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using System;
using System.Collections.Generic;
namespace StardewModdingAPI.Framework.Utilities
{
/// <summary>An in-memory dictionary cache that stores data for the duration of a game update tick.</summary>
/// <typeparam name="TKey">The dictionary key type.</typeparam>
/// <typeparam name="TValue">The dictionary value type.</typeparam>
internal class TickCacheDictionary<TKey, TValue>
where TKey : notnull
{
/*********
** Fields
*********/
/// <summary>The last game tick for which data was cached.</summary>
private uint? LastGameTick;
/// <summary>The underlying cached data.</summary>
private readonly Dictionary<TKey, TValue> Cache = new();
/*********
** Public methods
*********/
/// <summary>Get a value from the cache, fetching it first if it's not cached yet.</summary>
/// <param name="cacheKey">The unique key for the cached value.</param>
/// <param name="get">Get the latest data if it's not in the cache yet.</param>
public TValue GetOrSet(TKey cacheKey, Func<TValue> get)
{
// clear cache on new tick
if (SCore.ProcessTicksElapsed != this.LastGameTick)
{
this.Cache.Clear();
this.LastGameTick = SCore.ProcessTicksElapsed;
}
// fetch value
if (!this.Cache.TryGetValue(cacheKey, out TValue? cached))
this.Cache[cacheKey] = cached = get();
return cached;
}
/// <summary>Remove an entry from the cache.</summary>
/// <param name="cacheKey">The unique key for the cached value.</param>
/// <returns>Returns whether the key was present in the dictionary.</returns>
public bool Remove(TKey cacheKey)
{
return this.Cache.Remove(cacheKey);
}
}
}
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