1,rocketmq namesrv 第一章启动过程
2015-04-10 15:11
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大家好，很高兴在这里跟大家分享下rocketmq源码实现，如有不对的地方欢迎指正。
Namesrv顾名思义就是名称服务，是没有状态可横向扩展的服务。废话不多说了，直接贴代码。。
1,入口函数NamesrvStartup.main0
1.1 System.setProperty(RemotingCommand.RemotingVersionKey, Integer.toString(MQVersion.CurrentVersion));
设置版本号属性
1.2 if (null == System.getProperty(NettySystemConfig.SystemPropertySocketSndbufSize)) {
NettySystemConfig.SocketSndbufSize = 2048;
}
如果缓冲区为空 默认为2M
1.3 if (null == System.getProperty(NettySystemConfig.SystemPropertySocketRcvbufSize)) {
NettySystemConfig.SocketRcvbufSize = 1024;
}
如果接受缓冲区为空 默认为1M
1.4 PackageConflictDetect.detectFastjson();
检测包冲突,因为rocketmq 配置都是用的fastJson作为序列化工具,所以最低使用的是1.2.3版本,如果版本过低会抛出异常
1.5 Options options = ServerUtil.buildCommandlineOptions(new Options());
commandLine =
ServerUtil.parseCmdLine("mqnamesrv", args, buildCommandlineOptions(options),
new PosixParser());
if (null == commandLine) {
System.exit(-1);
return null;
}
解析命令行参数,为用户提供了一个解释命令行的API不懂的可以查查 http://blog.csdn.net/faye0412/article/details/2949753
1.6 final NamesrvConfig namesrvConfig = new NamesrvConfig();
初始化Namesrv 全局配置文件
private String rocketmqHome = System.getProperty(MixAll.ROCKETMQ_HOME_PROPERTY,
System.getenv(MixAll.ROCKETMQ_HOME_ENV));
rocketmq home路径
private String kvConfigPath = System.getProperty("user.home") + File.separator + "namesrv"
+ File.separator + "kvConfig.json";
KV配置持久化地址,具体含义讲到了在给大家说
1.7 final NettyServerConfig nettyServerConfig = new NettyServerConfig();
nettyServerConfig.setListenPort(9876); 设置namesrv监听端口
Namesrv Netty服务全局配置,大家都知道rocketmq 底层通信使用的Netty4,下面给出各个参数的意义
private int listenPort = 8888;默认 监听端口
private int serverWorkerThreads = 8;Netty服务工作线程数量
private int serverCallbackExecutorThreads = 0;Netty服务异步回调线程池线程数量
private int serverSelectorThreads = 3;Netty Selector线程数量
private int serverOnewaySemaphoreValue = 256;控制单向的信号量
private int serverAsyncSemaphoreValue = 64;控制异步信号量
private int serverChannelMaxIdleTimeSeconds = 120;服务空闲心跳检测时间间隔 单位秒
private int serverSocketSndBufSize = NettySystemConfig.SocketSndbufSize;Netty发送缓冲区大小
private int serverSocketRcvBufSize = NettySystemConfig.SocketRcvbufSize;Netty接受缓冲区大小
private boolean serverPooledByteBufAllocatorEnable = false;是否使用Netty内存池
1.8 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);
System.out.println("load config properties file OK, " + file);
in.close();
}
}
根据命令行参数,加载外部namesrvConfig及nettyServerConfig全局配置文件
1.9 if (commandLine.hasOption('p')) {
MixAll.printObjectProperties(null, namesrvConfig);
MixAll.printObjectProperties(null, nettyServerConfig);
System.exit(0);
}
打印namesrvConfig及nettyServerConfig配置信息
2.0 MixAll.properties2Object(ServerUtil.commandLine2Properties(commandLine), namesrvConfig);
将命令行指定的propertis文件 解析加载到namesrvConfig配置中
if (null == namesrvConfig.getRocketmqHome()) {
System.out.println("Please set the " + MixAll.ROCKETMQ_HOME_ENV
+ " variable in your environment to match the location of the RocketMQ installation");
System.exit(-2);
}
注意：这里必须要设置rocketMq home路径,因为要加载conf配置文件
2.1 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.NamesrvLoggerName);
初始化logback日志工厂,rocketMq默认使用logback作为日志输出,不知道的可以去查查
2.2 MixAll.printObjectProperties(log, namesrvConfig);
MixAll.printObjectProperties(log, nettyServerConfig);
打印namesrv配置参数
2.3 final NamesrvController controller = new NamesrvController(namesrvConfig, nettyServerConfig);
创建NamesrvController对象,namesrv 主要控制类
4000
this.namesrvConfig = namesrvConfig;设置namesrc配置
this.nettyServerConfig = nettyServerConfig;设置Netty配置
this.kvConfigManager = new KVConfigManager(this);创建KV配置管理 具体用到在解释
this.routeInfoManager = new RouteInfoManager();创建路由信息管理
this.brokerHousekeepingService = new BrokerHousekeepingService(this);创建broker连接事件处理服务
boolean initResult = controller.initialize();初始化分为几步
2.3.1 this.kvConfigManager.load();加载Kv配置文件
String content = MixAll.file2String(this.namesrvController.getNamesrvConfig().getKvConfigPath());
if (content != null) {
KVConfigSerializeWrapper kvConfigSerializeWrapper =
KVConfigSerializeWrapper.fromJson(content, KVConfigSerializeWrapper.class);
if (null != kvConfigSerializeWrapper) {
this.configTable.putAll(kvConfigSerializeWrapper.getConfigTable());
log.info("load KV config table OK");
}
}
rocketmq 默认使用json数据格式存储配置
默认路径为：System.getProperty("user.home") + File.separator + "namesrv" + File.separator + "kvConfig.json";
private final HashMap<String/* Namespace */, HashMap<String/* Key */, String/* Value */>> configTable = new HashMap<String, HashMap<String, String>>();
如果配置kvConfigSerializeWrapper不为空则放入configTable容器里,
2.3.2 this.remotingServer = new NettyRemotingServer(this.nettyServerConfig, this.brokerHousekeepingService);初始化通信层
super(nettyServerConfig.getServerOnewaySemaphoreValue(), nettyServerConfig.getServerAsyncSemaphoreValue());设置父类信号量
this.serverBootstrap = new ServerBootstrap();创建 netty 启动类
this.nettyServerConfig = nettyServerConfig;设置netty 配置信息
this.channelEventListener = channelEventListener;设置扩展的一个时间监听
int publicThreadNums = nettyServerConfig.getServerCallbackExecutorThreads();获取异步线程数量
if (publicThreadNums <= 0) {
publicThreadNums = 4; 如果小于等于0 默认设置为4
}
this.publicExecutor = Executors.newFixedThreadPool(publicThreadNums, new ThreadFactory() {
private AtomicInteger threadIndex = new AtomicInteger(0);
@Override
public Thread newThread(Runnable r) {
return new Thread(r, "NettyServerPublicExecutor_" + this.threadIndex.incrementAndGet());
}
});
创建 处理Callback应答线程池
this.eventLoopGroupBoss = new NioEventLoopGroup(1, new ThreadFactory() {
private AtomicInteger threadIndex = new AtomicInteger(0);
@Override
public Thread newThread(Runnable r) {
return new Thread(r,
String.format("NettyBossSelector_%d", this.threadIndex.incrementAndGet()));
}
});
创建netty eventLoopGroupBoss 默认线程为1
this.eventLoopGroupWorker =
new NioEventLoopGroup(nettyServerConfig.getServerSelectorThreads(), new ThreadFactory() {
private AtomicInteger threadIndex = new AtomicInteger(0);
private int threadTotal = nettyServerConfig.getServerSelectorThreads();
@Override
public Thread newThread(Runnable r) {
return new Thread(r, String.format("NettyServerSelector_%d_%d", threadTotal,
this.threadIndex.incrementAndGet()));
}
});
创建 netty eventLoopGroupWorker 默认线程为3
2.3.3 this.remotingExecutor =
Executors.newFixedThreadPool(nettyServerConfig.getServerWorkerThreads(),
new ThreadFactoryImpl("RemotingExecutorThread_"));
初始化服务端网络请求处理线程池
2.3.4 this.registerProcessor();
注册Name Server网络请求处理
2.3.5 this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
NamesrvController.this.routeInfoManager.scanNotActiveBroker();
}
}, 5, 10, TimeUnit.SECONDS);
NamesrvController初始化时启动线程定时调用RouteInfoManger的scanNotActiveBroker方法来定时清理不活动的broker（默认两分钟没有向namesrv发送心跳更新BrokerLiveInfo时间戳的），比较BrokerLiveInfo的时间戳，如果过期关闭channel连接
2.3.6 this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
NamesrvController.this.kvConfigManager.printAllPeriodically();
}
}, 1, 10, TimeUnit.MINUTES);
启动线程定时调用printAllPeriodically方法打印KV配置信息包含变化的配置
2.3.7 controller.start(); 调用NamesrvController.start()启动Netty及相关服务
2.3.8 this.defaultEventExecutorGroup = new DefaultEventExecutorGroup(//
nettyServerConfig.getServerWorkerThreads(), //
new ThreadFactory() {
private AtomicInteger threadIndex = new AtomicInteger(0);
@Override
public Thread newThread(Runnable r) {
return new Thread(r, "NettyServerWorkerThread_" + this.threadIndex.incrementAndGet());
}
});
创建默认的事件线程组,用于接收netty事件
2.3.9 ServerBootstrap childHandler = this.serverBootstrap.group(this.eventLoopGroupBoss, this.eventLoopGroupWorker)
.channel(NioServerSocketChannel.class)使用NIO selector
.option(ChannelOption.SO_BACKLOG, 1024)
输入连接指示（对连接的请求）的最大队列长度被设置为 backlog 参数。如果队列满时收到连接指示，则拒绝该连接
.option(ChannelOption.SO_REUSEADDR, true) 设置了SO_REUSADDR的应用可以避免TCP 的 TIME_WAIT 状态 时间过长无法复用端口
.option(ChannelOption.SO_KEEPALIVE, false) 设置心跳参数 FALSE为不启用参数
.childOption(ChannelOption.TCP_NODELAY, true)开启TCP_NODELAY表示package被忽略size尽快地发送。
.option(ChannelOption.SO_SNDBUF, nettyServerConfig.getServerSocketSndBufSize()) socket发送缓冲区大小
.option(ChannelOption.SO_RCVBUF, nettyServerConfig.getServerSocketRcvBufSize()) socket接收缓冲区大小
.localAddress(new InetSocketAddress(this.nettyServerConfig.getListenPort())) localAddress方法用于绑定服务器地址和端口
.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch) throws Exception {
ch.pipeline().addLast(
defaultEventExecutorGroup, 默认事件接收线程组
new NettyEncoder(), netty编码器
new NettyDecoder(), netty解码器
new IdleStateHandler(0, 0, nettyServerConfig .getServerChannelMaxIdleTimeSeconds()), 空闲链路状态处理
new NettyConnetManageHandler(), 自实现空闲链路处理
new NettyServerHandler()); netty服务处理
}
});
2.3.10 if (nettyServerConfig.isServerPooledByteBufAllocatorEnable()) {
childHandler.childOption(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT);
}
是否启用推外内存，默认不使用
2.3.11 ChannelFuture sync = this.serverBootstrap.bind().sync();
绑定netty监听端口
2.3.12 if (this.channelEventListener != null) {
this.nettyEventExecuter.start();
}
启动事件线程
2.3.13 this.timer.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
try {
NettyRemotingServer.this.scanResponseTable();
}
catch (Exception e) {
log.error("scanResponseTable exception", e);
}
}
}, 1000 * 3, 1000);
每隔1秒扫描下异步调用超时情况
Namesrv顾名思义就是名称服务，是没有状态可横向扩展的服务。废话不多说了，直接贴代码。。
1,入口函数NamesrvStartup.main0
1.1 System.setProperty(RemotingCommand.RemotingVersionKey, Integer.toString(MQVersion.CurrentVersion));
设置版本号属性
1.2 if (null == System.getProperty(NettySystemConfig.SystemPropertySocketSndbufSize)) {
NettySystemConfig.SocketSndbufSize = 2048;
}
如果缓冲区为空 默认为2M
1.3 if (null == System.getProperty(NettySystemConfig.SystemPropertySocketRcvbufSize)) {
NettySystemConfig.SocketRcvbufSize = 1024;
}
如果接受缓冲区为空 默认为1M
1.4 PackageConflictDetect.detectFastjson();
检测包冲突,因为rocketmq 配置都是用的fastJson作为序列化工具,所以最低使用的是1.2.3版本,如果版本过低会抛出异常
1.5 Options options = ServerUtil.buildCommandlineOptions(new Options());
commandLine =
ServerUtil.parseCmdLine("mqnamesrv", args, buildCommandlineOptions(options),
new PosixParser());
if (null == commandLine) {
System.exit(-1);
return null;
}
解析命令行参数,为用户提供了一个解释命令行的API不懂的可以查查 http://blog.csdn.net/faye0412/article/details/2949753
1.6 final NamesrvConfig namesrvConfig = new NamesrvConfig();
初始化Namesrv 全局配置文件
private String rocketmqHome = System.getProperty(MixAll.ROCKETMQ_HOME_PROPERTY,
System.getenv(MixAll.ROCKETMQ_HOME_ENV));
rocketmq home路径
private String kvConfigPath = System.getProperty("user.home") + File.separator + "namesrv"
+ File.separator + "kvConfig.json";
KV配置持久化地址,具体含义讲到了在给大家说
1.7 final NettyServerConfig nettyServerConfig = new NettyServerConfig();
nettyServerConfig.setListenPort(9876); 设置namesrv监听端口
Namesrv Netty服务全局配置,大家都知道rocketmq 底层通信使用的Netty4,下面给出各个参数的意义
private int listenPort = 8888;默认 监听端口
private int serverWorkerThreads = 8;Netty服务工作线程数量
private int serverCallbackExecutorThreads = 0;Netty服务异步回调线程池线程数量
private int serverSelectorThreads = 3;Netty Selector线程数量
private int serverOnewaySemaphoreValue = 256;控制单向的信号量
private int serverAsyncSemaphoreValue = 64;控制异步信号量
private int serverChannelMaxIdleTimeSeconds = 120;服务空闲心跳检测时间间隔 单位秒
private int serverSocketSndBufSize = NettySystemConfig.SocketSndbufSize;Netty发送缓冲区大小
private int serverSocketRcvBufSize = NettySystemConfig.SocketRcvbufSize;Netty接受缓冲区大小
private boolean serverPooledByteBufAllocatorEnable = false;是否使用Netty内存池
1.8 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);
System.out.println("load config properties file OK, " + file);
in.close();
}
}
根据命令行参数,加载外部namesrvConfig及nettyServerConfig全局配置文件
1.9 if (commandLine.hasOption('p')) {
MixAll.printObjectProperties(null, namesrvConfig);
MixAll.printObjectProperties(null, nettyServerConfig);
System.exit(0);
}
打印namesrvConfig及nettyServerConfig配置信息
2.0 MixAll.properties2Object(ServerUtil.commandLine2Properties(commandLine), namesrvConfig);
将命令行指定的propertis文件 解析加载到namesrvConfig配置中
if (null == namesrvConfig.getRocketmqHome()) {
System.out.println("Please set the " + MixAll.ROCKETMQ_HOME_ENV
+ " variable in your environment to match the location of the RocketMQ installation");
System.exit(-2);
}
注意：这里必须要设置rocketMq home路径,因为要加载conf配置文件
2.1 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.NamesrvLoggerName);
初始化logback日志工厂,rocketMq默认使用logback作为日志输出,不知道的可以去查查
2.2 MixAll.printObjectProperties(log, namesrvConfig);
MixAll.printObjectProperties(log, nettyServerConfig);
打印namesrv配置参数
2.3 final NamesrvController controller = new NamesrvController(namesrvConfig, nettyServerConfig);
创建NamesrvController对象,namesrv 主要控制类
4000
this.namesrvConfig = namesrvConfig;设置namesrc配置
this.nettyServerConfig = nettyServerConfig;设置Netty配置
this.kvConfigManager = new KVConfigManager(this);创建KV配置管理 具体用到在解释
this.routeInfoManager = new RouteInfoManager();创建路由信息管理
this.brokerHousekeepingService = new BrokerHousekeepingService(this);创建broker连接事件处理服务
boolean initResult = controller.initialize();初始化分为几步
2.3.1 this.kvConfigManager.load();加载Kv配置文件
String content = MixAll.file2String(this.namesrvController.getNamesrvConfig().getKvConfigPath());
if (content != null) {
KVConfigSerializeWrapper kvConfigSerializeWrapper =
KVConfigSerializeWrapper.fromJson(content, KVConfigSerializeWrapper.class);
if (null != kvConfigSerializeWrapper) {
this.configTable.putAll(kvConfigSerializeWrapper.getConfigTable());
log.info("load KV config table OK");
}
}
rocketmq 默认使用json数据格式存储配置
默认路径为：System.getProperty("user.home") + File.separator + "namesrv" + File.separator + "kvConfig.json";
private final HashMap<String/* Namespace */, HashMap<String/* Key */, String/* Value */>> configTable = new HashMap<String, HashMap<String, String>>();
如果配置kvConfigSerializeWrapper不为空则放入configTable容器里,
2.3.2 this.remotingServer = new NettyRemotingServer(this.nettyServerConfig, this.brokerHousekeepingService);初始化通信层
super(nettyServerConfig.getServerOnewaySemaphoreValue(), nettyServerConfig.getServerAsyncSemaphoreValue());设置父类信号量
this.serverBootstrap = new ServerBootstrap();创建 netty 启动类
this.nettyServerConfig = nettyServerConfig;设置netty 配置信息
this.channelEventListener = channelEventListener;设置扩展的一个时间监听
int publicThreadNums = nettyServerConfig.getServerCallbackExecutorThreads();获取异步线程数量
if (publicThreadNums <= 0) {
publicThreadNums = 4; 如果小于等于0 默认设置为4
}
this.publicExecutor = Executors.newFixedThreadPool(publicThreadNums, new ThreadFactory() {
private AtomicInteger threadIndex = new AtomicInteger(0);
@Override
public Thread newThread(Runnable r) {
return new Thread(r, "NettyServerPublicExecutor_" + this.threadIndex.incrementAndGet());
}
});
创建 处理Callback应答线程池
this.eventLoopGroupBoss = new NioEventLoopGroup(1, new ThreadFactory() {
private AtomicInteger threadIndex = new AtomicInteger(0);
@Override
public Thread newThread(Runnable r) {
return new Thread(r,
String.format("NettyBossSelector_%d", this.threadIndex.incrementAndGet()));
}
});
创建netty eventLoopGroupBoss 默认线程为1
this.eventLoopGroupWorker =
new NioEventLoopGroup(nettyServerConfig.getServerSelectorThreads(), new ThreadFactory() {
private AtomicInteger threadIndex = new AtomicInteger(0);
private int threadTotal = nettyServerConfig.getServerSelectorThreads();
@Override
public Thread newThread(Runnable r) {
return new Thread(r, String.format("NettyServerSelector_%d_%d", threadTotal,
this.threadIndex.incrementAndGet()));
}
});
创建 netty eventLoopGroupWorker 默认线程为3
2.3.3 this.remotingExecutor =
Executors.newFixedThreadPool(nettyServerConfig.getServerWorkerThreads(),
new ThreadFactoryImpl("RemotingExecutorThread_"));
初始化服务端网络请求处理线程池
2.3.4 this.registerProcessor();
注册Name Server网络请求处理
2.3.5 this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
NamesrvController.this.routeInfoManager.scanNotActiveBroker();
}
}, 5, 10, TimeUnit.SECONDS);
NamesrvController初始化时启动线程定时调用RouteInfoManger的scanNotActiveBroker方法来定时清理不活动的broker（默认两分钟没有向namesrv发送心跳更新BrokerLiveInfo时间戳的），比较BrokerLiveInfo的时间戳，如果过期关闭channel连接
2.3.6 this.scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
NamesrvController.this.kvConfigManager.printAllPeriodically();
}
}, 1, 10, TimeUnit.MINUTES);
启动线程定时调用printAllPeriodically方法打印KV配置信息包含变化的配置
2.3.7 controller.start(); 调用NamesrvController.start()启动Netty及相关服务
2.3.8 this.defaultEventExecutorGroup = new DefaultEventExecutorGroup(//
nettyServerConfig.getServerWorkerThreads(), //
new ThreadFactory() {
private AtomicInteger threadIndex = new AtomicInteger(0);
@Override
public Thread newThread(Runnable r) {
return new Thread(r, "NettyServerWorkerThread_" + this.threadIndex.incrementAndGet());
}
});
创建默认的事件线程组,用于接收netty事件
2.3.9 ServerBootstrap childHandler = this.serverBootstrap.group(this.eventLoopGroupBoss, this.eventLoopGroupWorker)
.channel(NioServerSocketChannel.class)使用NIO selector
.option(ChannelOption.SO_BACKLOG, 1024)
输入连接指示（对连接的请求）的最大队列长度被设置为 backlog 参数。如果队列满时收到连接指示，则拒绝该连接
.option(ChannelOption.SO_REUSEADDR, true) 设置了SO_REUSADDR的应用可以避免TCP 的 TIME_WAIT 状态 时间过长无法复用端口
.option(ChannelOption.SO_KEEPALIVE, false) 设置心跳参数 FALSE为不启用参数
.childOption(ChannelOption.TCP_NODELAY, true)开启TCP_NODELAY表示package被忽略size尽快地发送。
.option(ChannelOption.SO_SNDBUF, nettyServerConfig.getServerSocketSndBufSize()) socket发送缓冲区大小
.option(ChannelOption.SO_RCVBUF, nettyServerConfig.getServerSocketRcvBufSize()) socket接收缓冲区大小
.localAddress(new InetSocketAddress(this.nettyServerConfig.getListenPort())) localAddress方法用于绑定服务器地址和端口
.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch) throws Exception {
ch.pipeline().addLast(
defaultEventExecutorGroup, 默认事件接收线程组
new NettyEncoder(), netty编码器
new NettyDecoder(), netty解码器
new IdleStateHandler(0, 0, nettyServerConfig .getServerChannelMaxIdleTimeSeconds()), 空闲链路状态处理
new NettyConnetManageHandler(), 自实现空闲链路处理
new NettyServerHandler()); netty服务处理
}
});
2.3.10 if (nettyServerConfig.isServerPooledByteBufAllocatorEnable()) {
childHandler.childOption(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT);
}
是否启用推外内存，默认不使用
2.3.11 ChannelFuture sync = this.serverBootstrap.bind().sync();
绑定netty监听端口
2.3.12 if (this.channelEventListener != null) {
this.nettyEventExecuter.start();
}
启动事件线程
2.3.13 this.timer.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
try {
NettyRemotingServer.this.scanResponseTable();
}
catch (Exception e) {
log.error("scanResponseTable exception", e);
}
}
}, 1000 * 3, 1000);
每隔1秒扫描下异步调用超时情况
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