text: //
  // UniqueAccessExpireLRUCache.h
  //
  // $Id: //poco/1.3/Foundation/include/Poco/UniqueAccessExpireLRUCache.h#1 $
  //
  // Library: Foundation
  // Package: Cache
  // Module:  UniqueAccessExpireLRUCache
  //
  // Definition of the UniqueAccessExpireLRUCache 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
  // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
  // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  // DEALINGS IN THE SOFTWARE.
  //
  
  
  #ifndef  Foundation_UniqueAccessExpireLRUCache_INCLUDED
  #define  Foundation_UniqueAccessExpireLRUCache_INCLUDED
  
  
  #include "Poco/AbstractCache.h"
  #include "Poco/StrategyCollection.h"
  #include "Poco/UniqueAccessExpireStrategy.h"
  #include "Poco/LRUStrategy.h"
  
  
  namespace Poco {
  
  
  template < 
  	class TKey,
  	class TValue
  >
  class UniqueAccessExpireLRUCache: public AbstractCache<TKey, TValue, StrategyCollection<TKey, TValue> >
  	/// A UniqueAccessExpireLRUCache combines LRU caching and time based per entry expire caching.
  	/// One can define for each cache entry a seperate timepoint
  	/// but also limit the size of the cache (per default: 1024).
  	/// Each TValue object must thus offer the following method:
  	///    
  	///    const Poco::Timespan& getTimeout() const;
  	///    
  	/// which returns the relative timespan for how long the entry should be valid without being accessed!
  	/// The absolute expire timepoint is calculated as now() + getTimeout().
  	/// Accessing an object will update this absolute expire timepoint.
  	/// You can use the Poco::AccessExpirationDecorator to add the getExpiration
  	/// method to values that do not have a getExpiration function.
  {
  public:
  	UniqueAccessExpireLRUCache(long cacheSize = 1024): 
  		AbstractCache<TKey, TValue, StrategyCollection<TKey, TValue> >(StrategyCollection<TKey, TValue>())
  	{
  		this->_strategy.pushBack(new LRUStrategy<TKey, TValue>(cacheSize));
  		this->_strategy.pushBack(new UniqueAccessExpireStrategy<TKey, TValue>());
  	}
  
  	~UniqueAccessExpireLRUCache()
  	{
  	}
  
  private:
  	UniqueAccessExpireLRUCache(const UniqueAccessExpireLRUCache& aCache);
  	UniqueAccessExpireLRUCache& operator = (const UniqueAccessExpireLRUCache& aCache);
  };
  
  
  } // namespace Poco
  
  
  #endif // Foundation_UniqueAccessExpireLRUCache_INCLUDED
  