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//
// CacheEntryCollection.cs
//
// Authors:
// Marcos Henrih (marcos.henrich@xamarin.com)
//
// Copyright 2014 Xamarin, Inc (http://www.xamarin.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.Collections;
using System.Collections.Generic;
using System.Timers;
namespace System.Runtime.Caching
{
interface ICacheEntryHelper : IComparer<MemoryCacheEntry>
{
DateTime GetDateTime (MemoryCacheEntry entry);
}
class CacheEntryCollection
{
protected MemoryCacheStore store;
private ICacheEntryHelper helper;
private SortedSet <MemoryCacheEntry> entries;
protected CacheEntryCollection (MemoryCacheStore store, ICacheEntryHelper helper)
{
this.store = store;
this.helper = helper;
entries = new SortedSet <MemoryCacheEntry> (helper);
}
protected void Add (MemoryCacheEntry entry)
{
lock (entries) {
entries.Add (entry);
}
}
protected void Remove (MemoryCacheEntry entry)
{
lock (entries) {
entries.Remove (entry);
}
}
protected int FlushItems (DateTime limit, CacheEntryRemovedReason reason, bool blockInsert, int count = int.MaxValue)
{
var flushedItems = 0;
if (blockInsert)
store.BlockInsert ();
lock (entries) {
foreach (var entry in entries) {
if (helper.GetDateTime (entry) > limit || flushedItems >= count)
break;
flushedItems++;
}
for (var f = 0; f < flushedItems; f++)
store.Remove (entries.Min, null, reason);
}
if (blockInsert)
store.UnblockInsert ();
return flushedItems;
}
}
}
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