package com.manning.nettyinaction.chapter4;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
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;
/**
* Listing 4.2 of <i>Netty in Action</i>
*
* @author <a href="mailto:norman.maurer@googlemail.com">Norman Maurer</a>
*/
public class PlainNioServer {
public void serve(int port) throws IOException {
ServerSocketChannel serverChannel = ServerSocketChannel.open();
serverChannel.configureBlocking(false);
ServerSocket ss = serverChannel.socket();
InetSocketAddress address = new InetSocketAddress(port);
ss.bind(address);
Selector selector = Selector.open();
serverChannel.register(selector, SelectionKey.OP_ACCEPT);
final ByteBuffer msg = ByteBuffer.wrap("Hi!\r\n".getBytes());
for (;;) {
try {
selector.select();
} catch (IOException ex) {
ex.printStackTrace();
// handle exception
break;
}
Set<SelectionKey> readyKeys = selector.selectedKeys(); //5
Iterator<SelectionKey> iterator = readyKeys.iterator();
while (iterator.hasNext()) {
SelectionKey key = iterator.next();
iterator.remove();
try {
if (key.isAcceptable()) { //6
ServerSocketChannel server =
(ServerSocketChannel)key.channel();
SocketChannel client = server.accept();
client.configureBlocking(false);
client.register(selector, SelectionKey.OP_WRITE |
SelectionKey.OP_READ, msg.duplicate()); //7
System.out.println(
"Accepted connection from " + client);
}
if (key.isWritable()) { //8
SocketChannel client =
(SocketChannel)key.channel();
ByteBuffer buffer =
(ByteBuffer)key.attachment();
while (buffer.hasRemaining()) {
if (client.write(buffer) == 0) { //9
break;
}
}
client.close(); //10
}
} catch (IOException ex) {
key.cancel();
try {
key.channel().close();
} catch (IOException cex) {
// ignore on close
}
}
}
}
}
}