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CustomAttributeCache.cs
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136 lines (108 loc) · 3.91 KB
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
using System;
using System.Collections.Generic;
using System.Reflection;
using System.Runtime.CompilerServices;
using Microsoft.ClearScript.Util;
namespace Microsoft.ClearScript
{
internal sealed class CustomAttributeCache
{
private readonly ConditionalWeakTable<ICustomAttributeProvider, Entry> table = new();
public T[] GetOrLoad<T>(CustomAttributeLoader loader, ICustomAttributeProvider resource, bool inherit) where T : Attribute
{
lock (table)
{
return GetOrLoad<T>(loader, table.GetOrCreateValue(resource), resource, inherit);
}
}
private T[] GetOrLoad<T>(CustomAttributeLoader loader, Entry entry, ICustomAttributeProvider resource, bool inherit) where T : Attribute
{
if (entry.TryGet<T>(out var attrs))
{
return attrs;
}
attrs = Load<T>(GetIsBypass(entry, resource) ? CustomAttributeLoader.Default : loader, resource, inherit);
entry.Add(attrs);
return attrs;
}
private static T[] Load<T>(CustomAttributeLoader loader, ICustomAttributeProvider resource, bool inherit) where T : Attribute
{
return loader.LoadCustomAttributes<T>(resource, inherit) ?? ArrayHelpers.GetEmptyArray<T>();
}
private bool GetIsBypass(ICustomAttributeProvider resource)
{
// ReSharper disable once InconsistentlySynchronizedField
return GetIsBypass(table.GetOrCreateValue(resource), resource);
}
private bool GetIsBypass(Entry entry, ICustomAttributeProvider resource)
{
if (!entry.IsBypass.HasValue)
{
entry.IsBypass = GetIsBypassInternal(resource);
}
return entry.IsBypass.Value;
}
private bool GetIsBypassInternal(ICustomAttributeProvider resource)
{
if (Load<BypassCustomAttributeLoaderAttribute>(CustomAttributeLoader.Default, resource, false).Length > 0)
{
return true;
}
var parent = GetParent(resource);
if (parent is not null)
{
return GetIsBypass(parent);
}
return false;
}
private static ICustomAttributeProvider GetParent(ICustomAttributeProvider resource)
{
if (resource is ParameterInfo parameter)
{
return parameter.Member;
}
if (resource is Type type)
{
return (type.DeclaringType as ICustomAttributeProvider) ?? type.Module;
}
if (resource is MemberInfo member)
{
return member.DeclaringType;
}
if (resource is Module module)
{
return module.Assembly;
}
return null;
}
#region Nested type: Entry
// ReSharper disable ClassNeverInstantiated.Local
private sealed class Entry
{
private readonly Dictionary<Type, object> map = new();
public bool? IsBypass { get; set; }
public void Add<T>(T[] attrs)
{
map.Add(typeof(T), attrs);
}
public bool TryGet<T>(out T[] attrs)
{
if (map.TryGetValue(typeof(T), out var attrsObject))
{
attrs = attrsObject as T[];
return true;
}
attrs = null;
return false;
}
}
// ReSharper restore ClassNeverInstantiated.Local
#endregion
}
[AttributeUsage(AttributeTargets.All, Inherited = false)]
internal sealed class BypassCustomAttributeLoaderAttribute : Attribute
{
}
}