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