riversong code showcase

Source/Riversong/Game/CommonServices/Signals/ISignalBus.cs

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+using System;
+
+namespace DanieleMarotta.RiversongCodeShowcase
+{
+    public interface ISignalBus
+    {
+        void Raise<T>(T signal);
+
+        void Subscribe<T>(Action<T> handler);
+
+        void Unsubscribe<T>(Action<T> handler);
+    }
+}

Source/Riversong/Game/CommonServices/Signals/SignalBus.cs

@@ -0,0 +1,31 @@
+using System;
+
+namespace DanieleMarotta.RiversongCodeShowcase
+{
+    public class SignalBus : ISignalBus, IDisposable
+    {
+        private readonly ListMultiDictionary<Type, Delegate> _subscribers = new();
+
+        public void Dispose()
+        {
+            _subscribers.Clear();
+        }
+
+        public void Raise<T>(T signal)
+        {
+            if (!_subscribers.TryGetValues(typeof(T), out var handlers)) return;
+
+            foreach (var handler in handlers) ((Action<T>)handler).Invoke(signal);
+        }
+
+        public void Subscribe<T>(Action<T> handler)
+        {
+            _subscribers.Add(typeof(T), handler);
+        }
+
+        public void Unsubscribe<T>(Action<T> handler)
+        {
+            _subscribers.Remove(typeof(T), handler);
+        }
+    }
+}