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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.
namespace System
{
using System;
using System.Runtime.CompilerServices;
internal static class AppContextSwitches
{
private static int _noAsyncCurrentCulture;
public static bool NoAsyncCurrentCulture
{
[MethodImpl(MethodImplOptions.AggressiveInlining)]
get
{
return GetCachedSwitchValue(AppContextDefaultValues.SwitchNoAsyncCurrentCulture, ref _noAsyncCurrentCulture);
}
}
private static int _throwExceptionIfDisposedCancellationTokenSource;
public static bool ThrowExceptionIfDisposedCancellationTokenSource
{
[MethodImpl(MethodImplOptions.AggressiveInlining)]
get
{
return GetCachedSwitchValue(AppContextDefaultValues.SwitchThrowExceptionIfDisposedCancellationTokenSource, ref _throwExceptionIfDisposedCancellationTokenSource);
}
}
private static int _preserveEventListnerObjectIdentity;
public static bool PreserveEventListnerObjectIdentity
{
[MethodImpl(MethodImplOptions.AggressiveInlining)]
get
{
return GetCachedSwitchValue(AppContextDefaultValues.SwitchPreserveEventListnerObjectIdentity, ref _preserveEventListnerObjectIdentity);
}
}
//
// Implementation details
//
private static bool DisableCaching { get; set; }
static AppContextSwitches()
{
bool isEnabled;
if (AppContext.TryGetSwitch(@"TestSwitch.LocalAppContext.DisableCaching", out isEnabled))
{
DisableCaching = isEnabled;
}
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
internal static bool GetCachedSwitchValue(string switchName, ref int switchValue)
{
if (switchValue < 0) return false;
if (switchValue > 0) return true;
return GetCachedSwitchValueInternal(switchName, ref switchValue);
}
private static bool GetCachedSwitchValueInternal(string switchName, ref int switchValue)
{
bool isSwitchEnabled;
AppContext.TryGetSwitch(switchName, out isSwitchEnabled);
if (DisableCaching)
{
return isSwitchEnabled;
}
switchValue = isSwitchEnabled ? 1 /*true*/ : -1 /*false*/;
return isSwitchEnabled;
}
}
}
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