Examples of com.sleepycat.je.rep.StateChangeListener

com.sleepycat.je.rep.StateChangeListener
An asynchronous mechanism for tracking the {@link ReplicatedEnvironment.State State} of the replicated environment andchoosing how to route database operations. {@code State} determines whichoperations are currently permitted on the node. For example, only the {@link ReplicatedEnvironment.State#MASTER MASTER} node can execute writeoperations.
The Listener is registered with the replicated environment using {@link ReplicatedEnvironment#setStateChangeListener(StateChangeListener)}. There is at most one Listener associated with the actual environment (not an {@link com.sleepycat.je.Environment} handle) at any given instance in time.
{@literal See} the {@link examples} for information on different approaches toward routingdatabase operations and an example of using the StateChangeListener. @see Managing Write Requests at a Replica

        }
        return useNode.isMaster();
    }


    public void setChangeListener(StateChangeListener listener) {
        StateChangeListener prevListener = nodeState.getChangeListener();
        nodeState.setChangeListener(listener);


        /*
         * Call back so that it's aware of the last state change event and
         * the application can initialize itself correctly as a master or

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                    LOGGER.info("The environment facade is in open state for node " + _prettyGroupNodeName);
                    _joinTime = System.currentTimeMillis();
                }
            }


            StateChangeListener listener = _stateChangeListener.get();
            if (listener != null && (_state.get() == State.OPEN || _state.get() == State.RESTARTING))
            {
                listener.stateChange(stateChangeEvent);
            }


            if (_lastKnownEnvironmentState == ReplicatedEnvironment.State.MASTER && state == ReplicatedEnvironment.State.DETACHED && _state.get() == State.OPEN)
            {
                tryToRestartEnvironment(null);

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    {
        final CountDownLatch masterLatch = new CountDownLatch(1);
        final AtomicInteger masterStateChangeCount = new AtomicInteger();
        final CountDownLatch unknownLatch = new CountDownLatch(1);
        final AtomicInteger unknownStateChangeCount = new AtomicInteger();
        StateChangeListener stateChangeListener = new StateChangeListener()
        {
            @Override
            public void stateChange(StateChangeEvent stateChangeEvent) throws RuntimeException
            {
                if (stateChangeEvent.getState() == State.MASTER)

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    public void testTransferMasterToSelf() throws Exception
    {
        final CountDownLatch firstNodeReplicaStateLatch = new CountDownLatch(1);
        final CountDownLatch firstNodeMasterStateLatch = new CountDownLatch(1);
        StateChangeListener stateChangeListener = new StateChangeListener(){


            @Override
            public void stateChange(StateChangeEvent event) throws RuntimeException
            {
                ReplicatedEnvironment.State state = event.getState();
                if (state == ReplicatedEnvironment.State.REPLICA)
                {
                    firstNodeReplicaStateLatch.countDown();
                }
                if (state == ReplicatedEnvironment.State.MASTER)
                {
                    firstNodeMasterStateLatch.countDown();
                }
            }
        };
        ReplicatedEnvironmentFacade firstNode = addNode(stateChangeListener, new NoopReplicationGroupListener());
        assertTrue("Environment did not become a master", firstNodeMasterStateLatch.await(10, TimeUnit.SECONDS));


        int replica1Port = getNextAvailable(TEST_NODE_PORT + 1);
        String node1NodeHostPort = "localhost:" + replica1Port;
        ReplicatedEnvironmentFacade secondNode = createReplica(TEST_NODE_NAME + "_1", node1NodeHostPort, new NoopReplicationGroupListener());
        assertEquals("Unexpected state", ReplicatedEnvironment.State.REPLICA.name(), secondNode.getNodeState());


        int replica2Port = getNextAvailable(replica1Port + 1);
        String node2NodeHostPort = "localhost:" + replica2Port;
        final CountDownLatch replicaStateLatch = new CountDownLatch(1);
        final CountDownLatch masterStateLatch = new CountDownLatch(1);
        StateChangeListener testStateChangeListener = new StateChangeListener()
        {
            @Override
            public void stateChange(StateChangeEvent event) throws RuntimeException
            {
                ReplicatedEnvironment.State state = event.getState();

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    public void testTransferMasterAnotherNode() throws Exception
    {
        final CountDownLatch firstNodeReplicaStateLatch = new CountDownLatch(1);
        final CountDownLatch firstNodeMasterStateLatch = new CountDownLatch(1);
        StateChangeListener stateChangeListener = new StateChangeListener(){


            @Override
            public void stateChange(StateChangeEvent event) throws RuntimeException
            {
                ReplicatedEnvironment.State state = event.getState();
                if (state == ReplicatedEnvironment.State.REPLICA)
                {
                    firstNodeReplicaStateLatch.countDown();
                }
                if (state == ReplicatedEnvironment.State.MASTER)
                {
                    firstNodeMasterStateLatch.countDown();
                }
            }
        };
        ReplicatedEnvironmentFacade firstNode = addNode(stateChangeListener, new NoopReplicationGroupListener());
        assertTrue("Environment did not become a master", firstNodeMasterStateLatch.await(10, TimeUnit.SECONDS));


        int replica1Port = getNextAvailable(TEST_NODE_PORT + 1);
        String node1NodeHostPort = "localhost:" + replica1Port;
        ReplicatedEnvironmentFacade secondNode = createReplica(TEST_NODE_NAME + "_1", node1NodeHostPort, new NoopReplicationGroupListener());
        assertEquals("Unexpected state", ReplicatedEnvironment.State.REPLICA.name(), secondNode.getNodeState());


        int replica2Port = getNextAvailable(replica1Port + 1);
        String node2NodeHostPort = "localhost:" + replica2Port;
        final CountDownLatch replicaStateLatch = new CountDownLatch(1);
        final CountDownLatch masterStateLatch = new CountDownLatch(1);
        StateChangeListener testStateChangeListener = new StateChangeListener()
        {
            @Override
            public void stateChange(StateChangeEvent event) throws RuntimeException
            {
                ReplicatedEnvironment.State state = event.getState();

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        }
        return useNode.isMaster();
    }


    public void setChangeListener(StateChangeListener listener) {
        StateChangeListener prevListener = nodeState.getChangeListener();
        nodeState.setChangeListener(listener);


        /*
         * Call back so that it's aware of the last state change event and
         * the application can initialize itself correctly as a master or

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    {
        final CountDownLatch masterLatch = new CountDownLatch(1);
        final AtomicInteger masterStateChangeCount = new AtomicInteger();
        final CountDownLatch unknownLatch = new CountDownLatch(1);
        final AtomicInteger unknownStateChangeCount = new AtomicInteger();
        StateChangeListener stateChangeListener = new StateChangeListener()
        {
            @Override
            public void stateChange(StateChangeEvent stateChangeEvent) throws RuntimeException
            {
                if (stateChangeEvent.getState() == State.MASTER)

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    public void testTransferMasterToSelf() throws Exception
    {
        final CountDownLatch firstNodeReplicaStateLatch = new CountDownLatch(1);
        final CountDownLatch firstNodeMasterStateLatch = new CountDownLatch(1);
        StateChangeListener stateChangeListener = new StateChangeListener(){


            @Override
            public void stateChange(StateChangeEvent event) throws RuntimeException
            {
                ReplicatedEnvironment.State state = event.getState();
                if (state == ReplicatedEnvironment.State.REPLICA)
                {
                    firstNodeReplicaStateLatch.countDown();
                }
                if (state == ReplicatedEnvironment.State.MASTER)
                {
                    firstNodeMasterStateLatch.countDown();
                }
            }
        };
        ReplicatedEnvironmentFacade firstNode = addNode(stateChangeListener, new NoopReplicationGroupListener());
        assertTrue("Environment did not become a master", firstNodeMasterStateLatch.await(10, TimeUnit.SECONDS));


        int replica1Port = _portHelper.getNextAvailable();
        String node1NodeHostPort = "localhost:" + replica1Port;
        ReplicatedEnvironmentFacade secondNode = createReplica(TEST_NODE_NAME + "_1", node1NodeHostPort, new NoopReplicationGroupListener());
        assertEquals("Unexpected state", ReplicatedEnvironment.State.REPLICA.name(), secondNode.getNodeState());


        int replica2Port = _portHelper.getNextAvailable();
        String node2NodeHostPort = "localhost:" + replica2Port;
        final CountDownLatch replicaStateLatch = new CountDownLatch(1);
        final CountDownLatch masterStateLatch = new CountDownLatch(1);
        StateChangeListener testStateChangeListener = new StateChangeListener()
        {
            @Override
            public void stateChange(StateChangeEvent event) throws RuntimeException
            {
                ReplicatedEnvironment.State state = event.getState();

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    public void testTransferMasterAnotherNode() throws Exception
    {
        final CountDownLatch firstNodeReplicaStateLatch = new CountDownLatch(1);
        final CountDownLatch firstNodeMasterStateLatch = new CountDownLatch(1);
        StateChangeListener stateChangeListener = new StateChangeListener(){


            @Override
            public void stateChange(StateChangeEvent event) throws RuntimeException
            {
                ReplicatedEnvironment.State state = event.getState();
                if (state == ReplicatedEnvironment.State.REPLICA)
                {
                    firstNodeReplicaStateLatch.countDown();
                }
                if (state == ReplicatedEnvironment.State.MASTER)
                {
                    firstNodeMasterStateLatch.countDown();
                }
            }
        };
        ReplicatedEnvironmentFacade firstNode = addNode(stateChangeListener, new NoopReplicationGroupListener());
        assertTrue("Environment did not become a master", firstNodeMasterStateLatch.await(10, TimeUnit.SECONDS));


        int replica1Port = _portHelper.getNextAvailable();
        String node1NodeHostPort = "localhost:" + replica1Port;
        ReplicatedEnvironmentFacade secondNode = createReplica(TEST_NODE_NAME + "_1", node1NodeHostPort, new NoopReplicationGroupListener());
        assertEquals("Unexpected state", ReplicatedEnvironment.State.REPLICA.name(), secondNode.getNodeState());


        int replica2Port = _portHelper.getNextAvailable();
        String node2NodeHostPort = "localhost:" + replica2Port;
        final CountDownLatch replicaStateLatch = new CountDownLatch(1);
        final CountDownLatch masterStateLatch = new CountDownLatch(1);
        StateChangeListener testStateChangeListener = new StateChangeListener()
        {
            @Override
            public void stateChange(StateChangeEvent event) throws RuntimeException
            {
                ReplicatedEnvironment.State state = event.getState();

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Related Classes of com.sleepycat.je.rep.StateChangeListener

com.sleepycat.je.rep.impl.RepImpl

org.apache.qpid.server.store.berkeleydb.replication.ReplicatedEnvironmentFacade

org.apache.qpid.server.store.berkeleydb.replication.ReplicatedEnvironmentFacadeTest

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