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//
// UniqueExpireCache.h
//
// $Id: //poco/1.3/Foundation/include/Poco/UniqueExpireCache.h#1 $
//
// Library: Foundation
// Package: Cache
// Module: UniqueExpireCache
//
// Definition of the UniqueExpireCache 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_UniqueExpireCache_INCLUDED
#define Foundation_UniqueExpireCache_INCLUDED
#include "Poco/AbstractCache.h"
#include "Poco/UniqueExpireStrategy.h"
namespace Poco {
template <class TKey, class TValue>
class UniqueExpireCache: public AbstractCache<TKey, TValue, UniqueExpireStrategy<TKey, TValue> >
/// An UniqueExpireCache caches entries for a given time amount. In contrast
/// to ExpireCache which only allows to set a per cache expiration value, it allows to define
/// expiration per CacheEntry.
/// Each TValue object must thus offer the following method:
///
/// const Poco::Timestamp& getExpiration() const;
///
/// which returns the absolute timepoint when the entry will be invalidated.
///
/// Be careful when using an UniqueExpireCache. A cache is often used
/// like cache.has(x) followed by cache.get x). Note that it could happen
/// that the "has" call works, then the current execution thread gets descheduled, time passes,
/// the entry gets invalid, thus leading to an empty SharedPtr being returned
/// when "get" is invoked.
{
public:
UniqueExpireCache():
AbstractCache<TKey, TValue, UniqueExpireStrategy<TKey, TValue> >(UniqueExpireStrategy<TKey, TValue>())
{
}
~UniqueExpireCache()
{
}
private:
UniqueExpireCache(const UniqueExpireCache& aCache);
UniqueExpireCache& operator = (const UniqueExpireCache& aCache);
};
} // namespace Poco
#endif
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