From 1305d223fafc79be7fad07aee1f4348b2eaeaae5 Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Sat, 23 Nov 2024 13:12:29 -0500
Subject: rmulticast: use DatagramChannel

---
 .../derms/net/rmulticast/ReliableMulticast.java    | 30 ++++++++++++++--------
 1 file changed, 19 insertions(+), 11 deletions(-)

(limited to 'src/main/java/derms/net/rmulticast/ReliableMulticast.java')

diff --git a/src/main/java/derms/net/rmulticast/ReliableMulticast.java b/src/main/java/derms/net/rmulticast/ReliableMulticast.java
index c23baaa..b194c96 100644
--- a/src/main/java/derms/net/rmulticast/ReliableMulticast.java
+++ b/src/main/java/derms/net/rmulticast/ReliableMulticast.java
@@ -1,12 +1,16 @@
 package derms.net.rmulticast;
 
+import derms.io.Serial;
 import derms.net.ConcurrentMulticastSocket;
 import derms.net.MessagePayload;
+import derms.net.Net;
 import derms.net.Packet;
 import derms.util.ThreadPool;
 
 import java.io.IOException;
 import java.net.*;
+import java.nio.ByteBuffer;
+import java.nio.channels.DatagramChannel;
 import java.time.Duration;
 import java.util.Set;
 import java.util.concurrent.*;
@@ -26,7 +30,7 @@ public class ReliableMulticast<T extends MessagePayload> {
     private final ReceivedSet<T> received;
     private final BlockingQueue<Message<T>> retransmissions; // Messages pending retransmission.
     private final Set<InetAddress> groupMembers;
-    private final ConcurrentMulticastSocket outSock;
+    private final DatagramChannel sock;
     private final BlockingQueue<Message<T>> delivered;
     private final Logger log;
     private final ExecutorService pool;
@@ -47,24 +51,28 @@ public class ReliableMulticast<T extends MessagePayload> {
         this.retransmissions = new LinkedBlockingQueue<Message<T>>();
         this.groupMembers = ConcurrentHashMap.newKeySet();
 
-        this.outSock = new ConcurrentMulticastSocket();
-        this.outSock.joinGroup(group.getAddress());
+        NetworkInterface ifs = Net.getMulticastInterface();
+        this.sock = DatagramChannel.open(StandardProtocolFamily.INET)
+                .setOption(StandardSocketOptions.SO_REUSEADDR, true)
+                .bind(new InetSocketAddress(group.getAddress(), group.getPort()))
+                .setOption(StandardSocketOptions.IP_MULTICAST_IF, ifs);
+        sock.join(group.getAddress(), ifs);
 
         this.delivered = new LinkedBlockingQueue<Message<T>>();
 
         this.log = Logger.getLogger(this.getClass().getName());
 
         this.pool = Executors.newCachedThreadPool();
-        pool.execute(new Receive<T>(group, acks, nacks, received, retransmissions, groupMembers, delivered));
-        pool.execute(new Retransmit<T>(retransmissions, outSock, group));
+        pool.execute(new Receive<T>(sock, acks, nacks, received, retransmissions, groupMembers, delivered));
+        pool.execute(new Retransmit<T>(retransmissions, sock, group));
         pool.execute(new Prune<T>(received, groupMembers));
-        pool.execute(new Heartbeat(group, laddr, acks, nacks, outSock));
+        pool.execute(new Heartbeat(group, laddr, acks, nacks, sock));
     }
 
-    public void close() {
+    public void close() throws IOException {
         log.info("Shutting down...");
+        sock.close();
         ThreadPool.shutdownNow(pool, log);
-        outSock.close();
         log.info("Finished shutting down.");
     }
 
@@ -75,11 +83,11 @@ public class ReliableMulticast<T extends MessagePayload> {
                 laddr,
                 acks.toArray(new MessageID[0]),
                 nacks.toArray(new MessageID[0]));
-        DatagramPacket pkt = Packet.encode(msg, group);
-        outSock.send(pkt);
+        ByteBuffer buf = Serial.encode(msg);
+        sock.send(buf, group);
         acks.clear();
         (new Thread(new Timeout<T>(msg, acks, retransmissions))).start();
-        log.info("Sent " + msg + " from " + outSock + " to " + group);
+        log.info("Sent " + msg + " from " + sock.getLocalAddress() + " to " + group);
     }
 
     /** Receive a message from the group, blocking if necessary until a message arrives. */
-- 
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