/** Stop the listener */
public void stopListening(ListenKey listener) throws IOException {
if (!(listener instanceof SocketListenKey)) {
throw new IllegalArgumentException("Invalid listener");
}
synchronized (listener) {
ServerSocket ss = ((SocketListenKey) listener).socket();
// if the ServerSocket has been closed it means
// the listener is invalid
if (ss.isClosed()) {
throw new IllegalArgumentException("Invalid listener");
}
ss.close();
}
}
/** Accept a connection from a debuggee and handshake with it. */
public Connection accept(ListenKey listener, long acceptTimeout, long handshakeTimeout)
throws IOException {
if (acceptTimeout < 0 || handshakeTimeout < 0) {
throw new IllegalArgumentException("timeout is negative");
}
if (!(listener instanceof SocketListenKey)) {
throw new IllegalArgumentException("Invalid listener");
}
ServerSocket ss;
// obtain the ServerSocket from the listener - if the
// socket is closed it means the listener is invalid
synchronized (listener) {
ss = ((SocketListenKey) listener).socket();
if (ss.isClosed()) {
throw new IllegalArgumentException("Invalid listener");
}
}
// from here onwards it's possible that the ServerSocket
// may be closed by a call to stopListening - that's okay
// because the ServerSocket methods will throw an
// IOException indicating the socket is closed.
//
// Additionally, it's possible that another thread calls accept
// with a different accept timeout - that creates a same race
// condition between setting the timeout and calling accept.
// As it is such an unlikely scenario (requires both threads
// to be using the same listener we've chosen to ignore the issue).
ss.setSoTimeout((int) acceptTimeout);
Socket s;
try {
s = ss.accept();
} catch (SocketTimeoutException x) {
throw new TransportTimeoutException("timeout waiting for connection");
}
// handshake here
handshake(s, handshakeTimeout);
return new SocketConnection(s);
}