metaq的客户端自动断线重连机制

来源：互联网发布：python中的iteritems 编辑：程序博客网时间：2024/05/17 02:59

1.metaq的数据传输基于gecko

2.metaq的RemotingClientWrapper是gecko的RemotingClient的包装类，通过ConcurrentHashMap<String/* url */, Set<Object>/* references */>成员变量添加了连接的建立和关闭计数功能。

3.remoteclient的连接语句如下：

for (int i = 0; i < connCount; i++) {             try {                 final TimerRef timerRef = new TimerRef(((ClientConfig) this.config).getConnectTimeout(), null);                 final Future<NioSession> future =                         ((GeckoTCPConnectorController) this.controller).connect(remoteAddress, groupSet, remoteAddress,                             timerRef);                 final CheckConnectFutureRunner runnable =                         new CheckConnectFutureRunner(future, remoteAddress, groupSet, this);                 timerRef.setRunnable(runnable);                 this.insertTimer(timerRef);             }             catch (final Exception e) {                 log.error("连接" + RemotingUtils.getAddrString(remoteAddress) + "失败,启动重连任务", e);                 this.reconnectManager.addReconnectTask(new ReconnectTask(groupSet, remoteAddress));             }         }

在连接建立时，会新建一个定时任务，进行连接检测，连接的代码如下：

 @Override         public void run() {             try {                 if (!this.future.isDone() && this.future.get(10, TimeUnit.MILLISECONDS) == null) {                     final ReconnectManager reconnectManager = this.remotingClient.getReconnectManager();                     reconnectManager.addReconnectTask(new ReconnectTask(this.groupSet, this.remoteAddress));                 }             }             catch (final Exception e) {                 log.error("连接" + this.remoteAddress + "失败", e);             }         }

插入到TimerRefQueue对象中，reactor类实例使用访问者模式遍历queue对象，实现重连调用，代码如下：

  private void processMoveTimer() {         final long now = this.getTime();         // 距离上一次检测时间超过1秒         if (now - this.lastMoveTimestamp >= TIMEOUT_THRESOLD && !this.timerQueue.isEmpty()) {             this.lastMoveTimestamp = now;             this.timerQueue.iterateQueue(new TimerQueueVisitor(now));         }     }

如果需要重连，插入重连任务队列LinkedBlockingQueue<ReconnectTask>tasks，进行重连，代码如下：

 private void doReconnectTask(final ReconnectTask task) throws IOException, NotifyRemotingException {             log.info("Try to reconnect to " + RemotingUtils.getAddrString(task.getRemoteAddress()));             final TimerRef timerRef = new TimerRef(ReconnectManager.this.clientConfig.getConnectTimeout(), null);             try {                 final Future<NioSession> future =                         ReconnectManager.this.connector.connect(task.getRemoteAddress(), task.getGroupSet(),                             task.getRemoteAddress(), timerRef);                 final DefaultRemotingClient.CheckConnectFutureRunner runnable =                         new DefaultRemotingClient.CheckConnectFutureRunner(future, task.getRemoteAddress(),                             task.getGroupSet(), ReconnectManager.this.remotingClient);                 timerRef.setRunnable(runnable);                 ReconnectManager.this.remotingClient.insertTimer(timerRef);                 // 标记这个任务完成                 task.setDone(true);             }             catch (final Exception e) {                 this.readdTask(task);             }         }

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