请教关于AIO实现非阻塞通信的问题

zhuailhw123 2018-06-14 03:55:21

这里用了线程池来管理一部的channel 并使用CompletionHandler来监听异步IO操作

public class AIOServer
{
static final int PORT = 30000;
final static String UTF_8 = "utf-8";
static List<AsynchronousSocketChannel> channelList
= new ArrayList<>();
public void startListen() throws InterruptedException,
Exception
{
// 创建一个线程池
ExecutorService executor = Executors.newFixedThreadPool(20);
// 以指定线程池来创建一个AsynchronousChannelGroup
AsynchronousChannelGroup channelGroup = AsynchronousChannelGroup
.withThreadPool(executor);
// 以指定线程池来创建一个AsynchronousServerSocketChannel
AsynchronousServerSocketChannel serverChannel
= AsynchronousServerSocketChannel.open(channelGroup)
// 指定监听本机的PORT端口
.bind(new InetSocketAddress(PORT));
// 使用CompletionHandler接受来自客户端的连接请求
serverChannel.accept(null, new AcceptHandler(serverChannel)); // ①
Thread.sleep(100000);
}
public static void main(String[] args)
throws Exception
{
AIOServer server = new AIOServer();
server.startListen();
}
}
// 实现自己的CompletionHandler类
class AcceptHandler implements
CompletionHandler<AsynchronousSocketChannel, Object>
{
private AsynchronousServerSocketChannel serverChannel;
public AcceptHandler(AsynchronousServerSocketChannel sc)
{
this.serverChannel = sc;
}
// 定义一个ByteBuffer准备读取数据
ByteBuffer buff = ByteBuffer.allocate(1024);
// 当实际IO操作完成时候触发该方法
@Override
public void completed(final AsynchronousSocketChannel sc
, Object attachment)
{
// 记录新连接的进来的Channel
AIOServer.channelList.add(sc);
// 准备接受客户端的下一次连接
serverChannel.accept(null , this);
sc.read(buff , null
, new CompletionHandler<Integer,Object>() // ②
{
@Override
public void completed(Integer result
, Object attachment)
{
buff.flip();
// 将buff中内容转换为字符串
String content = StandardCharsets.UTF_8
.decode(buff).toString();
// 遍历每个Channel，将收到的信息写入各Channel中
for(AsynchronousSocketChannel c : AIOServer.channelList)
{
try
{
c.write(ByteBuffer.wrap(content.getBytes(
AIOServer.UTF_8))).get();
}
catch (Exception ex)
{
ex.printStackTrace();
}
}
buff.clear();
// 读取下一次数据
sc.read(buff , null , this);
}
@Override
public void failed(Throwable ex, Object attachment)
{
System.out.println("读取数据失败: " + ex);
// 从该Channel读取数据失败，就将该Channel删除
AIOServer.channelList.remove(sc);
}
});
}
@Override
public void failed(Throwable ex, Object attachment)
{
System.out.println("连接失败: " + ex);
}
}

一开始我没有写 Thread.sleep(100000); 结果程序运行不起来加上这句就可以了但是只能运行100秒我如何让这个程序一直运行下去呢？
还有这里采用了线程池的方法管理，我除了创建了线程池就才也没操作过，线程池在这里是如何工作的？谢谢

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