netty（三）：NIO——多线程优化

NIO多线程优化

• 使用Boss线程来处理accepct事件
• 使用Worker线程来处理读写事件，可以创建多个worker线程

package com.review;import lombok.extern.slf4j.Slf4j;import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.channels.*;
import java.util.Iterator;
import java.util.concurrent.ConcurrentLinkedQueue;@Slf4j
public class MultiServer {public static void main(String[] args) throws IOException {Thread.currentThread().setName("BOSS");Selector selector = Selector.open();ServerSocketChannel ssc = ServerSocketChannel.open();ssc.configureBlocking(false);ssc.bind(new InetSocketAddress(11027));SelectionKey sscKey = ssc.register(selector, 0, null);sscKey.interestOps(SelectionKey.OP_ACCEPT);Worker worker = new Worker("worker-0");while (true){selector.select();Iterator<SelectionKey> iterator = selector.selectedKeys().iterator();while (iterator.hasNext()){SelectionKey key = iterator.next();iterator.remove();if (key.isAcceptable()){ServerSocketChannel serverSocketChannel = (ServerSocketChannel) key.channel();SocketChannel sc = serverSocketChannel.accept();sc.configureBlocking(false);worker.register(sc);worker.selector.wakeup();}}}}static class Worker implements Runnable{private String name;private Selector selector;private Thread thread;private volatile boolean start;ConcurrentLinkedQueue<Runnable> queue = new ConcurrentLinkedQueue<>();public Worker(String name){this.name = name;}public void register(SocketChannel sc) throws IOException {if (!start){selector = Selector.open();thread = new Thread(this,this.name);thread.start();start = true;}queue.add(()->{try {SelectionKey scKey = sc.register(selector, 0, null);scKey.interestOps(SelectionKey.OP_READ);} catch (ClosedChannelException e) {log.error(e.getMessage(),e);}});}@Overridepublic void run() {while (true){try {selector.select();} catch (IOException e) {log.error(e.getMessage(),e);}if (queue.size() > 0){queue.poll().run();}Iterator<SelectionKey> iterator = selector.selectedKeys().iterator();while (iterator.hasNext()){SelectionKey selectionKey = iterator.next();iterator.remove();if (selectionKey.isReadable()){SocketChannel channel = (SocketChannel) selectionKey.channel();}}}}}
}

————本专栏来自于对满叔在b站所讲的netty课程的理解