RocketMQ源码解析之NameServer启动流程（一）

1:入口

org.apache.rocketmq.namesrv.NamesrvStartup#main

org.apache.rocketmq.namesrv.NamesrvStartup#main0

2：创建nameserverController

org.apache.rocketmq.namesrv.NamesrvStartup#createNamesrvController

2.1：初始化NamesrvConfig参数

org.apache.rocketmq.common.namesrv.NamesrvConfig

2.2：初始化netty参数

org.apache.rocketmq.remoting.netty.NettyServerConfig

////将netty之前的的默认端口8888设置成 9876

nettyServerConfig.setListenPort(9876);

2.3：构造函数创建NamesrvController

org.apache.rocketmq.namesrv.NamesrvController

2.4：注册一些配置参数

controller.getConfiguration().registerConfig(properties);

3：运行NamesrvController

org.apache.rocketmq.namesrv.NamesrvStartup#start

3.1：校验一些参数（controller）

if (null == controller) { 
    throw new IllegalArgumentException("NamesrvController is null"); 
}

3.2：初始化controller

boolean initResult = controller.initialize();

3.2.1：继续初始化参数

public boolean initialize() {...............
 this.kvConfigManager.load(); 
 this.remotingServer = new NettyRemotingServer(this.nettyServerConfig, 
 this.brokerHousekeepingService);
    .......
}

3.2.1：定时任务

//扫描不活跃的broker--- 用于检测和Broker之间的心跳连接 
​
this.scheduledExecutorService.scheduleAtFixedRate(() -> NamesrvController.this.routeInfoManager.scanNotActiveBroker(), 5, 10, TimeUnit.SECONDS);
​
//打印信息 
this.scheduledExecutorService.scheduleAtFixedRate(() -> NamesrvController.this.kvConfigManager.printAllPeriodically(), 1, 10, TimeUnit.MINUTES);

4：注册钩子函数

Runtime.getRuntime().addShutdownHook(
​
new ShutdownHookThread(log, (Callable<Void>) () -> { 
​
controller.shutdown(); 
return null; 
            }
        )
    );