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

    * @param ctx invocation context
    * @return a Node, or null if the Fqn refers to a node that does not exist.
    */
   public Object perform(InvocationContext ctx)
   {
      NodeSPI node = ctx.lookUpNode(fqn);
      if (node != null && node.isDeleted())
      {
         if (trace)
            log.trace("Node of type [" + node.getClass().getSimpleName() + "] found but marked as deleted in current scope.  Returning null.");
         return null;
      }
      if (trace) log.trace("Found node, returning " + node);
      return node;
   }

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      Set<Object> childNames = new HashSet<Object>();


      for (InternalNode realChild : children)
      {
         Fqn childFqn = realChild.getFqn();
         NodeSPI childNode = ctx.lookUpNode(childFqn);


         // deletion flag should be checked on what we get from the ctx.
         // if childNode is null then it hasn't been removed in the current scope and hence should be included in this list.
         if (childNode == null || !childNode.isDeleted()) childNames.add(childFqn.getLastElement());
      }


      // now check for any *new* children added.
      for (Map.Entry<Fqn, NodeSPI> n : ctx.getLookedUpNodes().entrySet())
      {
         Fqn childFqn = n.getKey();


         if (childFqn.isDirectChildOf(fqn))
         {
            ReadCommittedNode childNode = (ReadCommittedNode) n.getValue();
            if (childNode.isCreated()) childNames.add(childFqn.getLastElement());
         }
      }
      return childNames;
   }

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    * @param ctx invocation context
    * @return a Set<K> of data keys contained in a node for a given Fqn, or null if the Fqn refers to a node that does not exist.
    */
   public Object perform(InvocationContext ctx)
   {
      NodeSPI n = ctx.lookUpNode(fqn);
      if (n == null || n.isDeleted()) return null;
      return n.getKeysDirect();
   }

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    *
    * @return an Object of type V, stored under a specific key in a node for a given Fqn, or null if the Fqn refers to a node that does not exist.
    */
   public Object perform(InvocationContext ctx)
   {
      NodeSPI n = ctx.lookUpNode(fqn);
      if (n == null)
      {
         if (trace) log.trace("Node not found");
         return null;
      }
      if (n.isDeleted())
      {
         if (trace) log.trace("Node has been deleted and is of type " + n.getClass().getSimpleName());
         return null;
      }
      if (sendNodeEvent) notifier.notifyNodeVisited(fqn, true, ctx);
      Object result = n.getDirect(key);
      if (trace) log.trace("Found value " + result);
      if (sendNodeEvent) notifier.notifyNodeVisited(fqn, false, ctx);
      return result;
   }

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    *
    * @return true if the node exists, false otherwise.
    */
   public Object perform(InvocationContext ctx)
   {
      NodeSPI node = ctx.lookUpNode(fqn);
      return node != null && !node.isDeleted();
   }

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   }


   @Override
   public Object perform(InvocationContext ctx)
   {
      NodeSPI node = enforceNodeLoading();
      if (trace) log.trace("Invalidating fqn:" + fqn);
      if (node == null)
      {
         // check if a tombstone already exists
         NodeSPI nodeSPI = dataContainer.peek(fqn, true, true);
         if (nodeSPI == null)
         {
            if (dataVersion == null)
            {
               if (trace)

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   }


   private void dumpVersionInfo(CacheSPI c1, CacheSPI c2, Fqn fqn)
   {
      System.out.println("**** Versin Info for Fqn [" + fqn + "] ****");
      NodeSPI n1 = c1.getRoot().getChildDirect(fqn);
      System.out.println("  Cache 1: " + n1.getVersion() + " dataLoaded? " + n1.isDataLoaded());


      NodeSPI n2 = c2.getRoot().getChildDirect(fqn);
      System.out.println("  Cache 2: " + n2.getVersion() + " dataLoaded? " + n2.isDataLoaded());
   }

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   public void testRecordingLocksNoTx() throws InterruptedException
   {
      AbstractLockManagerRecordingTestTL tl = threadLocal.get();
      LockManager lm = tl.lm;
      Fqn fqn = Fqn.fromString("/a/b/c");
      NodeSPI node = createNode(fqn);
      InvocationContext ctx = tl.icc.get();


      // lock and record.
      lm.lockAndRecord(node, WRITE, ctx);
      assert ctx.getLocks().contains(fqnBasedLocking ? fqn : node.getLock());
      assert ctx.getLocks().size() == 1;
      assert lm.isLocked(node) : "Should be locked";
      lm.unlock(ctx);
      assert !lm.isLocked(node) : "Should not be locked";
   }

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   public void testRecordingLocksWithTx() throws InterruptedException, SystemException, RollbackException
   {
      AbstractLockManagerRecordingTestTL tl = threadLocal.get();
      LockManager lm = tl.lm;
      Fqn fqn = Fqn.fromString("/a/b/c");
      NodeSPI node = createNode(fqn);
      InvocationContext ctx = tl.icc.get();
      ctx.setGlobalTransaction(new GlobalTransaction());
      ctx.setTransaction(new DummyTransaction(DummyTransactionManager.getInstance()));
      ctx.setTransactionContext(tl.contextFactory.createTransactionContext(ctx.getTransaction()));


      // lock and record.
      lm.lockAndRecord(node, WRITE, ctx);
      assert ctx.getLocks().contains(fqnBasedLocking ? fqn : node.getLock());
      assert ctx.getTransactionContext().getLocks().size() == 1;
      assert lm.isLocked(node) : "Should be locked";
      lm.unlock(ctx);
      assert !lm.isLocked(node) : "Should not be locked";
   }

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            for (Address a : toRemove)
            {
               BuddyGroup bg = buddyGroupsIParticipateIn.remove(a);
               Fqn backupRootFqn = buddyFqnTransformer.getBackupRoot(bg.getDataOwner());
               NodeSPI backupRoot = cache.getNode(backupRootFqn);
               if (backupRoot != null)
               {
                  // could be a race condition where the backup region has been removed because we have been removed
                  // from the buddy group, but the buddyGroupsIParticipateIn map hasn't been updated.
                  migrateDefunctData(backupRoot, bg.getDataOwner());

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