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

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


#ifndef Foundation_ExpireLRUCache_INCLUDED
#define Foundation_ExpireLRUCache_INCLUDED


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


namespace Poco
{


template <class TKey, class TValue, class TMutex = FastMutex, class TEventMutex = FastMutex>
class ExpireLRUCache : public AbstractCache<TKey, TValue, StrategyCollection<TKey, TValue>, TMutex, TEventMutex>
/// An ExpireLRUCache 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:
    ExpireLRUCache(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 ExpireStrategy<TKey, TValue>(expire));
    }

    ~ExpireLRUCache() { }

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


} // namespace Poco


#endif // Foundation_ExpireLRUCache_INCLUDED