序
本文主要研究一下rocketmq的getOrCreateMQClientInstance
getOrCreateMQClientInstance
rocketmq-client-4.6.0-sources.jar!/org/apache/rocketmq/client/impl/MQClientManager.java
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>();
private MQClientManager() {
}
public static MQClientManager getInstance() {
return instance;
}
public MQClientInstance getOrCreateMQClientInstance(final ClientConfig clientConfig) {
return getOrCreateMQClientInstance(clientConfig, null);
}
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;
}
public void removeClientFactory(final String clientId) {
this.factoryTable.remove(clientId);
}
}- MQClientManager提供了getOrCreateMQClientInstance方法用于根据clientConfig及rpcHook来创建MQClientInstance；它使用factoryTable来存储clientId与MQClientInstance的映射关系，只要clientId是一样的，获取的就是相同的MQClientInstance；而clientId则由clientConfig.buildMQClientId()计算出来
ClientConfig
rocketmq-client-4.6.0-sources.jar!/org/apache/rocketmq/client/ClientConfig.java
public class ClientConfig {
public static final String SEND_MESSAGE_WITH_VIP_CHANNEL_PROPERTY = "com.rocketmq.sendMessageWithVIPChannel";
private String namesrvAddr = NameServerAddressUtils.getNameServerAddresses();
private String clientIP = RemotingUtil.getLocalAddress();
private String instanceName = System.getProperty("rocketmq.client.name", "DEFAULT");
private int clientCallbackExecutorThreads = Runtime.getRuntime().availableProcessors();
protected String namespace;
protected AccessChannel accessChannel = AccessChannel.LOCAL;
/**
* Pulling topic information interval from the named server
*/
private int pollNameServerInterval = 1000 * 30;
/**
* Heartbeat interval in microseconds with message broker
*/
private int heartbeatBrokerInterval = 1000 * 30;
/**
* Offset persistent interval for consumer
*/
private int persistConsumerOffsetInterval = 1000 * 5;
private long pullTimeDelayMillsWhenException = 1000;
private boolean unitMode = false;
private String unitName;
private boolean vipChannelEnabled = Boolean.parseBoolean(System.getProperty(SEND_MESSAGE_WITH_VIP_CHANNEL_PROPERTY, "false"));
private boolean useTLS = TlsSystemConfig.tlsEnable;
private LanguageCode language = LanguageCode.JAVA;
public String buildMQClientId() {
StringBuilder sb = new StringBuilder();
sb.append(this.getClientIP());
sb.append("@");
sb.append(this.getInstanceName());
if (!UtilAll.isBlank(this.unitName)) {
sb.append("@");
sb.append(this.unitName);
}
return sb.toString();
}
public String getClientIP() {
return clientIP;
}
public String getInstanceName() {
return instanceName;
}
public void changeInstanceNameToPID() {
if (this.instanceName.equals("DEFAULT")) {
this.instanceName = String.valueOf(UtilAll.getPid());
}
}
//......
}- ClientConfig的buildMQClientId会根据clientIP、instanceName、unitName来构建；clientIP默认值为RemotingUtil.getLocalAddress()；instanceName默认值为System.getProperty("rocketmq.client.name", "DEFAULT")；ClientConfig还提供了一个changeInstanceNameToPID方法，在instanceName值为默认值的时候，将其改为UtilAll.getPid()；unitName默认为空
DefaultMQProducerImpl.start
rocketmq-client-4.6.0-sources.jar!/org/apache/rocketmq/client/impl/producer/DefaultMQProducerImpl.java
public class DefaultMQProducerImpl implements MQProducerInner {
//......
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();
}
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) {
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);
}
//......
}- DefaultMQProducerImpl的start方法在defaultMQProducer.getProducerGroup().equals(MixAll.CLIENT_INNER_PRODUCER_GROUP)为false的时候，会执行defaultMQProducer.changeInstanceNameToPID()方法
DefaultMQPushConsumerImpl.start
rocketmq-client-4.6.0-sources.jar!/org/apache/rocketmq/client/impl/consumer/DefaultMQPushConsumerImpl.java
public class DefaultMQPushConsumerImpl implements MQConsumerInner {
//......
public synchronized void start() throws MQClientException {
switch (this.serviceState) {
case CREATE_JUST:
log.info("the consumer [{}] start beginning. messageModel={}, isUnitMode={}", this.defaultMQPushConsumer.getConsumerGroup(),
this.defaultMQPushConsumer.getMessageModel(), this.defaultMQPushConsumer.isUnitMode());
this.serviceState = ServiceState.START_FAILED;
this.checkConfig();
this.copySubscription();
if (this.defaultMQPushConsumer.getMessageModel() == MessageModel.CLUSTERING) {
this.defaultMQPushConsumer.changeInstanceNameToPID();
}
this.mQClientFactory = MQClientManager.getInstance().getOrCreateMQClientInstance(this.defaultMQPushConsumer, this.rpcHook);
this.rebalanceImpl.setConsumerGroup(this.defaultMQPushConsumer.getConsumerGroup());
this.rebalanceImpl.setMessageModel(this.defaultMQPushConsumer.getMessageModel());
this.rebalanceImpl.setAllocateMessageQueueStrategy(this.defaultMQPushConsumer.getAllocateMessageQueueStrategy());
this.rebalanceImpl.setmQClientFactory(this.mQClientFactory);
this.pullAPIWrapper = new PullAPIWrapper(
mQClientFactory,
this.defaultMQPushConsumer.getConsumerGroup(), isUnitMode());
this.pullAPIWrapper.registerFilterMessageHook(filterMessageHookList);
if (this.defaultMQPushConsumer.getOffsetStore() != null) {
this.offsetStore = this.defaultMQPushConsumer.getOffsetStore();
} else {
switch (this.defaultMQPushConsumer.getMessageModel()) {
case BROADCASTING:
this.offsetStore = new LocalFileOffsetStore(this.mQClientFactory, this.defaultMQPushConsumer.getConsumerGroup());
break;
case CLUSTERING:
this.offsetStore = new RemoteBrokerOffsetStore(this.mQClientFactory, this.defaultMQPushConsumer.getConsumerGroup());
break;
default:
break;
}
this.defaultMQPushConsumer.setOffsetStore(this.offsetStore);
}
this.offsetStore.load();
if (this.getMessageListenerInner() instanceof MessageListenerOrderly) {
this.consumeOrderly = true;
this.consumeMessageService =
new ConsumeMessageOrderlyService(this, (MessageListenerOrderly) this.getMessageListenerInner());
} else if (this.getMessageListenerInner() instanceof MessageListenerConcurrently) {
this.consumeOrderly = false;
this.consumeMessageService =
new ConsumeMessageConcurrentlyService(this, (MessageListenerConcurrently) this.getMessageListenerInner());
}
this.consumeMessageService.start();
boolean registerOK = mQClientFactory.registerConsumer(this.defaultMQPushConsumer.getConsumerGroup(), this);
if (!registerOK) {
this.serviceState = ServiceState.CREATE_JUST;
this.consumeMessageService.shutdown();
throw new MQClientException("The consumer group[" + this.defaultMQPushConsumer.getConsumerGroup()
+ "] has been created before, specify another name please." + FAQUrl.suggestTodo(FAQUrl.GROUP_NAME_DUPLICATE_URL),
null);
}
mQClientFactory.start();
log.info("the consumer [{}] start OK.", this.defaultMQPushConsumer.getConsumerGroup());
this.serviceState = ServiceState.RUNNING;
break;
case RUNNING:
case START_FAILED:
case SHUTDOWN_ALREADY:
throw new MQClientException("The PushConsumer service state not OK, maybe started once, "
+ this.serviceState
+ FAQUrl.suggestTodo(FAQUrl.CLIENT_SERVICE_NOT_OK),
null);
default:
break;
}
this.updateTopicSubscribeInfoWhenSubscriptionChanged();
this.mQClientFactory.checkClientInBroker();
this.mQClientFactory.sendHeartbeatToAllBrokerWithLock();
this.mQClientFactory.rebalanceImmediately();
}
//......
}- DefaultMQPushConsumerImpl的start方法在defaultMQPushConsumer.getMessageModel()为MessageModel.CLUSTERING时，会执行defaultMQPushConsumer.changeInstanceNameToPID()方法
RocketMQUtil.getInstanceName
rocketmq-spring-boot/2.0.4/rocketmq-spring-boot-2.0.4-sources.jar!/org/apache/rocketmq/spring/support/RocketMQUtil.java
public class RocketMQUtil {
//......
public static String getInstanceName(RPCHook rpcHook, String identify) {
String separator = "|";
StringBuilder instanceName = new StringBuilder();
SessionCredentials sessionCredentials = ((AclClientRPCHook)rpcHook).getSessionCredentials();
instanceName.append(sessionCredentials.getAccessKey())
.append(separator).append(sessionCredentials.getSecretKey())
.append(separator).append(identify)
.append(separator).append(UtilAll.getPid());
return instanceName.toString();
}
//......
}- RocketMQUtil提供了getInstanceName方法，它根据rpcHook的信息、identify以及UtilAll.getPid()来构建
initRocketMQPushConsumer
rocketmq-spring-boot-2.0.4-sources.jar!/org/apache/rocketmq/spring/support/DefaultRocketMQListenerContainer.java
public class DefaultRocketMQListenerContainer implements InitializingBean,
RocketMQListenerContainer, SmartLifecycle, ApplicationContextAware {
private final static Logger log = LoggerFactory.getLogger(DefaultRocketMQListenerContainer.class);
private ApplicationContext applicationContext;
//......
private void initRocketMQPushConsumer() throws MQClientException {
Assert.notNull(rocketMQListener, "Property 'rocketMQListener' is required");
Assert.notNull(consumerGroup, "Property 'consumerGroup' is required");
Assert.notNull(nameServer, "Property 'nameServer' is required");
Assert.notNull(topic, "Property 'topic' is required");
RPCHook rpcHook = RocketMQUtil.getRPCHookByAkSk(applicationContext.getEnvironment(),
this.rocketMQMessageListener.accessKey(), this.rocketMQMessageListener.secretKey());
boolean enableMsgTrace = rocketMQMessageListener.enableMsgTrace();
if (Objects.nonNull(rpcHook)) {
consumer = new DefaultMQPushConsumer(consumerGroup, rpcHook, new AllocateMessageQueueAveragely(),
enableMsgTrace, this.applicationContext.getEnvironment().
resolveRequiredPlaceholders(this.rocketMQMessageListener.customizedTraceTopic()));
consumer.setVipChannelEnabled(false);
consumer.setInstanceName(RocketMQUtil.getInstanceName(rpcHook, consumerGroup));
} else {
log.debug("Access-key or secret-key not configure in " + this + ".");
consumer = new DefaultMQPushConsumer(consumerGroup, enableMsgTrace,
this.applicationContext.getEnvironment().
resolveRequiredPlaceholders(this.rocketMQMessageListener.customizedTraceTopic()));
}
String customizedNameServer = this.applicationContext.getEnvironment().resolveRequiredPlaceholders(this.rocketMQMessageListener.nameServer());
if (customizedNameServer != null) {
consumer.setNamesrvAddr(customizedNameServer);
} else {
consumer.setNamesrvAddr(nameServer);
}
if (accessChannel != null) {
consumer.setAccessChannel(accessChannel);
}
consumer.setConsumeThreadMax(consumeThreadMax);
if (consumeThreadMax < consumer.getConsumeThreadMin()) {
consumer.setConsumeThreadMin(consumeThreadMax);
}
consumer.setConsumeTimeout(consumeTimeout);
switch (messageModel) {
case BROADCASTING:
consumer.setMessageModel(org.apache.rocketmq.common.protocol.heartbeat.MessageModel.BROADCASTING);
break;
case CLUSTERING:
consumer.setMessageModel(org.apache.rocketmq.common.protocol.heartbeat.MessageModel.CLUSTERING);
break;
default:
throw new IllegalArgumentException("Property 'messageModel' was wrong.");
}
switch (selectorType) {
case TAG:
consumer.subscribe(topic, selectorExpression);
break;
case SQL92:
consumer.subscribe(topic, MessageSelector.bySql(selectorExpression));
break;
default:
throw new IllegalArgumentException("Property 'selectorType' was wrong.");
}
switch (consumeMode) {
case ORDERLY:
consumer.setMessageListener(new DefaultMessageListenerOrderly());
break;
case CONCURRENTLY:
consumer.setMessageListener(new DefaultMessageListenerConcurrently());
break;
default:
throw new IllegalArgumentException("Property 'consumeMode' was wrong.");
}
if (rocketMQListener instanceof RocketMQPushConsumerLifecycleListener) {
((RocketMQPushConsumerLifecycleListener) rocketMQListener).prepareStart(consumer);
}
}
//......
}- DefaultRocketMQListenerContainer的initRocketMQPushConsumer方法在rpcHook不为null的时候，会使用RocketMQUtil.getInstanceName(rpcHook, consumerGroup)来设置consumer的instanceName
createTransactionMQProducer
rocketmq-spring-boot/2.0.4/rocketmq-spring-boot-2.0.4-sources.jar!/org/apache/rocketmq/spring/core/RocketMQTemplate.java
public class RocketMQTemplate extends AbstractMessageSendingTemplate<String> implements InitializingBean, DisposableBean {
private static final Logger log = LoggerFactory.getLogger(RocketMQTemplate.class);
private DefaultMQProducer producer;
//......
private TransactionMQProducer createTransactionMQProducer(String name,
RocketMQLocalTransactionListener transactionListener,
ExecutorService executorService, RPCHook rpcHook) {
Assert.notNull(producer, "Property 'producer' is required");
Assert.notNull(transactionListener, "Parameter 'transactionListener' is required");
TransactionMQProducer txProducer;
if (Objects.nonNull(rpcHook)) {
txProducer = new TransactionMQProducer(name, rpcHook);
txProducer.setVipChannelEnabled(false);
txProducer.setInstanceName(RocketMQUtil.getInstanceName(rpcHook, name));
} else {
txProducer = new TransactionMQProducer(name);
}
txProducer.setTransactionListener(RocketMQUtil.convert(transactionListener));
txProducer.setNamespace(producer.getNamespace());
txProducer.setNamesrvAddr(producer.getNamesrvAddr());
if (executorService != null) {
txProducer.setExecutorService(executorService);
}
txProducer.setSendMsgTimeout(producer.getSendMsgTimeout());
txProducer.setRetryTimesWhenSendFailed(producer.getRetryTimesWhenSendFailed());
txProducer.setRetryTimesWhenSendAsyncFailed(producer.getRetryTimesWhenSendAsyncFailed());
txProducer.setMaxMessageSize(producer.getMaxMessageSize());
txProducer.setCompressMsgBodyOverHowmuch(producer.getCompressMsgBodyOverHowmuch());
txProducer.setRetryAnotherBrokerWhenNotStoreOK(producer.isRetryAnotherBrokerWhenNotStoreOK());
return txProducer;
}
//......
}- RocketMQTemplate的createTransactionMQProducer方法在rpcHook不为null的时候会使用RocketMQUtil.getInstanceName(rpcHook, name)来设置txProducer的instanceName
小结
- MQClientManager提供了getOrCreateMQClientInstance方法用于根据clientConfig及rpcHook来创建MQClientInstance；它使用factoryTable来存储clientId与MQClientInstance的映射关系，只要clientId是一样的，获取的就是相同的MQClientInstance；而clientId则由clientConfig.buildMQClientId()计算出来
- ClientConfig的buildMQClientId会根据clientIP、instanceName、unitName来构建；clientIP默认值为RemotingUtil.getLocalAddress()；instanceName默认值为System.getProperty("rocketmq.client.name", "DEFAULT")；ClientConfig还提供了一个changeInstanceNameToPID方法，在instanceName值为默认值的时候，将其改为UtilAll.getPid()；unitName默认为空
- RocketMQUtil提供了getInstanceName方法，它根据rpcHook的信息、identify以及UtilAll.getPid()来构建；DefaultRocketMQListenerContainer的initRocketMQPushConsumer方法在rpcHook不为null的时候，会使用RocketMQUtil.getInstanceName(rpcHook, consumerGroup)来设置consumer的instanceName；RocketMQTemplate的createTransactionMQProducer方法在rpcHook不为null的时候会使用RocketMQUtil.getInstanceName(rpcHook, name)来设置txProducer的instanceName