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package derms.net.runicast;
import derms.io.Serial;
import derms.net.MessagePayload;
import derms.util.Wait;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.DatagramChannel;
import java.time.Duration;
import java.util.Queue;
import java.util.concurrent.atomic.AtomicLong;
import java.util.logging.Logger;
/** Retransmit unacknowledged messages. */
class Retransmit<T extends MessagePayload> implements Runnable {
private static final Duration period = Duration.ofMillis(500);
private final AtomicLong unacked;
private final Queue<Message<T>> sent;
private final DatagramChannel sock;
private final Logger log;
Retransmit(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() {
for (;;) {
try {
Wait.forDuration(period);
for (Message<T> msg : sent) {
if (msg.seq >= unacked.get()) {
retransmit(msg);
}
}
} catch (InterruptedException | ClosedChannelException e) {
log.info("Shutting down.");
return;
} catch (IOException e) {
log.warning(e.getMessage());
}
}
}
private void retransmit(Message<T> msg) throws IOException {
ByteBuffer buf = Serial.encode(msg);
sock.send(buf, sock.getRemoteAddress());
log.info("Retransmitted " + msg);
}
}
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