这篇文章主要讲解了“zk中ClientCnxn的EventThread有什么作用”,文中的讲解内容简单清晰,易于学习与理解,下面请大家跟着小编的思路慢慢深入,一起来研究和学习“zk中ClientCnxn的EventThread有什么作用”吧!
EventThread 处理event 回调Callback(处理结果) packet
UML
将事件和相关监听列表加入到等待队列中 private void queueEvent(WatchedEvent event, Set<Watcher> materializedWatchers) { if (event.getType() == EventType.None && sessionState == event.getState()) { return; } sessionState = event.getState(); final Set<Watcher> watchers; if (materializedWatchers == null) { // materialize the watchers based on the event watchers = watcher.materialize(event.getState(), event.getType(), event.getPath()); } else { watchers = new HashSet<Watcher>(); watchers.addAll(materializedWatchers); } //设置watcherSetEventPair WatcherSetEventPair pair = new WatcherSetEventPair(watchers, event); // queue the pair (watch set & event) for later processing waitingEvents.add(pair); } 处理packet public void queuePacket(Packet packet) { if (wasKilled) { synchronized (waitingEvents) { if (isRunning) { waitingEvents.add(packet); } else { processEvent(packet); } } } else { waitingEvents.add(packet); } }
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