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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Runtime.CompilerServices;
namespace System
{
// Helper method for local caching of compatibility quirks. Keep this lean and simple - this file is included into
// every framework assembly that implements any compatibility quirks.
internal static partial class LocalAppContextSwitches
{
// Returns value of given switch using provided cache.
[MethodImpl(MethodImplOptions.AggressiveInlining)]
internal static bool GetCachedSwitchValue(string switchName, ref int cachedSwitchValue)
{
// The cached switch value has 3 states: 0 - unknown, 1 - true, -1 - false
if (cachedSwitchValue < 0) return false;
if (cachedSwitchValue > 0) return true;
return GetCachedSwitchValueInternal(switchName, ref cachedSwitchValue);
}
private static bool GetCachedSwitchValueInternal(string switchName, ref int cachedSwitchValue)
{
bool isSwitchEnabled;
bool hasSwitch = AppContext.TryGetSwitch(switchName, out isSwitchEnabled);
if (!hasSwitch)
{
isSwitchEnabled = GetSwitchDefaultValue(switchName);
}
AppContext.TryGetSwitch(@"TestSwitch.LocalAppContext.DisableCaching", out bool disableCaching);
if (!disableCaching)
{
cachedSwitchValue = isSwitchEnabled ? 1 /*true*/ : -1 /*false*/;
}
return isSwitchEnabled;
}
// Provides default values for switches if they're not always false by default
private static bool GetSwitchDefaultValue(string switchName)
{
if (switchName == "Switch.System.Runtime.Serialization.SerializationGuard")
{
return true;
}
return false;
}
}
}
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