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

      final Fqn NODE = Fqn.fromString("/test");
      final String KEY = "key";
      cache.put(NODE, KEY, 10);
      cache.evict(NODE, false);
      addDelay();
      Node ret = cache.getNode(NODE);
      assertNotNull(ret);
   }

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      {
         cache.put("/a/1", null);
         cache.put("/a/2", null);
         cache.put("/a/3", null);


         Node n = cache.getNode("/a");
         assertNotNull(n);


         Set children = n.getChildrenNames();
         assertNotNull(children);
         assertEquals(3, children.size());
      }
      catch (Exception e)
      {

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      Map<Object, Object> map = new HashMap<Object, Object>();
      map.put("keyA", "valA");
      map.put("keyB", "valB");
      map.put("keyC", "valC");
      assertEquals(map, loader.get(key));
      Node n = cache.getRoot().getChild(key);
      n.clearData();
      assertEquals(Collections.emptyMap(), loader.get(key));
   }

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         public void run()
         {
            if (e.isPre() && selected_node != null && selected_node.getFqn().equals(e.getFqn()))//&& !isLocal)
            {
               clearTable();
               Node n = root.getChild(e.getFqn());
               if (n != null)
               {
                  populateTable(n.getData());
               }
            }
         }
      };
      executor.execute(r);

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         m.put("name", "Bela");
         m.put("id", 322649);
         cache.put("/bela/ban", m);
         tx.rollback();


         Node n = cache.getNode("/bela/ban");
         if (n.getData() == null)
            return;
         assertEquals("map should be empty", 0, n.getData().size());
      }
      catch (Throwable t)
      {
         t.printStackTrace();
         fail(t.toString());

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      System.out.println(cache);


      for (int i = 0; i < 10; i++)
      {
         String f = "/org/jboss/test/data/" + i;
         Node node = cache.getNode(f);
         System.out.println("Node for " + f + " is " + node);
         if (i % 2 == 0)
         {
            if (i < 6)
            {

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      for (int i = 0; i < 20; i++)
      {
         String str = rootStr + Integer.toString(i);
         Fqn fqn = Fqn.fromString(str);
         Node node = cache.getNode(fqn);
         System.out.println(i + " " + node);
         if (i > 9)
         {
            assertNull("Testing at " + i, node);
         }
         else
         {
            assertEquals(1 + i, node.getData().size());
         }
      }


      for (int i = 0; i < 17; i++)
      {
         cache.put("/org/jboss/data/3", 100 + i, "value");
      }


      Node node = cache.getNode("/org/jboss/data/3");
      assertEquals(21, node.getData().size());


      assert waitForEviction(cache, 30, TimeUnit.SECONDS, Fqn.fromString("/org/jboss/data/3")) : "Eviction event not received!";
      TestingUtil.sleepThread(200); // small grace period


      assertNull(cache.getNode("/org/jboss/data/3"));

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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 void testRemovalWithSpecifiedVersion() throws Exception
   {
      Fqn fqn = Fqn.fromString("/test/node");


      Node root = cache1.getRoot();
      cache1.getInvocationContext().getOptionOverrides().setDataVersion(new NonLockingDataVersion());
      root.addChild(fqn);
      cache1.getInvocationContext().getOptionOverrides().setDataVersion(new NonLockingDataVersion());
      cache1.removeNode(fqn);


      Assert.assertNull(cache1.getRoot().getChild(fqn));
   }

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