Esempio n. 1
0
        public bool SetValue(TKey key, TValue value, DateTime expirationTime)
        {
            if (key == null)
            {
                throw LogHelper.LogArgumentNullException(nameof(key));
            }

            if (value == null)
            {
                throw LogHelper.LogArgumentNullException(nameof(value));
            }

            // if item already expired, do not add it to the cache if the _removeExpiredValues setting is set to true
            if (_removeExpiredValues && expirationTime < DateTime.UtcNow)
            {
                return(false);
            }

            // just need to update value and move it to the top
            if (_map.TryGetValue(key, out var cacheItem))
            {
                cacheItem.Value          = value;
                cacheItem.ExpirationTime = expirationTime;
                _eventQueue.Add(() =>
                {
                    _doubleLinkedList.Remove(cacheItem);
                    _doubleLinkedList.AddFirst(cacheItem);
                });
            }
            else
            {
                // if cache is at _maxCapacityPercentage, trim it by _compactionPercentage
                if ((double)_map.Count / _capacity >= _maxCapacityPercentage)
                {
                    _eventQueue.Add(() =>
                    {
                        RemoveLRUs();
                    });
                }
                // add the new node
                var newCacheItem = new LRUCacheItem <TKey, TValue>(key, value, expirationTime);
                _eventQueue.Add(() =>
                {
                    // Add a remove operation in case two threads are trying to add the same value. Only the second remove will succeed in this case.
                    _doubleLinkedList.Remove(newCacheItem);
                    _doubleLinkedList.AddFirst(newCacheItem);
                });
                _map[key] = newCacheItem;
            }

            return(true);
        }
Esempio n. 2
0
        public override bool Equals(object obj)
        {
            LRUCacheItem <TKey, TValue> item = obj as LRUCacheItem <TKey, TValue>;

            return(item != null && Key.Equals(item.Key));
        }