From 0912e30fb375f60bade22fd8cf7331e1b8d77659 Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Fri, 22 Nov 2024 12:39:53 -0500
Subject: ReliableUnicastReceiver

---
 .../net/runicast/ReliableUnicastReceiver.java      | 56 +++++++++++++++++++++-
 1 file changed, 55 insertions(+), 1 deletion(-)

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

diff --git a/src/main/java/derms/net/runicast/ReliableUnicastReceiver.java b/src/main/java/derms/net/runicast/ReliableUnicastReceiver.java
index 3d63a6f..dc69834 100644
--- a/src/main/java/derms/net/runicast/ReliableUnicastReceiver.java
+++ b/src/main/java/derms/net/runicast/ReliableUnicastReceiver.java
@@ -1,4 +1,58 @@
 package derms.net.runicast;
 
-public class ReliableUnicastReceiver {
+import derms.net.ConcurrentDatagramSocket;
+import derms.net.MessagePayload;
+import derms.util.ThreadPool;
+
+import java.io.IOException;
+import java.net.SocketAddress;
+import java.time.Duration;
+import java.util.concurrent.*;
+import java.util.logging.Logger;
+
+public class ReliableUnicastReceiver<T extends MessagePayload> {
+    private static final Duration soTimeout = Duration.ofMillis(500); // Socket timeout.
+
+    private final ConcurrentDatagramSocket sock;
+    private final BlockingQueue<T> delivered;
+    private final Logger log;
+    private final ExecutorService pool;
+
+    /**
+     * @param laddr The local IP address and port to listen on.
+     */
+    ReliableUnicastReceiver(SocketAddress laddr) throws IOException {
+        this.sock = new ConcurrentDatagramSocket(laddr);
+        this.sock.setSoTimeout(soTimeout);
+        this.delivered = new LinkedBlockingQueue<T>();
+        this.log = Logger.getLogger(getClass().getName());
+        this.pool = Executors.newCachedThreadPool();
+        pool.execute(new Receive<T>(sock, delivered));
+    }
+
+    public void close() {
+        log.info("Shutting down");
+        ThreadPool.shutDown(pool, log);
+        sock.close();
+    }
+
+    /** Receive a message, blocking if necessary until one arrives. */
+    public T receive() throws InterruptedException {
+        return delivered.take();
+    }
+
+    /** Receive a message, or return null if none are available. */
+    public T tryReceive() {
+        return delivered.poll();
+    }
+
+    /**
+     * Receive a message, waiting up to the specified wait time if necessary.
+     *
+     * @return A message, or null if the specified waiting time elapses before
+     * a message arrives.
+     */
+    public T tryReceive(Duration waitTime) throws InterruptedException {
+        return delivered.poll(waitTime.toMillis(), TimeUnit.MILLISECONDS);
+    }
 }
-- 
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