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Assets/Oculus/VR/Scripts/Util/OVRObjectPool.cs

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+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ * All rights reserved.
+ *
+ * Licensed under the Oculus SDK License Agreement (the "License");
+ * you may not use the Oculus SDK except in compliance with the License,
+ * which is provided at the time of installation or download, or which
+ * otherwise accompanies this software in either electronic or hard copy form.
+ *
+ * You may obtain a copy of the License at
+ *
+ * https://developer.oculus.com/licenses/oculussdk/
+ *
+ * Unless required by applicable law or agreed to in writing, the Oculus SDK
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+/// <summary>
+/// Helper class to handle generic class object pools and avoid allocations in the SDK that would lead to garbage collection.
+/// </summary>
+internal static class OVRObjectPool
+{
+    private static class Storage<T> where T : class, new()
+    {
+        public static readonly HashSet<T> HashSet = new HashSet<T>();
+    }
+
+    /// <summary>
+    /// Gets an object of type T from it's respective pool. If none is available a new one is created.
+    /// </summary>
+    /// <returns>Object of type T</returns>
+    public static T Get<T>() where T : class, new()
+    {
+        using var enumerator = Storage<T>.HashSet.GetEnumerator();
+        if (!enumerator.MoveNext()) return new T();
+        var item = enumerator.Current;
+        Storage<T>.HashSet.Remove(item);
+
+        if (item is IList list) list.Clear();
+        else if (item is IDictionary dict) dict.Clear();
+
+        return item;
+    }
+
+    public static List<T> List<T>() => Get<List<T>>();
+
+    public static Dictionary<TKey, TValue> Dictionary<TKey, TValue>() => Get<Dictionary<TKey, TValue>>();
+
+    public static HashSet<T> HashSet<T>()
+    {
+        var item = Get<HashSet<T>>();
+        item.Clear();
+        return item;
+    }
+
+    public static Stack<T> Stack<T>()
+    {
+        var item = Get<Stack<T>>();
+        item.Clear();
+        return item;
+    }
+
+    public static Queue<T> Queue<T>()
+    {
+        var item = Get<Queue<T>>();
+        item.Clear();
+        return item;
+    }
+
+    /// <summary>
+    /// Returns an object of type T to it's respective pool. If the object is null or already present in the pool no changes are made.
+    /// </summary>
+    /// <remarks>
+    /// After returning an object to the object pool using it is not allowed and leads to undefined behaviour, please <see cref="Get{T}"/> another object from the pool instead.
+    /// </remarks>
+    public static void Return<T>(T obj) where T : class, new()
+    {
+        switch (obj)
+        {
+            case null: return;
+            case IList list:
+                list.Clear();
+                break;
+            case IDictionary dict:
+                dict.Clear();
+                break;
+        }
+
+        Storage<T>.HashSet.Add(obj);
+    }
+
+    public static void Return<T>(HashSet<T> set)
+    {
+        set?.Clear();
+        Return<HashSet<T>>(set);
+    }
+
+    public static void Return<T>(Stack<T> stack)
+    {
+        stack?.Clear();
+        Return<Stack<T>>(stack);
+    }
+
+    public static void Return<T>(Queue<T> queue)
+    {
+        queue?.Clear();
+        Return<Queue<T>>(queue);
+    }
+
+    public struct ListScope<T> : IDisposable
+    {
+        List<T> _list;
+        public ListScope(out List<T> list) => _list = list = List<T>();
+        public void Dispose() => Return(_list);
+    }
+
+    public readonly struct DictionaryScope<TKey, TValue> : IDisposable
+    {
+        readonly Dictionary<TKey, TValue> _dictionary;
+
+        public DictionaryScope(out Dictionary<TKey, TValue> dictionary)
+            => _dictionary = dictionary = Dictionary<TKey, TValue>();
+
+        public void Dispose() => Return(_dictionary);
+    }
+
+    public readonly struct HashSetScope<T> : IDisposable
+    {
+        readonly HashSet<T> _set;
+        public HashSetScope(out HashSet<T> set) => _set = set = HashSet<T>();
+        public void Dispose() => Return(_set);
+    }
+
+    public readonly struct StackScope<T> : IDisposable
+    {
+        readonly Stack<T> _stack;
+        public StackScope(out Stack<T> stack) => _stack = stack = Stack<T>();
+        public void Dispose() => Return(_stack);
+    }
+
+    public readonly struct QueueScope<T> : IDisposable
+    {
+        readonly Queue<T> _queue;
+        public QueueScope(out Queue<T> queue) => _queue = queue = Queue<T>();
+        public void Dispose() => Return(_queue);
+    }
+
+    public readonly struct ItemScope<T> : IDisposable where T : class, new()
+    {
+        readonly T _item;
+        public ItemScope(out T item) => _item = item = Get<T>();
+        public void Dispose() => Return(_item);
+    }
+
+}