39 lines
1.4 KiB
C#
39 lines
1.4 KiB
C#
// Copyright (c) All contributors. All rights reserved.
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// Licensed under the MIT license. See LICENSE file in the project root for full license information.
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#nullable enable
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using MessagePack.Formatters;
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using MessagePack.Internal;
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namespace MessagePack.Resolvers
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{
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/// <summary>
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/// A base class for <see cref="IFormatterResolver"/> classes that want to cache their responses for perf reasons.
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/// </summary>
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internal abstract class CachingFormatterResolver : IFormatterResolver
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{
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/// <summary>
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/// The cache of types to their formatters.
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/// </summary>
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private readonly ThreadsafeTypeKeyHashTable<IMessagePackFormatter?> formatters = new();
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/// <inheritdoc />
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public IMessagePackFormatter<T>? GetFormatter<T>()
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{
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if (!this.formatters.TryGetValue(typeof(T), out IMessagePackFormatter? formatter))
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{
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formatter = this.GetFormatterCore<T>();
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this.formatters.TryAdd(typeof(T), formatter);
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}
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return (IMessagePackFormatter<T>?)formatter;
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}
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/// <summary>
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/// Looks up a formatter for a type that has not been previously cached.
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/// </summary>
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/// <typeparam name="T">The type to be formatted.</typeparam>
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/// <returns>The formatter to use, or <see langword="null"/> if none found.</returns>
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protected abstract IMessagePackFormatter<T>? GetFormatterCore<T>();
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}
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}
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