//
// MemoryCacheEntryChangeMonitor.cs
//
// Authors:
// Marek Habersack <mhabersack@novell.com>
//
// Copyright (C) 2010 Novell, Inc. (http://novell.com/)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Text;
namespace System.Runtime.Caching{
sealed class MemoryCacheEntryChangeMonitor : CacheEntryChangeMonitor
{
ReadOnlyCollection <string> cacheKeys;
DateTimeOffset lastModified;
MemoryCache owner;
string uniqueId;
public override ReadOnlyCollection <string> CacheKeys {
get { return cacheKeys; }
}
public override DateTimeOffset LastModified {
get { return lastModified; }
}
public override string RegionName {
get { return null; }
}
public override string UniqueId {
get { return uniqueId; }
}
public MemoryCacheEntryChangeMonitor (MemoryCache owner, IEnumerable <string> keys)
{
this.owner = owner;
this.lastModified = DateTimeOffset.MinValue;
MemoryCacheEntry mce;
var sb = new StringBuilder ();
var list = new List <string> ();
foreach (string key in keys) {
mce = owner.GetEntry (key);
list.Add (key);
#if true
// LAMESPEC: this is what's happening
DateTimeOffset modtime;
modtime = new DateTimeOffset (mce != null ? mce.LastModified : DateTime.MinValue);
if (this.lastModified < modtime)
this.lastModified = modtime;
#else
// LAMESPEC: this is what is supposed to be happening
if (mce == null) {
OnChanged (null);
sb.Append ("{0}{1:x}", key, DateTime.MinValue.Ticks);
continue;
}
DateTime modtime = mce.LastModified;
if (this.lastModtime < modtime)
this.lastModtime = new DateTimeOffset (modtime);
#endif
sb.AppendFormat ("{0}{1:X}", key, modtime.Ticks);
}
this.uniqueId = sb.ToString ();
this.cacheKeys = new ReadOnlyCollection <string> (list);
// TODO: hook up to change events on MemoryCache
}
protected override void Dispose (bool disposing)
{
}
}
}
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