From d5a1ec8b54c1c3c516d07f1916276cd6e5a937e4 Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Sat, 23 Nov 2024 11:34:42 -0500
Subject: runicast: use DatagramChannel

---
 .../derms/net/runicast/ReliableUnicastSender.java  | 36 +++++++++++-----------
 1 file changed, 18 insertions(+), 18 deletions(-)

(limited to 'src/main/java/derms/net/runicast/ReliableUnicastSender.java')

diff --git a/src/main/java/derms/net/runicast/ReliableUnicastSender.java b/src/main/java/derms/net/runicast/ReliableUnicastSender.java
index 83408d5..1f3c5d4 100644
--- a/src/main/java/derms/net/runicast/ReliableUnicastSender.java
+++ b/src/main/java/derms/net/runicast/ReliableUnicastSender.java
@@ -1,14 +1,13 @@
 package derms.net.runicast;
 
-import derms.net.ConcurrentDatagramSocket;
+import derms.io.Serial;
 import derms.net.MessagePayload;
-import derms.net.Packet;
 import derms.util.ThreadPool;
 
 import java.io.IOException;
-import java.net.DatagramPacket;
-import java.net.InetSocketAddress;
-import java.time.Duration;
+import java.net.SocketAddress;
+import java.nio.ByteBuffer;
+import java.nio.channels.DatagramChannel;
 import java.util.Queue;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
@@ -18,12 +17,10 @@ import java.util.logging.Logger;
 
 /** The sending end of a reliable unicast connection. */
 public class ReliableUnicastSender<T extends MessagePayload> {
-    private static final Duration soTimeout = Duration.ofMillis(500); // Socket timeout.
-
     private final AtomicLong next; // Next sequence number.
     private final AtomicLong unacked; // Sequence number of first unacknowledged message.
     private final Queue<Message<T>> sent;
-    private final ConcurrentDatagramSocket sock;
+    private final DatagramChannel sock;
     private final Logger log;
     private final ExecutorService pool;
 
@@ -32,13 +29,12 @@ public class ReliableUnicastSender<T extends MessagePayload> {
      *
      * @param raddr The remote IP address to connect to.
      */
-    public ReliableUnicastSender(InetSocketAddress raddr) throws IOException {
+    public ReliableUnicastSender(SocketAddress raddr) throws IOException {
         this.next = new AtomicLong(0);
         this.unacked = new AtomicLong(0);
         this.sent = new LinkedBlockingQueue<Message<T>>();
-        this.sock = new ConcurrentDatagramSocket();
-        this.sock.connect(raddr);
-        this.sock.setSoTimeout(soTimeout);
+        this.sock = DatagramChannel.open();
+        sock.connect(raddr);
         this.log = Logger.getLogger(getClass().getName());
         this.pool = Executors.newCachedThreadPool();
         pool.execute(new ReceiveAcks<T>(unacked, sent, sock));
@@ -47,28 +43,32 @@ public class ReliableUnicastSender<T extends MessagePayload> {
 
     public void send(T payload) throws IOException {
         Message<T> msg = new Message<T>(next.get(), payload);
-        DatagramPacket pkt = Packet.encode(msg, sock.getRemoteSocketAddress());
-        sock.send(pkt);
+        ByteBuffer buf = Serial.encode(msg);
+        sock.send(buf, sock.getRemoteAddress());
         sent.add(msg);
         next.incrementAndGet();
+        log.info("Sent " + msg);
     }
 
     /** Wait for all messages to be acknowledged and close the connection. */
-    public void close() throws InterruptedException {
+    public void close() throws InterruptedException, IOException {
         // Wait for receiver to acknowledge all sent messages.
+        log.info("Waiting for acknowledgements...");
         while (unacked.get() < next.get()) {
             Thread.yield();
             if (Thread.interrupted())
                 throw new InterruptedException();
         }
 
-        closeNow();
+        log.info("Shutting down.");
+        sock.close();
+        ThreadPool.shutdown(pool, log);
     }
 
     /** Close the connection immediately, without waiting for acknowledgements. */
-    public void closeNow() {
+    public void closeNow() throws IOException {
         log.info("Shutting down.");
-        ThreadPool.shutDown(pool, log);
         sock.close();
+        ThreadPool.shutdownNow(pool, log);
     }
 }
-- 
cgit v1.2.3