RocketMQ存储--主从同步【源码笔记】

一、问题思考
二、Broker启动HA调用链
1.HA初始化调用链
2.启动调用链
三、线程类职责
1.AcceptSocketService职责
2.HAConnection职责
2.1 writeSocketService职责
2.2 readSocketService职责
3.GroupTransferService职责
4.HAClient职责
四、消息写入与线程类交互
五、主从同步示意图
1.主从同步交互消息格式
2.主从同步示意图
六、源代码清单

@1 BrokerStartup#main
start(createBrokerController(args));
@2 BrokerStartup#createBrokerController
boolean initResult = controller.initialize();
@3 BrokerController#initialize
this.messageStore = new DefaultMessageStore
@4 DefaultMessageStore#DefaultMessageStore()
this.haService = new HAService(this);
this.defaultMessageStore = defaultMessageStore;
this.acceptSocketService =
new AcceptSocketService(defaultMessageStore.getMessageStoreConfig()
.getHaListenPort());
this.groupTransferService = new GroupTransferService();
this.haClient = new HAClient();

@1 BrokerStartup#start
controller.start();
@2 BrokerController#start
this.messageStore.start();
@3 DefaultMessageStore#start
@4 this.haService.start();
this.acceptSocketService.beginAccept();
this.acceptSocketService.start();
this.groupTransferService.start();
this.haClient.start();

//构造方法
public HAConnection(final HAService haService, final SocketChannel socketChannel) throws IOException {
this.haService = haService;
this.socketChannel = socketChannel;
//获取客户端请求地址
this.clientAddr = this.socketChannel.socket().getRemoteSocketAddress().toString();
//将通道调整为非阻塞
this.socketChannel.configureBlocking(false);
//关闭连接前将数据发送完毕
this.socketChannel.socket().setSoLinger(false, -1);
//将Nagle算法关闭，客户端每发送一次数据无论大小，都会将其发送出去
this.socketChannel.socket().setTcpNoDelay(true);
//设置接受缓存区为64K
this.socketChannel.socket().setReceiveBufferSize(1024 * 64);
//设置发包缓存区为64K
this.socketChannel.socket().setSendBufferSize(1024 * 64);
//写数据线程类
this.writeSocketService = new WriteSocketService(this.socketChannel);
//读数据线程类
this.readSocketService = new ReadSocketService(this.socketChannel);
this.haService.getConnectionCount().incrementAndGet();
}
//启动
public void start() {
//启动读数据线程
this.readSocketService.start();
//启动写数据线程
this.writeSocketService.start();
}