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package NIO;

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;

public class MultiPortEcho {

private int ports[];

private ByteBuffer echoBuffer = ByteBuffer.allocate(1024);

public MultiPortEcho(int ports[]) throws IOException {

this.ports = ports;

go();

}

private void go() throws IOException {

// Create a new selector

Selector selector = Selector.open();

// Open a listener on each port, and register each one

// with the selector

for (int i = 0; i < ports.length; ++i) {

ServerSocketChannel ssc = ServerSocketChannel.open();

ssc.configureBlocking(false);

ServerSocket ss = ssc.socket();

InetSocketAddress address = new InetSocketAddress(ports[i]);

ss.bind(address);

SelectionKey key = ssc.register(selector, SelectionKey.OP_ACCEPT);

System.out.println("Going to listen on " + ports[i]);

}

while (true) {

int num = selector.select();

Set selectedKeys = selector.selectedKeys();

Iterator it = selectedKeys.iterator();

while (it.hasNext()) {

SelectionKey key = (SelectionKey) it.next();

if ((key.readyOps() & SelectionKey.OP_ACCEPT) == SelectionKey.OP_ACCEPT) {

// Accept the new connection

ServerSocketChannel ssc = (ServerSocketChannel) key

.channel();

SocketChannel sc = ssc.accept();

sc.configureBlocking(false);

// Add the new connection to the selector

SelectionKey newKey = sc.register(selector,

SelectionKey.OP_READ);

it.remove();

System.out.println("Got connection from " + sc);

} else if ((key.readyOps() & SelectionKey.OP_READ) == SelectionKey.OP_READ) {

// Read the data

SocketChannel sc = (SocketChannel) key.channel();

// Echo data

int bytesEchoed = 0;

while (true) {

echoBuffer.clear();

int r = sc.read(echoBuffer);

if (r <= 0) {

break;

}

echoBuffer.flip();

sc.write(echoBuffer);

bytesEchoed += r;

}

System.out.println("Echoed " + bytesEchoed + " from " + sc);

it.remove();

}

}

// System.out.println( "going to clear" );

// selectedKeys.clear();

// System.out.println( "cleared" );

}

}

static public void main(String args[]) throws Exception {

args = new String[] {"5000", "6000", "7000"};

int ports[] = new int[args.length];

for (int i = 0; i < args.length; ++i) {

ports[i] = Integer.parseInt(args[i]);

}

new MultiPortEcho(ports);

}

}