Broker启动流程源码分析

引言

broker是接收存储生产者的消息，提供给消费者。

启动流程

Broker的启动流程主要是两个类。BrokerController和BrokerStartup。
BrokerStartup是管理BrokerController的生命周期。

//启动的入口
public static void main(String[] args) {
        start(createBrokerController(args));
    }
//创建brokerController
//主要是初始化 brokerConfig,nettyServerConfig,nettyClientConfig,messageStoreConfig 四份配置
//调用BrokerController.initialize方法
//注册Runtime的shotdownHook。jvm关闭时，调用BrokerController的shutdown
public static BrokerController createBrokerController(String[] args) {
        System.setProperty(RemotingCommand.REMOTING_VERSION_KEY, Integer.toString(MQVersion.CURRENT_VERSION));

        if (null == System.getProperty(NettySystemConfig.COM_ROCKETMQ_REMOTING_SOCKET_SNDBUF_SIZE)) {
            NettySystemConfig.socketSndbufSize = 131072;
        }

        if (null == System.getProperty(NettySystemConfig.COM_ROCKETMQ_REMOTING_SOCKET_RCVBUF_SIZE)) {
            NettySystemConfig.socketRcvbufSize = 131072;
        }

        try {
            //PackageConflictDetect.detectFastjson();
            Options options = ServerUtil.buildCommandlineOptions(new Options());
            commandLine = ServerUtil.parseCmdLine("mqbroker", args, buildCommandlineOptions(options),
                new PosixParser());
            if (null == commandLine) {
                System.exit(-1);
            }

            final BrokerConfig brokerConfig = new BrokerConfig();
            final NettyServerConfig nettyServerConfig = new NettyServerConfig();
            final NettyClientConfig nettyClientConfig = new NettyClientConfig();

            nettyClientConfig.setUseTLS(Boolean.parseBoolean(System.getProperty(TLS_ENABLE,
                String.valueOf(TlsSystemConfig.tlsMode == TlsMode.ENFORCING))));
            nettyServerConfig.setListenPort(10911);
            final MessageStoreConfig messageStoreConfig = new MessageStoreConfig();

            if (BrokerRole.SLAVE == messageStoreConfig.getBrokerRole()) {
                int ratio = messageStoreConfig.getAccessMessageInMemoryMaxRatio() - 10;
                messageStoreConfig.setAccessMessageInMemoryMaxRatio(ratio);
            }

            if (commandLine.hasOption('c')) {
                String file = commandLine.getOptionValue('c');
                if (file != null) {
                    configFile = file;
                    InputStream in = new BufferedInputStream(new FileInputStream(file));
                    properties = new Properties();
                    properties.load(in);

                    properties2SystemEnv(properties);
                    MixAll.properties2Object(properties, brokerConfig);
                    MixAll.properties2Object(properties, nettyServerConfig);
                    MixAll.properties2Object(properties, nettyClientConfig);
                    MixAll.properties2Object(properties, messageStoreConfig);

                    BrokerPathConfigHelper.setBrokerConfigPath(file);
                    in.close();
                }
            }

            MixAll.properties2Object(ServerUtil.commandLine2Properties(commandLine), brokerConfig);

            if (null == brokerConfig.getRocketmqHome()) {
                System.out.printf("Please set the %s variable in your environment to match the location of the RocketMQ installation", MixAll.ROCKETMQ_HOME_ENV);
                System.exit(-2);
            }

            String namesrvAddr = brokerConfig.getNamesrvAddr();
            if (null != namesrvAddr) {
                try {
                    String[] addrArray = namesrvAddr.split(";");
                    for (String addr : addrArray) {
                        RemotingUtil.string2SocketAddress(addr);
                    }
                } catch (Exception e) {
                    System.out.printf(
                        "The Name Server Address[%s] illegal, please set it as follows, \"127.0.0.1:9876;192.168.0.1:9876\"%n",
                        namesrvAddr);
                    System.exit(-3);
                }
            }

            switch (messageStoreConfig.getBrokerRole()) {
                case ASYNC_MASTER:
                case SYNC_MASTER:
                    brokerConfig.setBrokerId(MixAll.MASTER_ID);
                    break;
                case SLAVE:
                    if (brokerConfig.getBrokerId() <= 0) {
                        System.out.printf("Slave's brokerId must be > 0");
                        System.exit(-3);
                    }

                    break;
                default:
                    break;
            }

            if (messageStoreConfig.isEnableDLegerCommitLog()) {
                brokerConfig.setBrokerId(-1);
            }

            messageStoreConfig.setHaListenPort(nettyServerConfig.getListenPort() + 1);
            LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
            JoranConfigurator configurator = new JoranConfigurator();
            configurator.setContext(lc);
            lc.reset();
            configurator.doConfigure(brokerConfig.getRocketmqHome() + "/conf/logback_broker.xml");

            if (commandLine.hasOption('p')) {
                InternalLogger console = InternalLoggerFactory.getLogger(LoggerName.BROKER_CONSOLE_NAME);
                MixAll.printObjectProperties(console, brokerConfig);
                MixAll.printObjectProperties(console, nettyServerConfig);
                MixAll.printObjectProperties(console, nettyClientConfig);
                MixAll.printObjectProperties(console, messageStoreConfig);
                System.exit(0);
            } else if (commandLine.hasOption('m')) {
                InternalLogger console = InternalLoggerFactory.getLogger(LoggerName.BROKER_CONSOLE_NAME);
                MixAll.printObjectProperties(console, brokerConfig, true);
                MixAll.printObjectProperties(console, nettyServerConfig, true);
                MixAll.printObjectProperties(console, nettyClientConfig, true);
                MixAll.printObjectProperties(console, messageStoreConfig, true);
                System.exit(0);
            }

            log = InternalLoggerFactory.getLogger(LoggerName.BROKER_LOGGER_NAME);
            MixAll.printObjectProperties(log, brokerConfig);
            MixAll.printObjectProperties(log, nettyServerConfig);
            MixAll.printObjectProperties(log, nettyClientConfig);
            MixAll.printObjectProperties(log, messageStoreConfig);

            final BrokerController controller = new BrokerController(
                brokerConfig,
                nettyServerConfig,
                nettyClientConfig,
                messageStoreConfig);
            // remember all configs to prevent discard
            controller.getConfiguration().registerConfig(properties);

            boolean initResult = controller.initialize();
            if (!initResult) {
                controller.shutdown();
                System.exit(-3);
            }

            Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() {
                private volatile boolean hasShutdown = false;
                private AtomicInteger shutdownTimes = new AtomicInteger(0);

                @Override
                public void run() {
                    synchronized (this) {
                        log.info("Shutdown hook was invoked, {}", this.shutdownTimes.incrementAndGet());
                        if (!this.hasShutdown) {
                            this.hasShutdown = true;
                            long beginTime = System.currentTimeMillis();
                            controller.shutdown();
                            long consumingTimeTotal = System.currentTimeMillis() - beginTime;
                            log.info("Shutdown hook over, consuming total time(ms): {}", consumingTimeTotal);
                        }
                    }
                }
            }, "ShutdownHook"));

            return controller;
        } catch (Throwable e) {
            e.printStackTrace();
            System.exit(-1);
        }

        return null;
    }
// 调用BrokerController的start方法
public static BrokerController start(BrokerController controller) {
        try {

            controller.start();

            String tip = "The broker[" + controller.getBrokerConfig().getBrokerName() + ", "
                + controller.getBrokerAddr() + "] boot success. serializeType=" + RemotingCommand.getSerializeTypeConfigInThisServer();

            if (null != controller.getBrokerConfig().getNamesrvAddr()) {
                tip += " and name server is " + controller.getBrokerConfig().getNamesrvAddr();
            }

            log.info(tip);
            System.out.printf("%s%n", tip);
            return controller;
        } catch (Throwable e) {
            e.printStackTrace();
            System.exit(-1);
        }

        return null;
    }