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QxCache.h
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    00001 /****************************************************************************
    00002 **
    00003 ** http://www.qxorm.com/
    00004 ** Copyright (C) 2013 Lionel Marty (contact@qxorm.com)
    00005 **
    00006 ** This file is part of the QxOrm library
    00007 **
    00008 ** This software is provided 'as-is', without any express or implied
    00009 ** warranty. In no event will the authors be held liable for any
    00010 ** damages arising from the use of this software
    00011 **
    00012 ** Commercial Usage
    00013 ** Licensees holding valid commercial QxOrm licenses may use this file in
    00014 ** accordance with the commercial license agreement provided with the
    00015 ** Software or, alternatively, in accordance with the terms contained in
    00016 ** a written agreement between you and Lionel Marty
    00017 **
    00018 ** GNU General Public License Usage
    00019 ** Alternatively, this file may be used under the terms of the GNU
    00020 ** General Public License version 3.0 as published by the Free Software
    00021 ** Foundation and appearing in the file 'license.gpl3.txt' included in the
    00022 ** packaging of this file. Please review the following information to
    00023 ** ensure the GNU General Public License version 3.0 requirements will be
    00024 ** met : http://www.gnu.org/copyleft/gpl.html
    00025 **
    00026 ** If you are unsure which license is appropriate for your use, or
    00027 ** if you have questions regarding the use of this file, please contact :
    00028 ** contact@qxorm.com
    00029 **
    00030 ****************************************************************************/
    00031
    00032 #ifndef _QX_CACHE_H_
    00033 #define _QX_CACHE_H_
    00034
    00035 #ifdef _MSC_VER
    00036 #pragma once
    00037 #endif
    00038
    00046 #include <boost/any.hpp>
    00047 #include <boost/tuple/tuple.hpp>
    00048 #include <boost/tuple/tuple_comparison.hpp>
    00049 #include <boost/tuple/tuple_io.hpp>
    00050
    00051 #include <QxCommon/QxBool.h>
    00052
    00053 #include <QxCollection/QxCollection.h>
    00054
    00055 #include <QxSingleton/QxSingleton.h>
    00056
    00057 namespace qx {
    00058 namespace cache {
    00059 namespace detail {
    00060
    00061 class QX_DLL_EXPORT QxCache : public qx::QxSingleton<QxCache>
    00062 {
    00063
    00064    friend class qx::QxSingleton<QxCache>;
    00065
    00066 protected:
    00067
    00068    typedef boost::tuple<long, QDateTime, boost::any> type_qx_cache;
    00069    typedef qx::QxCollection<QString, type_qx_cache> type_qx_lst_cache;
    00070
    00071    type_qx_lst_cache m_cache;
    00072    QMutex m_oMutexCache;
    00073    long m_lMaxCost;
    00074    long m_lCurrCost;
    00075
    00076 public:
    00077
    00078    QxCache();
    00079    virtual ~QxCache();
    00080
    00081    long getCurrCost() const;
    00082    long getMaxCost() const;
    00083    void setMaxCost(long l);
    00084
    00085    long count() const;
    00086    long size() const;
    00087    bool isEmpty() const;
    00088    bool exist(const QString & sKey) const;
    00089    bool contains(const QString & sKey) const;
    00090    boost::any at(const QString & sKey);
    00091    long insertionCost(const QString & sKey);
    00092    QDateTime insertionDateTime(const QString & sKey);
    00093    void clear();
    00094
    00095    bool insert(const QString & sKey, const boost::any & anyObj, long lCost = 1, const QDateTime & dt = QDateTime());
    00096    bool remove(const QString & sKey);
    00097
    00098 private:
    00099
    00100    void updateCost();
    00101
    00102 };
    00103
    00104 } // namespace detail
    00105 } // namespace cache
    00106 } // namespace qx
    00107
    00108 QX_DLL_EXPORT_QX_SINGLETON_HPP(qx::cache::detail::QxCache)
    00109
    00110 namespace qx {
    00111 namespace cache {
    00112
    00117 inline void max_cost(long l)
    00118 { qx::cache::detail::QxCache::getSingleton()->setMaxCost(l); }
    00119
    00124 inline long max_cost()
    00125 { return qx::cache::detail::QxCache::getSingleton()->getMaxCost(); }
    00126
    00131 inline long current_cost()
    00132 { return qx::cache::detail::QxCache::getSingleton()->getCurrCost(); }
    00133
    00138 inline long count()
    00139 { return qx::cache::detail::QxCache::getSingleton()->count(); }
    00140
    00145 inline bool is_empty()
    00146 { return qx::cache::detail::QxCache::getSingleton()->isEmpty(); }
    00147
    00152 inline void clear()
    00153 { qx::cache::detail::QxCache::getSingleton()->clear(); }
    00154
    00159 inline bool exist(const QString & sKey)
    00160 { return qx::cache::detail::QxCache::getSingleton()->exist(sKey); }
    00161
    00166 inline bool remove(const QString & sKey)
    00167 { return qx::cache::detail::QxCache::getSingleton()->remove(sKey); }
    00168
    00173 template <typename T>
    00174 inline bool set(const QString & sKey, T & t, long lCost = 1, const QDateTime & dt = QDateTime())
    00175 {
    00176    boost::any obj(t);
    00177    return qx::cache::detail::QxCache::getSingleton()->insert(sKey, obj, lCost, dt);
    00178 }
    00179
    00184 template <typename T>
    00185 inline T get(const QString & sKey)
    00186 {
    00187    boost::any obj = qx::cache::detail::QxCache::getSingleton()->at(sKey);
    00188    if (obj.empty()) { return T(); }
    00189    try { return boost::any_cast<T>(obj); }
    00190    catch (const boost::bad_any_cast & err) { Q_UNUSED(err); return T(); }
    00191    catch (...) { return T(); }
    00192 }
    00193
    00198 template <typename T>
    00199 inline qx_bool get(const QString & sKey, T & t, QDateTime & dt)
    00200 {
    00201    dt = QDateTime();
    00202    if (! qx::cache::exist(sKey)) { return qx_bool(false, 0, "[QxOrm] qx::cache : key doesn't exist in cache"); }
    00203    boost::any obj = qx::cache::detail::QxCache::getSingleton()->at(sKey);
    00204    dt = qx::cache::detail::QxCache::getSingleton()->insertionDateTime(sKey);
    00205    try { t = boost::any_cast<T>(obj); return qx_bool(true); }
    00206    catch (const boost::bad_any_cast & err) { Q_UNUSED(err); return qx_bool(false, 0, "[QxOrm] qx::cache : bad any cast exception"); }
    00207    catch (...) { return qx_bool(false, 0, "[QxOrm] qx::cache : unknown cast exception"); }
    00208 }
    00209
    00214 template <typename T>
    00215 inline qx_bool get(const QString & sKey, T & t)
    00216 {
    00217    QDateTime dt;
    00218    return qx::cache::get<T>(sKey, t, dt);
    00219 }
    00220
    00221 } // namespace cache
    00222 } // namespace qx
    00223
    00224 #endif // _QX_CACHE_H_