netty启动

public abstract class AbstractServerBootstrap implements ApplicationListener<ContextRefreshedEvent>, DisposableBean {public static EventLoopGroup workerGroup;private static Logger logger = LoggerFactory.getLogger(AbstractServerBootstrap.class);private static final String ZK_PREFIX = TopsConfReader.getConfContent("properties/crawler-autoissue.properties", "zk.prefix", TopsConfEnum.ConfScope.R);@Overridepublic void onApplicationEvent(ContextRefreshedEvent event) {if (isRootApplicationContext(event.getApplicationContext())){new Thread(){public void run(){// Configure the server.EventLoopGroup bossGroup = new NioEventLoopGroup(1);workerGroup = new NioEventLoopGroup();try {ServerBootstrap b = new ServerBootstrap();b.option(ChannelOption.SO_BACKLOG, 1024);b.option(ChannelOption.SO_KEEPALIVE, Boolean.TRUE);b.option(ChannelOption.TCP_NODELAY, Boolean.TRUE);b.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class).handler(new LoggingHandler(LogLevel.INFO)).childHandler(channelInitializer());Channel ch = b.bind(getBoundIP(), getListeningPort()).sync().channel();logger.info("启动netty server完成");registerRPC();ch.closeFuture().sync();} catch(Exception e){logger.error("启动netty server异常", e);throw new RuntimeException(e);}finally {bossGroup.shutdownGracefully();workerGroup.shutdownGracefully();}}}.start();}}/** * 注册netty rpc * @throws Exception */private void registerRPC() throws Exception{String rpcAddress = getBoundIP() + ":" + getListeningPort();String shardId = "0";String replicaId = RandomStringUtils.randomAlphanumeric(10);TopsZookeeperBalancer.registerRpc(rpcAddress, ZK_PREFIX, getIssueSite().name(), shardId, replicaId);}/** * 获取netty server 绑定的ip * @return */private String getBoundIP(){return TopsAppRegistry.getLocalIP();}private boolean isRootApplicationContext(ApplicationContext context) {return context.getParent() == null;}@Overridepublic void destroy() throws Exception {}protected ChannelInitializer<SocketChannel> channelInitializer(){return new ChannelInitializer<SocketChannel>(){@Overridepublic void initChannel(SocketChannel ch) {channelPipeline(ch);}};}protected ChannelPipeline channelPipeline(Channel ch){ChannelPipeline p = ch.pipeline();p.addLast("httpCodec", new HttpServerCodec());p.addLast("aggegator", new HttpObjectAggregator(64 * 1024 * 1024));p.addLast("protocol", new NettyMethodInvokerServerCodec());return p;}protected int getListeningPort(){return 5566;}/** * 获取比价站点名称 * @return */protected abstract IssueSite getIssueSite();}

首先,我们可以知道,启动一个ApplicationListener, 通过监视ContextRefreshedEvent,只要发现Spring有文件内容更新,这启动.其中isRootApplicationContext,通过设置是不是第一次刷新.