Netty学习之旅------线程模型前置篇Reactor反应堆设计模式实现（基于java.nio）

时间：2022-09-09 15:02:38

1、Reactor反应堆设计模式

1.1、单线程模型

Netty学习之旅------线程模型前置篇Reactor反应堆设计模式实现（基于java.nio）

                          单线程模型Reactor(此图来源与网络)

下面以java nio为基础，实现Reactor模型。

Nio服务端代码：

package threadmode.r1;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
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;

/**
 * Nio服务器，
 * 本例主要用来增加对 Ractor 线程模型的理解，不会考虑半包等网络问题
 * 
 * 例子程序的功能：服务器接受客户端的请求数据，然后在后面再追加 (hello,服务器收到了你的信息。)
 * @author dingwei2
 * 
 * 
 * 
 * 
 *
 */
public class NioServer {

public static void main(String[] args) {
// TODO Auto-generated method stub

// 
(new Thread(new Reactor())).start();

}

/**
 * Reactor模型，反应堆
 * @author dingwei2
 *
 */
private static final class Reactor implements Runnable {

//private static final ConcurrentHashMap<SocketChannel, ByteBuffer> waitSendData 
//= new ConcurrentHashMap<SocketChannel, ByteBuffer>();

private static final byte[] b = "hello,服务器收到了你的信息。".getBytes();

public void run() {
// TODO Auto-generated method stub
System.out.println("服务端启动成功，等待客户端接入");
ServerSocketChannel ssc = null;
Selector selector = null;
try {
ssc = ServerSocketChannel.open();
ssc.configureBlocking(false);
ssc.bind(new InetSocketAddress("127.0.0.1", 9080));

selector = Selector.open();
ssc.register(selector, SelectionKey.OP_ACCEPT);

Set<SelectionKey> ops = null;
while(true) {
try {
selector.select(); //如果没有感兴趣的事件到达，阻塞等待
ops = selector.selectedKeys();
} catch(Throwable e) {
e.printStackTrace();
break;
}

//处理相关事件
for (Iterator<SelectionKey> it = ops.iterator(); it.hasNext();) {
SelectionKey key =  it.next();
it.remove();

try {
if(key.isAcceptable()) { //客户端建立连接
ServerSocketChannel serverSc = (ServerSocketChannel) key.channel();//这里其实，可以直接使用ssl这个变量
SocketChannel clientChannel = serverSc.accept();
clientChannel.configureBlocking(false);

//向选择器注册读事件，客户端向服务端发送数据准备好后，再处理
clientChannel.register(selector, SelectionKey.OP_READ);

System.out.println("收到客户端的连接请求。。。");
} else if (key.isWritable()) { //向客户端发送请求
SocketChannel clientChannel = (SocketChannel)key.channel();
ByteBuffer buf = (ByteBuffer)key.attachment();
buf.flip();
clientChannel.write(buf);
System.out.println("服务端向客户端发送数据。。。");
//重新注册读事件
clientChannel.register(selector, SelectionKey.OP_READ);
} else if(key.isReadable()) {  //处理客户端发送的数据
System.out.println("服务端接收客户端连接请求。。。");
//System.out.println(key);
SocketChannel clientChannel = (SocketChannel)key.channel();
//System.out.println("clientChannel.isConnected():" + clientChannel.isConnected());
//System.out.println("clientChannel.isConnectionPending():" +clientChannel.isConnectionPending());
//System.out.println("clientChannel.isOpen():" + clientChannel.isOpen());
//System.out.println("clientChannel.finishConnect():" + clientChannel.finishConnect());
ByteBuffer buf = ByteBuffer.allocate(1024);
System.out.println(buf.capacity());
clientChannel.read(buf);//
buf.put(b);
clientChannel.register(selector, SelectionKey.OP_WRITE, buf);//注册写事件
}
} catch(Throwable e) {
e.printStackTrace();
System.out.println("客户端主动断开连接。。。。。。。");
ssc.register(selector, SelectionKey.OP_ACCEPT);
}

}
}

} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

}

}

Nio客户端代码 

package threadmode.r1;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Set;
/**
 * @author dingwei2
 *
 */
public class NioClient {

public static void main(String[] args) {
// TODO Auto-generated method stub

SocketChannel clientClient;
Selector selector = null;
try {
clientClient = SocketChannel.open();
clientClient.configureBlocking(false);

selector = Selector.open();

clientClient.register(selector, SelectionKey.OP_CONNECT);

clientClient.connect(new InetSocketAddress("127.0.0.1",9080));

Set<SelectionKey> ops = null;

while(true) {
try {
selector.select();
ops = selector.selectedKeys();
for (Iterator<SelectionKey> it = ops.iterator(); it.hasNext();) {
SelectionKey key = it.next();
it.remove();
if(key.isConnectable()) {
System.out.println("client connect");
SocketChannel sc =  (SocketChannel) key.channel();
// 判断此通道上是否正在进行连接操作。
// 完成套接字通道的连接过程。
if (sc.isConnectionPending()) {
sc.finishConnect();
System.out.println("完成连接!");
ByteBuffer buffer = ByteBuffer.allocate(1024);
buffer.put("Hello,Server".getBytes());
buffer.flip();
sc.write(buffer);
}
sc.register(selector, SelectionKey.OP_READ); 
} else if(key.isWritable()) {
System.out.println("客户端写");
SocketChannel sc = (SocketChannel)key.channel();
ByteBuffer buffer = ByteBuffer.allocate(1024);
buffer.put("hello server.".getBytes());
buffer.flip();
sc.write(buffer);
} else if(key.isReadable()) {
System.out.println("客户端收到服务器的响应....");
SocketChannel sc = (SocketChannel)key.channel();
ByteBuffer buffer = ByteBuffer.allocate(1024);
int count = sc.read(buffer);
if(count > 0 ) {
buffer.flip();
byte[] response = new byte[buffer.remaining()];
buffer.get(response);
System.out.println(new String(response));
}

}

}

} catch(Throwable e) {
e.printStackTrace();
}

}






} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}


}

}


1.2 多线程模型

Netty学习之旅------线程模型前置篇Reactor反应堆设计模式实现（基于java.nio）

Reactor多线程模型（多个Nio线程处理网络读写）(此图来源与网络)

1.2多线程模型，就是1个线程Acceptor接受客户端的连接，然后由一组IO线程（Reactor）来执行网络的读写。

下面贴出其实现

其中NioServer中的Acceptor为接受客户端连接线程。

其中NioReactorThreadGroup为一组IO线程，NioReactorThread为具体IO线程的实现。

package threadmode.r2;

import java.io.IOException;
import java.net.InetSocketAddress;
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;

public class NioServer {

public static void main(String[] args) {
// TODO Auto-generated method stub

new Thread(new Acceptor()).start();

}

/**
 * 连接线程模型，反应堆，转发器 Acceptor
 * 
 * @author dingwei2
 *
 */
private static final class Acceptor implements Runnable {

private NioReactorThreadGroup nioReactorThreadGroup;

public Acceptor() {
nioReactorThreadGroup = new NioReactorThreadGroup();
}

public void run() {
// TODO Auto-generated method stub
System.out.println("服务端启动成功，等待客户端接入");
ServerSocketChannel ssc = null;
Selector selector = null;
try {
ssc = ServerSocketChannel.open();
ssc.configureBlocking(false);
ssc.bind(new InetSocketAddress("127.0.0.1", 9080));

selector = Selector.open();
ssc.register(selector, SelectionKey.OP_ACCEPT);

Set<SelectionKey> ops = null;
while (true) {
try {
selector.select(); // 如果没有感兴趣的事件到达，阻塞等待
ops = selector.selectedKeys();
} catch (Throwable e) {
e.printStackTrace();
break;
}

// 处理相关事件
for (Iterator<SelectionKey> it = ops.iterator(); it.hasNext();) {
SelectionKey key = it.next();
it.remove();

try {
if (key.isAcceptable()) { // 客户端建立连接
System.out.println("收到客户端的连接请求。。。");
ServerSocketChannel serverSc = (ServerSocketChannel) key.channel();// 这里其实，可以直接使用ssl这个变量
SocketChannel clientChannel = serverSc.accept();
clientChannel.configureBlocking(false);
nioReactorThreadGroup.dispatch(clientChannel); // 转发该请求
}
} catch (Throwable e) {
e.printStackTrace();
System.out.println("客户端主动断开连接。。。。。。。");
}

}
}

} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

}

}
package threadmode.r2;import java.nio.channels.SocketChannel;import java.util.concurrent.atomic.AtomicInteger;/** * nio 线程组;简易的NIO线程组 * @author dingwei2 * */public class NioReactorThreadGroup {private static final AtomicInteger requestCounter = new AtomicInteger();  //请求计数器private final int nioThreadCount;  // 线程池IO线程的数量private static final int DEFAULT_NIO_THREAD_COUNT; private NioReactorThread[] nioThreads;static {//DEFAULT_NIO_THREAD_COUNT = Runtime.getRuntime().availableProcessors() > 1//? 2 * (Runtime.getRuntime().availableProcessors() - 1 ) : 2;DEFAULT_NIO_THREAD_COUNT = 4;}public NioReactorThreadGroup() {this(DEFAULT_NIO_THREAD_COUNT);}public NioReactorThreadGroup(int threadCount) {if(threadCount < 1) {threadCount = DEFAULT_NIO_THREAD_COUNT;}this.nioThreadCount = threadCount;this.nioThreads = new NioReactorThread[threadCount];for(int i = 0; i < threadCount; i ++ ) {this.nioThreads[i] = new NioReactorThread();this.nioThreads[i].start(); //构造方法中启动线程，由于nioThreads不会对外暴露，故不会引起线程逃逸}System.out.println("Nio 线程数量：" + threadCount);}public void dispatch(SocketChannel socketChannel) {if(socketChannel != null ) {next().register(socketChannel);}}protected NioReactorThread next() {return this.nioThreads[ requestCounter.getAndIncrement() %  nioThreadCount ];}public static void main(String[] args) {// TODO Auto-generated method stub}}
package threadmode.r2;import java.io.IOException;import java.nio.ByteBuffer;import java.nio.channels.SelectionKey;import java.nio.channels.Selector;import java.nio.channels.SocketChannel;import java.util.ArrayList;import java.util.Iterator;import java.util.List;import java.util.Set;import java.util.concurrent.locks.ReentrantLock;/** * Nio 线程，专门负责nio read,write * 本类是实例行代码，不会对nio,断线重连，写半包等场景进行处理,旨在理解 Reactor模型（多线程版本） * @author dingwei2 * */public class NioReactorThread extends Thread {private static final byte[] b = "hello,服务器收到了你的信息。".getBytes(); //服务端给客户端的响应private Selector selector;private List<SocketChannel> waitRegisterList = new ArrayList<SocketChannel>(512);private ReentrantLock registerLock = new ReentrantLock();public NioReactorThread() {try {this.selector = Selector.open();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}/** * socket channel * @param socketChannel */public void register(SocketChannel socketChannel) {if(socketChannel != null ) {try {registerLock.lock();waitRegisterList.add(socketChannel);} finally {registerLock.unlock();}}}//private public void run() {while(true) {Set<SelectionKey> ops = null;try {selector.select(1000);ops = selector.selectedKeys();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();continue;}//处理相关事件for (Iterator<SelectionKey> it = ops.iterator(); it.hasNext();) {SelectionKey key =  it.next();it.remove();try {if (key.isWritable()) { //向客户端发送请求SocketChannel clientChannel = (SocketChannel)key.channel();ByteBuffer buf = (ByteBuffer)key.attachment();buf.flip();clientChannel.write(buf);System.out.println("服务端向客户端发送数据。。。");//重新注册读事件clientChannel.register(selector, SelectionKey.OP_READ);} else if(key.isReadable()) {  //接受客户端请求System.out.println("服务端接收客户端连接请求。。。");SocketChannel clientChannel = (SocketChannel)key.channel();ByteBuffer buf = ByteBuffer.allocate(1024);System.out.println(buf.capacity());clientChannel.read(buf);//buf.put(b);clientChannel.register(selector, SelectionKey.OP_WRITE, buf);//注册写事件}} catch(Throwable e) {e.printStackTrace();System.out.println("客户端主动断开连接。。。。。。。");}}//注册事件if(!waitRegisterList.isEmpty()) {try {registerLock.lock();for (Iterator<SocketChannel> it = waitRegisterList.iterator(); it.hasNext();) {SocketChannel sc = it.next();try {sc.register(selector, SelectionKey.OP_READ);} catch(Throwable e) {e.printStackTrace();//ignore}it.remove();}} finally {registerLock.unlock();}}}}}
NioClient与Reactor,单线程版本一样，在这不重复给出。


上述示例代码中，其实并不是完成按照Reacor设计模式而来的，重头戏请看1.3，主从多线程模型(Reacor)实现
1.3 主从多线程模型(Reactor)

Netty学习之旅------线程模型前置篇Reactor反应堆设计模式实现（基于java.nio）
主从多线程模型（此图来源与网络）

重点关注点如下：

Acceeptor,职责，维护java.nio.ServerSocketChannel类，绑定服务端监听端口，然后将该通道注册到MainRector中；

Main Reactor,监听客户端连接的反应堆，这里使用jdk并发中的Executors.newSingleThreadExecutor线程池来实现，监听客户端的连接事件(OP_ACCEPT)

Sub Reactor,目前没有使用jdk的并发池，这里用的SubReactorThreadGroup,其实现是数组，当然这里也可以使用jdk线程池，SubReactor的每一个线程都是IO线程，用来处理读，写事件。所有的IO线程公用一个业务线程池（基于juc）实现，用来处理业务逻辑，也就是运行Handel的地方。

Handel:具体业务逻辑实现，本例就是获取客户端的信息后，在请求信息后面追加一段文字，便返回给客户端。相关源码实现：

NioServer(Acceptor)的实现源码：

package persistent.prestige.demo.netty.threadmode.t3;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.channels.ServerSocketChannel;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;


/**
 * Reactor 主从Reactor模式实现
 * 
 * Acceptor,其实个人认为，这里就是服务端角色
 * @author Administrator
 *
 */
public class NioServer {

private static final int DEFAULT_PORT = 9080;

public static void main(String[] args) {

new Thread(new Acceptor()).start();

}


private static class Acceptor implements Runnable {

// main Reactor 线程池，用于处理客户端的连接请求
private static ExecutorService mainReactor = Executors.newSingleThreadExecutor();

public void run() {
// TODO Auto-generated method stub
ServerSocketChannel ssc = null;

try {
ssc = ServerSocketChannel.open();
ssc.configureBlocking(false);
ssc.bind(new InetSocketAddress(DEFAULT_PORT));

//转发到 MainReactor反应堆
dispatch(ssc);

System.out.println("服务端成功启动。。。。。。");

} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

private void dispatch(ServerSocketChannel ssc) {
mainReactor.submit(new MainReactor(ssc));
}

}


}
MainReactor 源码如下： 

package persistent.prestige.demo.netty.threadmode.t3;

import java.io.IOException;
import java.nio.channels.SelectableChannel;
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;


/**
 * 主Reactor,主要用来处理连接请求的反应堆
 * @author Administrator
 *
 */
public class MainReactor implements Runnable {

private Selector selector;
private SubReactorThreadGroup subReactorThreadGroup; 

public MainReactor(SelectableChannel channel) {
try {
selector = Selector.open();
channel.register(selector, SelectionKey.OP_ACCEPT);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

subReactorThreadGroup = new SubReactorThreadGroup(4);
}

public void run() {

System.out.println("MainReactor is running");
// TODO Auto-generated method stub
while (!Thread.interrupted()) {

Set<SelectionKey> ops = null;
try {
selector.select(1000);
ops = selector.selectedKeys();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

// 处理相关事件  
            for (Iterator<SelectionKey> it = ops.iterator(); it.hasNext();) {  
                SelectionKey key = it.next();  
                it.remove();  
                try {  
                    if (key.isAcceptable()) { // 客户端建立连接  
                        System.out.println("收到客户端的连接请求。。。");  
                        ServerSocketChannel serverSc = (ServerSocketChannel) key.channel();// 这里其实，可以直接使用ssl这个变量  
                        SocketChannel clientChannel = serverSc.accept();  
                        clientChannel.configureBlocking(false);  
                        subReactorThreadGroup.dispatch(clientChannel); // 转发该请求  
                    }  
                } catch (Throwable e) {  
                    e.printStackTrace();  
                    System.out.println("客户端主动断开连接。。。。。。。");  
                }  

            }  


}

}

}


SubReactor组，IO线程池实现： 

package persistent.prestige.demo.netty.threadmode.t3;

import java.nio.channels.SelectionKey;
import java.nio.channels.SocketChannel;  
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicInteger;  

/** 
 * nio 线程组;简易的NIO线程组 
 * @author dingwei2 
 * 
 */  
public class SubReactorThreadGroup {  

    private static final AtomicInteger requestCounter = new AtomicInteger();  //请求计数器  

    private final int nioThreadCount;  // 线程池IO线程的数量  
    private static final int DEFAULT_NIO_THREAD_COUNT;   
    private SubReactorThread[] nioThreads;  
    private ExecutorService businessExecutePool; //业务线程池

    static {  
//      DEFAULT_NIO_THREAD_COUNT = Runtime.getRuntime().availableProcessors() > 1  
//              ? 2 * (Runtime.getRuntime().availableProcessors() - 1 ) : 2;  

        DEFAULT_NIO_THREAD_COUNT = 4;  
    }  

    public SubReactorThreadGroup() {  
        this(DEFAULT_NIO_THREAD_COUNT);  
    }  

    public SubReactorThreadGroup(int threadCount) {  

        if(threadCount < 1) {  
            threadCount = DEFAULT_NIO_THREAD_COUNT;  
        }  

        businessExecutePool = Executors.newFixedThreadPool(threadCount);

        this.nioThreadCount = threadCount;  
        this.nioThreads = new SubReactorThread[threadCount];  
        for(int i = 0; i < threadCount; i ++ ) {  
            this.nioThreads[i] = new SubReactorThread(businessExecutePool);  
            this.nioThreads[i].start(); //构造方法中启动线程，由于nioThreads不会对外暴露，故不会引起线程逃逸  
        }  

        System.out.println("Nio 线程数量：" + threadCount);  
    }  

    public void dispatch(SocketChannel socketChannel) {  
        if(socketChannel != null ) {  
            next().register(new NioTask(socketChannel, SelectionKey.OP_READ));  
        }  
    }  

    protected SubReactorThread next() {  
        return this.nioThreads[ requestCounter.getAndIncrement() %  nioThreadCount ];  
    }  



    public static void main(String[] args) {  
        // TODO Auto-generated method stub  

    }  

}

SubReactor线程实现（IO线程） 

package persistent.prestige.demo.netty.threadmode.t3;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.locks.ReentrantLock;

/** 
 * Nio 线程，专门负责nio read,write 
 * 本类是实例行代码，不会对nio,断线重连，写半包等场景进行处理,旨在理解 Reactor模型（多线程版本） 
 * @author dingwei2 
 * 
 */  
public class SubReactorThread extends Thread {

private Selector selector;
private ExecutorService businessExecutorPool;
private List<NioTask> taskList = new ArrayList<NioTask>(512);
private ReentrantLock taskMainLock = new ReentrantLock();

/**
 * 业务线程池
 * @param businessExecutorPool
 */
public SubReactorThread(ExecutorService businessExecutorPool) {
try {
this.businessExecutorPool = businessExecutorPool;
this.selector = Selector.open();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

/**
 * socket channel
 * 
 * @param socketChannel
 */
public void register(NioTask task) {
if (task != null) {
try {
taskMainLock.lock();
taskList.add(task);
} finally {
taskMainLock.unlock();
}
}
}

// private

public void run() {
while (!Thread.interrupted()) {
Set<SelectionKey> ops = null;
try {
selector.select(1000);
ops = selector.selectedKeys();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
continue;
}

// 处理相关事件
for (Iterator<SelectionKey> it = ops.iterator(); it.hasNext();) {
SelectionKey key = it.next();
it.remove();

try {
if (key.isWritable()) { // 向客户端发送请求
SocketChannel clientChannel = (SocketChannel) key
.channel();
ByteBuffer buf = (ByteBuffer) key.attachment();
buf.flip();
clientChannel.write(buf);
System.out.println("服务端向客户端发送数据。。。");
// 重新注册读事件
clientChannel.register(selector, SelectionKey.OP_READ);
} else if (key.isReadable()) { // 接受客户端请求
System.out.println("服务端接收客户端连接请求。。。");
SocketChannel clientChannel = (SocketChannel) key
.channel();
ByteBuffer buf = ByteBuffer.allocate(1024);
System.out.println(buf.capacity());
clientChannel.read(buf);//解析请求完毕

//转发请求到具体的业务线程；当然，这里其实可以向dubbo那样，支持转发策略，如果执行时间短，
//，比如没有数据库操作等，可以在io线程中执行。本实例，转发到业务线程池
dispatch(clientChannel, buf);

}
} catch (Throwable e) {
e.printStackTrace();
System.out.println("客户端主动断开连接。。。。。。。");
}

}

// 注册事件
if (!taskList.isEmpty()) {
try {
taskMainLock.lock();
for (Iterator<NioTask> it = taskList
.iterator(); it.hasNext();) {
NioTask task = it.next();
try {
SocketChannel sc = task.getSc();
if(task.getData() != null) {
sc.register(selector, task.getOp(), task.getData());
} else {
sc.register(selector, task.getOp());
}

} catch (Throwable e) {
e.printStackTrace();// ignore
}
it.remove();
}

} finally {
taskMainLock.unlock();
}
}

}
}

/**
 * 此处的reqBuffer处于可写状态
 * @param sc
 * @param reqBuffer
 */
private void dispatch(SocketChannel sc, ByteBuffer reqBuffer) {
businessExecutorPool.submit( new Handler(sc, reqBuffer, this)  );
}
}

NioTask,NIO相关任务封装类： 

package persistent.prestige.demo.netty.threadmode.t3;

import java.io.Serializable;
import java.nio.channels.SocketChannel;

/**
 * Nio task
 * @author Administrator
 *
 */
public class NioTask implements Serializable {

private SocketChannel sc;
private int op;
private Object data;

public NioTask(SocketChannel sc, int op) {
this.sc = sc;
this.op = op;
}

public NioTask(SocketChannel sc, int op, Object data) {
this(sc, op);
this.data = data;
}
public SocketChannel getSc() {
return sc;
}
public void setSc(SocketChannel sc) {
this.sc = sc;
}
public int getOp() {
return op;
}
public void setOp(int op) {
this.op = op;
}
public Object getData() {
return data;
}
public void setData(Object data) {
this.data = data;
}



}
业务Handle类实现： 

package persistent.prestige.demo.netty.threadmode.t3;

import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.SocketChannel;

/**
 * 业务线程
 * 该handler的功能就是在收到的请求信息，后面加上 hello,服务器收到了你的信息，然后返回给客户端
 * @author Administrator
 *
 */
public class Handler implements Runnable {

private static final byte[] b = "hello,服务器收到了你的信息。".getBytes(); // 服务端给客户端的响应

private SocketChannel sc;
private ByteBuffer reqBuffer;
private SubReactorThread parent;

public Handler(SocketChannel sc, ByteBuffer reqBuffer,
SubReactorThread parent) {
super();
this.sc = sc;
this.reqBuffer = reqBuffer;
this.parent = parent;
}

public void run() {
System.out.println("业务在handler中开始执行。。。");
// TODO Auto-generated method stub
//业务处理
reqBuffer.put(b);
parent.register(new NioTask(sc, SelectionKey.OP_WRITE, reqBuffer));
System.out.println("业务在handler中执行结束。。。");
}

}


Nio客户端的实现，与上文一样。


注：本文代码旨在理解Reactor反应堆线程模型，对nio涉及到的断线重连，写半包等未做处理。本文关于Reactor模型的三个图片来源与网络，非原创，如果有侵权，请联系作者，将马上删除，谢谢。





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