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IntgenServer.java
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83 lines (76 loc) · 2.57 KB
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import java.nio.*;
import java.nio.channels.*;
import java.net.*;
import java.util.*;
import java.io.IOException;
public class IntgenServer {
public static int DEFAULT_PORT = 1919;
public static void main(String[] args) {
int port;
try {
port = Integer.parseInt(args[0]);
} catch (RuntimeException ex) {
port = DEFAULT_PORT;
}
System.out.println("Listening for connections on port " + port);
ServerSocketChannel serverChannel;
Selector selector;
try {
serverChannel = ServerSocketChannel.open();
ServerSocket ss = serverChannel.socket();
InetSocketAddress address = new InetSocketAddress(port);
ss.bind(address);
serverChannel.configureBlocking(false);
selector = Selector.open();
serverChannel.register(selector, SelectionKey.OP_ACCEPT);
} catch (IOException ex) {
ex.printStackTrace();
return;
}
while (true) {
try {
selector.select();
} catch (IOException ex) {
ex.printStackTrace();
break;
}
Set<SelectionKey> readyKeys = selector.selectedKeys();
Iterator<SelectionKey> iterator = readyKeys.iterator();
while (iterator.hasNext()) {
SelectionKey key = iterator.next();
iterator.remove();
try {
if (key.isAcceptable()) {
ServerSocketChannel server = (ServerSocketChannel) key.channel();
SocketChannel client = server.accept();
System.out.println("Accepted connection from " + client);
client.configureBlocking(false);
SelectionKey key2 = client.register(selector, SelectionKey.
OP_WRITE);
ByteBuffer output = ByteBuffer.allocate(4);
output.putInt(0);
output.flip();
key2.attach(output);
} else if (key.isWritable()) {
SocketChannel client = (SocketChannel) key.channel();
ByteBuffer output = (ByteBuffer) key.attachment();
if (! output.hasRemaining()) {
output.rewind();
int value = output.getInt();
output.clear();
output.putInt(value + 1);
output.flip();
}
client.write(output);
}
} catch (IOException ex) {
key.cancel();
try {
key.channel().close();
}
catch (IOException cex) {}
}
}
}
}
}