#if MYSQL_6_10 // Copyright ?2004, 2016 Oracle and/or its affiliates. All rights reserved. // // MySQL Connector/NET is licensed under the terms of the GPLv2 // <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most // MySQL Connectors. There are special exceptions to the terms and // conditions of the GPLv2 as it is applied to this software, see the // FLOSS License Exception // <http://www.mysql.com/about/legal/licensing/foss-exception.html>. // // This program is free software; you can redistribute it and/or modify // it under the terms of the GNU General Public License as published // by the Free Software Foundation; version 2 of the License. // // This program is distributed in the hope that it will be useful, but // WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY // or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License // for more details. // // You should have received a copy of the GNU General Public License along // with this program; if not, write to the Free Software Foundation, Inc., // 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA using System.Collections.Generic; namespace Externals.MySql.Data.Common { internal class Cache<TKeyType, TValueType> { private readonly int _capacity; private readonly Queue<TKeyType> _keyQ; private readonly Dictionary<TKeyType, TValueType> _contents; public Cache(int initialCapacity, int capacity) { _capacity = capacity; _contents = new Dictionary<TKeyType, TValueType>(initialCapacity); if (capacity > 0) _keyQ = new Queue<TKeyType>(initialCapacity); } public TValueType this[TKeyType key] { get { TValueType val; if (_contents.TryGetValue(key, out val)) return val; else return default(TValueType); } set { InternalAdd(key, value); } } public void Add(TKeyType key, TValueType value) { InternalAdd(key, value); } private void InternalAdd(TKeyType key, TValueType value) { if (!_contents.ContainsKey(key)) { if (_capacity > 0) { _keyQ.Enqueue(key); if (_keyQ.Count > _capacity) _contents.Remove(_keyQ.Dequeue()); } } _contents[key] = value; } } } #endif