mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-19 06:01:57 +00:00
65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
//
|
|
// UniqueExpireLRUCache.h
|
|
//
|
|
// Library: Foundation
|
|
// Package: Cache
|
|
// Module: UniqueExpireLRUCache
|
|
//
|
|
// Definition of the UniqueExpireLRUCache class.
|
|
//
|
|
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
|
|
// and Contributors.
|
|
//
|
|
// SPDX-License-Identifier: BSL-1.0
|
|
//
|
|
|
|
|
|
#ifndef Foundation_UniqueExpireLRUCache_INCLUDED
|
|
#define Foundation_UniqueExpireLRUCache_INCLUDED
|
|
|
|
|
|
#include "Poco/AbstractCache.h"
|
|
#include "Poco/LRUStrategy.h"
|
|
#include "Poco/StrategyCollection.h"
|
|
#include "Poco/UniqueExpireStrategy.h"
|
|
|
|
|
|
namespace Poco
|
|
{
|
|
|
|
|
|
template <class TKey, class TValue, class TMutex = FastMutex, class TEventMutex = FastMutex>
|
|
class UniqueExpireLRUCache : public AbstractCache<TKey, TValue, StrategyCollection<TKey, TValue>, TMutex, TEventMutex>
|
|
/// A UniqueExpireLRUCache combines LRU caching and time based per entry expire caching.
|
|
/// One can define for each cache entry a separate timepoint
|
|
/// but also limit the size of the cache (per default: 1024).
|
|
/// 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.
|
|
/// Accessing an object will NOT update this absolute expire timepoint.
|
|
/// You can use the Poco::ExpirationDecorator to add the getExpiration
|
|
/// method to values that do not have a getExpiration function.
|
|
{
|
|
public:
|
|
UniqueExpireLRUCache(long cacheSize = 1024)
|
|
: AbstractCache<TKey, TValue, StrategyCollection<TKey, TValue>, TMutex, TEventMutex>(StrategyCollection<TKey, TValue>())
|
|
{
|
|
this->_strategy.pushBack(new LRUStrategy<TKey, TValue>(cacheSize));
|
|
this->_strategy.pushBack(new UniqueExpireStrategy<TKey, TValue>());
|
|
}
|
|
|
|
~UniqueExpireLRUCache() { }
|
|
|
|
private:
|
|
UniqueExpireLRUCache(const UniqueExpireLRUCache & aCache);
|
|
UniqueExpireLRUCache & operator=(const UniqueExpireLRUCache & aCache);
|
|
};
|
|
|
|
|
|
} // namespace Poco
|
|
|
|
|
|
#endif // Foundation_UniqueExpireLRUCache_INCLUDED
|