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94 lines
3.2 KiB
C#
94 lines
3.2 KiB
C#
// Animancer // Copyright 2020 Kybernetik //
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//#define LOG_STRING_CACHE
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using System;
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using System.Collections.Generic;
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using UnityEngine;
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namespace Animancer.Editor
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{
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/// <summary>
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/// A simple system for converting objects and storing the results so they can be reused to minimise the need for
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/// garbage collection, particularly for string construction.
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/// </summary>
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public sealed class ConversionCache<TKey, TValue>
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{
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/************************************************************************************************************************/
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private sealed class CachedValue
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{
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public int lastFrameAccessed;
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public TValue value;
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}
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/************************************************************************************************************************/
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private readonly Dictionary<TKey, CachedValue>
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Cache = new Dictionary<TKey, CachedValue>();
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private readonly List<TKey>
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Keys = new List<TKey>();
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private readonly Func<TKey, TValue>
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ConvertToValue;
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private int _LastCleanupFrame;
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/************************************************************************************************************************/
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/// <summary>
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/// Creates a new <see cref="ConversionCache{TKey, TValue}"/> which uses the specified delegate to convert values.
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/// </summary>
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public ConversionCache(Func<TKey, TValue> convertToValue)
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{
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ConvertToValue = convertToValue;
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}
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/************************************************************************************************************************/
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/// <summary>
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/// If a value has already been cached for the specified `key`, return it. Otherwise create a new one using
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/// the delegate provided in the constructor and cache it.
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/// <para></para>
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/// This method also periodically removes values that have not been used recently.
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/// </summary>
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public TValue Convert(TKey key)
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{
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CachedValue cached;
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// The next time a value is retrieved after at least 100 frames, clear out any old ones.
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var frame = Time.frameCount;
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if (_LastCleanupFrame + 100 < frame)
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{
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for (int i = Keys.Count - 1; i >= 0; i--)
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{
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var checkKey = Keys[i];
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if (!Cache.TryGetValue(checkKey, out cached) ||
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cached.lastFrameAccessed <= _LastCleanupFrame)
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{
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Cache.Remove(checkKey);
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Keys.RemoveAt(i);
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}
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}
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_LastCleanupFrame = frame;
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}
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if (!Cache.TryGetValue(key, out cached))
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{
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Cache.Add(key, cached = new CachedValue { value = ConvertToValue(key) });
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Keys.Add(key);
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}
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cached.lastFrameAccessed = frame;
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return cached.value;
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}
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/************************************************************************************************************************/
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}
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}
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