系列
开篇
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这个系列的主要目的是介绍RocketMq producer的原理和用法，在这个系列当中会介绍 producer的启动流程、producer的路由同步、producer的消息发送流程。
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这篇文章主要producer的启动流程，主要介绍producer启动的流程、各类client以及各类定时任务。
producer启动流程
producer启动流程
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producer启动过程需要创建DefaultMQProducer对象，DefaultMQProducer内部DefaultMQProducerImpl对象。
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DefaultMQProducer#start执行DefaultMQProducerImpl#start，DefaultMQProducerImpl的start过程会通过MQClientManager创建MQClientInstance。
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MQClientInstance#start是producer启动流程中的最核心流程，包括所有服务的启动以及定时任务的启动。
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MQClientInstance#start执行mQClientAPIImpl.start()，负责NettyRemotingClient的启动。
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MQClientInstance#start执行startScheduledTask，启动包括获取路由信息等定时任务。
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startScheduledTask定时任务会执行fetchNameServerAddr、updateTopicRouteInfoFromNameServer、cleanOfflineBroker、sendHeartbeatToAllBrokerWithLock、persistAllConsumerOffset、adjustThreadPool等核心任务。
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MQClientInstance#start执行pullMessageService.start()，负责PullMessageService的启动。
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MQClientInstance#start执行rebalanceService.start()，负责RebalanceService的启动。
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MQClientInstance作为producer的核心对象，负责了几乎所有模块的启动，在consumer侧同样会用到该核心对象，所以MQClientInstance的启动会启动一些consumer侧的服务。
producer启动源码分析
public class Producer {
public static void main(String[] args) throws MQClientException, InterruptedException {
// 1、创建producer对象
DefaultMQProducer producer = new DefaultMQProducer("please_rename_unique_group_name");
producer.setNamesrvAddr("localhost:9876");
// 2、启动producer对象
producer.start();
// 3、producer发送消息
for (int i = 0; i < 1000; i++) {
try {
Message msg = new Message("TopicTest" /* Topic */,
"TagA" /* Tag */,
("Hello RocketMQ " + i).getBytes(RemotingHelper.DEFAULT_CHARSET) /* Message body */
);
SendResult sendResult = producer.send(msg);
System.out.printf("%s%n", sendResult);
} catch (Exception e) {
e.printStackTrace();
Thread.sleep(1000);
}
}
producer.shutdown();
}
}
- producer的使用按照三步走：创建producer对象、启动producer对象、发送message，这里暂且值分析前两步。
- new DefaultMQProducer("producer_group_name")负责创建producer对象。
- producer.start()负责启动producer对象。
DefaultMQProducer
public class DefaultMQProducer extends ClientConfig implements MQProducer {
protected final transient DefaultMQProducerImpl defaultMQProducerImpl;
public DefaultMQProducer(final String producerGroup) {
this(null, producerGroup, null);
}
public DefaultMQProducer(final String producerGroup, RPCHook rpcHook, boolean enableMsgTrace,
final String customizedTraceTopic) {
this.producerGroup = producerGroup;
defaultMQProducerImpl = new DefaultMQProducerImpl(this, rpcHook);
if (enableMsgTrace) {
try {
AsyncTraceDispatcher dispatcher = new AsyncTraceDispatcher(producerGroup, TraceDispatcher.Type.PRODUCE, customizedTraceTopic, rpcHook);
dispatcher.setHostProducer(this.defaultMQProducerImpl);
traceDispatcher = dispatcher;
this.defaultMQProducerImpl.registerSendMessageHook(
new SendMessageTraceHookImpl(traceDispatcher));
} catch (Throwable e) {
log.error("system mqtrace hook init failed ,maybe can't send msg trace data");
}
}
}
}
- DefaultMQProducer的构造函数中会创建DefaultMQProducerImpl对象。
public class DefaultMQProducer extends ClientConfig implements MQProducer {
protected final transient DefaultMQProducerImpl defaultMQProducerImpl;
public void start() throws MQClientException {
this.setProducerGroup(withNamespace(this.producerGroup));
// 启动defaultMQProducerImpl
this.defaultMQProducerImpl.start();
if (null != traceDispatcher) {
try {
traceDispatcher.start(this.getNamesrvAddr(), this.getAccessChannel());
} catch (MQClientException e) {
log.warn("trace dispatcher start failed ", e);
}
}
}
}
- DefaultMQProducer#start会执行defaultMQProducerImpl.start()
public class DefaultMQProducerImpl implements MQProducerInner {
private MQClientInstance mQClientFactory;
public void start() throws MQClientException {
this.start(true);
}
public void start(final boolean startFactory) throws MQClientException {
switch (this.serviceState) {
case CREATE_JUST:
this.serviceState = ServiceState.START_FAILED;
this.checkConfig();
if (!this.defaultMQProducer.getProducerGroup().equals(MixAll.CLIENT_INNER_PRODUCER_GROUP)) {
this.defaultMQProducer.changeInstanceNameToPID();
}
// 1、创建MQClientInstance对象
this.mQClientFactory = MQClientManager.getInstance().getOrCreateMQClientInstance(this.defaultMQProducer, rpcHook);
boolean registerOK = mQClientFactory.registerProducer(this.defaultMQProducer.getProducerGroup(), this);
if (!registerOK) {
this.serviceState = ServiceState.CREATE_JUST;
throw new MQClientException("The producer group[" + this.defaultMQProducer.getProducerGroup()
+ "] has been created before, specify another name please." + FAQUrl.suggestTodo(FAQUrl.GROUP_NAME_DUPLICATE_URL),
null);
}
this.topicPublishInfoTable.put(this.defaultMQProducer.getCreateTopicKey(), new TopicPublishInfo());
if (startFactory) {
// 2、启动MQClientInstance
mQClientFactory.start();
}
log.info("the producer [{}] start OK. sendMessageWithVIPChannel={}", this.defaultMQProducer.getProducerGroup(),
this.defaultMQProducer.isSendMessageWithVIPChannel());
this.serviceState = ServiceState.RUNNING;
break;
case RUNNING:
case START_FAILED:
case SHUTDOWN_ALREADY:
throw new MQClientException("The producer service state not OK, maybe started once, "
+ this.serviceState
+ FAQUrl.suggestTodo(FAQUrl.CLIENT_SERVICE_NOT_OK),
null);
default:
break;
}
this.mQClientFactory.sendHeartbeatToAllBrokerWithLock();
this.timer.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
try {
RequestFutureTable.scanExpiredRequest();
} catch (Throwable e) {
log.error("scan RequestFutureTable exception", e);
}
}
}, 1000 * 3, 1000);
}
}
public class MQClientManager {
private final static InternalLogger log = ClientLogger.getLog();
private static MQClientManager instance = new MQClientManager();
private AtomicInteger factoryIndexGenerator = new AtomicInteger();
private ConcurrentMap<String/* clientId */, MQClientInstance> factoryTable =
new ConcurrentHashMap<String, MQClientInstance>();
public MQClientInstance getOrCreateMQClientInstance(final ClientConfig clientConfig, RPCHook rpcHook) {
String clientId = clientConfig.buildMQClientId();
MQClientInstance instance = this.factoryTable.get(clientId);
if (null == instance) {
instance =
new MQClientInstance(clientConfig.cloneClientConfig(),
this.factoryIndexGenerator.getAndIncrement(), clientId, rpcHook);
MQClientInstance prev = this.factoryTable.putIfAbsent(clientId, instance);
if (prev != null) {
instance = prev;
log.warn("Returned Previous MQClientInstance for clientId:[{}]", clientId);
} else {
log.info("Created new MQClientInstance for clientId:[{}]", clientId);
}
}
return instance;
}
}
- MQClientManager.getInstance().getOrCreateMQClientInstance()负责创建MQClientInstance对象。
- mQClientFactory.start()调用MQClientInstance.start()负责MQClientInstance的启动。
public class MQClientInstance {
public void start() throws MQClientException {
synchronized (this) {
switch (this.serviceState) {
case CREATE_JUST:
this.serviceState = ServiceState.START_FAILED;
// If not specified,looking address from name server
if (null == this.clientConfig.getNamesrvAddr()) {
this.mQClientAPIImpl.fetchNameServerAddr();
}
// Start request-response channel
this.mQClientAPIImpl.start();
// Start various schedule tasks
this.startScheduledTask();
// Start pull service
this.pullMessageService.start();
// Start rebalance service
this.rebalanceService.start();
// Start push service
this.defaultMQProducer.getDefaultMQProducerImpl().start(false);
log.info("the client factory [{}] start OK", this.clientId);
this.serviceState = ServiceState.RUNNING;
break;
case START_FAILED:
throw new MQClientException("The Factory object[" + this.getClientId() + "] has been created before, and failed.", null);
default:
break;
}
}
}
}
- producer的mQClientAPIImpl.start()负责启动NettyClient用以通信。
- producer的startScheduledTask()负责启动各类定时任务。
public class NettyRemotingClient extends NettyRemotingAbstract implements RemotingClient {
private static final long LOCK_TIMEOUT_MILLIS = 3000;
private final NettyClientConfig nettyClientConfig;
private final Bootstrap bootstrap = new Bootstrap();
public void start() {
this.defaultEventExecutorGroup = new DefaultEventExecutorGroup(
nettyClientConfig.getClientWorkerThreads(),
new ThreadFactory() {
private AtomicInteger threadIndex = new AtomicInteger(0);
@Override
public Thread newThread(Runnable r) {
return new Thread(r, "NettyClientWorkerThread_" + this.threadIndex.incrementAndGet());
}
});
Bootstrap handler = this.bootstrap.group(this.eventLoopGroupWorker).channel(NioSocketChannel.class)
.option(ChannelOption.TCP_NODELAY, true)
.option(ChannelOption.SO_KEEPALIVE, false)
.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, nettyClientConfig.getConnectTimeoutMillis())
.option(ChannelOption.SO_SNDBUF, nettyClientConfig.getClientSocketSndBufSize())
.option(ChannelOption.SO_RCVBUF, nettyClientConfig.getClientSocketRcvBufSize())
.handler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch) throws Exception {
ChannelPipeline pipeline = ch.pipeline();
if (nettyClientConfig.isUseTLS()) {
if (null != sslContext) {
pipeline.addFirst(defaultEventExecutorGroup, "sslHandler", sslContext.newHandler(ch.alloc()));
log.info("Prepend SSL handler");
} else {
log.warn("Connections are insecure as SSLContext is null!");
}
}
pipeline.addLast(
defaultEventExecutorGroup,
new NettyEncoder(),
new NettyDecoder(),
new IdleStateHandler(0, 0, nettyClientConfig.getClientChannelMaxIdleTimeSeconds()),
new NettyConnectManageHandler(),
new NettyClientHandler());
}
});
this.timer.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
try {
NettyRemotingClient.this.scanResponseTable();
} catch (Throwable e) {
log.error("scanResponseTable exception", e);
}
}
}, 1000 * 3, 1000);
if (this.channelEventListener != null) {
this.nettyEventExecutor.start();
}
}
}
- 负责NettyRemotingClient的启动。
public class MQClientInstance {
private void startScheduledTask() {
if (null == this.clientConfig.getNamesrvAddr()) {
this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
try {
MQClientInstance.this.mQClientAPIImpl.fetchNameServerAddr();
} catch (Exception e) {
log.error("ScheduledTask fetchNameServerAddr exception", e);
}
}
}, 1000 * 10, 1000 * 60 * 2, TimeUnit.MILLISECONDS);
}
this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
try {
MQClientInstance.this.updateTopicRouteInfoFromNameServer();
} catch (Exception e) {
log.error("ScheduledTask updateTopicRouteInfoFromNameServer exception", e);
}
}
}, 10, this.clientConfig.getPollNameServerInterval(), TimeUnit.MILLISECONDS);
this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
try {
MQClientInstance.this.cleanOfflineBroker();
MQClientInstance.this.sendHeartbeatToAllBrokerWithLock();
} catch (Exception e) {
log.error("ScheduledTask sendHeartbeatToAllBroker exception", e);
}
}
}, 1000, this.clientConfig.getHeartbeatBrokerInterval(), TimeUnit.MILLISECONDS);
this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
try {
MQClientInstance.this.persistAllConsumerOffset();
} catch (Exception e) {
log.error("ScheduledTask persistAllConsumerOffset exception", e);
}
}
}, 1000 * 10, this.clientConfig.getPersistConsumerOffsetInterval(), TimeUnit.MILLISECONDS);
this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
try {
MQClientInstance.this.adjustThreadPool();
} catch (Exception e) {
log.error("ScheduledTask adjustThreadPool exception", e);
}
}
}, 1, 1, TimeUnit.MINUTES);
}
}
- producer的updateTopicRouteInfoFromNameServer负责更新路由信息，会用于消息的发送。
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