SizeLimitedCache.cs

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// 
//  Copyright 2010-2015 Deveel
// 
//    Licensed under the Apache License, Version 2.0 (the "License");
//    you may not use this file except in compliance with the License.
//    You may obtain a copy of the License at
// 
//        http://www.apache.org/licenses/LICENSE-2.0
// 
//    Unless required by applicable law or agreed to in writing, software
//    distributed under the License is distributed on an "AS IS" BASIS,
//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//    See the License for the specific language governing permissions and
//    limitations under the License.
//

using System;

namespace Deveel.Data.Caching {
    public class SizeLimitedCache : MemoryCache {
        public SizeLimitedCache(int maxSize) {
            MaxSize = maxSize;
        }

        public int MaxSize { get; private set; }

        protected override void CheckClean() {
            // If we have reached maximum cache size, remove some elements from the
            // end of the list
            if (NodeCount >= MaxSize) {
                Clean();
            }
        }

        protected override void UpdateElementAccess(object key, CacheValue cacheValue) {
            base.UpdateElementAccess(key, cacheValue);

            while (IndexList.Count > MaxSize) {
                RemoveUnlocked(IndexList.Last.Value.Key);
            }
        }
    }
}