标签：amp sync 线程创建 static 两种 sig cti query nio
我们知道NIO是同步非阻塞，服务器实现模式为一个请求一个线程，即客户端发送的连接请求都会注册到多路复用器上，多路复用器轮询到连接有I/O请求时才启动一个线程进行处理。
而AIO则是则是异步非阻塞的，并且提供了异步文件通道和异步套接字通道的实现。主要通过两种方式获取操作的结果：
public class TimeServer {
public static void main(String[] args){
int port = 8080;
if (args != null && args.length >0){
try{
port = Integer.parseInt(args[0]);
}catch (NumberFormatException e){
}
}
AsyncTimeServerHandler timeServerHandler = new AsyncTimeServerHandler(port);
new Thread(timeServerHandler,"AIO-AsyncTimeServerHandler-001").start();
}
}首先创建异步的时间服务处理器，然后启动线程将异步时间服务Handler拉起
public class AsyncTimeServerHandler implements Runnable{
private int port;
CountDownLatch countDownLatch;
AsynchronousServerSocketChannel channel;
public AsyncTimeServerHandler(int port) {
this.port = port;
try {
channel = AsynchronousServerSocketChannel.open();
channel.bind(new InetSocketAddress(port));
}catch (IOException e){
e.printStackTrace();
}
}
public void run() {
countDownLatch = new CountDownLatch(1);
doAccept();
try {
countDownLatch.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
public void doAccept(){
channel.accept(this,new AcceptCompletionHandler());
}
}在构造方法中，我们创建了一个一步的Channel，然后调用bind方法绑定了监听的端口。
在run方法中我们初始化了一个CountDownLatch对象，是为了在完成一组正在执行的操作之前，线程一直阻塞在那儿
在doAccept方法中接收客户端的连接，我们可以传递一个handler示例接受accept操作成功的通知消息，其代码如下：
public class AcceptCompletionHandler implements CompletionHandler<AsynchronousSocketChannel,AsyncTimeServerHandler>{
@Override
public void completed(AsynchronousSocketChannel result, AsyncTimeServerHandler attachment) {
attachment.channel.accept(attachment,this);
ByteBuffer buffer = ByteBuffer.allocate(1024);
result.read(buffer,buffer,new ReadCompltetionHandler(result));
}
@Override
public void failed(Throwable exc, AsyncTimeServerHandler attachment) {
exc.printStackTrace();
attachment.countDownLatch.countDown();
}
}其中，我们在complete方法中继续调用了accept方法，是为了有新的客户端接入成功，因为一个AsynchronousServerSocketChannel可以接受成千上万个客户端
而链路建立成功以后，服务端可以接受客户端的请求消息了，通过read方法进行异步读操作，其中传入了一个Handler，接受通知回调业务。其代码如下
public class ReadCompltetionHandler implements CompletionHandler<Integer,ByteBuffer>{
private AsynchronousSocketChannel channel;
public ReadCompltetionHandler(AsynchronousSocketChannel channel) {
if (channel == null)
this.channel = channel;
}
@Override
public void completed(Integer result, ByteBuffer attachment) {
attachment.flip();
byte[] body = new byte[attachment.remaining()];
attachment.get(body);
try {
String req = new String(body,"UTF-8");
String curentTime = "QUERY TIME ORDER".equalsIgnoreCase(req)?new Date(
System.currentTimeMillis()
).toString():"BAD ORDER";
doWrite(curentTime);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
private void doWrite(String currentTime){
if (!StringUtil.isNullOrEmpty(currentTime)){
byte[] bytes = currentTime.getBytes();
ByteBuffer buffer = ByteBuffer.allocate(bytes.length);
buffer.put(bytes);
buffer.flip();
channel.write(buffer, buffer, new CompletionHandler<Integer, ByteBuffer>() {
@Override
public void completed(Integer result, ByteBuffer attachment) {
if (buffer.hasRemaining()){
channel.write(buffer,buffer,this);
}
}
@Override
public void failed(Throwable exc, ByteBuffer attachment) {
try {
channel.close();
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
}
@Override
public void failed(Throwable exc, ByteBuffer attachment) {
try {
this.channel.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}其中具体的处理逻辑和NIO的TimeServer相同，不做详细分析了
public class TimeClient {
public static void main(String[] args){
int port = 8080;
if (args != null && args.length >0){
try{
port = Integer.parseInt(args[0]);
}catch (NumberFormatException e){
}
}
AsyncTimeClientHandler timeClientHandler = new AsyncTimeClientHandler("127.0.0.1",port);
new Thread(timeClientHandler,"AIO-AsyncTimeClientHandler-001").start();
}
}在其中我们通过一个I/O线程创建一步时间服务器客户端Handler，具体代码如下：
public class AsyncTimeClientHandler implements CompletionHandler<Void,AsyncTimeClientHandler>,Runnable{
private AsynchronousSocketChannel client;
private String host;
private int port;
private CountDownLatch countDownLatch;
public AsyncTimeClientHandler(String host, int port) {
this.host = host;
this.port = port;
try {
client = AsynchronousSocketChannel.open();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void completed(Void result, AsyncTimeClientHandler attachment) {
byte[] req = "QUERY TIME ORDER".getBytes();
ByteBuffer buffer = ByteBuffer.allocate(req.length);
buffer.put(req);
buffer.flip();
client.write(buffer, buffer, new CompletionHandler<Integer, ByteBuffer>() {
@Override
public void completed(Integer result, ByteBuffer attachment) {
if (attachment.hasRemaining()){
client.write(attachment,attachment,this);
}else{
ByteBuffer readBuffer = ByteBuffer.allocate(1024);
client.read(readBuffer, readBuffer, new CompletionHandler<Integer, ByteBuffer>() {
@Override
public void completed(Integer result, ByteBuffer attachment) {
byte[] bytes = new byte[attachment.remaining()];
attachment.get(bytes);
try {
String body = new String(bytes,"UTF-8");
System.out.print(body);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
@Override
public void failed(Throwable exc, ByteBuffer attachment) {
try {
client.close();
countDownLatch.countDown();
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
}
@Override
public void failed(Throwable exc, ByteBuffer attachment) {
try {
client.close();
countDownLatch.countDown();
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
@Override
public void failed(Throwable exc, AsyncTimeClientHandler attachment) {
exc.printStackTrace();
try {
client.close();
countDownLatch.countDown();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void run() {
countDownLatch = new CountDownLatch(1);
client.connect(new InetSocketAddress(host,port),this,this);
try {
countDownLatch.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
try {
client.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}标签：amp sync 线程创建 static 两种 sig cti query nio
原文地址：https://www.cnblogs.com/junjiang3/p/10228970.html
