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

   /**
    * Creates a new memory node in preparation for storage.
    */
   private NodeSPI createTempNode(Fqn fqn, TransactionContext transactionContext) throws Exception
   {
      NodeSPI n = createNodes(fqn, transactionContext);
      n.setDataLoaded(false);
      if (trace)
      {
         log.trace("createTempNode n " + n);
      }
      return n;

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   private NodeSPI<?, ?> createNodes(Fqn fqn, TransactionContext transactionContext) throws Exception
   {
      Object[] results = dataContainer.createNodes(fqn);
      List<NodeSPI<?, ?>> createdNodes = (List<NodeSPI<?, ?>>) results[0];


      NodeSPI lastCreated = null;
      for (NodeSPI node : createdNodes)
      {
         node.setDataLoaded(false);
         if (transactionContext != null)
         {
            transactionContext.addDummyNodeCreatedByCacheLoader(node.getFqn());
         }
         lastCreated = node;
      }


      // mark the leaf node as data loaded since that is what we are doing in this interceptor.
      if (lastCreated != null) lastCreated.setDataLoaded(true);


      // regardless of whether the last node was created, return it.
      return (NodeSPI) results[1];
   }

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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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      assertTrue(cache.getRoot().hasChild(fqn));


      assertEquals(true, cache.removeNode(fqn));
      assertFalse(cache.getRoot().hasChild(fqn));
      // remove should REALLY remove though and not just mark as deleted/invalid.
      NodeSPI n = cache.peek(fqn, true, true);
      assert n == null;


      assertEquals(false, cache.removeNode(fqn));


      // remove should REALLY remove though and not just mark as deleted/invalid.

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    * @param key
    */
   protected boolean exists(String fqn, String key)
   {
      CacheSPI<Object, Object> cache = cacheTL.get();
      NodeSPI n = cache.peek(Fqn.fromString(fqn), false, false);
      if (key == null) return n != null;
      return n != null && n.getKeysDirect().contains(key);
   }

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      cache.evict(Fqn.fromString("/a/b/2"));
      // cache.evict(Fqn.fromString("/a/b/1"));
      cache.evict(Fqn.fromString("/a/b"));
      cache.evict(Fqn.fromString("/a"));


      NodeSPI n = cache.getNode("/a/b");
      assert !n.isChildrenLoaded();


      children = cache.getNode("/a/b").getChildrenNames();
      assertEquals(3, children.size());


      cache.evict(Fqn.fromString("/a/b/3"));

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      c = null;
   }


   public void testRoot()
   {
      NodeSPI node = c.getRoot();
      assert ((NodeInvocationDelegate) node).getDelegationTarget() instanceof VersionedNode;
   }

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   {
      Fqn A = Fqn.fromString("/a");
      Fqn B = Fqn.fromString("/b");
      Fqn A_B = Fqn.fromString("/a/b");


      NodeSPI nodeA, nodeB;


      cache.put(A, "k", "v");
      cache.put(A_B, "k", "v");


      nodeA = cache.getRoot().getChildDirect(A);// should work
      nodeB = cache.getRoot().getChildDirect(A_B);// should work


      assertEquals(A_B, nodeB.getFqn());


      nodeB = nodeA.getChildDirect(B);// should work
      assertEquals(A_B, nodeB.getFqn());
      assertEquals(true, cache.getRoot().removeChildDirect(A_B));// should work
      assertEquals(false, cache.getRoot().removeChildDirect(A_B));// should work


      cache.put(A_B, "k", "v");
      assertEquals(true, nodeA.removeChildDirect(B));// should work
      assertEquals(false, nodeA.removeChildDirect(B));// should work
      assertEquals(true, cache.getRoot().removeChildDirect(A.getLastElement()));
      assertEquals(false, cache.getRoot().removeChildDirect(A.getLastElement()));


      try
      {
         cache.getRoot().addChildDirect(A_B);// should fail
         fail("Should have failed");
      }
      catch (UnsupportedOperationException e)
      {
         // expected
      }
      nodeA = cache.getRoot().addChildDirect(A);// should work
      nodeA.addChildDirect(B);// should work
   }

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      tx.begin();
      GlobalTransaction gtx = cache.getCurrentTransaction();
      cache.put("/a/b/c", null);
      cache.put("/a/b/c", null);


      NodeSPI n = cache.getNode("/a");
      assert !lockManager.isLocked(n, READ);
      // make sure this is write locked.
      assertLocked(gtx, "/a", true);


      n = cache.getNode("/a/b");

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      cache.remove(f, "k1");


      assert loader.get(f).containsKey("_JBOSS_INTERNAL_OPTIMISTIC_DATA_VERSION");
      assert ((DefaultDataVersion) loader.get(f).get("_JBOSS_INTERNAL_OPTIMISTIC_DATA_VERSION")).getRawVersion() == 3;


      NodeSPI n = (NodeSPI) cache.getRoot().getChild(f);
      DataVersion dv = n.getVersion();


      assert dv instanceof DefaultDataVersion : "Should be an instance of DefaultDataVersion";


      assert ((DefaultDataVersion) dv).getRawVersion() == 3 : "Should have accurate data version";


      // now restart cache instance
      cache.stop();
      cache.start();


      assert cache.get(f, "k").equals("v") : "Value should have peristed";


      n = (NodeSPI) cache.getRoot().getChild(f);


      dv = n.getVersion();


      assert dv instanceof DefaultDataVersion : "Should be an instance of DefaultDataVersion";


      assert ((DefaultDataVersion) dv).getRawVersion() == 3 : "Version should have peristed";
      // make sure leakage doesn't occur into data map
      assert n.getData().size() == 1;
   }

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