An alternative to UBB.threads
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// Copyright (c) 2004-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as published by
// the Free Software Foundation
//
// There are special exceptions to the terms and conditions of the GPL
// as it is applied to this software. View the full text of the
// exception in file EXCEPTIONS in the directory of this software
// distribution.
//
// 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
using System;
using System.Collections.Generic;
namespace MySql.Data.Common
{
internal class Cache<KeyType, ValueType>
{
private int _capacity;
private Queue<KeyType> _keyQ;
private Dictionary<KeyType, ValueType> _contents;
public Cache(int initialCapacity, int capacity)
{
_capacity = capacity;
_contents = new Dictionary<KeyType, ValueType>(initialCapacity);
if (capacity > 0)
_keyQ = new Queue<KeyType>(initialCapacity);
}
public ValueType this[KeyType key]
{
get
{
ValueType val;
if (_contents.TryGetValue(key, out val))
return val;
else
return default(ValueType);
}
set { InternalAdd(key, value); }
}
public void Add(KeyType key, ValueType value)
{
InternalAdd(key, value);
}
private void InternalAdd(KeyType key, ValueType value)
{
if (!_contents.ContainsKey(key))
{
if (_capacity > 0)
{
_keyQ.Enqueue(key);
if (_keyQ.Count > _capacity)
_contents.Remove(_keyQ.Dequeue());
}
}
_contents[key] = value;
}
}
}