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package derms.net.runicast;
import derms.io.Serial;
import derms.net.MessagePayload;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.DatagramChannel;
import java.util.Queue;
import java.util.concurrent.atomic.AtomicLong;
import java.util.logging.Logger;
/** Receive acknowledgements. Remove messages from the sent queue once they are acknowledged. */
class ReceiveAcks<T extends MessagePayload> implements Runnable {
private static final int bufSize = 8192;
private final AtomicLong unacked;
private final Queue<Message<T>> sent;
private final DatagramChannel sock;
private final Logger log;
ReceiveAcks(AtomicLong unacked, Queue<Message<T>> sent, DatagramChannel sock) {
this.unacked = unacked;
this.sent = sent;
this.sock = sock;
this.log = Logger.getLogger(getClass().getName());
}
@Override
public void run() {
ByteBuffer buf = ByteBuffer.allocate(bufSize);
for (;;) {
buf.clear();
try {
sock.receive(buf);
Ack ack = Serial.decode(buf, Ack.class);
recvAck(ack.seq);
} catch (ClosedChannelException e) {
log.info("Shutting down.");
return;
} catch (IOException | ClassNotFoundException | ClassCastException e) {
log.warning(e.getMessage());
}
}
}
private void recvAck(long ack) {
log.info("Received ack: " + ack);
unacked.updateAndGet((unacked) -> {
if (ack >= unacked)
return ack+1;
return unacked;
});
while (!sent.isEmpty() && sent.peek().seq <= ack)
sent.remove();
}
}
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