简化版Netty源码
netty学习目录
一、Netty(一) NIO例子
二、Netty(二) netty服务端
三、Netty(三) Netty客户端+服务端
四、Netty(四) 简化版Netty源码
五、Netty(五)Netty5.x服务端
六、Netty(六) Netty Http 服务器例子
七、Netty(七) Netty服务端+客户端代码
八、Netty(八) Netty多客户端连接例子
九、Netty(九) Netty会话清除
十、Netty(十) Netty自定义编码器解码器
package com.zqw.nio.netty.n3.pool;
import java.nio.channels.ServerSocketChannel;
public interface Boss {
/**
* 加入一个新的ServerSocket
* @param serverChannel
*/
public void registerAcceptChannelTask(ServerSocketChannel serverChannel);
}
package com.zqw.nio.netty.n3.pool;
import com.zqw.nio.netty.n3.NioServerBoss;
import com.zqw.nio.netty.n3.NioServerWorker;
import java.util.concurrent.Executor;
import java.util.concurrent.atomic.AtomicInteger;
public class NioSelectorRunnablePool {
/**
* boss线程数组
*/
private final AtomicInteger bossIndex = new AtomicInteger();
private Boss[] bosses;
/**
* worker线程数组
*/
private final AtomicInteger workerIndex = new AtomicInteger();
private Worker[] workeres;
public NioSelectorRunnablePool(Executor boss, Executor worker) {
initBoss(boss, 1);
initWorker(worker, Runtime.getRuntime().availableProcessors() * 2);
}
/**
* 初始化boss线程
* @param boss
* @param count
*/
private void initBoss(Executor boss, int count) {
this.bosses = new NioServerBoss[count];
for (int i = 0; i < bosses.length; i++) {
bosses[i] = new NioServerBoss(boss, "boss thread " + (i+1), this);
}
}
/**
* 初始化worker线程
* @param worker
* @param count
*/
private void initWorker(Executor worker, int count) {
this.workeres = new NioServerWorker[count];
for (int i = 0; i < workeres.length; i++) {
workeres[i] = new NioServerWorker(worker, "worker thread " + (i+1), this);
}
}
/**
* 获取一个worker
* @return
*/
public Worker nextWorker() {
return workeres[Math.abs(workerIndex.getAndIncrement() % workeres.length)];
}
/**
* 获取一个boss
* @return
*/
public Boss nextBoss() {
return bosses[Math.abs(bossIndex.getAndIncrement() % bosses.length)];
}
}
package com.zqw.nio.netty.n3.pool;
import java.nio.channels.SocketChannel;
public interface Worker {
/**
* 加入一个新的客户端会话
* @param channel
*/
public void registerNewChannelTask(SocketChannel channel);
}
package com.zqw.nio.netty.n3;
import com.zqw.nio.netty.n3.pool.NioSelectorRunnablePool;
import java.io.IOException;
import java.nio.channels.Selector;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.Executor;
import java.util.concurrent.atomic.AtomicBoolean;
public abstract class AbstractNioSelector implements Runnable {
/**
* 线程池
*/
private final Executor executor;
/**
* 选择器
*/
protected Selector selector;
/**
* 选择器wakenUp状态标记
*/
protected final AtomicBoolean wakenUp = new AtomicBoolean();
/**
* 任务队列
*/
private final Queue<Runnable> taskQueue = new ConcurrentLinkedQueue<Runnable>();
/**
* 线程名称
*/
private String threadName;
/**
* 线程管理对象
*/
protected NioSelectorRunnablePool selectorRunnablePool;
AbstractNioSelector(Executor executor, String threadName, NioSelectorRunnablePool selectorRunnablePool) {
this.executor = executor;
this.threadName = threadName;
this.selectorRunnablePool = selectorRunnablePool;
openSelector();
}
/**
* 获取selector并启动线程
*/
private void openSelector() {
try {
this.selector = Selector.open();
} catch (IOException e) {
throw new RuntimeException("Failed to create a selector.");
}
executor.execute(this);
}
@Override
public void run() {
Thread.currentThread().setName(this.threadName);
while (true) {
try {
wakenUp.set(false);
select(selector);
processTaskQueue();
process(selector);
} catch (Exception e) {
// ignore
}
}
}
/**
* 注册一个任务并激活selector
*
* @param task
*/
protected final void registerTask(Runnable task) {
taskQueue.add(task);
Selector selector = this.selector;
if (selector != null) {
if (wakenUp.compareAndSet(false, true)) {
selector.wakeup();
}
} else {
taskQueue.remove(task);
}
}
/**
* 执行队列里的任务
*/
private void processTaskQueue() {
for (;;) {
final Runnable task = taskQueue.poll();
if (task == null) {
break;
}
task.run();
}
}
/**
* 获取线程管理对象
* @return
*/
public NioSelectorRunnablePool getSelectorRunnablePool() {
return selectorRunnablePool;
}
/**
* select抽象方法
*
* @param selector
* @return
* @throws IOException
*/
protected abstract int select(Selector selector) throws IOException;
/**
* selector的业务处理
*
* @param selector
* @throws IOException
*/
protected abstract void process(Selector selector) throws IOException;
}
package com.zqw.nio.netty.n3;
import java.io.IOException;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Set;
import java.util.concurrent.Executor;
import com.zqw.nio.netty.n3.pool.Boss;
import com.zqw.nio.netty.n3.pool.NioSelectorRunnablePool;
import com.zqw.nio.netty.n3.pool.Worker;
public class NioServerBoss extends AbstractNioSelector implements Boss {
public NioServerBoss(Executor executor, String threadName, NioSelectorRunnablePool selectorRunnablePool) {
super(executor, threadName, selectorRunnablePool);
}
@Override
protected void process(Selector selector) throws IOException {
Set<SelectionKey> selectedKeys = selector.selectedKeys();
if (selectedKeys.isEmpty()) {
return;
}
for (Iterator<SelectionKey> i = selectedKeys.iterator(); i.hasNext();) {
SelectionKey key = i.next();
i.remove();
ServerSocketChannel server = (ServerSocketChannel) key.channel();
// 新客户端
SocketChannel channel = server.accept();
// 设置为非阻塞
channel.configureBlocking(false);
// 获取一个worker
Worker nextworker = getSelectorRunnablePool().nextWorker();
// 注册新客户端接入任务
nextworker.registerNewChannelTask(channel);
System.out.println("新客户端链接");
}
}
public void registerAcceptChannelTask(final ServerSocketChannel serverChannel){
final Selector selector = this.selector;
registerTask(new Runnable() {
@Override
public void run() {
try {
//注册serverChannel到selector
serverChannel.register(selector, SelectionKey.OP_ACCEPT);
} catch (ClosedChannelException e) {
e.printStackTrace();
}
}
});
}
@Override
protected int select(Selector selector) throws IOException {
return selector.select();
}
}
package com.zqw.nio.netty.n3;
import com.zqw.nio.netty.n3.pool.NioSelectorRunnablePool;
import com.zqw.nio.netty.n3.pool.Worker;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Set;
import java.util.concurrent.Executor;
public class NioServerWorker extends AbstractNioSelector implements Worker {
public NioServerWorker(Executor executor, String threadName, NioSelectorRunnablePool selectorRunnablePool) {
super(executor, threadName, selectorRunnablePool);
}
@Override
protected void process(Selector selector) throws IOException {
Set<SelectionKey> selectedKeys = selector.selectedKeys();
if (selectedKeys.isEmpty()) {
return;
}
Iterator<SelectionKey> ite = this.selector.selectedKeys().iterator();
while (ite.hasNext()) {
SelectionKey key = (SelectionKey) ite.next();
// 移除，防止重复处理
ite.remove();
// 得到事件发生的Socket通道
SocketChannel channel = (SocketChannel) key.channel();
// 数据总长度
int ret = 0;
boolean failure = true;
ByteBuffer buffer = ByteBuffer.allocate(1024);
//读取数据
try {
ret = channel.read(buffer);
failure = false;
} catch (Exception e) {
// ignore
}
//判断是否连接已断开
if (ret <= 0 || failure) {
key.cancel();
System.out.println("客户端断开连接");
}else{
System.out.println("收到数据:" + new String(buffer.array()));
//回写数据
ByteBuffer outBuffer = ByteBuffer.wrap("收到\n".getBytes());
channel.write(outBuffer);// 将消息回送给客户端
}
}
}
/**
* 加入一个新的socket客户端
*/
public void registerNewChannelTask(final SocketChannel channel){
final Selector selector = this.selector;
registerTask(new Runnable() {
@Override
public void run() {
try {
//将客户端注册到selector中
channel.register(selector, SelectionKey.OP_READ);
} catch (ClosedChannelException e) {
e.printStackTrace();
}
}
});
}
@Override
protected int select(Selector selector) throws IOException {
return selector.select(500);
}
}
package com.zqw.nio.netty.n3;
import com.zqw.nio.netty.n3.pool.Boss;
import com.zqw.nio.netty.n3.pool.NioSelectorRunnablePool;
import java.net.SocketAddress;
import java.nio.channels.ServerSocketChannel;
public class ServerBootstrap {
private NioSelectorRunnablePool selectorRunnablePool;
public ServerBootstrap(NioSelectorRunnablePool selectorRunnablePool) {
this.selectorRunnablePool = selectorRunnablePool;
}
/**
* 绑定端口
* @param localAddress
*/
public void bind(final SocketAddress localAddress){
try {
// 获得一个ServerSocket通道
ServerSocketChannel serverChannel = ServerSocketChannel.open();
// 设置通道为非阻塞
serverChannel.configureBlocking(false);
// 将该通道对应的ServerSocket绑定到port端口
serverChannel.socket().bind(localAddress);
//获取一个boss线程
Boss nextBoss = selectorRunnablePool.nextBoss();
//向boss注册一个ServerSocket通道
nextBoss.registerAcceptChannelTask(serverChannel);
} catch (Exception e) {
e.printStackTrace();
}
}
}
package com.zqw.nio.netty.n3;
import com.zqw.nio.netty.n3.pool.NioSelectorRunnablePool;
import java.net.InetSocketAddress;
import java.util.concurrent.Executors;
public class Start {
public static void main(String[] args) {
//初始化线程
NioSelectorRunnablePool nioSelectorRunnablePool = new NioSelectorRunnablePool(Executors.newCachedThreadPool(), Executors.newCachedThreadPool());
//获取服务类
ServerBootstrap bootstrap = new ServerBootstrap(nioSelectorRunnablePool);
//绑定端口
bootstrap.bind(new InetSocketAddress(10101));
System.out.println("start");
}
}