vaikene.ee Git - evaf/blob - src/libs/Common/globals.h

   1 /**
   2  * @file Common/globals.h
   3  * @brief Global constants and macros for eVaf
   4  * @author Enar Vaikene
   5  *
   6  * Copyright (c) 2011 Enar Vaikene
   7  *
   8  * This file is part of the eVaf C++ cross-platform application development framework.
   9  *
  10  * This file can be used under the terms of the GNU General Public License
  11  * version 3.0 as published by the Free Software Foundation and appearing in
  12  * the file LICENSE included in the packaging of this file. Please review the
  13  * the following information to ensure the GNU General Public License version
  14  * 3.0 requirements will be met: http://www.gnu.org/copyleft/gpl.html.
  15  *
  16  * Alternatively, this file may be used in accordance with the Commercial License
  17  * Agreement provided with the Software.
  18  */
  19
  20 #ifndef __COMMON_GLOBALS_H
  21 #  define __COMMON_GLOBALS_H
  22
  23 #include "libcommon.h"
  24 #include "ilogger.h"
  25
  26 /**
  27  * eVaf is a C++ cross-platform modular application development framework using Qt.
  28  *
  29  * The eVaf main executable is an empty container that needs to be filled with external modules to
  30  * provide the required functionality. The eVaf main GUI executable, if run without external modules,
  31  * shows just an empty window that can be closed to terminate the application. The eVaf main CLI
  32  * executable runs until terminated with CTRL+C.
  33  *
  34  * eVaf modules are loadable libraries (.so or .dll files) that implement the features and
  35  * functions of the application. By combining together different modules, an unique application can
  36  * be made in very little time. Every module implements a specific function or feature and only when
  37  * put together, the actual application is created.
  38  *
  39  * eVaf interfaces are the way how the functionality of eVaf modules is used. Every feature implemented
  40  * by a module has an interface used to feed the module with data or request information from the module.
  41  *
  42  * eVaf events are used by modules to send out information that they have collected or processed.
  43  * While interfaces are the way how to feed modules with data or requests, then events are mostly for
  44  * spontaneous data.
  45  *
  46  * Events broadcast by modules can have data objects attached to them. To avoid unnecessary copying of
  47  * data, these data objects are shared and reference-counted. When the data object is attached to the
  48  * event, its internal reference counter is increased by one. When the eVaf event queue has delivered
  49  * the event to all the subscribers, it destroys the event and decreases the reference-counter of the
  50  * data object by one. If no other module kept the data object, then the data object's reference counter
  51  * becomes zero and it is destroyed too.
  52  */
  53 namespace eVaf {
  54
  55 /**
  56  * Common eVaf library.
  57  *
  58  * This library contains interfaces, classes and functions shared by all the eVaf applications
  59  * and modules. This library is the required dependency for all the other libraries, modules and
  60  * applications.
  61  *
  62  * The common eVaf library shall be initialized with the eVaf::Common::init() function.
  63  */
  64 namespace Common {
  65
  66 /**
  67  * eVaf common library initialized
  68  * @return True if ok; false if the initialization failed
  69  *
  70  * Call this function to initialize the common eVaf library after creating the Qt application
  71  * object and before loading any of the modules.
  72  */
  73 extern bool COMMON_EXPORT init();
  74
  75 /**
  76  * Internal implementation of the common eVaf library.
  77  */
  78 namespace Internal {
  79 } // namespace eVaf::Common::Internal
  80 } // namespace eVaf::Common
  81 } // namespace eVaf
  82
  83 /**
  84  * Tests that the condition is true.
  85  *
  86  * This macro tests for the condition and if not true, exits with a fatal error.
  87  * Use this macro to test for conditions that must be met in order for the application
  88  * to continue.
  89  */
  90 #define EVAF_TEST(cond) \
  91     if (!cond) \
  92         EVAF_FATAL(#cond);
  93
  94 /**
  95  * Tests that the condition is true with a custom error message.
  96  *
  97  * This macro tests for the condition and if not true, exist with a custom fatal error message.
  98  */
  99 #define EVAF_TEST_X(const, msg) \
 100     if (!cond) \
 101         EVAF_FATAL(msg);
 102
 103 #endif // globals.h