Examples of org.apache.zookeeper_voltpatches.ZooKeeper

Package org.apache.zookeeper_voltpatches

Examples of org.apache.zookeeper_voltpatches.ZooKeeper

org.apache.zookeeper_voltpatches.ZooKeeper
This is the main class of ZooKeeper client library. To use a ZooKeeper service, an application must first instantiate an object of ZooKeeper class. All the iterations will be done by calling the methods of ZooKeeper class. The methods of this class are thread-safe unless otherwise noted.
Once a connection to a server is established, a session ID is assigned to the client. The client will send heart beats to the server periodically to keep the session valid.
The application can call ZooKeeper APIs through a client as long as the session ID of the client remains valid.
If for some reason, the client fails to send heart beats to the server for a prolonged period of time (exceeding the sessionTimeout value, for instance), the server will expire the session, and the session ID will become invalid. The client object will no longer be usable. To make ZooKeeper API calls, the application must create a new client object.
If the ZooKeeper server the client currently connects to fails or otherwise does not respond, the client will automatically try to connect to another server before its session ID expires. If successful, the application can continue to use the client.
Some successful ZooKeeper API calls can leave watches on the "data nodes" in the ZooKeeper server. Other successful ZooKeeper API calls can trigger those watches. Once a watch is triggered, an event will be delivered to the client which left the watch at the first place. Each watch can be triggered only once. Thus, up to one event will be delivered to a client for every watch it leaves.
A client needs an object of a class implementing Watcher interface for processing the events delivered to the client. When a client drops current connection and re-connects to a server, all the existing watches are considered as being triggered but the undelivered events are lost. To emulate this, the client will generate a special event to tell the event handler a connection has been dropped. This special event has type EventNone and state sKeeperStateDisconnected.

    }


    @Test
    public void testSPMasterChange() throws Exception
    {
        ZooKeeper zk = getClient(0);
        VoltZK.createPersistentZKNodes(zk);
        LeaderCache spwriter = new LeaderCache(zk, VoltZK.iv2masters);
        HostMessenger hm = mock(HostMessenger.class);
        when(hm.getZK()).thenReturn(m_messengers.get(0).getZK());
        Cartographer dut = new Cartographer(hm, 0, false);

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    }


    @Test
    public void testMPIChange() throws Exception
    {
        ZooKeeper zk = getClient(0);
        VoltZK.createPersistentZKNodes(zk);
        LeaderCache mpwriter = new LeaderCache(zk, VoltZK.iv2mpi);
        HostMessenger hm = mock(HostMessenger.class);
        when(hm.getZK()).thenReturn(m_messengers.get(0).getZK());
        Cartographer dut = new Cartographer(hm, 0, false);

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        }
    }


    public void validateStartAction() {
        try {
            ZooKeeper zk = m_hostMessenger.getZK();
            boolean initCompleted = zk.exists(VoltZK.init_completed, false) != null;
            List<String> children = zk.getChildren(VoltZK.start_action, new StartActionWatcher(), null);
            if (!children.isEmpty()) {
                for (String child : children) {
                    byte[] data = zk.getData(VoltZK.start_action + "/" + child, false, null);
                    if (data == null) {
                        VoltDB.crashLocalVoltDB("Couldn't find " + VoltZK.start_action + "/" + child);
                    }
                    String startAction = new String(data);
                    if ((startAction.equals(StartAction.JOIN.toString()) ||

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                js.object();
                js.key("role").value(m_config.m_replicationRole.ordinal());
                js.key("active").value(m_rvdb.getReplicationActive());
                js.endObject();


                ZooKeeper zk = m_rvdb.getHostMessenger().getZK();
                // rejoining nodes figure out the replication role from other nodes
                if (!m_isRejoin)
                {
                    try {
                        zk.create(
                                VoltZK.replicationconfig,
                                js.toString().getBytes("UTF-8"),
                                Ids.OPEN_ACL_UNSAFE,
                                CreateMode.PERSISTENT);
                    } catch (KeeperException.NodeExistsException e) {}
                    String discoveredReplicationConfig =
                        new String(zk.getData(VoltZK.replicationconfig, false, null), "UTF-8");
                    JSONObject discoveredjsObj = new JSONObject(discoveredReplicationConfig);
                    ReplicationRole discoveredRole = ReplicationRole.get((byte) discoveredjsObj.getLong("role"));
                    if (!discoveredRole.equals(m_config.m_replicationRole)) {
                        VoltDB.crashGlobalVoltDB("Discovered replication role " + discoveredRole +
                                " doesn't match locally specified replication role " + m_config.m_replicationRole,
                                true, null);
                    }


                    // See if we should bring the server up in WAN replication mode
                    m_rvdb.setReplicationRole(discoveredRole);
                } else {
                    String discoveredReplicationConfig =
                            new String(zk.getData(VoltZK.replicationconfig, false, null), "UTF-8");
                    JSONObject discoveredjsObj = new JSONObject(discoveredReplicationConfig);
                    ReplicationRole discoveredRole = ReplicationRole.get((byte) discoveredjsObj.getLong("role"));
                    boolean replicationActive = discoveredjsObj.getBoolean("active");
                    // See if we should bring the server up in WAN replication mode
                    m_rvdb.setReplicationRole(discoveredRole);

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    }


    @Test
    public void testInitialCache() throws Exception
    {
        ZooKeeper zk = getClient(0);
        configure("/cache01", zk);


        LeaderCache dut = new  LeaderCache(zk, "/cache01");
        dut.start(true);
        Map<Integer, Long> cache = dut.pointInTimeCache();


        assertEquals("3 items cached.", 3, cache.size());
        assertEquals(12345678L, dut.get(0).longValue());
        assertEquals(87654321L, dut.get(1).longValue());
        assertEquals(11223344L, dut.get(2).longValue());


        dut.shutdown();
        zk.close();
    }

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    }


    @Test
    public void testInitialCacheWithCallback() throws Exception
    {
        ZooKeeper zk = getClient(0);
        configure("/cache01", zk);


        TestCallback cb = new TestCallback();
        LeaderCache dut = new  LeaderCache(zk, "/cache01", cb);
        dut.start(true);


        assertEquals("3 items cached.", 3, cb.m_cache.size());
        assertEquals(12345678, cb.m_cache.get(0).longValue());
        assertEquals(87654321, cb.m_cache.get(1).longValue());
        assertEquals(11223344, cb.m_cache.get(2).longValue());


        dut.shutdown();
        zk.close();
    }

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    }


    @Test
    public void testModifyChild() throws Exception
    {
        ZooKeeper zk = getClient(0);
        configure("/cache03", zk);


        LeaderCache dut = new  LeaderCache(zk, "/cache03");
        dut.start(true);
        Map<Integer, Long> cache = dut.pointInTimeCache();


        assertEquals("3 items cached.", 3, cache.size());
        assertEquals(12345678, dut.get(0).longValue());


        zk.setData("/cache03/0", Long.toString(23456789).getBytes(), -1);
        while(true) {
            if (dut.get(0) == 23456789) {
                break;
            }
        }
        assertEquals("3 items cached.", 3, cache.size());
        assertEquals(23456789L, dut.get(0).longValue());
        assertEquals(87654321L, dut.get(1).longValue());
        assertEquals(11223344L, dut.get(2).longValue());


        dut.shutdown();
        zk.close();
    }

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    }


    @Test
    public void testModifyChildWithCallback() throws Exception
    {
        ZooKeeper zk = getClient(0);
        configure("/cache03", zk);


        TestCallback cb = new TestCallback();
        LeaderCache dut = new  LeaderCache(zk, "/cache03", cb);
        dut.start(true);
        Map<Integer, Long> cache = cb.m_cache;


        assertEquals("3 items cached.", 3, cache.size());
        assertEquals(12345678, cache.get(0).longValue());


        dut.put(0, 23456789);
        while(true) {
            cache = cb.m_cache;
            if (cache.get(0) == 23456789) {
                break;
            }
        }
        cache = cb.m_cache;
        assertEquals("3 items cached.", 3, cache.size());
        assertEquals(23456789, cache.get(0).longValue());
        assertEquals(87654321, cache.get(1).longValue());
        assertEquals(11223344, cache.get(2).longValue());


        dut.shutdown();
        zk.close();
    }

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    }


    @Test
    public void testDeleteChild() throws Exception
    {
        ZooKeeper zk = getClient(0);
        configure("/cache02", zk);


        LeaderCache dut = new LeaderCache(zk, "/cache02");
        dut.start(true);
        Map<Integer, Long> cache = dut.pointInTimeCache();
        assertEquals("3 items cached.", 3, cache.size());


        zk.delete("/cache02/1", -1);
        while(true) {
            cache = dut.pointInTimeCache();
            if (cache.size() == 3) {
                Thread.sleep(1);
            }
            else {
                break;
            }
        }
        assertEquals("Item removed", 2, cache.size());
        assertEquals(null, cache.get(1));
        assertEquals(12345678, cache.get(0).longValue());
        assertEquals(11223344, cache.get(2).longValue());


        dut.shutdown();
        zk.close();
    }

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    }


    @Test
    public void testDeleteChildWithCallback() throws Exception
    {
        ZooKeeper zk = getClient(0);
        configure("/cache02", zk);


        TestCallback cb = new TestCallback();
        LeaderCache dut = new LeaderCache(zk, "/cache02", cb);
        dut.start(true);
        Map<Integer, Long> cache = cb.m_cache;
        assertEquals("3 items cached.", 3, cache.size());


        zk.delete("/cache02/1", -1);
        while(true) {
            cache = cb.m_cache;
            if (cache.size() == 3) {
                Thread.sleep(1);
            }
            else {
                break;
            }
        }
        assertEquals("Item removed", 2, cache.size());
        assertEquals(null, cache.get(1));
        assertEquals(12345678, cache.get(0).longValue());
        assertEquals(11223344, cache.get(2).longValue());


        dut.shutdown();
        zk.close();
    }

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Related Classes of org.apache.zookeeper_voltpatches.ZooKeeper

org.apache.zookeeper_voltpatches.proto.CreateRequest

org.apache.zookeeper_voltpatches.proto.CreateResponse

org.apache.zookeeper_voltpatches.proto.DeleteRequest

org.apache.zookeeper_voltpatches.proto.ExistsRequest

org.apache.zookeeper_voltpatches.proto.GetACLRequest

org.apache.zookeeper_voltpatches.proto.GetACLResponse

org.apache.zookeeper_voltpatches.proto.GetChildren2Request

org.apache.zookeeper_voltpatches.proto.GetChildren2Response

org.apache.zookeeper_voltpatches.proto.GetChildrenRequest

org.apache.zookeeper_voltpatches.proto.GetChildrenResponse

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