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package derms.net.runicast;
import derms.net.ConcurrentDatagramSocket;
import derms.net.MessagePayload;
import derms.net.Packet;
import java.io.IOException;
import java.net.*;
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 ConcurrentDatagramSocket sock;
private final Queue<T> delivered;
private final Logger log;
Receive(ConcurrentDatagramSocket sock, Queue<T> delivered) {
this.seq = 0;
this.sock = sock;
this.delivered = delivered;
this.log = Logger.getLogger(getClass().getName());
}
@Override
public void run() {
DatagramPacket pkt = new DatagramPacket(new byte[bufSize], bufSize);
for (;;) {
try {
sock.receive(pkt);
Message<T> msg = (Message<T>) Packet.decode(pkt, Message.class);
SocketAddress sender = pkt.getSocketAddress();
recv(msg, sender);
} catch (SocketTimeoutException e) {
if (Thread.interrupted()) {
log.info("Interrupted");
return;
}
} catch (IOException | ClassNotFoundException | ClassCastException e) {
log.warning(e.getMessage());
}
}
}
private void recv(Message<T> msg, SocketAddress sender) throws IOException {
if (msg.seq == seq) {
delivered.add(msg.payload);
ack(msg, sender);
seq++;
}
}
private void ack(Message<T> msg, SocketAddress sender) throws IOException {
Ack ack = new Ack(msg.seq);
DatagramPacket pkt = Packet.encode(ack, sender);
sock.send(pkt);
}
}
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