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83 lines
2.3 KiB
83 lines
2.3 KiB
#if MYSQL_6_9
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// Copyright (c) 2004-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
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//
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// MySQL Connector/NET is licensed under the terms of the GPLv2
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// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most
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// MySQL Connectors. There are special exceptions to the terms and
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// conditions of the GPLv2 as it is applied to this software, see the
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// FLOSS License Exception
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// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published
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// by the Free Software Foundation; version 2 of the License.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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using System;
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using System.Collections.Generic;
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namespace Externals.MySql.Data.Common
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{
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internal class Cache<KeyType, ValueType>
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{
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private int _capacity;
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private Queue<KeyType> _keyQ;
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private Dictionary<KeyType, ValueType> _contents;
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public Cache(int initialCapacity, int capacity)
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{
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_capacity = capacity;
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_contents = new Dictionary<KeyType, ValueType>(initialCapacity);
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if (capacity > 0)
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_keyQ = new Queue<KeyType>(initialCapacity);
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}
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public ValueType this[KeyType key]
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{
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get
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{
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ValueType val;
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if (_contents.TryGetValue(key, out val))
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return val;
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else
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return default(ValueType);
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}
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set { InternalAdd(key, value); }
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}
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public void Add(KeyType key, ValueType value)
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{
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InternalAdd(key, value);
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}
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private void InternalAdd(KeyType key, ValueType value)
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{
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if (!_contents.ContainsKey(key))
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{
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if (_capacity > 0)
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{
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_keyQ.Enqueue(key);
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if (_keyQ.Count > _capacity)
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_contents.Remove(_keyQ.Dequeue());
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}
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}
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_contents[key] = value;
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}
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}
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}
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#endif
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