src/DotNetCommon.Core/Cache/Impl/CacheEntry.cs

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//using Microsoft.Extensions.Primitives;
//using System;
//using System.Collections.Generic;
//using System.Runtime.CompilerServices;
//using System.Text;
//using System.Threading;
//using System.Threading.Tasks;
//
//namespace DotNetCommon.Cache.Impl
//{
//    internal sealed partial class CacheEntry : ICacheEntry
//    {
//        private static readonly Action<object> ExpirationCallback = ExpirationTokensExpired;
//
//        private readonly MemoryCache _cache;
//
//        private CacheEntryTokens _tokens; // might be null if user is not using the tokens or callbacks
//        private TimeSpan? _absoluteExpirationRelativeToNow;
//        private TimeSpan? _slidingExpiration;
//        private long? _size;
//        private CacheEntry _previous; // this field is not null only before the entry is added to the cache
//        private object _value;
//        private CacheEntryState _state;
//
//        internal CacheEntry(object key, MemoryCache memoryCache)
//        {
//            Key = key ?? throw new ArgumentNullException(nameof(key));
//            _cache = memoryCache ?? throw new ArgumentNullException(nameof(memoryCache));
//            _previous = CacheEntryHelper.EnterScope(this);
//            _state = new CacheEntryState(CacheItemPriority.Normal);
//        }
//
//        /// <summary>
//        /// Gets or sets an absolute expiration date for the cache entry.
//        /// </summary>
//        public DateTimeOffset? AbsoluteExpiration { get; set; }
//
//        /// <summary>
//        /// Gets or sets an absolute expiration time, relative to now.
//        /// </summary>
//        public TimeSpan? AbsoluteExpirationRelativeToNow
//        {
//            get => _absoluteExpirationRelativeToNow;
//            set
//            {
//                // this method does not set AbsoluteExpiration as it would require calling Clock.UtcNow twice:
//                // once here and once in MemoryCache.SetEntry
//
//                if (value <= TimeSpan.Zero)
//                {
//                    throw new ArgumentOutOfRangeException(
//                        nameof(AbsoluteExpirationRelativeToNow),
//                        value,
//                        "The relative expiration value must be positive.");
//                }
//
//                _absoluteExpirationRelativeToNow = value;
//            }
//        }
//