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

      assertTrue("Data should be loaded for node " + f, cache.peek(f, false).isDataLoaded());
   }


   protected void assertDataNotLoaded(Fqn f)
   {
      NodeSPI n = cache.peek(f, true);
      assertFalse("Data should not be loaded for node " + f, n != null && n.isDataLoaded());
   }

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      NodeSpiMock secondDeadNode = (NodeSpiMock) root.addChildDirect(fqnTransformer.getDeadBackupRoot(secondAddress));
      secondDeadNode.addChildDirect(Fqn.fromElements(0));




      expect(spiMock.getNode(fqn)).andReturn(null);
      NodeSPI buddyBackupRoot = (NodeSPI) root.getChild(BuddyManager.BUDDY_BACKUP_SUBTREE_FQN);
      expect(containerMock.peek(BuddyManager.BUDDY_BACKUP_SUBTREE_FQN)).andReturn(buddyBackupRoot);


      control.checkOrder(false);
      expect(spiMock.getChildrenNames(firstDeadNode.getFqn())).andReturn(firstDeadNode.getChildrenNames());
      Object fqnElement = fqn.getLastElement();//this is only composed from one element

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   }


   public void testLockReentrancy() throws InterruptedException
   {
      Fqn fqn = Fqn.fromString("/a/b/c");
      NodeSPI node = new NodeInvocationDelegate(new UnversionedNode(fqn));


      assert lm.lock(fqn, WRITE, null);
      assert lm.isLocked(node);


      assert lm.lock(node, WRITE, null);

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   }




   public void testAcquireAll() throws Exception
   {
      NodeSPI root;
      Object owner = Thread.currentThread();


      cache = createCache(Configuration.CacheMode.LOCAL, IsolationLevel.SERIALIZABLE);
      cache.put("/a/b/c", null);
      cache.put("/1/2/3", null);


      root = cache.getRoot();
      NodeLock lock = root.getLock();


      lock.acquireAll(owner, 2000, LockType.READ);
      lock.releaseAll(owner);


      assertEquals(0, cache.getNumberOfLocksHeld());

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   }




   public void testAcquireAllReplicated() throws Exception
   {
      NodeSPI root;
      Object owner = Thread.currentThread();


      cache2 = createCache(Configuration.CacheMode.REPL_ASYNC, IsolationLevel.SERIALIZABLE);
      cache2.put("/a/b/c", null);
      cache2.put("/1/2/3", null);


      cache = createCache(Configuration.CacheMode.REPL_ASYNC, IsolationLevel.SERIALIZABLE);
      root = cache.getRoot();
      NodeLock lock = root.getLock();


      lock.acquireAll(owner, 2000, LockType.READ);
      lock.releaseAll(owner);


      assertEquals(0, cache.getNumberOfLocksHeld());

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   {
      if (cache.getCacheStatus() == CacheStatus.STARTING)
      {
         // Before calling the nested cache loader we first check if the data exists in the local cache
         // in order to prevent multiple call to the cache store                  
         NodeSPI node = cache.peek(name, false);
         if (node != null)
         {
            // The node already exists in the local cache, so we return the corresponding data
            return node.getDataDirect();
         }
         else
         {
            // The node doesn't exist in the local cache, so we need to check through the nested
            // cache loader

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   {
      if (cache.getCacheStatus() == CacheStatus.STARTING)
      {
         // Before calling the nested cache loader we first check if the data exists in the local cache
         // in order to prevent multiple call to the cache store                  
         NodeSPI node = cache.peek(name, false);
         if (node != null)
         {
            // The node already exists in the local cache, so we return the corresponding data
            return node.getDataDirect();
         }
         else
         {
            // The node doesn't exist in the local cache, so we need to check through the nested
            // cache loader

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            // ${ws-id}/$CHILD_NODES_BY_PATTERN_LIST/${node-id}/${pattern-QPathEntry} or
            // ${ws-id}/$CHILD_PROPS_BY_PATTERN_LIST/${node-id}/${pattern-QPathEntry}


            // We use the method hasChildrenDirect to avoid going through 
            // the intercepter chain (EXOJCR-460)
            NodeSPI node = ((CacheSPI)cache).peek(parentFqn, false);
            // Check if not null, possibly this node was concurrently removed 
            if (node != null && !node.hasChildrenDirect())
            {
               if (LOG.isTraceEnabled())
               {
                  LOG.trace("Evicting Fqn " + parentFqn);
               }

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   {
      if (cache.getCacheStatus() == CacheStatus.STARTING)
      {
         // Before calling the nested cache loader we first check if the data exists in the local cache
         // in order to prevent multiple call to the cache store                  
         NodeSPI node = cache.peek(name, false);
         if (node != null)
         {
            // The node already exists in the local cache, so we return the corresponding data
            return node.getDataDirect();
         }
         else
         {
            // The node doesn't exist in the local cache, so we need to check through the nested
            // cache loader

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      return invokeNextInterceptor(ctx, command);
   }


   private void replace(InvocationContext ctx, Fqn fqn) throws InterruptedException
   {
      NodeSPI n = helper.wrapNodeForReading(ctx, fqn, true);
      if (n instanceof NullMarkerNode)
      {
         ctx.getLookedUpNodes().remove(fqn);
      }
      n = helper.wrapNodeForWriting(ctx, fqn, true, true, true, false, false);
      n.setDataLoaded(true);
   }

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