src/MergeThread.hpp

   1 /*
   2 Copyright_License {
   3
   4   XCSoar Glide Computer - http://www.xcsoar.org/
   5   Copyright (C) 2000-2013 The XCSoar Project
   6   A detailed list of copyright holders can be found in the file "AUTHORS".
   7
   8   This program is free software; you can redistribute it and/or
   9   modify it under the terms of the GNU General Public License
  10   as published by the Free Software Foundation; either version 2
  11   of the License, or (at your option) any later version.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with this program; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21 }
  22 */
  23
  24 #ifndef XCSOAR_MERGE_THREAD_HPP
  25 #define XCSOAR_MERGE_THREAD_HPP
  26
  27 #include "Thread/WorkerThread.hpp"
  28 #include "Computer/BasicComputer.hpp"
  29 #include "FLARM/FlarmComputer.hpp"
  30 #include "NMEA/MoreData.hpp"
  31
  32 class DeviceBlackboard;
  33
  34 /**
  35  * The MergeThread collects new data from the DeviceBlackboard, merges
  36  * it and runs a number of cheap calculations.
  37  */
  38 class MergeThread final : public WorkerThread {
  39   DeviceBlackboard &device_blackboard;
  40
  41   /**
  42    * The previous values at the time of the last GPS fix (last
  43    * LocationAvailable modification).
  44    */
  45   MoreData last_fix;
  46
  47   /**
  48    * The previous values at the time of the last update of any
  49    * attribute (last Connected modification).
  50    */
  51   MoreData last_any;
  52
  53   BasicComputer computer;
  54   FlarmComputer flarm_computer;
  55
  56 public:
  57   MergeThread(DeviceBlackboard &_device_blackboard);
  58
  59   /**
  60    * This method is called during XCSoar startup, for the initial run
  61    * of the MergeThread.
  62    */
  63   void FirstRun() {
  64     assert(!IsDefined());
  65
  66     Process();
  67   }
  68
  69   bool Start(bool suspended=false) {
  70     if (!WorkerThread::Start(suspended))
  71       return false;
  72
  73     SetLowPriority();
  74     return true;
  75   }
  76
  77 private:
  78   void Process();
  79
  80 protected:
  81   virtual void Tick();
  82 };
  83
  84 #endif