82 lines
2.0 KiB
C#
82 lines
2.0 KiB
C#
// This file implements the classes UsageEntryRef and CacheUsage missing from .NET reference source
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namespace System.Runtime.Caching {
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class UsageEntryRef {
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public static UsageEntryRef INVALID = new UsageEntryRef ();
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public bool IsInvalid {
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get { return this == INVALID; }
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}
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// This is used to compare MemoryCacheEntry that have the same UtcLastUpdateUsage.
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public int DateTimeIndex {
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get; set;
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}
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}
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class CacheUsageHelper : ICacheEntryHelper
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{
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public int Compare(MemoryCacheEntry entry1, MemoryCacheEntry entry2)
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{
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var ret = DateTime.Compare (entry1.UtcLastUpdateUsage , entry2.UtcLastUpdateUsage);
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if (ret == 0)
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return entry1.UsageEntryRef.DateTimeIndex - entry2.UsageEntryRef.DateTimeIndex;
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return ret;
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}
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public DateTime GetDateTime (MemoryCacheEntry entry)
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{
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return entry.UtcLastUpdateUsage;
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}
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}
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class CacheUsage : CacheEntryCollection {
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public static TimeSpan CORRELATED_REQUEST_TIMEOUT = new TimeSpan (0, 0, 10);
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public static TimeSpan MIN_LIFETIME_FOR_USAGE = new TimeSpan (0, 0, 10);
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public static CacheUsageHelper helper = new CacheUsageHelper ();
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public DateTime prevDateTime;
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public int dateTimeIndex;
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public CacheUsage (MemoryCacheStore store)
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: base (store, helper)
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{
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}
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public new void Add (MemoryCacheEntry entry)
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{
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var now = DateTime.UtcNow;
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if (now == prevDateTime)
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dateTimeIndex++;
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else
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dateTimeIndex = 0;
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prevDateTime = now;
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entry.UtcLastUpdateUsage = now;
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entry.UsageEntryRef = new UsageEntryRef ();
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entry.UsageEntryRef.DateTimeIndex = dateTimeIndex;
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base.Add (entry);
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}
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public new void Remove (MemoryCacheEntry entry)
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{
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base.Remove (entry);
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entry.UsageEntryRef = UsageEntryRef.INVALID;
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}
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public void Update (MemoryCacheEntry entry)
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{
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base.Remove (entry);
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entry.UtcLastUpdateUsage = DateTime.UtcNow;
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base.Add (entry);
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}
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public int FlushUnderUsedItems (int count)
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{
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return base.FlushItems (DateTime.MaxValue, CacheEntryRemovedReason.Evicted, true, count);
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}
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}
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} |