expirelrucache.h

C++ class libraries for network-centric, portable applications, integrated perfectly with the C++ St

//
// ExpireLRUCache.h
//
// $Id: //poco/1.2/Foundation/include/Poco/ExpireLRUCache.h#4 $
//
// Library: Foundation
// Package: Cache
// Module:  ExpireLRUCache
//
// Definition of the ExpireLRUCache class.
//
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// DEALINGS IN THE SOFTWARE.
//


#ifndef  Foundation_ExpireLRUCache_INCLUDED
#define  Foundation_ExpireLRUCache_INCLUDED


#include "Poco/AbstractCache.h"
#include "Poco/StrategyCollection.h"
#include "Poco/ExpireStrategy.h"
#include "Poco/LRUStrategy.h"


namespace Poco {


template < 
	class TKey,
	class TValue
>
class ExpireLRUCache: public AbstractCache<TKey, TValue, StrategyCollection<TKey, TValue> >
	/// An ExpireLRUCache combines LRU caching and time based expire caching.
	/// It cache entries for a fixed time period (per default 10 minutes)
	/// but also limits the size of the cache (per default: 1024).
{
public:
	ExpireLRUCache(long cacheSize = 1024, Timestamp::TimeDiff expire = 600000): 
		AbstractCache<TKey, TValue, StrategyCollection<TKey, TValue> >(StrategyCollection<TKey, TValue>())
	{
		this->_strategy.pushBack(new LRUStrategy<TKey, TValue>(cacheSize));
		this->_strategy.pushBack(new ExpireStrategy<TKey, TValue>(expire));
	}

	~ExpireLRUCache()
	{
	}

private:
	ExpireLRUCache(const ExpireLRUCache& aCache);
	ExpireLRUCache& operator = (const ExpireLRUCache& aCache);
};


} // namespace Poco


#endif