Examples of kilim.nio.EndPoint

kilim.nio.EndPoint

The EndPoint represents an open socket connection. It is a wrapper over a non-blocking socket (channel) and belongs to a {@link SessionTask}. It serves as the bridge between the SessionTask and the {@link NioSelectorScheduler}, using a pair of mailboxes for exchanging socket registration and socket ready events.

The other purpose of this class is to provide convenience methods that read from a socket into a bytebuffer, or write from a bytebuffer to the socket. If the socket is not ready for business, the endpoint (and hence the task) simply yields, without registering with the {@link NioSelectorScheduler}. The idea is to give the other runnable tasks a chance to run before retrying the operation (on resumption); this avoids waking up the selector -- an expensive operation -- as much as possible, and introduces a delay between retries. If, after a fixed number of times ( {@link #YIELD_COUNT}), the operation still hasn't succeeded, the endpoint registers itself with the {@link NioSelectorScheduler}, and waits for a socket-ready event from the selector. This scheme is adaptive to load, in that the delay between retries is proportional to the number of runnable tasks. Busy sockets tend to get serviced more often as the socket is always ready.


    public static class EchoServer extends SessionTask {
        @Override
        public void execute() throws Pausable, Exception {
            ByteBuffer buf = ByteBuffer.allocate(100);
            EndPoint ep = getEndPoint();
            while (true) {
                buf.clear();
                buf = ep.fillMessage(buf, 4, /*lengthIncludesItself*/ false);
                buf.flip();
                int strlen = buf.getInt();
                String s= new String(buf.array(), 4, strlen);
                //System.out.println ("Rcvd: " + s);
                if (!s.startsWith("Iteration #")) {
                    ep.close();
                    break;
                } 
                buf.position(0); // reset read pos
                ep.write(buf); // echo.
                if (s.endsWith("DONE")) {
                    ep.close();
                    break;
                }
            }
        }

        @Override
        public void execute() throws Pausable, Exception {
            System.out.println("[" + this.id + "] Connection rcvd"); 
            try {
                while (true) {
                    EndPoint ep = getEndPoint();
                    ByteBuffer buf = ByteBuffer.allocate(PACKET_LEN);
                    buf = ep.fill(buf, PACKET_LEN); // Pauses until at least PACKET_LEN bytes have been rcvd in buf.
                    System.out.println("[" + this.id + "] Received pkt"); 
                    buf.flip();
                    ep.write(buf);
                    System.out.println("[" + this.id + "] Echoed pkt"); 
                }
            } catch (EOFException eofe) {
                System.out.println("[" + this.id + "] Connection terminated"); 
            } catch (IOException ioe) {

Examples of kilim.nio.EndPoint

Related Classes of kilim.nio.EndPoint