granicus.if.org Git - icinga2/blob - lib/base/loader.hpp

   1 /******************************************************************************
   2  * Icinga 2                                                                   *
   3  * Copyright (C) 2012-2016 Icinga Development Team (https://www.icinga.org/)  *
   4  *                                                                            *
   5  * This program is free software; you can redistribute it and/or              *
   6  * modify it under the terms of the GNU General Public License                *
   7  * as published by the Free Software Foundation; either version 2             *
   8  * of the License, or (at your option) any later version.                     *
   9  *                                                                            *
  10  * This program is distributed in the hope that it will be useful,            *
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of             *
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              *
  13  * GNU General Public License for more details.                               *
  14  *                                                                            *
  15  * You should have received a copy of the GNU General Public License          *
  16  * along with this program; if not, write to the Free Software Foundation     *
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.             *
  18  ******************************************************************************/
  19
  20 #ifndef LOADER_H
  21 #define LOADER_H
  22
  23 #include "base/i2-base.hpp"
  24 #include "base/string.hpp"
  25 #include <boost/thread/tss.hpp>
  26 #include <boost/function.hpp>
  27 #include <queue>
  28
  29 namespace icinga
  30 {
  31
  32 struct DeferredInitializer
  33 {
  34 public:
  35         DeferredInitializer(const boost::function<void (void)>& callback, int priority)
  36             : m_Callback(callback), m_Priority(priority)
  37         { }
  38
  39         inline bool operator<(const DeferredInitializer& other) const
  40         {
  41                 return m_Priority < other.m_Priority;
  42         }
  43
  44         inline void operator()(void)
  45         {
  46                 m_Callback();
  47         }
  48
  49 private:
  50         boost::function<void (void)> m_Callback;
  51         int m_Priority;
  52 };
  53
  54 /**
  55  * Loader helper functions.
  56  *
  57  * @ingroup base
  58  */
  59 class I2_BASE_API Loader
  60 {
  61 public:
  62         static void LoadExtensionLibrary(const String& library);
  63
  64         static void AddDeferredInitializer(const boost::function<void(void)>& callback, int priority = 0);
  65         static void ExecuteDeferredInitializers(void);
  66
  67 private:
  68         Loader(void);
  69
  70         static boost::thread_specific_ptr<std::priority_queue<DeferredInitializer> >& GetDeferredInitializers(void);
  71
  72 };
  73
  74 }
  75
  76 #endif /* LOADER_H */