SimpleCanalConnector

1. RocketMQCanalConnector

1.1 属性

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private String                              nameServer;
private String                              topic;
private String                              groupName;
private volatile boolean                    connected           = false;
private DefaultMQPushConsumer               rocketMQConsumer;
private BlockingQueue<ConsumerBatchMessage> messageBlockingQueue;
private int                                 batchSize           = -1;
private long                                batchProcessTimeout = 60 * 1000;
private boolean                             flatMessage;
private volatile ConsumerBatchMessage       lastGetBatchMessage = null;
private String                              accessKey;
private String                              secretKey;
private String                              customizedTraceTopic;
private boolean                             enableMessageTrace = false;
private String                              accessChannel;
private String                              namespace;

1.2 CannalConnector实现方法

1.2.1 connect

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public void connect() throws CanalClientException {
    RPCHook rpcHook = null;
    if (null != accessKey && accessKey.length() > 0 && null != secretKey && secretKey.length() > 0) {
        SessionCredentials sessionCredentials = new SessionCredentials();
        sessionCredentials.setAccessKey(accessKey);
        sessionCredentials.setSecretKey(secretKey);
        rpcHook = new AclClientRPCHook(sessionCredentials);
    }

    rocketMQConsumer = new DefaultMQPushConsumer(groupName, rpcHook, new AllocateMessageQueueAveragely(), enableMessageTrace, customizedTraceTopic);
    rocketMQConsumer.setVipChannelEnabled(false);
    if (CLOUD_ACCESS_CHANNEL.equals(this.accessChannel)) {
        rocketMQConsumer.setAccessChannel(AccessChannel.CLOUD);
    }

    if (!StringUtils.isEmpty(this.namespace)) {
        rocketMQConsumer.setNamespace(this.namespace);
    }

    if (!StringUtils.isBlank(nameServer)) {
        rocketMQConsumer.setNamesrvAddr(nameServer);
    }
    if (batchSize != -1) {
        rocketMQConsumer.setConsumeMessageBatchMaxSize(batchSize);
    }
}

1.2.2 disconnect

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public void disconnect() throws CanalClientException {
    rocketMQConsumer.shutdown();
    connected = false;
}

1.2.3 checkValid

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public boolean checkValid() throws CanalClientException {
    return connected;
}

1.2.4 subscribe

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public synchronized void subscribe(String filter) throws CanalClientException {
    if (connected) {
        return;
    }
    try {
        if (rocketMQConsumer == null) {
            this.connect();
        }
        rocketMQConsumer.subscribe(this.topic, "*");
        rocketMQConsumer.registerMessageListener(new MessageListenerOrderly() {

            @Override
            public ConsumeOrderlyStatus consumeMessage(List<MessageExt> messageExts, ConsumeOrderlyContext context) {
                context.setAutoCommit(true);
                boolean isSuccess = process(messageExts);
                if (isSuccess) {
                    return ConsumeOrderlyStatus.SUCCESS;
                } else {
                    return ConsumeOrderlyStatus.SUSPEND_CURRENT_QUEUE_A_MOMENT;
                }
            }
        });
        rocketMQConsumer.start();
        connected = true;
    } catch (MQClientException ex) {
        throw new RuntimeException("Start RocketMQ consumer error", ex);
    }
}

private boolean process(List<MessageExt> messageExts) {
    if (logger.isDebugEnabled()) {
        logger.debug("Get Message: {}", messageExts);
    }
    List messageList = new ArrayList<>();
    for (MessageExt messageExt : messageExts) {
        byte[] data = messageExt.getBody();
        if (data != null) {
            try {
                if (!flatMessage) {
                    Message message = CanalMessageDeserializer.deserializer(data);
                    messageList.add(message);
                } else {
                    FlatMessage flatMessage = JSON.parseObject(data, FlatMessage.class);
                    messageList.add(flatMessage);
                }
            } catch (Exception ex) {
                logger.error("Add message error", ex);
                throw new CanalClientException(ex);
            }
        } else {
            logger.warn("Received message data is null");
        }
    }
    ConsumerBatchMessage batchMessage;
    if (!flatMessage) {
        batchMessage = new ConsumerBatchMessage<Message>(messageList);
    } else {
        batchMessage = new ConsumerBatchMessage<FlatMessage>(messageList);
    }
    try {
        messageBlockingQueue.put(batchMessage);
    } catch (InterruptedException e) {
        logger.error("Put message to queue error", e);
        throw new RuntimeException(e);
    }
    boolean isCompleted;
    try {
        isCompleted = batchMessage.waitFinish(batchProcessTimeout);
    } catch (InterruptedException e) {
        logger.error("Interrupted when waiting messages to be finished.", e);
        throw new RuntimeException(e);
    }
    boolean isSuccess = batchMessage.isSuccess();
    return isCompleted && isSuccess;
}

1.2.5 unsubscribe

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public void unsubscribe() throws CanalClientException {
    this.rocketMQConsumer.unsubscribe(this.topic);
}

1.3 CannalMQConnector实现方法

1.3.1 getList

带阻塞时间

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@Override
public List<Message> getList(Long timeout, TimeUnit unit) throws CanalClientException {
    List<Message> messages = getListWithoutAck(timeout, unit);
    if (messages != null && !messages.isEmpty()) {
        ack();
    }
    return messages;
}

@Override
public List<Message> getListWithoutAck(Long timeout, TimeUnit unit) throws CanalClientException {
    try {
        if (this.lastGetBatchMessage != null) {
            throw new CanalClientException("mq get/ack not support concurrent & async ack");
        }

        ConsumerBatchMessage batchMessage = messageBlockingQueue.poll(timeout, unit);
        if (batchMessage != null) {
            this.lastGetBatchMessage = batchMessage;
            return batchMessage.getData();
        }
    } catch (InterruptedException ex) {
        logger.warn("Get message timeout", ex);
        throw new CanalClientException("Failed to fetch the data after: " + timeout);
    }
    return Lists.newArrayList();
}

1.3.2 getFlatList

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@Override
public List<FlatMessage> getFlatList(Long timeout, TimeUnit unit) throws CanalClientException {
    List<FlatMessage> messages = getFlatListWithoutAck(timeout, unit);
    if (messages != null && !messages.isEmpty()) {
        ack();
    }
    return messages;
}

@Override
public List<FlatMessage> getFlatListWithoutAck(Long timeout, TimeUnit unit) throws CanalClientException {
    try {
        if (this.lastGetBatchMessage != null) {
            throw new CanalClientException("mq get/ack not support concurrent & async ack");
        }

        ConsumerBatchMessage batchMessage = messageBlockingQueue.poll(timeout, unit);
        if (batchMessage != null) {
            this.lastGetBatchMessage = batchMessage;
            return batchMessage.getData();
        }
    } catch (InterruptedException ex) {
        logger.warn("Get message timeout", ex);
        throw new CanalClientException("Failed to fetch the data after: " + timeout);
    }
    return Lists.newArrayList();
}

1.3.3 ack

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@Override
public void ack() throws CanalClientException {
    try {
        if (this.lastGetBatchMessage != null) {
            this.lastGetBatchMessage.ack();
        }
    } catch (Throwable e) {
        if (this.lastGetBatchMessage != null) {
            this.lastGetBatchMessage.fail();
        }
    } finally {
        this.lastGetBatchMessage = null;
    }
}

@Override
public void ack(long batchId) throws CanalClientException {
    throw new CanalClientException("mq not support this method");
}

1.3.4 rollback

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@Override
public void rollback() throws CanalClientException {
    try {
        if (this.lastGetBatchMessage != null) {
            this.lastGetBatchMessage.fail();
        }
    } finally {
        this.lastGetBatchMessage = null;
    }
}

@Override
public void rollback(long batchId) throws CanalClientException {
    throw new CanalClientException("mq not support this method");
}

1.3.5 get

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public Message get(int batchSize) throws CanalClientException {
    throw new CanalClientException("mq not support this method");
}

@Override
public Message get(int batchSize, Long timeout, TimeUnit unit) throws CanalClientException {
    throw new CanalClientException("mq not support this method");
}

1.3.6 getWithoutAck

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@Override
public Message getWithoutAck(int batchSize) throws CanalClientException {
    throw new CanalClientException("mq not support this method");
}

@Override
public Message getWithoutAck(int batchSize, Long timeout, TimeUnit unit) throws CanalClientException {
    throw new CanalClientException("mq not support this method");
}

2. CanalConnectors

集群访问控制接口

CanalNodeAccessStrategy

源码：

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/**
 * 集群节点访问控制接口
 * 
 * @author jianghang 2012-10-29 下午07:55:41
 * @version 1.0.0
 */
public interface CanalNodeAccessStrategy {

    SocketAddress currentNode();

    SocketAddress nextNode();
}

2.1 SimpleNodeAccessStrategy

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/**
 * 简单版本的node访问实现
 * 
 * @author jianghang 2012-10-29 下午08:00:23
 * @version 1.0.0
 */
public class SimpleNodeAccessStrategy implements CanalNodeAccessStrategy {

    private List<SocketAddress> nodes = new ArrayList<>();
    private int                 index = 0;

    public SimpleNodeAccessStrategy(List<? extends SocketAddress> nodes){
        if (nodes == null || nodes.size() < 1) {
            throw new IllegalArgumentException("at least 1 node required.");
        }
        this.nodes.addAll(nodes);
    }

    @Override
    public SocketAddress nextNode() {
        try {
            return nodes.get(index);
        } finally {
            index = (index + 1) % nodes.size();
        }
    }

    @Override
    public SocketAddress currentNode() {
        return nodes.get(index);
    }

}

2.2 ClusterNodeAccessStrategy

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/**
 * 集群模式的调度策略
 * 
 * @author jianghang 2012-12-3 下午10:01:04
 * @version 1.0.0
 */
public class ClusterNodeAccessStrategy implements CanalNodeAccessStrategy {

    private String                           destination;
    private IZkChildListener                 childListener;                                      // 监听所有的服务器列表
    private IZkDataListener                  dataListener;                                       // 监听当前的工作节点
    private ZkClientx                        zkClient;
    private volatile List<InetSocketAddress> currentAddress = new ArrayList<>();
    private volatile InetSocketAddress       runningAddress = null;

    public ClusterNodeAccessStrategy(String destination, ZkClientx zkClient){
        this.destination = destination;
        this.zkClient = zkClient;
        // handleChildChange
        childListener = (parentPath, currentChilds) -> initClusters(currentChilds);

        dataListener = new IZkDataListener() {

            public void handleDataDeleted(String dataPath) throws Exception {
                runningAddress = null;
            }

            public void handleDataChange(String dataPath, Object data) throws Exception {
                initRunning(data);
            }

        };

        String clusterPath = ZookeeperPathUtils.getDestinationClusterRoot(destination);
        this.zkClient.subscribeChildChanges(clusterPath, childListener);
        initClusters(this.zkClient.getChildren(clusterPath));

        String runningPath = ZookeeperPathUtils.getDestinationServerRunning(destination);
        this.zkClient.subscribeDataChanges(runningPath, dataListener);
        initRunning(this.zkClient.readData(runningPath, true));
    }

    @Override
    public SocketAddress currentNode() {
        return nextNode();
    }

    @Override
    public SocketAddress nextNode() {
        if (runningAddress != null) {// 如果服务已经启动，直接选择当前正在工作的节点
            return runningAddress;
        } else if (!currentAddress.isEmpty()) { // 如果不存在已经启动的服务，可能服务是一种lazy启动，随机选择一台触发服务器进行启动
            return currentAddress.get(0);// 默认返回第一个节点，之前已经做过shuffle
        } else {
            throw new ServerNotFoundException("no alive canal server for " + destination);
        }
    }

    private void initClusters(List<String> currentChilds) {
        if (currentChilds == null || currentChilds.isEmpty()) {
            currentAddress = new ArrayList<>();
        } else {
            List<InetSocketAddress> addresses = new ArrayList<>();
            for (String address : currentChilds) {
                String[] strs = StringUtils.split(address, ":");
                if (strs != null && strs.length == 2) {
                    addresses.add(new InetSocketAddress(strs[0], Integer.parseInt(strs[1])));
                }
            }

            Collections.shuffle(addresses);
            currentAddress = addresses;// 直接切换引用
        }
    }

    private void initRunning(Object data) {
        if (data == null) {
            return;
        }

        ServerRunningData runningData = JsonUtils.unmarshalFromByte((byte[]) data, ServerRunningData.class);
        String[] strs = StringUtils.split(runningData.getAddress(), ':');
        if (strs.length == 2) {
            runningAddress = new InetSocketAddress(strs[0], Integer.parseInt(strs[1]));
        }
    }

    public void setZkClient(ZkClientx zkClient) {
        this.zkClient = zkClient;
    }

    public ZkClientx getZkClient() {
        return zkClient;
    }

}

2.3 CanalConnectors

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/**
 * canal connectors创建工具类
 * 
 * @author jianghang 2012-10-29 下午11:18:50
 * @version 1.0.0
 */
public class CanalConnectors {

    /**
     * 创建单链接的客户端链接
     *
     * @param address
     * @param destination
     * @param username
     * @param password
     * @return
     */
    public static CanalConnector newSingleConnector(SocketAddress address, String destination, String username,
                                                    String password) {
        SimpleCanalConnector canalConnector = new SimpleCanalConnector(address, username, password, destination);
        canalConnector.setSoTimeout(60 * 1000);
        canalConnector.setIdleTimeout(60 * 60 * 1000);
        return canalConnector;
    }

    /**
     * 创建带cluster模式的客户端链接，自动完成failover切换
     *
     * @param addresses
     * @param destination
     * @param username
     * @param password
     * @return
     */
    public static CanalConnector newClusterConnector(List<? extends SocketAddress> addresses, String destination,
                                                     String username, String password) {
        ClusterCanalConnector canalConnector = new ClusterCanalConnector(username,
            password,
            destination,
            new SimpleNodeAccessStrategy(addresses));
        canalConnector.setSoTimeout(60 * 1000);
        canalConnector.setIdleTimeout(60 * 60 * 1000);
        return canalConnector;
    }

    /**
     * 创建带cluster模式的客户端链接，自动完成failover切换，服务器列表自动扫描
     *
     * @param zkServers
     * @param destination
     * @param username
     * @param password
     * @return
     */
    public static CanalConnector newClusterConnector(String zkServers, String destination, String username,
                                                     String password) {
        ClusterCanalConnector canalConnector = new ClusterCanalConnector(username,
            password,
            destination,
            new ClusterNodeAccessStrategy(destination, ZkClientx.getZkClient(zkServers)));
        canalConnector.setSoTimeout(60 * 1000);
        canalConnector.setIdleTimeout(60 * 60 * 1000);
        return canalConnector;
    }
}

3. ConsumerBatchMessage

3.1 源码

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public class ConsumerBatchMessage<T> {

    private final List<T>  data;
    private CountDownLatch         latch;
    private boolean                hasFailure = false;

    public ConsumerBatchMessage(List<T> data){
        this.data = data;
        latch = new CountDownLatch(1);
    }

    public boolean waitFinish(long timeout) throws InterruptedException {
        return latch.await(timeout, TimeUnit.MILLISECONDS);
    }

    public boolean isSuccess() {
        return !hasFailure;
    }

    public List<T> getData() {
        return data;
    }

    /**
     * Countdown if the sub message is successful.
     */
    public void ack() {
        latch.countDown();
    }

    /**
     * Countdown and fail-fast if the sub message is failed.
     */
    public void fail() {
        hasFailure = true;
        // fail fast
        long count = latch.getCount();
        for (int i = 0; i < count; i++) {
            latch.countDown();
        }
    }
}

3.2 使用

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// 1. 阻塞在这里
isCompleted = batchMessage.waitFinish(batchProcessTimeout);

// 2. 等待lastMsg ack
if (this.lastGetBatchMessage != null) {
   this.lastGetBatchMessage.ack();
}

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