ClickHouse/base/poco/Foundation/include/Poco/AccessExpireLRUCache.h

//
// AccessExpireLRUCache.h
//
// Library: Foundation
// Package: Cache
// Module:  AccessExpireLRUCache
//
// Definition of the AccessExpireLRUCache class.
//
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef Foundation_AccessExpireLRUCache_INCLUDED
#define Foundation_AccessExpireLRUCache_INCLUDED


#include "Poco/AbstractCache.h"
#include "Poco/AccessExpireStrategy.h"
#include "Poco/LRUStrategy.h"
#include "Poco/StrategyCollection.h"


namespace Poco
{


template <class TKey, class TValue, class TMutex = FastMutex, class TEventMutex = FastMutex>
class AccessExpireLRUCache : public AbstractCache<TKey, TValue, StrategyCollection<TKey, TValue>, TMutex, TEventMutex>
/// An AccessExpireLRUCache combines LRU caching and time based expire caching.
/// It cache entries for a fixed time period (per default 10 minutes)
/// but also limits the size of the cache (per default: 1024).
{
public:
    AccessExpireLRUCache(long cacheSize = 1024, Timestamp::TimeDiff expire = 600000)
        : AbstractCache<TKey, TValue, StrategyCollection<TKey, TValue>, TMutex, TEventMutex>(StrategyCollection<TKey, TValue>())
    {
        this->_strategy.pushBack(new LRUStrategy<TKey, TValue>(cacheSize));
        this->_strategy.pushBack(new AccessExpireStrategy<TKey, TValue>(expire));
    }

    ~AccessExpireLRUCache() { }

private:
    AccessExpireLRUCache(const AccessExpireLRUCache & aCache);
    AccessExpireLRUCache & operator=(const AccessExpireLRUCache & aCache);
};


} // namespace Poco


#endif // Foundation_AccessExpireLRUCache_INCLUDED