20110801
java se 7 AIO的实现
windows基于IOCP(input/output Completion Port，I/O完成端口) 它是应用程序使用线程池处理异步I/O请求的一种机制.
linux基于epoll (EpollPort)
编程模型
AIO模型相对于之前的编程模型，更加简便，且把线程池隐藏在内部实现中。
服务器端
channelGroup = AsynchronousChannelGroup.withFixedThreadPool(Runtime.getRuntime().availableProcessors(),
Executors.defaultThreadFactory());
final AsynchronousServerSocketChannel listener = openChannel(channelGroup);
listener.setOption(StandardSocketOptions.SO_REUSEADDR, true);
listener.bind(new InetSocketAddress(port));
listener.accept(null, new CompletionHandler<AsynchronousSocketChannel, Void>() {
@Override
public void completed(AsynchronousSocketChannel result, Void attachment) {
// request a new accept and handle the incoming connection
listener.accept(null, this);
System.out.println("new connection" + result);
handleNewConnection(result);
}
@Override
public void failed(Throwable exc, Void attachment) {
}
});
handleNewConnection
ByteBuffer input = ByteBuffer.allocate(256);
if (!channel.isOpen()) {
return;
}
channel.read(input, input, completionHandler);
客户端
AsynchronousChannelGroup group;
try {
group = AsynchronousChannelGroup.withFixedThreadPool(2, Executors.defaultThreadFactory());
final AsynchronousSocketChannel asc = AsynchronousSocketChannel.open(group);
asc.connect(new InetSocketAddress(InetAddress.getByName("localhost"), 5000), null,
new CompletionHandler<Void, Void>() {
/*
* (non-Javadoc)
* @see java.nio.channels.CompletionHandler#completed(java.lang.Object, java.lang.Object)
*/
@Override
public void completed(Void result, Void attachment) {
System.out.println("connected server.");
}
/*
* (non-Javadoc)
* @see java.nio.channels.CompletionHandler#failed(java.lang.Throwable, java.lang.Object)
*/
@Override
public void failed(Throwable exc, Void attachment) {
// TODO Auto-generated method stub
}
});
// 8K
ByteBuffer bb = ByteBuffer.allocate(2 * 1024);
asc.read(bb, bb, new CompletionHandler<Integer, ByteBuffer>() {
/*
* (non-Javadoc)
* @see java.nio.channels.CompletionHandler#completed(java.lang.Object, java.lang.Object)
*/
@Override
public void completed(Integer result, ByteBuffer bb) {
System.out.println(new String(bb.array(), 0, result));
bb.flip();
asc.read(bb, bb, this);
}
/*
* (non-Javadoc)
* @see java.nio.channels.CompletionHandler#failed(java.lang.Throwable, java.lang.Object)
*/
@Override
public void failed(Throwable exc, ByteBuffer attachment) {
// TODO Auto-generated method stub
}
});
byte[] bytes = new byte[1024];
int result = System.in.read(bytes);
ByteBuffer bb1 = ByteBuffer.wrap(bytes, 0, result);
asc.write(bb1, bb1, new CompletionHandler<Integer, ByteBuffer>() {
/*
* (non-Javadoc)
* @see java.nio.channels.CompletionHandler#completed(java.lang.Object, java.lang.Object)
*/
@Override
public void completed(Integer result, ByteBuffer attachment) {
byte[] bytes = new byte[1024];
try {
int result1 = System.in.read(bytes);
ByteBuffer bb1 = ByteBuffer.wrap(bytes, 0, result1);
asc.write(bb1, bb1, this);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/*
* (non-Javadoc)
* @see java.nio.channels.CompletionHandler#failed(java.lang.Throwable, java.lang.Object)
*/
@Override
public void failed(Throwable exc, ByteBuffer attachment) {
// TODO Auto-generated method stub
}
});
// group.shutdownNow();
// group.awaitTermination(1, TimeUnit.SECONDS);