               }
               // doesn't have children, check the cache loader
               else if (loaderNoChildren(fqn))
               {
                  addRemoveMod(ctx, cacheLoaderModifications, fqn, n.getDataDirect());
                  txActs++;
               }
            }
         }
      }

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