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package derms.net.runicast;
import derms.io.Serial;
import derms.net.MessagePayload;
import java.io.IOException;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.DatagramChannel;
import java.util.Queue;
import java.util.logging.Logger;
class Receive<T extends MessagePayload> implements Runnable {
private static final int bufSize = 8192;
private long seq; // Sequence number.
private final DatagramChannel sock;
private final Queue<T> delivered;
private final Logger log;
Receive(DatagramChannel sock, Queue<T> delivered) {
this.seq = 0;
this.sock = sock;
this.delivered = delivered;
this.log = Logger.getLogger(getClass().getName());
}
@Override
public void run() {
ByteBuffer buf = ByteBuffer.allocate(bufSize);
for (;;) {
buf.clear();
try {
SocketAddress sender = sock.receive(buf);
Message<T> msg = (Message<T>) Serial.decode(buf, Message.class);
recv(msg, sender);
} catch (ClosedChannelException e) {
log.info("Shutting down.");
return;
} catch (IOException | ClassNotFoundException | ClassCastException e) {
log.warning(e.getMessage());
}
}
}
private void recv(Message<T> msg, SocketAddress sender) throws IOException {
log.info("Received " + msg);
if (msg.seq == seq) {
delivered.add(msg.payload);
log.info("Delivered " + msg);
ack(msg, sender);
log.info("Acked " + msg);
seq++;
}
}
private void ack(Message<T> msg, SocketAddress sender) throws IOException {
Ack ack = new Ack(msg.seq);
ByteBuffer buf = Serial.encode(ack);
sock.send(buf, sender);
}
}
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