Detecting When a Non-Blocking Socket Is Closed by the Remote Host

Question

Hi,
Using NIO non blocked sockets how do I detect when a Non-Blocking Socket Is Closed by the Remote Host?
What I have read is:
The only way to detect that the remote host has closed the connection is to attempt to read or write from the connection. If the remote host properly closed the connection, read() will return -1. If the connection was not terminated normally, read() and write() will throw an exception.
I have written a server test program using NIO and an applet connecting to the server program via sockets.
When I after a successful connection shuts down the browser following happens: The code below comes in an endless loop though mySelector.select returns 0 every time. (The selector is registered for OP_READ). size = 1.
while (true) {
int n = mySelector.select();
int size = mySelector.keys().size();
if (n == 0) continue;
Is this an expected result?
How do I get to know what client has lost connection?
My environment:
W2000
java 1.4.1 build 1.4.1_01-b01
Browser used: IE 5.0
Many thanks for your help on this matter!
Regards Magnus Wistr�m

Answer 1

What you're doing looks OK to me.
I wonder whether your thread is being interrupted by Thread.intterupt() somewhere. Try putting a Thread.interrupted() before the select call.
Sylvia.