git.sesse.net Git - casparcg/blob - common/concurrency/com_context.h

   1 /*\r
   2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>\r
   3 *\r
   4 * This file is part of CasparCG (www.casparcg.com).\r
   5 *\r
   6 * CasparCG is free software: you can redistribute it and/or modify\r
   7 * it under the terms of the GNU General Public License as published by\r
   8 * the Free Software Foundation, either version 3 of the License, or\r
   9 * (at your option) any later version.\r
  10 *\r
  11 * CasparCG is distributed in the hope that it will be useful,\r
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  14 * GNU General Public License for more details.\r
  15 *\r
  16 * You should have received a copy of the GNU General Public License\r
  17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.\r
  18 *\r
  19 * Author: Robert Nagy, ronag89@gmail.com\r
  20 */\r
  21 \r
  22 #pragma once\r
  23 \r
  24 #include "executor.h"\r
  25 \r
  26 #include "../log/log.h"\r
  27 #include "../exception/exceptions.h"\r
  28 \r
  29 #define NOMINMAX\r
  30 #define WIN32_LEAN_AND_MEAN\r
  31 \r
  32 #include <Windows.h>\r
  33 \r
  34 #include <boost/noncopyable.hpp>\r
  35 #include <boost/thread/future.hpp>\r
  36 \r
  37 #include <functional>\r
  38 \r
  39 namespace caspar {\r
  40 \r
  41 template<typename T>\r
  42 class com_context : public executor\r
  43 {\r
  44         std::unique_ptr<T> instance_;\r
  45 public:\r
  46         com_context(const std::wstring& name) : executor(name)\r
  47         {\r
  48                 executor::begin_invoke([]\r
  49                 {\r
  50                         ::CoInitialize(nullptr);\r
  51                 });\r
  52         }\r
  53 \r
  54         ~com_context()\r
  55         {\r
  56                 if(!executor::begin_invoke([&]\r
  57                 {\r
  58                         instance_.reset(nullptr);\r
  59                         ::CoUninitialize();\r
  60                 }).timed_wait(boost::posix_time::milliseconds(500)))\r
  61                 {\r
  62                         CASPAR_LOG(error) << L"[com_contex] Timer expired, deadlock detected and released, leaking resources.";\r
  63                 }\r
  64         }\r
  65         \r
  66         void reset(const std::function<T*()>& factory = nullptr)\r
  67         {\r
  68                 executor::invoke([&]\r
  69                 {\r
  70                         instance_.reset();\r
  71                         if(factory)\r
  72                                 instance_.reset(factory());\r
  73                 });\r
  74         }\r
  75 \r
  76         T& operator*() const \r
  77         {\r
  78                 if(instance_ == nullptr)\r
  79                         BOOST_THROW_EXCEPTION(invalid_operation() << msg_info("Tried to access null context."));\r
  80 \r
  81                 return *instance_.get();\r
  82         }  // noexcept\r
  83 \r
  84         T* operator->() const \r
  85         {\r
  86                 if(instance_ == nullptr)\r
  87                         BOOST_THROW_EXCEPTION(invalid_operation() << msg_info("Tried to access null context."));\r
  88                 return instance_.get();\r
  89         }  // noexcept\r
  90 \r
  91         T* get() const\r
  92         {\r
  93                 return instance_.get();\r
  94         }  // noexcept\r
  95 \r
  96         operator bool() const {return get() != nullptr;}\r
  97 };\r
  98 \r
  99 }