Examples of org.apache.zookeeper.server.DataTree

org.apache.zookeeper.server.DataTree
This class maintains the tree data structure. It doesn't have any networking or client connection code in it so that it can be tested in a stand alone way.
The tree maintains two parallel data structures: a hashtable that maps from full paths to DataNodes and a tree of DataNodes. All accesses to a path is through the hashtable. The tree is traversed only when serializing to disk.

        return dataTree;
    }
    
    public DataTree getNewDataTree() throws IOException {
        loadThisSnapShot();
        DataTree dt = convertThisSnapShot();
        return dt;
    }

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        // read old database and create 
        // an old snapshot
        UpgradeSnapShotV1 upgrade = new UpgradeSnapShotV1(bkupdataDir, 
                bkupsnapShotDir);
        LOG.info("Creating new data tree");
        DataTree dt = upgrade.getNewDataTree();
        FileTxnSnapLog filesnapLog = new FileTxnSnapLog(dataDir, 
                snapShotDir);
        LOG.info("snapshotting the new datatree");
        filesnapLog.save(dt, upgrade.getSessionWithTimeOuts());
        //done saving.

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        }
    }   
    
    private DataTree convertThisSnapShot() throws IOException {
        // create a datatree 
        DataTree dataTree = new DataTree();
        DataNodeV1 oldDataNode = oldDataTree.getNode("");
        if (oldDataNode == null) {
            //should never happen
            LOG.error("Upgrading from an empty snapshot.");
        }

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        return dataTree;
    }
    
    public DataTree getNewDataTree() throws IOException {
        loadThisSnapShot();
        DataTree dt = convertThisSnapShot();
        return dt;
    }

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    private DataTree dt;


    @Before
    public void setUp() throws Exception {
        dt=new DataTree();
    }

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    @Test
    public void testTxnFailure() throws Exception {
        long count = 1;
        File tmpDir = ClientBase.createTmpDir();
        FileTxnSnapLog logFile = new FileTxnSnapLog(tmpDir, tmpDir);
        DataTree dt = new DataTree();
        dt.createNode("/test", new byte[0], null, 0, -1, 1, 1);
        for (count = 1; count <= 3; count++) {
            dt.createNode("/test/" + count, new byte[0], null, 0, -1, count,
                    System.currentTimeMillis());
        }
        DataNode zk = dt.getNode("/test");


        // Make create to fail, then verify cversion.
        LOG.info("Attempting to create " + "/test/" + (count - 1));
        doOp(logFile, OpCode.create, "/test/" + (count - 1), dt, zk, -1);

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    @Test
    public void testTxnFailure() throws Exception {
        long count = 1;
        File tmpDir = ClientBase.createTmpDir();
        FileTxnSnapLog logFile = new FileTxnSnapLog(tmpDir, tmpDir);
        DataTree dt = new DataTree();
        dt.createNode("/test", new byte[0], null, 0, -1, 1, 1);
        for (count = 1; count <= 3; count++) {
            dt.createNode("/test/" + count, new byte[0], null, 0, -1, count,
                    System.currentTimeMillis());
        }
        DataNode zk = dt.getNode("/test");


        // Make create to fail, then verify cversion.
        LOG.info("Attempting to create " + "/test/" + (count - 1));
        doOp(logFile, OpCode.create, "/test/" + (count - 1), dt, zk, -1);

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    private DataTree dt;


    @Before
    public void setUp() throws Exception {
        dt=new DataTree();
    }

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    @Test(timeout = 60000)
    public void testDumpEphemerals() throws Exception {
        int count = 1000;
        long session = 1000;
        long zxid = 2000;
        final DataTree dataTree = new DataTree();
        LOG.info("Create {} zkclient sessions and its ephemeral nodes", count);
        createEphemeralNode(session, dataTree, count);
        final AtomicBoolean exceptionDuringDumpEphemerals = new AtomicBoolean(
                false);
        final AtomicBoolean running = new AtomicBoolean(true);
        Thread thread = new Thread() {
            public void run() {
                PrintWriter pwriter = new PrintWriter(new StringWriter());
                try {
                    while (running.get()) {
                        dataTree.dumpEphemerals(pwriter);
                    }
                } catch (Exception e) {
                    LOG.error("Received exception while dumpEphemerals!", e);
                    exceptionDuringDumpEphemerals.set(true);
                }

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    @Test(timeout = 60000)
    public void testPathTrieClearOnDeserialize() throws Exception {


        //Create a DataTree with quota nodes so PathTrie get updated
        DataTree dserTree = new DataTree();
        
        dserTree.createNode("/bug", new byte[20], null, -1, 1, 1, 1);
        dserTree.createNode(Quotas.quotaZookeeper+"/bug", null, null, -1, 1, 1, 1);
        dserTree.createNode(Quotas.quotaPath("/bug"), new byte[20], null, -1, 1, 1, 1);
        dserTree.createNode(Quotas.statPath("/bug"), new byte[20], null, -1, 1, 1, 1);
        
        //deserialize a DataTree; this should clear the old /bug nodes and pathTrie
        DataTree tree = new DataTree();


        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        BinaryOutputArchive oa = BinaryOutputArchive.getArchive(baos);
        tree.serialize(oa, "test");
        baos.flush();


        ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
        BinaryInputArchive ia = BinaryInputArchive.getArchive(bais);
        dserTree.deserialize(ia, "test");

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