RocketMq4.7源码解析之二(name,broker启动流程)

Love The Way You Lie 2022-11-30 04:06 235阅读 0赞

### 文章目录 ###

*  broker启动流程
 *   *  NameServer启动流程
     *   *  mian
         *   *  createNamesrvController
             *   *  NamesrvController构造
         *  start
         *   *  initialize
             *  start

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# broker启动流程 #

broker配置了配置文件地址，以及环境变量配置文件所在目录  
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## NameServer启动流程 ##

### mian ###

public static NamesrvController main0(String[] args) {
        
    
            try {
        
                NamesrvController controller = createNamesrvController(args);
                start(controller);
                String tip = "The Name Server boot success. serializeType=" + RemotingCommand.getSerializeTypeConfigInThisServer();
                log.info(tip);
                System.out.printf("%s%n", tip);
                return controller;
            } catch (Throwable e) {
        
                e.printStackTrace();
                System.exit(-1);
            }
    
            return null;
        }

#### createNamesrvController ####

public static NamesrvController createNamesrvController(String[] args) throws IOException, JoranException {
        
            //设置版本号
            System.setProperty(RemotingCommand.REMOTING_VERSION_KEY, Integer.toString(MQVersion.CURRENT_VERSION));
            //PackageConflictDetect.detectFastjson();
    
            Options options = ServerUtil.buildCommandlineOptions(new Options());
            //解析命令行
            commandLine = ServerUtil.parseCmdLine("mqnamesrv", args, buildCommandlineOptions(options), new PosixParser());
            if (null == commandLine) {
        //命令行为null,则返回
                System.exit(-1);
                return null;
            }
    
            //names业务参数
            //初次加载时,从环境变量中获取ROCKETMQ_HOME并赋值
            final NamesrvConfig namesrvConfig = new NamesrvConfig();
            //网络参数
            final NettyServerConfig nettyServerConfig = new NettyServerConfig();
            //设置监听端口
            nettyServerConfig.setListenPort(9876);
            //解析-c configFile 通过，c 命令指定配置文件的路径。
            //使用“ 一属性名属性值”，例如一listenPort 9876 。
            if (commandLine.hasOption('c')) {
        
                String file = commandLine.getOptionValue('c');
                if (file != null) {
        
                    //读取配置文件
                    InputStream in = new BufferedInputStream(new FileInputStream(file));
                    properties = new Properties();
                    properties.load(in);
                    //解析配置文件属性
                    MixAll.properties2Object(properties, namesrvConfig);
                    MixAll.properties2Object(properties, nettyServerConfig);
    
                    //设置配置文件路径
                    namesrvConfig.setConfigStorePath(file);
    
                    System.out.printf("load config properties file OK, %s%n", file);
                    in.close();
                }
            }
    
            //-p 打印当前加载配置属性
            if (commandLine.hasOption('p')) {
        
                InternalLogger console = InternalLoggerFactory.getLogger(LoggerName.NAMESRV_CONSOLE_NAME);
                MixAll.printObjectProperties(console, namesrvConfig);
                MixAll.printObjectProperties(console, nettyServerConfig);
                System.exit(0);
            }
    
            //解析命令行属性填充到对象
            MixAll.properties2Object(ServerUtil.commandLine2Properties(commandLine), namesrvConfig);
    
                //ROCKETMQ_HOME环境变量非空判断
            if (null == namesrvConfig.getRocketmqHome()) {
        
                System.out.printf("Please set the %s variable in your environment to match the location of the RocketMQ installation%n", MixAll.ROCKETMQ_HOME_ENV);
                System.exit(-2);
            }
            //日志相关
            LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
            JoranConfigurator configurator = new JoranConfigurator();
            configurator.setContext(lc);
            lc.reset();
            configurator.doConfigure(namesrvConfig.getRocketmqHome() + "/conf/logback_namesrv.xml");
    
            log = InternalLoggerFactory.getLogger(LoggerName.NAMESRV_LOGGER_NAME);
    
            //log打印name和netty配置属性
            MixAll.printObjectProperties(log, namesrvConfig);
            MixAll.printObjectProperties(log, nettyServerConfig);
    
            final NamesrvController controller = new NamesrvController(namesrvConfig, nettyServerConfig);
    
            // remember all configs to prevent discard
            //使用配置文件属性,注册并覆盖默认属性
            controller.getConfiguration().registerConfig(properties);
    
            return controller;
        }

##### NamesrvController构造 #####

public NamesrvController(NamesrvConfig namesrvConfig, NettyServerConfig nettyServerConfig) {
        
            this.namesrvConfig = namesrvConfig;
            this.nettyServerConfig = nettyServerConfig;
            this.kvConfigManager = new KVConfigManager(this);
            //路由信息管理,内部有topic,broker,集群,以及心跳之类的信息
            this.routeInfoManager = new RouteInfoManager();
            this.brokerHousekeepingService = new BrokerHousekeepingService(this);
            //合并对象成员变量属性,并保存对象
            this.configuration = new Configuration(
                log,
                this.namesrvConfig, this.nettyServerConfig
            );
            this.configuration.setStorePathFromConfig(this.namesrvConfig, "configStorePath");
        }

public Configuration(InternalLogger log, Object... configObjects) {
        
            this.log = log;
            if (configObjects == null || configObjects.length == 0) {
        
                return;
            }
                //合并对象成员变量属性,并保存对象
            for (Object configObject : configObjects) {
        
                registerConfig(configObject);
            }
        }
        public Configuration registerConfig(Object configObject) {
        
            try {
        
                readWriteLock.writeLock().lockInterruptibly();
                try {
        
                    //对象成员变量值填充到prop
                    Properties registerProps = MixAll.object2Properties(configObject);
                    //属性覆盖allConfigs
                    merge(registerProps, this.allConfigs);
                    //记录对象
                    configObjectList.add(configObject);
                } finally {
        
                    readWriteLock.writeLock().unlock();
                }
            } catch (InterruptedException e) {
        
                log.error("registerConfig lock error");
            }
            return this;
        }

### start ###

public static NamesrvController start(final NamesrvController controller) throws Exception {
        
    
            if (null == controller) {
        
                throw new IllegalArgumentException("NamesrvController is null");
            }
            //初始化controller
            boolean initResult = controller.initialize();
            //初始化失败,退出
            if (!initResult) {
        
                controller.shutdown();
                System.exit(-3);
            }
            //注册JVM 钩子函数并启动服务器，
            //在JVM 进程关闭之前，先将线程池关闭，及时释放资源。 tomcat也有使用这种方法释放资源
            Runtime.getRuntime().addShutdownHook(new ShutdownHookThread(log, new Callable<Void>() {
        
                @Override
                public Void call() throws Exception {
        
                    controller.shutdown();
                    return null;
                }
            }));
    
            //启动
            controller.start();
    
            return controller;
        }

#### initialize ####

public boolean initialize() {
        
            //加载KV 配置
            this.kvConfigManager.load();
            //创建NettyServer 网络处理对象,创建线程池和信号量
            this.remotingServer = new NettyRemotingServer(this.nettyServerConfig, this.brokerHousekeepingService);
    
            //创建Netty业务线程池
            this.remotingExecutor =
                Executors.newFixedThreadPool(nettyServerConfig.getServerWorkerThreads(), new ThreadFactoryImpl("RemotingExecutorThread_"));
    
            this.registerProcessor();
            //NameServer 每隔10s扫描一次Broker ， 移除处于不激活状态的Broker
            this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
        
    
                @Override
                public void run() {
        
                    NamesrvController.this.routeInfoManager.scanNotActiveBroker();
                }
            }, 5, 10, TimeUnit.SECONDS);
            //NameServer每隔10 分钟打印一次KV 配置。
            this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
        
    
                @Override
                public void run() {
        
                    NamesrvController.this.kvConfigManager.printAllPeriodically();
                }
            }, 1, 10, TimeUnit.MINUTES);
    
            if (TlsSystemConfig.tlsMode != TlsMode.DISABLED) {
        
                // Register a listener to reload SslContext
                try {
        
                    fileWatchService = new FileWatchService(
                        new String[] {
        
                            TlsSystemConfig.tlsServerCertPath,
                            TlsSystemConfig.tlsServerKeyPath,
                            TlsSystemConfig.tlsServerTrustCertPath
                        },
                        new FileWatchService.Listener() {
        
                            boolean certChanged, keyChanged = false;
                            @Override
                            public void onChanged(String path) {
        
                                if (path.equals(TlsSystemConfig.tlsServerTrustCertPath)) {
        
                                    log.info("The trust certificate changed, reload the ssl context");
                                    reloadServerSslContext();
                                }
                                if (path.equals(TlsSystemConfig.tlsServerCertPath)) {
        
                                    certChanged = true;
                                }
                                if (path.equals(TlsSystemConfig.tlsServerKeyPath)) {
        
                                    keyChanged = true;
                                }
                                if (certChanged && keyChanged) {
        
                                    log.info("The certificate and private key changed, reload the ssl context");
                                    certChanged = keyChanged = false;
                                    reloadServerSslContext();
                                }
                            }
                            private void reloadServerSslContext() {
        
                                ((NettyRemotingServer) remotingServer).loadSslContext();
                            }
                        });
                } catch (Exception e) {
        
                    log.warn("FileWatchService created error, can't load the certificate dynamically");
                }
            }
    
            return true;
        }

#### start ####

public void start() {
        
            //Worker线程池
            this.defaultEventExecutorGroup = new DefaultEventExecutorGroup(
                nettyServerConfig.getServerWorkerThreads(),
                new ThreadFactory() {
        
    
                    private AtomicInteger threadIndex = new AtomicInteger(0);
    
                    @Override
                    public Thread newThread(Runnable r) {
        
                        return new Thread(r, "NettyServerCodecThread_" + this.threadIndex.incrementAndGet());
                    }
                });
    
            //初始化handler和编码器
            prepareSharableHandlers();
    
            ServerBootstrap childHandler =
                    //设置EventLoopGroup,来接受和处理新的连接,以进行事件的处理，如接受新连接以及读/写数据
                    //server socket接收了新建连接后，会把connection socket放到workerGroup中进行处理
                this.serverBootstrap.group(this.eventLoopGroupBoss, this.eventLoopGroupSelector)
                        //epoll还是nio channel
                    .channel(useEpoll() ? EpollServerSocketChannel.class : NioServerSocketChannel.class)
                    .option(ChannelOption.SO_BACKLOG, 1024)
                    .option(ChannelOption.SO_REUSEADDR, true)
                    .option(ChannelOption.SO_KEEPALIVE, false)
                    .childOption(ChannelOption.TCP_NODELAY, true)
                    .childOption(ChannelOption.SO_SNDBUF, nettyServerConfig.getServerSocketSndBufSize())
                    .childOption(ChannelOption.SO_RCVBUF, nettyServerConfig.getServerSocketRcvBufSize())
                        //使用指定的端口设置套接字地址
                    .localAddress(new InetSocketAddress(this.nettyServerConfig.getListenPort()))
                    .childHandler(new ChannelInitializer<SocketChannel>() {
        
                        @Override
                        public void initChannel(SocketChannel ch) throws Exception {
        
                            //分别添加2个handler,处理请求
                            ch.pipeline()
                                .addLast(defaultEventExecutorGroup, HANDSHAKE_HANDLER_NAME, handshakeHandler)
                                .addLast(defaultEventExecutorGroup,
                                        //设置编码器
                                    encoder,
                                        //设置解码器
                                    new NettyDecoder(),
                                        /*
                                        当连接空闲时间太长时，将会触发一个IdleStateEvent 事件.
                                        ChannelInboundHandler中重写userEvent-Triggered()方法来处理该IdleStateEvent 事件
                                         */
                                    new IdleStateHandler(0, 0, nettyServerConfig.getServerChannelMaxIdleTimeSeconds()),
                                    connectionManageHandler,
                                    serverHandler
                                );
                        }
                    });
    
            if (nettyServerConfig.isServerPooledByteBufAllocatorEnable()) {
        
                childHandler.childOption(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT);
            }
    
            try {
        
                //异步地绑定服务器；调用 sync()方法阻塞等待直到绑定完成
                ChannelFuture sync = this.serverBootstrap.bind().sync();
                //记录port
                InetSocketAddress addr = (InetSocketAddress) sync.channel().localAddress();
                this.port = addr.getPort();
            } catch (InterruptedException e1) {
        
                throw new RuntimeException("this.serverBootstrap.bind().sync() InterruptedException", e1);
            }
    
            if (this.channelEventListener != null) {
        
                this.nettyEventExecutor.start();
            }
    
            this.timer.scheduleAtFixedRate(new TimerTask() {
        
    
                @Override
                public void run() {
        
                    try {
        
                        NettyRemotingServer.this.scanResponseTable();
                    } catch (Throwable e) {
        
                        log.error("scanResponseTable exception", e);
                    }
                }
            }, 1000 * 3, 1000);
        }

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