/
CacheEntryHelper.cs
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/
CacheEntryHelper.cs
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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Threading;
namespace Microsoft.Extensions.Caching.Memory
{
internal class CacheEntryHelper
{
private static readonly AsyncLocal<CacheEntryStack> _scopes = new AsyncLocal<CacheEntryStack>();
internal static CacheEntryStack Scopes
{
get { return _scopes.Value; }
set { _scopes.Value = value; }
}
internal static CacheEntry Current
{
get
{
var scopes = GetOrCreateScopes();
return scopes.Peek();
}
}
internal static IDisposable EnterScope(CacheEntry entry)
{
var scopes = GetOrCreateScopes();
var scopeLease = new ScopeLease(scopes);
Scopes = scopes.Push(entry);
return scopeLease;
}
private static CacheEntryStack GetOrCreateScopes()
{
var scopes = Scopes;
if (scopes == null)
{
scopes = CacheEntryStack.Empty;
Scopes = scopes;
}
return scopes;
}
private sealed class ScopeLease : IDisposable
{
readonly CacheEntryStack _cacheEntryStack;
public ScopeLease(CacheEntryStack cacheEntryStack)
{
_cacheEntryStack = cacheEntryStack;
}
public void Dispose()
{
Scopes = _cacheEntryStack;
}
}
}
}