Java AIO-异步通信
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Java AIO-异步通信
标签: NIO2.0AIO异步非阻塞通信
2016-08-04 02:25 395人阅读 评论(0)收藏举报
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AIO(Asynchronous IO)即异步IO,特别需要说明的是,JavaAIO需要JDK 1.7的支持
客户端
- package com.test.client;
- import java.io.IOException;
- import java.net.InetSocketAddress;
- import java.net.StandardSocketOptions;
- import java.nio.channels.AsynchronousChannelGroup;
- import java.nio.channels.AsynchronousSocketChannel;
- import java.util.concurrent.CountDownLatch;
- import java.util.concurrent.ExecutorService;
- import java.util.concurrent.Executors;
- import org.apache.log4j.Logger;
- import com.test.handler.client.ConnectCompleteHandler;
- public class Client {
- private Logger logger = Logger.getLogger(Client.class);
- private String host = "127.0.0.1";
- private int port = 9999;
- private int poolSize = 10;
- private static CountDownLatch serverStatus = new CountDownLatch(1);
- public Client() throws Exception {
- try {
- //池中的每个线程都在等待IO事件,当IO操作完成后,调用池中的线程处理CompleteHandler
- ExecutorService threadPool = Executors.newFixedThreadPool(poolSize);
- AsynchronousChannelGroup asyncChannelGroup
- = AsynchronousChannelGroup.withThreadPool(threadPool);
- AsynchronousSocketChannel asyncSocketChannel =
- AsynchronousSocketChannel.open(asyncChannelGroup);
- asyncSocketChannel.setOption(StandardSocketOptions.TCP_NODELAY, true);
- asyncSocketChannel.connect(new InetSocketAddress(host, port),
- null, new ConnectCompleteHandler(asyncSocketChannel));
- } catch (IOException e) {
- logger.error("Cilent socket establish failed!");
- throw e;
- }
- }
- public static void main(String[] args) throws Exception {
- Client client = new Client();
- serverStatus.await();
- }
- }
客户端处理器
- package com.test.handler.client;
- import java.io.UnsupportedEncodingException;
- import java.nio.ByteBuffer;
- import java.nio.channels.AsynchronousSocketChannel;
- import java.nio.channels.CompletionHandler;
- import org.apache.log4j.Logger;
- //CompletionHandler<V,A>
- //V-IO操作的结果,AsynchronousSocketChannel.open创建的异步连接,
- // asyncSocketChannel.connect实际没有IO操作,因此IO操作的结果为Void
- //A-IO操作附件,
- public class ConnectCompleteHandler
- implements CompletionHandler<Void, Object> {
- private Logger logger = Logger.getLogger(ConnectCompleteHandler.class);
- AsynchronousSocketChannel asyncSocketChannel;
- public ConnectCompleteHandler(
- AsynchronousSocketChannel asyncSocketChannel){
- this.asyncSocketChannel = asyncSocketChannel;
- }
- @Override
- public void completed(Void result, Object attachment) {
- //使用asyncChannelGroup中保存的线程池中的线程进行处理
- logger.info("Deal thread of [ConnectCompleteHandler] : "
- + Thread.currentThread().getName());
- String request = "Hi, this is client!";
- logger.info("The request sent by client is : " + request);
- try {
- byte[] reqBytes = request.getBytes("utf-8");
- ByteBuffer writeByteBuffer = ByteBuffer.allocate(reqBytes.length);
- writeByteBuffer.put(reqBytes);
- writeByteBuffer.flip();
- asyncSocketChannel.write(writeByteBuffer, asyncSocketChannel,
- new WriteCompleteHandler());
- } catch (UnsupportedEncodingException e) {
- e.printStackTrace();
- }
- }
- @Override
- public void failed(Throwable exc, Object attachment) {
- logger.error("Connection error!");
- }
- }
- package com.test.handler.client;
- import java.nio.ByteBuffer;
- import java.nio.channels.AsynchronousSocketChannel;
- import java.nio.channels.CompletionHandler;
- import org.apache.log4j.Logger;
- //CompletionHandler<V,A>
- //V-IO操作的结果,这里是write操作写成功的字节数
- //A-IO操作附件,这里传入AsynchronousSocketChannel便于获得服务端响应
- public class WriteCompleteHandler
- implements CompletionHandler<Integer, AsynchronousSocketChannel> {
- private Logger logger = Logger.getLogger(WriteCompleteHandler.class);
- @Override
- public void completed(Integer result,
- AsynchronousSocketChannel asyncSocketChannel) {
- logger.info("Deal thread of [WriteCompleteHandler] : "
- + Thread.currentThread().getName());
- logger.info("Write bytes : " + result.intValue());
- if(result.intValue() == -1){
- logger.error("Send request to server error!");
- }else{
- ByteBuffer readByteBuffer = ByteBuffer.allocate(100);
- //获取服务端发送的响应
- asyncSocketChannel.read(readByteBuffer, readByteBuffer,
- new ReadCompleteHandler());
- }
- }
- @Override
- public void failed(Throwable exc,
- AsynchronousSocketChannel asyncSocketChannel) {
- logger.error("Write message error!");
- exc.printStackTrace();
- }
- }
- package com.test.handler.client;
- import java.io.UnsupportedEncodingException;
- import java.nio.ByteBuffer;
- import java.nio.channels.CompletionHandler;
- import org.apache.log4j.Logger;
- //CompletionHandler<V,A>
- //V-IO操作的结果,这里是read操作成功读取的字节数
- //A-IO操作附件,由于WriteCompleteHandler中调用asyncSocketChannel.read方法时
- // 传入了ByteBuffer,所以这里是ByteBuffer
- public class ReadCompleteHandler
- implements CompletionHandler<Integer, ByteBuffer> {
- private Logger logger = Logger.getLogger(ReadCompleteHandler.class);
- @Override
- public void completed(Integer result, ByteBuffer respByteBuffer) {
- logger.info("Deal thread of [ReadCompleteHandler] : "
- + Thread.currentThread().getName());
- logger.info("Read bytes : " + result.intValue());
- if(result.intValue() == -1){
- logger.error("Get response from server error!");
- }else{
- respByteBuffer.flip();
- byte[] respBytes = new byte[respByteBuffer.remaining()];
- respByteBuffer.get(respBytes);
- try {
- String response = new String(respBytes, "utf-8");
- logger.info("The response sent by server is : " + response);
- } catch (UnsupportedEncodingException e) {
- e.printStackTrace();
- }
- }
- }
- @Override
- public void failed(Throwable exc, ByteBuffer readByteBuffer) {
- logger.error("Read message error!");
- exc.printStackTrace();
- }
- }
服务端
- package com.test.server;
- import java.net.InetSocketAddress;
- import java.net.StandardSocketOptions;
- import java.nio.channels.AsynchronousChannelGroup;
- import java.nio.channels.AsynchronousServerSocketChannel;
- import java.nio.channels.AsynchronousSocketChannel;
- import java.util.concurrent.CountDownLatch;
- import java.util.concurrent.ExecutorService;
- import java.util.concurrent.Executors;
- import java.util.concurrent.Future;
- import org.apache.log4j.Logger;
- import com.test.handler.server.ConnectCompleteHandler;
- public class Server {
- private Logger logger = Logger.getLogger(Server.class);
- private String host = "127.0.0.1";
- private int port = 9999;
- private int poolSize = 10;
- private static CountDownLatch serverStatus = new CountDownLatch(1);
- private AsynchronousServerSocketChannel asyncServerSocketChannel;
- public Server() throws Exception {
- try{
- //池中的每个线程都在等待IO事件,当IO操作完成后,触发相应的IO时间,调用池中的线程IO回调函数(CompleteHandler)
- ExecutorService threadPool = Executors.newFixedThreadPool(poolSize);
- AsynchronousChannelGroup asyncChannelGroup
- = AsynchronousChannelGroup.withThreadPool(threadPool);
- asyncServerSocketChannel = AsynchronousServerSocketChannel.open(asyncChannelGroup);
- asyncServerSocketChannel.setOption(StandardSocketOptions.SO_REUSEADDR, true);
- asyncServerSocketChannel.bind(new InetSocketAddress(host, port));
- logger.info("Server start up!");
- }catch(Exception e){
- logger.error("Server establish error!");
- throw e;
- }
- }
- public void service(){
- // 这种写法将抛出java.nio.channels.AcceptPendingException异常
- // 只有一个连接建立成功之后,才能再建立下一个连接
- // while(true){
- // asyncServerSocketChannel.accept();
- // }
- // AIO支持直接返回Future对象,但其实此刻调用并未完成,
- // while(true){
- // try {
- // Future<AsynchronousSocketChannel> acceptFuture = asyncServerSocketChannel.accept();
- //// wait直到调用完成
- // AsynchronousSocketChannel asyncSocketChannel = acceptFuture.get();
- // logger.info("Connection complete!");
- // } catch (Exception e) {
- // e.printStackTrace();
- // }
- // }
- // 由于asyncChannelGroup的存在,回调是更好的实现方式
- asyncServerSocketChannel.accept(asyncServerSocketChannel, new ConnectCompleteHandler());
- }
- public static void main(String[] args) throws Exception {
- Server server = new Server();
- server.service();
- //由于AIO的方法都是直接返回的,这里必须使用锁以避免线程退出,服务停止
- //所谓AIO,既发起请求之后,当前线程可以去干别的事,当请求完成后会得到通知
- //作为一个全职服务端,main线程其实也没什么别的事情可干,也许还是客户端更加适合使用AIO
- serverStatus.await();
- }
- }
服务端处理器
- package com.test.handler.server;
- import java.nio.ByteBuffer;
- import java.nio.channels.AsynchronousServerSocketChannel;
- import java.nio.channels.AsynchronousSocketChannel;
- import java.nio.channels.CompletionHandler;
- import org.apache.log4j.Logger;
- // CompletionHandler<V,A>
- // V-IO操作的结果,这里是成功建立的连接,AsynchronousSocketChannel
- // A-IO操作附件,这里传入AsynchronousServerSocketChannel便于继续接收请求建立新连接
- public class ConnectCompleteHandler
- implements CompletionHandler<AsynchronousSocketChannel,
- AsynchronousServerSocketChannel> {
- private Logger logger = Logger.getLogger(ConnectCompleteHandler.class);
- @Override
- public void completed(AsynchronousSocketChannel asyncSocketChannel,
- AsynchronousServerSocketChannel asyncServerSocketChannel) {
- //使用asyncChannelGroup中保存的线程池中的线程进行处理
- logger.info("Deal thread of [ConnectCompleteHandler] : "
- + Thread.currentThread().getName());
- //当前连接建立成功后,接收下一个请求建立新的连接
- asyncServerSocketChannel.accept(asyncServerSocketChannel,
- new ConnectCompleteHandler());
- //ByteBuffer是非线程安全的,如果要在多个线程间共享同一个ByteBuffer,需要考虑线程安全性问题
- ByteBuffer readByteBuffer = ByteBuffer.allocate(100);
- //获取客户端发送的请求
- asyncSocketChannel.read(readByteBuffer, readByteBuffer,
- new ReadCompleteHandler(asyncSocketChannel));
- }
- @Override
- public void failed(Throwable exc, AsynchronousServerSocketChannel attachment) {
- logger.error("Connection error!");
- }
- }
- package com.test.handler.server;
- import java.io.UnsupportedEncodingException;
- import java.nio.ByteBuffer;
- import java.nio.channels.AsynchronousSocketChannel;
- import java.nio.channels.CompletionHandler;
- import org.apache.log4j.Logger;
- //CompletionHandler<V,A>
- //V-IO操作的结果,这里是read操作成功读取的字节数
- //A-IO操作附件,由于ConnectCompleteHandler中调用asyncSocketChannel.read方法时
- // 传入了ByteBuffer,所以这里为ByteBuffer
- public class ReadCompleteHandler
- implements CompletionHandler<Integer, ByteBuffer> {
- private Logger logger = Logger.getLogger(ReadCompleteHandler.class);
- private AsynchronousSocketChannel asyncSocketChannel;
- public ReadCompleteHandler(AsynchronousSocketChannel asyncSocketChannel){
- this.asyncSocketChannel = asyncSocketChannel;
- }
- @Override
- public void completed(Integer result, ByteBuffer readByteBuffer) {
- logger.info("Deal thread of [ReadCompleteHandler] : "
- + Thread.currentThread().getName());
- logger.info("Read bytes : " + result.intValue());
- if(result.intValue() == -1){
- logger.error("Get request from client error!");
- }else{
- readByteBuffer.flip();
- byte[] reqBytes = new byte[readByteBuffer.remaining()];
- readByteBuffer.get(reqBytes);
- try {
- String request = new String(reqBytes, "utf-8");
- logger.info("The request sent by client is : " + request);
- String response = "Hi, this is server!";
- logger.info("The response has been sent back to client is : "
- + response);
- byte[] respBytes = response.getBytes("utf-8");
- ByteBuffer writeByteBuffer = ByteBuffer.allocate(respBytes.length);
- writeByteBuffer.put(respBytes);
- writeByteBuffer.flip();
- // asyncSocketChannel.write(writeByteBuffer);
- asyncSocketChannel.write(writeByteBuffer, null, new WriteCompleteHandler());
- } catch (UnsupportedEncodingException e) {
- e.printStackTrace();
- }
- }
- }
- @Override
- public void failed(Throwable exc, ByteBuffer readByteBuffer) {
- logger.error("Read message error!");
- exc.printStackTrace();
- }
- }
- package com.test.handler.server;
- import java.nio.channels.CompletionHandler;
- import org.apache.log4j.Logger;
- //CompletionHandler<V,A>
- //V-IO操作的结果,这里是write操作写成功的字节数
- //A-IO操作附件,
- public class WriteCompleteHandler
- implements CompletionHandler<Integer, Object> {
- private Logger logger = Logger.getLogger(WriteCompleteHandler.class);
- @Override
- public void completed(Integer result, Object attachment) {
- logger.info("Deal thread of [WriteCompleteHandler] : "
- + Thread.currentThread().getName());
- logger.info("Write bytes : " + result.intValue());
- if(result.intValue() == -1)
- logger.info("Send response to client error!" );
- else
- logger.info("The response has been sent back to client successfully!" );
- }
- @Override
- public void failed(Throwable exc, Object attachment) {
- logger.error("Write message error!");
- exc.printStackTrace();
- }
- }
log4j日志配置文件
- log4j.rootLogger=info,logOutput
- #log console out put
- log4j.appender.logOutput=org.apache.log4j.ConsoleAppender
- log4j.appender.logOutput.layout=org.apache.log4j.PatternLayout
- log4j.appender.logOutput.layout.ConversionPattern=%p%d{[yy-MM-dd HH:mm:ss]}[%c] -> %m%n
Server端运行结果
- INFO[16-08-04 01:20:22][com.test.server.Server] -> Server start up!
- INFO[16-08-04 01:20:26][com.test.handler.server.ConnectCompleteHandler] -> Deal thread of [ConnectCompleteHandler] : pool-1-thread-1
- INFO[16-08-04 01:20:26][com.test.handler.server.ReadCompleteHandler] -> Deal thread of [ReadCompleteHandler] : pool-1-thread-2
- INFO[16-08-04 01:20:26][com.test.handler.server.ReadCompleteHandler] -> Read bytes : 19
- INFO[16-08-04 01:20:26][com.test.handler.server.ReadCompleteHandler] -> The request sent by client is : Hi, this is client!
- INFO[16-08-04 01:20:26][com.test.handler.server.ReadCompleteHandler] -> The response has been sent back to client is : Hi, this is server!
- INFO[16-08-04 01:20:26][com.test.handler.server.WriteCompleteHandler] -> Deal thread of [WriteCompleteHandler] : pool-1-thread-3
- INFO[16-08-04 01:20:26][com.test.handler.server.WriteCompleteHandler] -> Write bytes : 19
- INFO[16-08-04 01:20:26][com.test.handler.server.WriteCompleteHandler] -> The response has been sent back to client successfully!
Client端运行结果
- INFO[16-08-04 01:20:26][com.test.handler.client.ConnectCompleteHandler] -> Deal thread of [ConnectCompleteHandler] : pool-1-thread-1
- INFO[16-08-04 01:20:26][com.test.handler.client.ConnectCompleteHandler] -> The request sent by client is : Hi, this is client!
- INFO[16-08-04 01:20:26][com.test.handler.client.WriteCompleteHandler] -> Deal thread of [WriteCompleteHandler] : pool-1-thread-2
- INFO[16-08-04 01:20:26][com.test.handler.client.WriteCompleteHandler] -> Write bytes : 19
- INFO[16-08-04 01:20:26][com.test.handler.client.ReadCompleteHandler] -> Deal thread of [ReadCompleteHandler] : pool-1-thread-3
- INFO[16-08-04 01:20:26][com.test.handler.client.ReadCompleteHandler] -> Read bytes : 19
- INFO[16-08-04 01:20:26][com.test.handler.client.ReadCompleteHandler] -> The response sent by server is : Hi, this is server
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