ClearScript/ClearScript/CustomAttributes.cs at master · ibcla/ClearScript · GitHub

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// Licensed under the MIT license.

using System;

using System.Collections.Concurrent;

using System.Reflection;

using System.Runtime.CompilerServices;

using Microsoft.ClearScript.Util;

namespace Microsoft.ClearScript

{

internal static partial class CustomAttributes

{

private static readonly ConcurrentDictionary<(ICustomAttributeProvider, Type), object> keyCache = new ConcurrentDictionary<(ICustomAttributeProvider, Type), object>();

private static readonly ConditionalWeakTable<object, object> attributeCache = new ConditionalWeakTable<object, object>();

public static T[] GetOrLoad<T>(ICustomAttributeProvider resource, bool inherit) where T : Attribute

{

return (T[])attributeCache.GetValue(GetKey<T>(resource), _ => HostSettings.CustomAttributeLoader.LoadCustomAttributes<T>(resource, inherit) ?? ArrayHelpers.GetEmptyArray<T>());

}

public static bool Has<T>(ICustomAttributeProvider resource, bool inherit) where T : Attribute

{

return GetOrLoad<T>(resource, inherit).Length > 0;

}

private static object GetKey<T>(ICustomAttributeProvider resource) where T : Attribute

{

return keyCache.GetOrAdd((resource, typeof(T)), _ => new object());

}

ClearScript/ClearScript/CustomAttributes.cs at master · ibcla/ClearScript · GitHub

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