Examples of org.jboss.cache.Node

org.jboss.cache.Node
A Node is a {@link Fqn named} logical grouping of data in the JBoss {@link Cache}. A node should be used to contain data for a single data record, for example information about a particular person or account.
One purpose of grouping cache data into separate nodes is to minimize transaction locking interference, and increase concurrency. So for example, when multiple threads or possibly distributed caches are acccessing different accounts simultaneously.
Another is that when making changes to this node, its data might be kept in a single database row or file on disk. (Persisted via the use of a {@link org.jboss.cache.loader.CacheLoader}.)
A node has references to its children, parent (each node except the root - defined by {@link Fqn#ROOT} - hasa single parent) and data contained within the node (as key/value pairs). The data access methods are similar to the collections {@link Map} interface,but some are read-only or return copies of the underlying the data.
@author Manik Surtani (manik AT jboss DOT org) @see Cache @since 2.0.0

   }


   public void testLazyLoadingOnNodeGetChildren() throws Exception
   {
      cache.getTransactionManager().begin();
      Node node = cache.getRoot().getChild(parent);
      assert node.getChildren().size() == 1 : "Node should have 1 child";
      WorkspaceNode n = getWorkspaceNode(parent);
      assert n.isChildrenLoaded() : "Should have loaded children";
      cache.getTransactionManager().commit();
   }

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   public void testLazyLoadingOnNodeAddChild() throws Exception
   {
      Fqn newChild = Fqn.fromString("/newchild");
      cache.getTransactionManager().begin();
      Node node = cache.getRoot().getChild(parent);
      node.addChild(newChild);
      assert node.hasChild(newChild) : "Node should have added child";
      WorkspaceNode n = getWorkspaceNode(parent);
      assert !n.isChildrenLoaded() : "Should not have loaded children";
      cache.getTransactionManager().commit();
   }

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   }


   public void testLazyLoadingOnNodeRemoveChild() throws Exception
   {
      cache.getTransactionManager().begin();
      Node node = cache.getRoot().getChild(parent);
      node.removeChild(child.getLastElement());
      assert !node.hasChild(child.getLastElement()) : "Node should have removed child";
      WorkspaceNode n = getWorkspaceNode(parent);
      assert !n.isChildrenLoaded() : "Should not have loaded children";
      cache.getTransactionManager().commit();
   }

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      assertDataLoaded(child);
      cache.get(child, "foo2"); // does not exist, will trigger a load
      assertDataLoaded(child);


      // should not load
      Node node = cache.getRoot().getChild(parent);
      assertDataLoaded(child);
      assertDataNotLoaded(parent);


      // needs to load children at this stage in case there are other children that have been evicted.
      Set children = node.getChildren(); //getchildrennames /parent
      assertEquals(1, children.size());
      assertDataLoaded(child);
      cache.get(child, "foo"); //get /parent/child
      assertDataLoaded(child);

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      // evict the parent
      cache.evict(parent, false);
      assertNull(cache.peek(parent, false));


      // now get node.
      Node n = cache.getRoot().getChild(parent);
      assertNotNull(n);
      assertDataNotLoaded(parent);


      verify(mockCacheLoader);
   }

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      // evict the parent
      cache.evict(parent, false);
      assertNull(cache.peek(parent, false));


      // now get node.
      Node n = cache.getRoot().getChild(parent);
      assertNotNull(n);
      assertDataNotLoaded(parent);


      // should not load node but should change isDataLoaded to true
      // will trigger a removedata() though
      n.clearData();


      assertDataLoaded(parent);
      verify(mockCacheLoader);
   }

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      retrieverThread.setDaemon(true);
      retrieverThread.start();
      assert waitForEviction(cache, 30, TimeUnit.SECONDS, Fqn.fromString(rootStr + 3));
      String val = (String) cache.get(rootStr + "3", rootStr + "3");
      assertNull("Node should be empty ", val);
      Node n = cache.getNode(fqn7);
      assert n != null;
      val = (String) n.get(rootStr + "7");
      assertNotNull("Node should not be empty ", val);
      retrieverThread.interrupt();
      retrieverThread.join();
      new EvictionController(cache).startEviction(true);
      assert waitForEviction(cache, 30, TimeUnit.SECONDS, Fqn.fromString(rootStr + 7));

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      assertNull("Node should be empty ", val);
   }


   public void testOvereviction() throws Exception
   {
      Node node = cache.getRoot().addChild(Fqn.fromString("/base/"));
      node.setResident(true);
      cache.getRoot().setResident(true);


      EvictionWatcher ew = new EvictionWatcher(cache, Fqn.fromString("/base/1"));


      for (int i = 1; i < baseRegionMaxNodes + 2; i++)

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   }




   public Entry get(String uri, MediaType accept)
   {
      Node parent = cache.getRoot().getChild(Fqn.fromElements(uri));
      if (parent == null) return null;


      for (Object obj : parent.getChildren())
      {
         Node leaf = (Node) obj;
         CacheEntry entry = (CacheEntry) leaf.get("entry");
         if (entry == null) continue;
         if (accept.isCompatible(entry.getMediaType()))
         {
            return entry;
         }

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   public Entry add(String uri, MediaType mediaType, CacheControl cc, MultivaluedMap<String, Object> headers, byte[] entity, String etag)
   {
      // there's a race condition here with a concurrent get() method above.  Too bad JBoss Cache doesn't have a way to create
      // a node before hand then insert it
      CacheEntry cacheEntry = new CacheEntry(headers, entity, cc.getMaxAge(), etag, mediaType);
      Node parent = cache.getRoot().addChild(Fqn.fromElements(uri));
      Node leaf = parent.addChild(Fqn.fromElements(mediaType.toString()));
      leaf.put("entry", cacheEntry);
      leaf.put(ExpirationAlgorithmConfig.EXPIRATION_KEY, (cc.getMaxAge() * 1000) + System.currentTimeMillis());
      return cacheEntry;
   }

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