baseline: OpenMU upstream b5a0961 (fresh source)

src/GameLogic/IObservable.cs

@@ -0,0 +1,35 @@
+// <copyright file="IObservable.cs" company="MUnique">
+// Licensed under the MIT License. See LICENSE file in the project root for full license information.
+// </copyright>
+
+namespace MUnique.OpenMU.GameLogic;
+
+using Nito.AsyncEx;
+
+/// <summary>
+/// Interface for an observable object.
+/// </summary>
+public interface IObservable
+{
+    /// <summary>
+    /// Gets the observers.
+    /// </summary>
+    ISet<IWorldObserver> Observers { get; }
+
+    /// <summary>
+    /// Gets the lock for <see cref="Observers"/>.
+    /// </summary>
+    AsyncReaderWriterLock ObserverLock { get; }
+
+    /// <summary>
+    /// Adds the observer.
+    /// </summary>
+    /// <param name="observer">The observer.</param>
+    ValueTask AddObserverAsync(IWorldObserver observer);
+
+    /// <summary>
+    /// Removes the observer.
+    /// </summary>
+    /// <param name="observer">The observer.</param>
+    ValueTask RemoveObserverAsync(IWorldObserver observer);
+}