109 lines
4.0 KiB
C#
109 lines
4.0 KiB
C#
using System;
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using System.Diagnostics;
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using Microsoft.Extensions.Caching.Memory;
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namespace AppLimit.CloudComputing.SharpBox.Common.Cache
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{
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public sealed class CachedDictionary<T> : CachedDictionaryBase<T>
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{
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private readonly TimeSpan _absoluteExpirationPeriod;
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private DateTime AbsoluteExpiration
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{
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get
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{
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if (_absoluteExpirationPeriod == TimeSpan.Zero)
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return DateTime.MaxValue;
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return DateTime.Now + _absoluteExpirationPeriod;
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}
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}
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private TimeSpan SlidingExpiration { get; set; }
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private MemoryCache MemoryCache { get; set; }
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public CachedDictionary(string baseKey, TimeSpan absoluteExpirationPeriod, TimeSpan slidingExpiration, Func<T, bool> cacheCodition)
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{
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MemoryCache = new MemoryCache(new MemoryCacheOptions());
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_baseKey = baseKey;
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_absoluteExpirationPeriod = absoluteExpirationPeriod;
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SlidingExpiration = slidingExpiration;
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_cacheCodition = cacheCodition ?? throw new ArgumentNullException("cacheCodition");
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InsertRootKey(_baseKey);
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}
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public CachedDictionary(string baseKey)
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: this(baseKey, x => true)
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{
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}
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public CachedDictionary(string baseKey, Func<T, bool> cacheCodition)
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: this(baseKey, TimeSpan.Zero, TimeSpan.Zero, cacheCodition)
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{
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}
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protected override void InsertRootKey(string rootKey)
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{
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#if (DEBUG)
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Debug.Print("inserted root key {0}", rootKey);
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#endif
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MemoryCache.Remove(rootKey);
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MemoryCache.Set(rootKey, DateTime.UtcNow.Ticks, new MemoryCacheEntryOptions() { AbsoluteExpiration = DateTime.MaxValue, SlidingExpiration = TimeSpan.Zero, Priority = CacheItemPriority.NeverRemove });
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}
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public override void Reset(string rootKey, string key)
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{
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MemoryCache.Remove(BuildKey(key, rootKey));
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}
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protected override object GetObjectFromCache(string fullKey)
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{
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return MemoryCache.Get(fullKey);
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}
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public override void Add(string rootkey, string key, T newValue)
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{
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var builtrootkey = BuildKey(string.Empty, string.IsNullOrEmpty(rootkey) ? "root" : rootkey);
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if (!MemoryCache.TryGetValue(builtrootkey, out _))
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{
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#if (DEBUG)
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Debug.Print("added root key {0}", builtrootkey);
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#endif
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//Insert root if no present
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MemoryCache.Remove(builtrootkey);
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MemoryCache.Set(builtrootkey, DateTime.UtcNow.Ticks, new MemoryCacheEntryOptions
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{
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AbsoluteExpiration = AbsoluteExpiration,
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SlidingExpiration = SlidingExpiration
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});
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MemoryCache.Remove(BuildKey(key, rootkey));
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}
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if (newValue != null)
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{
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var buildKey = BuildKey(key, rootkey);
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MemoryCache.Remove(buildKey);
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var options = new MemoryCacheEntryOptions
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{
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Priority = CacheItemPriority.Normal,
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AbsoluteExpiration = AbsoluteExpiration,
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SlidingExpiration = SlidingExpiration,
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};
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MemoryCache.Set(BuildKey(key, rootkey), newValue, new MemoryCacheEntryOptions
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{
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Priority = CacheItemPriority.Normal,
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AbsoluteExpiration = AbsoluteExpiration,
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SlidingExpiration = SlidingExpiration
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});
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//TODO
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//options.AddExpirationToken(Microsoft.Extensions.Primitives.CancellationChangeToken);
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//new CacheDependency(null, new[] { _baseKey, builtrootkey }),
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}
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else
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{
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MemoryCache.Remove(BuildKey(key, rootkey)); //Remove if null
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}
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}
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}
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} |