消息中间件 RocketMQ 源码解析 —— 调试环境搭建
点击上方“芋道源码”,选择“设为星标”
做积极的人,而不是积极废人!
源码精品专栏
摘要: 原创出处 http://www.iocoder.cn/RocketMQ/build-debugging-environment/ 「芋道源码」欢迎转载,保留摘要,谢谢!
0. 友情提示
1. 依赖工具
2. 源码拉取
3. 启动 RocketMQ Namesrv
4. 启动 RocketMQ Broker
5. 启动 RocketMQ Producer
6. 启动 RocketMQ Consumer
666. 彩蛋
0. 友情提示
阅读源码之前,建议胖友对 RocketMQ 的文档已经熟读。目前 RocketMQ 4 的中文文档很少,所以英文不太好的胖友,推荐看看如下资料:
《RocketMQ 用户指南》 基于 RocketMQ 3 的版本。
《RocketMQ 原理简介》 基于 RocketMQ 3 的版本。
《RocketMQ 最佳实践》 基于 RocketMQ 3 的版本。
《阿里云 —— 消息队列 MQ》 阿里云的消息队列,就是 RocketMQ 的云服务。
1. 依赖工具
JDK :1.8+
Maven
IntelliJ IDEA
2. 源码拉取
从官方仓库 [https://github.com/apache/rocketmq) Fork
出属于自己的仓库。为什么要 Fork
?既然开始阅读、调试源码,我们可能会写一些注释,有了自己的仓库,可以进行自由的提交。😈
使用 IntelliJ IDEA
从 Fork
出来的仓库拉取代码。拉取完成后,Maven
会下载依赖包,可能会花费一些时间,耐心等待下。
在等待的过程中,我来简单说下,搭建调试环境的过程:
启动 RocketMQ Namesrv
启动 RocketMQ Broker
启动 RocketMQ Producer
启动 RocketMQ Consumer
最小化的 RocketMQ 的环境,暂时不考虑 Namesrv 集群、Broker 集群、Consumer 集群。
😈 另外,本文使用的 RocketMQ 版本是 4.4.0-SNAPSHOT
。
3. 启动 RocketMQ Namesrv
打开 org.apache.rocketmq.namesrv.NameServerInstanceTest
单元测试类,参考 #startup()
方法,我们编写 #main(String[] args)
静态方法,代码如下:
// NameServerInstanceTest.java
public static void main(String[] args) throws Exception {
// NamesrvConfig 配置
final NamesrvConfig namesrvConfig = new NamesrvConfig();
// NettyServerConfig 配置
final NettyServerConfig nettyServerConfig = new NettyServerConfig();
nettyServerConfig.setListenPort(9876); // 设置端口
// 创建 NamesrvController 对象,并启动
NamesrvController namesrvController = new NamesrvController(namesrvConfig, nettyServerConfig);
namesrvController.initialize();
namesrvController.start();
// 睡觉,就不起来
Thread.sleep(DateUtils.MILLIS_PER_DAY);
}
然后,右键运行,RocketMQ Namesrv 就启动完成。输出日志如下:
17:54:03.354 [NettyEventExecutor] INFO RocketmqRemoting - NettyEventExecutor service started
17:54:03.355 [FileWatchService] INFO RocketmqCommon - FileWatchService service started
最后,这是一个可选的步骤,命令行中输入 telnet 127.0.0.1 9876
,看看是否能连接上 RocketMQ Namesrv 。
4. 启动 RocketMQ Broker
打开 org.apache.rocketmq.broker.BrokerControllerTest
单元测试类,参考 #testBrokerRestart()
方法,我们编写 #main(String[] args)
方法,代码如下:
// BrokerControllerTest.java
public static void main(String[] args) throws Exception {
// 设置版本号
System.setProperty(RemotingCommand.REMOTING_VERSION_KEY, Integer.toString(MQVersion.CURRENT_VERSION));
// NettyServerConfig 配置
final NettyServerConfig nettyServerConfig = new NettyServerConfig();
nettyServerConfig.setListenPort(10911);
// BrokerConfig 配置
final BrokerConfig brokerConfig = new BrokerConfig();
brokerConfig.setBrokerName("broker-a");
brokerConfig.setNamesrvAddr("127.0.0.1:9876");
// MessageStoreConfig 配置
final MessageStoreConfig messageStoreConfig = new MessageStoreConfig();
messageStoreConfig.setDeleteWhen("04");
messageStoreConfig.setFileReservedTime(48);
messageStoreConfig.setFlushDiskType(FlushDiskType.ASYNC_FLUSH);
messageStoreConfig.setDuplicationEnable(false);
// BrokerPathConfigHelper.setBrokerConfigPath("/Users/yunai/百度云同步盘/开发/Javascript/Story/incubator-rocketmq/conf/broker.conf");
// 创建 BrokerController 对象,并启动
BrokerController brokerController = new BrokerController(//
brokerConfig, //
nettyServerConfig, //
new NettyClientConfig(), //
messageStoreConfig);
brokerController.initialize();
brokerController.start();
// 睡觉,就不起来
System.out.println("你猜");
Thread.sleep(DateUtils.MILLIS_PER_DAY);
}
然后,右键运行,RocketMQ Broker 就启动完成了。输出日志如下:
你猜
不要懵逼,我们打开下 RocketMQ Namesrv 那,已经输出日志如下:
18:17:30.443 [NettyServerCodecThread_5] INFO RocketmqRemoting - NETTY SERVER PIPELINE: channelRegistered 127.0.0.1:63847
18:17:30.443 [NettyServerCodecThread_5] INFO RocketmqRemoting - NETTY SERVER PIPELINE: channelActive, the channel[127.0.0.1:63847]
18:17:30.457 [RemotingExecutorThread_4] DEBUG RocketmqNamesrv - receive request, 103 127.0.0.1:63847 RemotingCommand [code=103, language=JAVA, version=275, opaque=0, flag(B)=0, remark=null, extFields={brokerId=0, bodyCrc32=1880081823, clusterName=DefaultCluster, brokerAddr=192.168.3.26:10911, haServerAddr=192.168.3.26:10912, compressed=false, brokerName=broker-a}, serializeTypeCurrentRPC=JSON]
18:17:30.458 [RemotingExecutorThread_4] INFO RocketmqNamesrv - new topic registered, BenchmarkTest QueueData [brokerName=broker-a, readQueueNums=1024, writeQueueNums=1024, perm=6, topicSynFlag=0]
18:17:30.458 [RemotingExecutorThread_4] INFO RocketmqNamesrv - new topic registered, OFFSET_MOVED_EVENT QueueData [brokerName=broker-a, readQueueNums=1, writeQueueNums=1, perm=6, topicSynFlag=0]
18:17:30.458 [RemotingExecutorThread_4] INFO RocketmqNamesrv - new topic registered, broker-a QueueData [brokerName=broker-a, readQueueNums=1, writeQueueNums=1, perm=7, topicSynFlag=0]
18:17:30.458 [RemotingExecutorThread_4] INFO RocketmqNamesrv - new topic registered, TBW102 QueueData [brokerName=broker-a, readQueueNums=8, writeQueueNums=8, perm=7, topicSynFlag=0]
18:17:30.458 [RemotingExecutorThread_4] INFO RocketmqNamesrv - new topic registered, SELF_TEST_TOPIC QueueData [brokerName=broker-a, readQueueNums=1, writeQueueNums=1, perm=6, topicSynFlag=0]
18:17:30.458 [RemotingExecutorThread_4] INFO RocketmqNamesrv - new topic registered, DefaultCluster QueueData [brokerName=broker-a, readQueueNums=16, writeQueueNums=16, perm=7, topicSynFlag=0]
18:17:30.458 [RemotingExecutorThread_4] INFO RocketmqNamesrv - new broker registered, 192.168.3.26:10911 HAServer: 192.168.3.26:10912妥妥的,原来 RocketMQ Broker 已经启动完成,并且注册到 RocketMQ Namesrv 上。
最后,这是一个可选的步骤,命令行中输入 telnet 127.0.0.1 10911
,看看是否能连接上 RocketMQ Broker 。
5. 启动 RocketMQ Producer
打开 org.apache.rocketmq.example.quickstart.Producer
示例类,代码如下:
// Producer.java
/**
* This class demonstrates how to send messages to brokers using provided {@link DefaultMQProducer}.
*/
public class Producer {
public static void main(String[] args) throws MQClientException, InterruptedException {
/*
* Instantiate with a producer group name.
*/
DefaultMQProducer producer = new DefaultMQProducer("please_rename_unique_group_name");
/*
* Specify name server addresses.
* <p/>
*
* Alternatively, you may specify name server addresses via exporting environmental variable: NAMESRV_ADDR
* <pre>
* {@code
* producer.setNamesrvAddr("name-server1-ip:9876;name-server2-ip:9876");
* }
* </pre>
*/
/*
* Launch the instance.
*/
producer.setNamesrvAddr("127.0.0.1:9876"); // <x> 哈哈哈哈
producer.start();
for (int i = 0; i < 1000; i++) {
try {
/*
* Create a message instance, specifying topic, tag and message body.
*/
Message msg = new Message("TopicTest" /* Topic */,
"TagA" /* Tag */,
("Hello RocketMQ " + i).getBytes(RemotingHelper.DEFAULT_CHARSET) /* Message body */
);
/*
* Call send message to deliver message to one of brokers.
*/
SendResult sendResult = producer.send(msg);
System.out.printf("%s%n", sendResult);
} catch (Exception e) {
e.printStackTrace();
Thread.sleep(1000);
}
}
/*
* Shut down once the producer instance is not longer in use.
*/
producer.shutdown();
}
}
注意,在 哈哈哈哈处,我们增加了
producer.setNamesrvAddr("127.0.0.1:9876")
代码块,指明 Producer 使用的 RocketMQ Namesrv 。😈 可能会有胖友会问,为什么指定的不是 RocketMQ Broker 呢?请退回到 「0. 友情提示」 。
然后,右键运行,RocketMQ Producer 就启动完成。输出日志如下:
18:22:13.507 [main] DEBUG i.n.u.i.l.InternalLoggerFactory - Using SLF4J as the default logging framework
SendResult [sendStatus=SEND_OK, msgId=C0A8031AE91718B4AAC27A6364050000, offsetMsgId=C0A8031A00002A9F0000000000000000, messageQueue=MessageQueue [topic=TopicTest, brokerName=broker-a, queueId=1], queueOffset=0]
// ... 中间省略 N 条 ...
SendResult [sendStatus=SEND_OK, msgId=C0A8031AE91718B4AAC27A6369F603E6, offsetMsgId=C0A8031A00002A9F000000000002BD4A, messageQueue=MessageQueue [topic=TopicTest, brokerName=broker-a, queueId=3], queueOffset=249]
SendResult [sendStatus=SEND_OK, msgId=C0A8031AE91718B4AAC27A6369F703E7, offsetMsgId=C0A8031A00002A9F000000000002BDFE, messageQueue=MessageQueue [topic=TopicTest, brokerName=broker-a, queueId=0], queueOffset=249]
18:22:15.558 [NettyClientSelector_1] INFO RocketmqRemoting - closeChannel: close the connection to remote address[192.168.3.26:10911] result: true
18:22:15.559 [NettyClientSelector_1] INFO RocketmqRemoting - closeChannel: close the connection to remote address[127.0.0.1:9876] result: true
18:22:15.560 [NettyClientSelector_1] INFO RocketmqRemoting - closeChannel: close the connection to remote address[192.168.3.26:10909] result: true
没有最后。
6. 启动 RocketMQ Consumer
打开 org.apache.rocketmq.example.quickstart.Consumer
示例类,代码如下:
// Consumer.java
public class Consumer {
public static void main(String[] args) throws InterruptedException, MQClientException {
/*
* Instantiate with specified consumer group name.
*/
DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("please_rename_unique_group_name_4");
/*
* Specify name server addresses.
* <p/>
*
* Alternatively, you may specify name server addresses via exporting environmental variable: NAMESRV_ADDR
* <pre>
* {@code
* consumer.setNamesrvAddr("name-server1-ip:9876;name-server2-ip:9876");
* }
* </pre>
*/
/*
* Specify where to start in case the specified consumer group is a brand new one.
*/
consumer.setNamesrvAddr("127.0.0.1:9876"); // <x> 哈哈哈哈
consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
/*
* Subscribe one more more topics to consume.
*/
consumer.subscribe("TopicTest", "*");
/*
* Register callback to execute on arrival of messages fetched from brokers.
*/
consumer.registerMessageListener(new MessageListenerConcurrently() {
public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs,
ConsumeConcurrentlyContext context) {
System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), msgs);
return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
}
});
/*
* Launch the consumer instance.
*/
consumer.start();
System.out.printf("Consumer Started.%n");
}
}
注意,在 哈哈哈哈处,我们还增加了
consumer.setNamesrvAddr("127.0.0.1:9876")
代码块,指明 Consumer 使用的 RocketMQ Namesrv 。😈 再来一道送命题,为什么指定的不是 RocketMQ Broker 呢?
然后,右键运行,RocketMQ Consumer 就启动完成。输入日志如下:
18:37:12.196 [main] DEBUG i.n.u.i.l.InternalLoggerFactory - Using SLF4J as the default logging framework
Consumer Started.
ConsumeMessageThread_2 Receive New Messages: [MessageExt [queueId=3, storeSize=178, queueOffset=0, sysFlag=0, bornTimestamp=1543054934061, bornHost=/192.168.3.26:64103, storeTimestamp=1543054934065, storeHost=/192.168.3.26:10911, msgId=C0A8031A00002A9F0000000000000164, commitLogOffset=356, bodyCRC=1250039395, reconsumeTimes=0, preparedTransactionOffset=0, toString()=Message{topic='TopicTest', flag=0, properties={MIN_OFFSET=0, MAX_OFFSET=250, CONSUME_START_TIME=1543055832771, UNIQ_KEY=C0A8031AE91718B4AAC27A63642D0002, WAIT=true, TAGS=TagA}, body=[72, 101, 108, 108, 111, 32, 82, 111, 99, 107, 101, 116, 77, 81, 32, 50], transactionId='null'}]]
ConsumeMessageThread_16 Receive New Messages: [MessageExt [queueId=2, storeSize=179, queueOffset=4, sysFlag=0, bornTimestamp=1543054934102, bornHost=/192.168.3.26:64103, storeTimestamp=1543054934103, storeHost=/192.168.3.26:10911, msgId=C0A8031A00002A9F0000000000000BD9, commitLogOffset=3033, bodyCRC=367242165, reconsumeTimes=0, preparedTransactionOffset=0, toString()=Message{topic='TopicTest', flag=0, properties={MIN_OFFSET=0, MAX_OFFSET=250, CONSUME_START_TIME=1543055832779, UNIQ_KEY=C0A8031AE91718B4AAC27A6364560011, WAIT=true, TAGS=TagA}, body=[72, 101, 108, 108, 111, 32, 82, 111, 99, 107, 101, 116, 77, 81, 32, 49, 55], transactionId='null'}]]
// ... 中间省略 N 条 ...
CONSUME_START_TIME=1543055832779, UNIQ_KEY=C0A8031AE91718B4AAC27A636450000F, WAIT=true, TAGS=TagA}, body=[72, 101, 108, 108, 111, 32, 82, 111, 99, 107, 101, 116, 77, 81, 32, 49, 53], transactionId='null'}]]
没有最后。
666. 彩蛋
😈 一直想写这篇,一直忘记掉。
妥妥的,徐妈是最胖的。
还是那句话,一定一定一定要看 「0. 友情提示」 提供的文档。先懂原理,才能更好的读懂源码。
源码,是原理的具象化
原理,是代码的抽象化
欢迎加入我的知识星球,一起探讨架构,交流源码。加入方式,长按下方二维码噢:
已在知识星球更新源码解析如下:
如果你喜欢这篇文章,喜欢,转发。
生活很美好,明天见(。・ω・。)ノ♡