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

      return oldValue;
   }


   public void rollback()
   {
      NodeSPI n = dataContainer.peek(fqn, false, false);
      if (n == null) throw new CacheException("node " + fqn + " not found for rollback!");
      if (oldValue == null)
      {
         n.removeDirect(key);
      }
      else
      {
         n.putDirect(key, oldValue);
      }
   }

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   @Override
   public Object perform(InvocationContext ctx)
   {
      if (globalTransaction != null)
      {
         NodeSPI n = ctx.lookUpNode(fqn);
         originalData = n == null ? null : new HashMap(n.getDataDirect());
      }
      return super.perform(ctx);
   }

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   public void rollback()
   {
      if (trace) log.trace("rollback(" + globalTransaction + ", \"" + fqn + "\", " + originalData + ")");
      if (originalData != null && !originalData.isEmpty())
      {
         NodeSPI nodeSpi = dataContainer.peek(fqn, false, true);
         if (nodeSpi == null)
         {
            if (trace)
               log.trace("Not rolling back node clearance for node: " + fqn + " as it does not exist in the cache. " +
                     "This might be the result of an NoOp clear operation");
            return;
         }
         nodeSpi.putAllDirect(originalData);
      }
   }

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   @Override
   public Object perform(InvocationContext ctx)
   {
      // first get a hold of existing data.
      NodeSPI node = ctx.lookUpNode(fqn);
      Map existingData = node == null ? null : node.getDataDirect();
      if (existingData != null && !existingData.isEmpty())
      {
         oldData = new HashMap(existingData); // defensive copy
      }
      return super.perform(ctx);

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   }


   public void rollback()
   {
      if (trace) log.trace("rollback(" + globalTransaction + ", " + fqn + ", " + data + ")");
      NodeSPI n = dataContainer.peek(fqn, false, true);
      if (n != null)
      {
         n.clearDataDirect();
         if (oldData != null) n.putAllDirect(oldData);
      }
   }

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    */
   public Object perform(InvocationContext ctx)
   {
      if (trace) log.trace("perform(" + globalTransaction + ", \"" + fqn + "\")");


      NodeSPI targetNode = peekVersioned(ctx);
      if (targetNode == null)
      {
         log.warn("node " + fqn + " not found");
         return null;
      }


      Map data = targetNode.getDataDirect();
      notifier.notifyNodeModified(fqn, true, NodeModifiedEvent.ModificationType.REMOVE_DATA, data, ctx);
      targetNode.clearDataDirect();
      notifier.notifyNodeModified(fqn, false, NodeModifiedEvent.ModificationType.REMOVE_DATA, data, ctx);
      return null;
   }

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      return oldValue;
   }


   public void rollback()
   {
      NodeSPI n = dataContainer.peek(fqn, false, false);
      if (n == null) throw new CacheException("node " + fqn + " not found for rollback!");
      if (oldValue == null)
      {
         n.removeDirect(key);
      }
      else
      {
         n.putDirect(key, oldValue);
      }
   }

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   public void rollback()
   {
      if (oldValue != null)
      {
         NodeSPI targetNode = dataContainer.peek(fqn, false, true);
         if (targetNode != null) targetNode.putDirect(key, oldValue);
      }
   }

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    */
   public Object perform(InvocationContext ctx)
   {
      if (trace) log.trace("perform(" + globalTransaction + ", \"" + fqn + "\", key=" + key + ")");


      NodeSPI n = ctx.lookUpNode(fqn);
      if (n == null)
      {
         if (log.isDebugEnabled()) log.debug("node " + fqn + " not found");
         return null;
      }
      if (notifier.shouldNotifyOnNodeModified())
      {
         notifier.notifyNodeModified(fqn, true, NodeModifiedEvent.ModificationType.REMOVE_DATA, n.getDataDirect(), ctx);
      }
      Object oldValue = n.removeDirect(key);
      if (notifier.shouldNotifyOnNodeModified())
      {
         Map removedData = Collections.singletonMap(key, oldValue);
         notifier.notifyNodeModified(fqn, false, NodeModifiedEvent.ModificationType.REMOVE_DATA, removedData, ctx);
      }

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    * @param ctx invocation context
    * @return null
    */
   public Object perform(InvocationContext ctx)
   {
      NodeSPI node = enforceNodeLoading();
      if (trace) log.trace("Invalidating fqn:" + fqn);
      if (node == null)
      {
         return null;
      }

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