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/****************************************************************************
**
** https://www.qxorm.com/
** Copyright (C) 2013 Lionel Marty (contact@qxorm.com)
**
** This file is part of the QxOrm library
**
** This software is provided 'as-is', without any express or implied
** warranty. In no event will the authors be held liable for any
** damages arising from the use of this software
**
** Commercial Usage
** Licensees holding valid commercial QxOrm licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Lionel Marty
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file 'license.gpl3.txt' included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met : http://www.gnu.org/copyleft/gpl.html
**
** If you are unsure which license is appropriate for your use, or
** if you have questions regarding the use of this file, please contact :
** contact@qxorm.com
**
****************************************************************************/
#ifndef _QX_CACHE_H_
#define _QX_CACHE_H_
#ifdef _MSC_VER
#pragma once
#endif
/*!
* \file QxCache.h
* \author Lionel Marty
* \ingroup QxCache
* \brief qx::cache : based on singleton pattern, provide basic thread-safe cache feature to backup and restore any kind of objects (for example, object fetched from database)
*/
#include <QxCommon/QxBool.h>
#include <QxCommon/QxAny.h>
#include <QxCollection/QxCollection.h>
#include <QxSingleton/QxSingleton.h>
namespace qx {
namespace cache {
namespace detail {
class QX_DLL_EXPORT QxCache : public qx::QxSingleton<QxCache>
{
friend class qx::QxSingleton<QxCache>;
protected:
typedef std::tuple<long, QDateTime, qx::any> type_qx_cache;
typedef qx::QxCollection<QString, type_qx_cache> type_qx_lst_cache;
type_qx_lst_cache m_cache; //!< List of objects in cache under qx::any format
QMutex m_oMutexCache; //!< Mutex => 'QxCache' is thread-safe
long m_lMaxCost; //!< Max cost before deleting object in cache
long m_lCurrCost; //!< Current cost in cache
public:
QxCache();
virtual ~QxCache();
long getCurrCost() const;
long getMaxCost() const;
void setMaxCost(long l);
long count() const;
long size() const;
bool isEmpty() const;
bool exist(const QString & sKey) const;
bool contains(const QString & sKey) const;
qx::any at(const QString & sKey);
long insertionCost(const QString & sKey);
QDateTime insertionDateTime(const QString & sKey);
void clear();
bool insert(const QString & sKey, const qx::any & anyObj, long lCost = 1, const QDateTime & dt = QDateTime());
bool remove(const QString & sKey);
private:
void updateCost();
};
} // namespace detail
} // namespace cache
} // namespace qx
QX_DLL_EXPORT_QX_SINGLETON_HPP(qx::cache::detail::QxCache)
namespace qx {
namespace cache {
/*!
* \ingroup QxCache
* \brief Set the maximum allowed total cost of the cache to l. If the current total cost is greater than l, some objects are deleted immediately
*/
inline void max_cost(long l)
{ qx::cache::detail::QxCache::getSingleton()->setMaxCost(l); }
/*!
* \ingroup QxCache
* \brief Return the maximum allowed total cost of the cache
*/
inline long max_cost()
{ return qx::cache::detail::QxCache::getSingleton()->getMaxCost(); }
/*!
* \ingroup QxCache
* \brief Return the current cost used by the cache
*/
inline long current_cost()
{ return qx::cache::detail::QxCache::getSingleton()->getCurrCost(); }
/*!
* \ingroup QxCache
* \brief Return the number of objects in the cache
*/
inline long count()
{ return qx::cache::detail::QxCache::getSingleton()->count(); }
/*!
* \ingroup QxCache
* \brief Return true if the cache contains no object; otherwise return false
*/
inline bool is_empty()
{ return qx::cache::detail::QxCache::getSingleton()->isEmpty(); }
/*!
* \ingroup QxCache
* \brief Delete all the objects in the cache
*/
inline void clear()
{ qx::cache::detail::QxCache::getSingleton()->clear(); }
/*!
* \ingroup QxCache
* \brief Return true if the cache contains an object associated with key sKey; otherwise return false
*/
inline bool exist(const QString & sKey)
{ return qx::cache::detail::QxCache::getSingleton()->exist(sKey); }
/*!
* \ingroup QxCache
* \brief Delete the object associated with key sKey. Return true if the object was found in the cache; otherwise return false
*/
inline bool remove(const QString & sKey)
{ return qx::cache::detail::QxCache::getSingleton()->remove(sKey); }
/*!
* \ingroup QxCache
* \brief Insert object t into the cache with key sKey, associated cost lCost and insertion date-time dt. Any object with the same key already in the cache will be removed
*/
template <typename T>
inline bool set(const QString & sKey, T & t, long lCost = 1, const QDateTime & dt = QDateTime())
{
qx::any obj(t);
return qx::cache::detail::QxCache::getSingleton()->insert(sKey, obj, lCost, dt);
}
/*!
* \ingroup QxCache
* \brief Return the object of type T associated with key sKey, or return default instance of T() if the key does not exist in the cache
*/
template <typename T>
inline T get(const QString & sKey)
{
qx::any obj = qx::cache::detail::QxCache::getSingleton()->at(sKey);
if (obj.empty()) { return T(); }
try { return qx::any_cast<T>(obj); }
catch (const qx::bad_any_cast & err) { Q_UNUSED(err); return T(); }
catch (...) { return T(); }
}
/*!
* \ingroup QxCache
* \brief Return true if object t can be fetched with associated key sKey and insertion date-time dt; otherwise return false with an error description
*/
template <typename T>
inline qx_bool get(const QString & sKey, T & t, QDateTime & dt)
{
dt = QDateTime();
if (! qx::cache::exist(sKey)) { return qx_bool(false, 0, "[QxOrm] qx::cache : key doesn't exist in cache"); }
qx::any obj = qx::cache::detail::QxCache::getSingleton()->at(sKey);
dt = qx::cache::detail::QxCache::getSingleton()->insertionDateTime(sKey);
try { t = qx::any_cast<T>(obj); return qx_bool(true); }
catch (const qx::bad_any_cast & err) { Q_UNUSED(err); return qx_bool(false, 0, "[QxOrm] qx::cache : bad any cast exception"); }
catch (...) { return qx_bool(false, 0, "[QxOrm] qx::cache : unknown cast exception"); }
}
/*!
* \ingroup QxCache
* \brief Return true if object t can be fetched with associated key sKey; otherwise return false with an error description
*/
template <typename T>
inline qx_bool get(const QString & sKey, T & t)
{
QDateTime dt;
return qx::cache::get<T>(sKey, t, dt);
}
} // namespace cache
} // namespace qx
#endif // _QX_CACHE_H_