Tomcat NioEndPoint初探

startInternal():创建worker线程池,初始化Poller线程，根据可以用的处理器的数目，我的机器是双核超线程的，所以为4.

Poller是连接器的关键，不断地轮询分发连接，交给worker线程去处理。

 // Create worker collection
            if ( getExecutor() == null ) {
                createExecutor();//如在server.xml,没有配置executor,则创建默认的连接池，poolSize为200
            }

            initializeConnectionLatch();
            
            // Start poller threads
            pollers = new Poller[getPollerThreadCount()];
            for (int i=0; i<pollers.length; i++) {
                pollers[i] = new Poller();
                Thread pollerThread = new Thread(pollers[i], getName() + "-ClientPoller-"+i);
                pollerThread.setPriority(threadPriority);
                pollerThread.setDaemon(true);
                pollerThread.start();
            }

 在Poller的run方法内有如下代码：

 if ( !close ) {
                            if (wakeupCounter.get()>0) {
                                //if we are here, means we have other stuff to do
                                //do a non blocking select
                                keyCount = selector.selectNow();
                            }else {
                                keyCount = selector.keys().size();
                                wakeupCounter.set(-1);
                                keyCount = selector.select(selectorTimeout);//NIO关键，看注册的channel有没有事件发生
                            }
                            wakeupCounter.set(0);
                        }

 后面就是分发给相应worker进行处理，小记以后完善