From c6a6f1d4eb96d6d4854ee66fcf6156b638d80248 Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Thu, 14 Nov 2024 11:30:35 -0500
Subject: ReliableMulticast: send()

---
 .../derms/net/rmulticast/ReliableMulticast.java    | 84 ++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 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
new file mode 100644
index 0000000..464cbb5
--- /dev/null
+++ b/src/main/java/derms/net/rmulticast/ReliableMulticast.java
@@ -0,0 +1,84 @@
+package derms.net.rmulticast;
+
+import derms.net.Packet;
+
+import java.io.IOException;
+import java.io.Serializable;
+import java.net.*;
+import java.time.Instant;
+import java.util.Set;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.logging.Logger;
+
+/** TODO */
+public class ReliableMulticast<T extends Serializable & Hashable> {
+    private final Set<MessageID> positiveAcks; // Positively acknowledged messages.
+    private final Set<MessageID> negativeAcks; // Negatively acknowledged messages.
+    private final Set<Message<T>> received;
+    private final Set<MessageID> retransmissions; // Messages pending retransmission.
+    private final AtomicReference<Instant> lastSend;
+    private final SocketAddress group;
+    private final MulticastSocket inSock, outSock;
+    private final InetAddress laddr; // Local address.
+    private final BlockingQueue<Message<T>> delivered;
+    private final Logger log;
+
+    public ReliableMulticast(InetSocketAddress group, InetAddress laddr) throws IOException {
+        this.positiveAcks = new ConcurrentHashMap<MessageID, Void>().keySet();
+        this.negativeAcks = new ConcurrentHashMap<MessageID, Void>().keySet();
+        this.received = new ConcurrentHashMap<Message<T>, Void>().keySet();
+        this.retransmissions = new ConcurrentHashMap<MessageID, Void>().keySet();
+        this.lastSend = new AtomicReference<Instant>(Instant.now());
+
+        this.group = group;
+
+        this.inSock = new MulticastSocket();
+        this.inSock.joinGroup(group.getAddress());
+
+        this.outSock = new MulticastSocket(group.getPort());
+        this.outSock.joinGroup(group.getAddress());
+
+        this.laddr = laddr;
+
+        this.delivered = new LinkedBlockingQueue<Message<T>>();
+        (new Thread(new Receiver())).start();
+
+        this.log = Logger.getLogger(this.getClass().getName());
+    }
+
+    public void send(T payload) throws IOException {
+        Message<T> msg = new Message<T>(
+                payload,
+                laddr,
+                positiveAcks.toArray(new MessageID[0]),
+                negativeAcks.toArray(new MessageID[0]));
+        DatagramPacket pkt = Packet.encode(msg, group);
+        outSock.send(pkt);
+        positiveAcks.clear();
+        (new Thread(new Timeout(msg.id()))).start();
+        lastSend.set(Instant.now());
+    }
+
+    private class Receiver implements Runnable {
+        @Override
+        public void run() {
+            // TODO
+        }
+    }
+
+    private class Timeout implements Runnable {
+        MessageID mid;
+
+        private Timeout(MessageID mid) {
+            this.mid = mid;
+        }
+
+        @Override
+        public void run() {
+            // TODO
+        }
+    }
+}
-- 
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