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

---
 src/main/java/derms/net/rmulticast/Receive.java | 44 ++++++++++++-------------
 1 file changed, 21 insertions(+), 23 deletions(-)

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

diff --git a/src/main/java/derms/net/rmulticast/Receive.java b/src/main/java/derms/net/rmulticast/Receive.java
index c9e1acf..d39ccf1 100644
--- a/src/main/java/derms/net/rmulticast/Receive.java
+++ b/src/main/java/derms/net/rmulticast/Receive.java
@@ -1,15 +1,14 @@
 package derms.net.rmulticast;
 
-import derms.net.ConcurrentMulticastSocket;
+import com.sun.xml.internal.ws.policy.privateutil.PolicyUtils;
+import derms.io.Serial;
 import derms.net.MessagePayload;
-import derms.net.Packet;
 
 import java.io.IOException;
-import java.net.DatagramPacket;
 import java.net.InetAddress;
-import java.net.InetSocketAddress;
-import java.net.SocketTimeoutException;
-import java.time.Duration;
+import java.nio.ByteBuffer;
+import java.nio.channels.ClosedChannelException;
+import java.nio.channels.DatagramChannel;
 import java.util.NoSuchElementException;
 import java.util.Set;
 import java.util.concurrent.BlockingQueue;
@@ -17,9 +16,8 @@ import java.util.logging.Logger;
 
 class Receive<T extends MessagePayload> implements Runnable {
     private static final int bufSize = 8192;
-    private static final Duration sockTimeout = Duration.ofMillis(500);
 
-    private final ConcurrentMulticastSocket inSock;
+    private final DatagramChannel sock;
     private final Set<MessageID> acks; // Positively acknowledged messages.
     private final Set<MessageID> nacks; // Negatively acknowledged messages.
     private final ReceivedSet<T> received;
@@ -28,36 +26,36 @@ class Receive<T extends MessagePayload> implements Runnable {
     private final BlockingQueue<Message<T>> delivered;
     private final Logger log;
 
-    Receive(InetSocketAddress group, Set<MessageID> acks, Set<MessageID> nacks, ReceivedSet<T> received, BlockingQueue<Message<T>> retransmissions, Set<InetAddress> groupMembers, BlockingQueue<Message<T>> delivered) throws IOException {
-        this.inSock = new ConcurrentMulticastSocket(group.getPort());
-        this.inSock.joinGroup(group.getAddress());
-        this.inSock.setSoTimeout(sockTimeout);
-
+    Receive(DatagramChannel sock, Set<MessageID> acks, Set<MessageID> nacks, ReceivedSet<T> received, BlockingQueue<Message<T>> retransmissions, Set<InetAddress> groupMembers, BlockingQueue<Message<T>> delivered) throws IOException {
         this.acks = acks;
         this.nacks = nacks;
         this.received = received;
         this.retransmissions = retransmissions;
         this.groupMembers = groupMembers;
+        this.sock = sock;
         this.delivered = delivered;
         this.log = Logger.getLogger(this.getClass().getName());
     }
 
     @Override
     public void run() {
-        log.info("Listening on " + inSock);
-        DatagramPacket pkt = new DatagramPacket(new byte[bufSize], bufSize);
+        try {
+            log.info("Listening on " + sock.getLocalAddress());
+        } catch (IOException e) {
+            log.warning(e.getMessage());
+        }
+
+        ByteBuffer buf = ByteBuffer.allocate(bufSize);
         for (;;) {
+            buf.clear();
             try {
-                inSock.receive(pkt);
-                Message<?> msg = Packet.decode(pkt, Message.class);
+                sock.receive(buf);
+                Message<?> msg = Serial.decode(buf, Message.class);
                 receive(msg);
                 log.info("Received " + msg);
-            } catch (SocketTimeoutException e) {
-                if (Thread.interrupted()) {
-                    log.info("Interrupted. Shutting down.");
-                    inSock.close();
-                    return;
-                }
+            } catch (ClosedChannelException e) {
+                log.info("Shutting down.");
+                return;
             } catch (IOException | ClassNotFoundException | ClassCastException e) {
                 log.warning(e.getMessage());
             }
-- 
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