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100 lines
3.3 KiB
C++
100 lines
3.3 KiB
C++
//
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// AbstractStrategy.h
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//
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// $Id: //poco/1.4/Foundation/include/Poco/AbstractStrategy.h#1 $
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//
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// Library: Foundation
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// Package: Cache
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// Module: AbstractCache
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//
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// Definition of the AbstractStrategy class.
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//
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// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#ifndef Foundation_AbstractStrategy_INCLUDED
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#define Foundation_AbstractStrategy_INCLUDED
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#include "Poco/KeyValueArgs.h"
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#include "Poco/ValidArgs.h"
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#include "Poco/EventArgs.h"
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#include <set>
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namespace Poco {
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template <class TKey, class TValue>
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class AbstractStrategy
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/// An AbstractStrategy is the interface for all strategies.
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{
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public:
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AbstractStrategy()
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{
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}
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virtual ~AbstractStrategy()
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{
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}
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virtual void onUpdate(const void* pSender, const KeyValueArgs <TKey, TValue>& args)
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/// Updates an existing entry.
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{
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onRemove(pSender,args.key());
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onAdd(pSender, args);
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}
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virtual void onAdd(const void* pSender, const KeyValueArgs <TKey, TValue>& key) = 0;
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/// Adds the key to the strategy.
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/// If for the key already an entry exists, an exception will be thrown.
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virtual void onRemove(const void* pSender, const TKey& key) = 0;
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/// Removes an entry from the strategy. If the entry is not found
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/// the remove is ignored.
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virtual void onGet(const void* pSender, const TKey& key) = 0;
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/// Informs the strategy that a read-access happens to an element.
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virtual void onClear(const void* pSender, const EventArgs& args) = 0;
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/// Removes all elements from the cache.
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virtual void onIsValid(const void* pSender, ValidArgs<TKey>& key) = 0;
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/// Used to query if a key is still valid (i.e. cached).
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virtual void onReplace(const void* pSender, std::set<TKey>& elemsToRemove) = 0;
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/// Used by the Strategy to indicate which elements should be removed from
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/// the cache. Note that onReplace does not change the current list of keys.
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/// The cache object is reponsible to remove the elements.
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};
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} // namespace Poco
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#endif // Foundation_AbstractStrategy_INCLUDED
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