public class NamesrvStartup {
public static Properties properties = null;
public static CommandLine commandLine = null;
public static void main(String[] args) {
main0(args);
}
public static NamesrvController main0(String[] args) {
System.setProperty(RemotingCommand.REMOTING_VERSION_KEY, Integer.toString(MQVersion.CURRENT_VERSION));
try {
//PackageConflictDetect.detectFastjson();
Options options = ServerUtil.buildCommandlineOptions(new Options());------------args是用java -jar 后面输入的字符串，按照键值对输入的，这一步是解析命令行的参数，c是指定config的配置文件，p看样子是退出？
commandLine = ServerUtil.parseCmdLine("mqnamesrv", args, buildCommandlineOptions(options), new PosixParser());
if (null == commandLine) {
System.exit(-1);
return null;
}
final NamesrvConfig namesrvConfig = new NamesrvConfig();
final NettyServerConfig nettyServerConfig = new NettyServerConfig();
nettyServerConfig.setListenPort(9876);
if (commandLine.hasOption('c')) {
String file = commandLine.getOptionValue('c');
if (file != null) {
InputStream in = new BufferedInputStream(new FileInputStream(file));
properties = new Properties();
properties.load(in);
MixAll.properties2Object(properties, namesrvConfig);
MixAll.properties2Object(properties, nettyServerConfig);
namesrvConfig.setConfigStorePath(file);
System.out.printf("load config properties file OK, " + file + "%n");
in.close();
}
}
if (commandLine.hasOption('p')) {
MixAll.printObjectProperties(null, namesrvConfig);
MixAll.printObjectProperties(null, nettyServerConfig);
System.exit(0);
}
MixAll.properties2Object(ServerUtil.commandLine2Properties(commandLine), namesrvConfig);
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);
}
LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
JoranConfigurator configurator = new JoranConfigurator();
configurator.setContext(lc);
lc.reset();
configurator.doConfigure(namesrvConfig.getRocketmqHome() + "/conf/logback_namesrv.xml");
final Logger log = LoggerFactory.getLogger(LoggerName.NAMESRV_LOGGER_NAME);
MixAll.printObjectProperties(log, namesrvConfig);
MixAll.printObjectProperties(log, nettyServerConfig);
----------------这个controller是关键类，传入两个配置文件进去
final NamesrvController controller = new NamesrvController(namesrvConfig, nettyServerConfig);
// remember all configs to prevent discard
controller.getConfiguration().registerConfig(properties);
--------------看下面的start方法，实际是调用controller中的一个叫remotingServer的参数的start方法，而remotingServer的赋值就是在这个initialize方法中，new一个NettyRemotingServer出来，是调用netty的入口（见下文）
boolean initResult = controller.initialize();
if (!initResult) {
controller.shutdown();
System.exit(-3);
}
Runtime.getRuntime().addShutdownHook(new ShutdownHookThread(log, new Callable<Void>() {
@Override
public Void call() throws Exception {
controller.shutdown();
return null;
}
}));
controller.start();
String tip = "The Name Server boot success. serializeType=" + RemotingCommand.getSerializeTypeConfigInThisServer();
log.info(tip);
System.out.printf(tip + "%n");
return controller;
} catch (Throwable e) {
e.printStackTrace();
System.exit(-1);
}
return null;
}
public static Options buildCommandlineOptions(final Options options) {
Option opt = new Option("c", "configFile", true, "Name server config properties file");
opt.setRequired(false);
options.addOption(opt);
opt = new Option("p", "printConfigItem", false, "Print all config item");
opt.setRequired(false);
options.addOption(opt);
return options;
}
}
sh ${ROCKETMQ_HOME}/bin/runserver.sh com.alibaba.rocketmq.namesrv.NamesrvStartup $@--------上面这行代码是bin目录下的mqnamesrv文件中的命令，执行NamesrvStartup 的Main方法，启动nameServer，既然是用netty作为io框架来做服务端，必然有netty两个线程池的eventloop
@Override------------NettyRemotingServer的start方法，eventLoopGroupBoss是父线程池，管理端口监控连接的，eventLoopGroupSelector 是子线程池，select channel的读写，处理业务逻辑的
public void start() {
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());
}
});
ServerBootstrap childHandler =
this.serverBootstrap.group(this.eventLoopGroupBoss, this.eventLoopGroupSelector)
.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())
.localAddress(new InetSocketAddress(this.nettyServerConfig.getListenPort()))-----------根据之前分析netty可以知道，initchannel方法中添加的handler，每一个channel在accept生成的时候，都会把childHandler给添加到自己的pipeline当中去，当然initChannel方法中的handler也会添加进去，这几个handler一定有处理服务注册和服务发现相关逻辑的。
.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch) throws Exception {
ch.pipeline()
.addLast(defaultEventExecutorGroup, HANDSHAKE_HANDLER_NAME,
new HandshakeHandler(TlsSystemConfig.tlsMode))
.addLast(defaultEventExecutorGroup,//这里用的netty的第三个线程池，把channel的读写和在pipeline中的数据处理分开-----------------Encoder和Decoder的encode/decode方法之所以能使用，是被继承的适配器中的channelread/write调用了
new NettyEncoder(),
new NettyDecoder(),-----------------------检测心跳，长时间没有数据的连接关闭掉
new IdleStateHandler(0, 0, nettyServerConfig.getServerChannelMaxIdleTimeSeconds()),-----------------------------重写了register，active等方法
new NettyConnectManageHandler(),-----------------------------核心的数据处理类，明天再看
new NettyServerHandler()
);
}
});
if (nettyServerConfig.isServerPooledByteBufAllocatorEnable()) {
childHandler.childOption(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT);
}
try {
ChannelFuture sync = this.serverBootstrap.bind().sync();
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);
}
