Using NIO for Client Sockets

[Sameer Amte]

I am trying to evaluate the use of NIO for Client Sockets. In our application, we are currently creating one thread per user and each thread has a client socket that is connected to the Server and is constantly get real-time updates.

I'm evaluating the possibility of using Selectors and Channels, so that I dont have to create a thread per user. I tried to tweak the samples provided by Sun and I dont seem to be getting a connect event when my client sockets connects to the server.

Here is my makeConnections method:

   private void makeConnections(String host,int port) throws Exception {
 
Selector connSelector = Selector.open();
sc = SocketChannel.open();
sc.configureBlocking(false);
InetAddress lh = InetAddress.getLocalHost();
isa = new InetSocketAddress("10.5.124.157", 8989);
Thread thread = new Thread (new Runnable(){
public void run()
{
try
{
Thread.sleep(1000);
System.out.println("connecting");
sc.connect(isa);
}
catch(Exception e)
{
e.getMessage();
e.printStackTrace();
}
}
});
SelectionKey connectKey = sc.register(connSelector,
      SelectionKey.OP_CONNECT);
SelectionKey readKey = sc.register(connSelector,
      SelectionKey.OP_READ);
SelectionKey writeKey = sc.register(connSelector,
      SelectionKey.OP_READ);
int keysAdded = 0;
thread.start();

for(; :wink: {
connSelector.select();
    Set readyKeys = connSelector.selectedKeys();
    Iterator i = readyKeys.iterator();
    while (i.hasNext()) {
SelectionKey sk = (SelectionKey)i.next();
i.remove();
SocketChannel nextReady =
    (SocketChannel)sk.channel();
System.out.println(sk.toString());
    }
}
   }

Thanks
Sameer