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include/QxSingleton/QxSingleton.h

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+/****************************************************************************
+**
+** https://www.qxorm.com/
+** Copyright (C) 2013 XDL Team (ic-east.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 XDL Team
+**
+** 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 :
+** ic-east.com
+**
+****************************************************************************/
+
+#ifndef _QX_SINGLETON_H_
+#define _QX_SINGLETON_H_
+
+#ifdef _MSC_VER
+#pragma once
+#endif
+
+/*!
+ * \file QxSingleton.h
+ * \author XDL Team
+ * \ingroup QxSingleton
+ * \brief Concrete class to define a thread-safe singleton of QxOrm library
+ */
+
+#include <QtCore/qmutex.h>
+#include <QtCore/qcoreapplication.h>
+
+#include <QxSingleton/IxSingleton.h>
+
+namespace qx
+{
+
+   /*!
+    * \ingroup QxSingleton
+    * \brief qx::QxSingleton<T> : concrete class to define a thread-safe singleton of type T
+    */
+   template <class T>
+   class QxSingleton : public IxSingleton
+   {
+
+   private:
+      static T *m_pSingleton;          //!< Singleton -> only 1 instance allowed
+      static QMutex m_oMutexSingleton; //!< Mutex -> 'QxSingleton' is thread-safe
+
+   protected:
+      QxSingleton(const QString &sKey) : IxSingleton(sKey) { ; }
+      virtual ~QxSingleton() { ; }
+
+   public:
+      static T *getSingleton();
+      static void deleteSingleton();
+
+   protected:
+      static bool isSingletonNull() { return (m_pSingleton == NULL); }
+
+      virtual void deleteInstance() { QxSingleton<T>::deleteSingleton(); }
+   };
+
+} // namespace qx
+
+#include "../../inl/QxSingleton/QxSingleton.inl"
+
+#endif // _QX_SINGLETON_H_