mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-15 02:41:59 +00:00
75 lines
2.0 KiB
C++
75 lines
2.0 KiB
C++
//
|
|
// AbstractStrategy.h
|
|
//
|
|
// Library: Foundation
|
|
// Package: Cache
|
|
// Module: AbstractCache
|
|
//
|
|
// Definition of the AbstractStrategy class.
|
|
//
|
|
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
|
|
// and Contributors.
|
|
//
|
|
// SPDX-License-Identifier: BSL-1.0
|
|
//
|
|
|
|
|
|
#ifndef Foundation_AbstractStrategy_INCLUDED
|
|
#define Foundation_AbstractStrategy_INCLUDED
|
|
|
|
|
|
#include <set>
|
|
#include "Poco/EventArgs.h"
|
|
#include "Poco/KeyValueArgs.h"
|
|
#include "Poco/ValidArgs.h"
|
|
|
|
|
|
namespace Poco
|
|
{
|
|
|
|
|
|
template <class TKey, class TValue>
|
|
class AbstractStrategy
|
|
/// An AbstractStrategy is the interface for all strategies.
|
|
{
|
|
public:
|
|
AbstractStrategy() { }
|
|
|
|
virtual ~AbstractStrategy() { }
|
|
|
|
virtual void onUpdate(const void * pSender, const KeyValueArgs<TKey, TValue> & args)
|
|
/// Updates an existing entry.
|
|
{
|
|
onRemove(pSender, args.key());
|
|
onAdd(pSender, args);
|
|
}
|
|
|
|
virtual void onAdd(const void * pSender, const KeyValueArgs<TKey, TValue> & key) = 0;
|
|
/// Adds the key to the strategy.
|
|
/// If for the key already an entry exists, an exception will be thrown.
|
|
|
|
virtual void onRemove(const void * pSender, const TKey & key) = 0;
|
|
/// Removes an entry from the strategy. If the entry is not found
|
|
/// the remove is ignored.
|
|
|
|
virtual void onGet(const void * pSender, const TKey & key) = 0;
|
|
/// Informs the strategy that a read-access happens to an element.
|
|
|
|
virtual void onClear(const void * pSender, const EventArgs & args) = 0;
|
|
/// Removes all elements from the cache.
|
|
|
|
virtual void onIsValid(const void * pSender, ValidArgs<TKey> & key) = 0;
|
|
/// Used to query if a key is still valid (i.e. cached).
|
|
|
|
virtual void onReplace(const void * pSender, std::set<TKey> & elemsToRemove) = 0;
|
|
/// Used by the Strategy to indicate which elements should be removed from
|
|
/// the cache. Note that onReplace does not change the current list of keys.
|
|
/// The cache object is responsible to remove the elements.
|
|
};
|
|
|
|
|
|
} // namespace Poco
|
|
|
|
|
|
#endif // Foundation_AbstractStrategy_INCLUDED
|