Engine.Core/Systems/Abstract/IEnterUniverse.cs

@@ -0,0 +1,6 @@
+namespace Syntriax.Engine.Core;
+
+public interface IEnterUniverse : IBehaviour
+{
+    void EnterUniverse(IUniverse universe);
+}

Engine.Core/Systems/Abstract/IExitUniverse.cs

@@ -0,0 +1,6 @@
+namespace Syntriax.Engine.Core;
+
+public interface IExitUniverse : IBehaviour
+{
+    void ExitUniverse(IUniverse universe);
+}

Engine.Core/Systems/UniverseEntranceManager.cs

@@ -0,0 +1,71 @@
+using System.Collections.Generic;
+
+namespace Syntriax.Engine.Core;
+
+public class UniverseEntranceManager : Behaviour
+{
+    // We use Ascending order because we are using reverse for loop to call them
+    private static Comparer<IBehaviour> SortByAscendingPriority() => Comparer<IBehaviour>.Create((x, y) => x.Priority.CompareTo(y.Priority));
+
+    private readonly ActiveBehaviourCollectorSorted<IEnterUniverse> enterUniverses = new() { SortBy = SortByAscendingPriority() };
+    private readonly ActiveBehaviourCollectorSorted<IExitUniverse> exitUniverses = new() { SortBy = SortByAscendingPriority() };
+
+    private readonly List<IEnterUniverse> toCallEnterUniverses = new(32);
+    private readonly List<IExitUniverse> toCallExitUniverses = new(32);
+
+    protected override void OnEnteredUniverse(IUniverse universe)
+    {
+        enterUniverses.Assign(universe);
+
+        foreach (IUniverseObject universeObject in Universe.UniverseObjects)
+            OnUniverseObjectRegistered(Universe, new(universeObject));
+
+        universe.OnUniverseObjectRegistered.AddListener(OnUniverseObjectRegistered);
+        universe.OnUniverseObjectUnRegistered.AddListener(OnUniverseObjectUnRegistered);
+    }
+
+    protected override void OnExitedUniverse(IUniverse universe)
+    {
+        enterUniverses.Unassign();
+
+        foreach (IUniverseObject universeObject in Universe.UniverseObjects)
+            OnUniverseObjectUnRegistered(Universe, new(universeObject));
+
+        universe.OnUniverseObjectRegistered.RemoveListener(OnUniverseObjectRegistered);
+        universe.OnUniverseObjectUnRegistered.RemoveListener(OnUniverseObjectUnRegistered);
+    }
+
+    private void OnUniverseObjectUnRegistered(IUniverse sender, IUniverse.UniverseObjectUnRegisteredArguments args)
+    {
+        for (int i = toCallExitUniverses.Count - 1; i >= 0; i--)
+        {
+            toCallExitUniverses[i].ExitUniverse(Universe);
+            toCallExitUniverses.RemoveAt(i);
+        }
+    }
+
+    private void OnUniverseObjectRegistered(IUniverse sender, IUniverse.UniverseObjectRegisteredArguments args)
+    {
+        for (int i = toCallEnterUniverses.Count - 1; i >= 0; i--)
+        {
+            toCallEnterUniverses[i].EnterUniverse(Universe);
+            toCallEnterUniverses.RemoveAt(i);
+        }
+    }
+
+    private void OnEnterUniverseCollected(IBehaviourCollector<IEnterUniverse> sender, IBehaviourCollector<IEnterUniverse>.BehaviourCollectedArguments args)
+    {
+        toCallEnterUniverses.Add(args.BehaviourCollected);
+    }
+
+    private void OnExitUniverseCollected(IBehaviourCollector<IExitUniverse> sender, IBehaviourCollector<IExitUniverse>.BehaviourCollectedArguments args)
+    {
+        toCallExitUniverses.Add(args.BehaviourCollected);
+    }
+
+    public UniverseEntranceManager()
+    {
+        enterUniverses.OnCollected.AddListener(OnEnterUniverseCollected);
+        exitUniverses.OnCollected.AddListener(OnExitUniverseCollected);
+    }
+}