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annotate mde/init.d @ 6:dcb24afa0dce

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Some fixes from mde/text/format.d unittests plus a few more fixes. committer: Diggory Hardy <diggory.hardy@gmail.com>
author Diggory Hardy <diggory.hardy@gmail.com>
date Thu, 10 Jan 2008 18:33:24 +0000
parents 9a990644948c
children f63f4f41a2dc
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1 /**************************************************************************************************
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2 * Initialisation setup and exit cleanup module.
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3 *
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4 * This module controls most of the initialisation and deinitialisation of the program.
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5 *************************************************************************************************/
1
18491334a525 Finished format.d and parse.d modules; moved to mde/text. Partway implementing mde.mergetag.write.TextWriter.
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6 module mde.init;
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7
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8 import mde.exception;
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9
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10 import mde.input.input;
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11
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12 // tango imports
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13 import tango.core.Thread;
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14 import tango.util.log.Log : Log, Logger;
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15 import tango.util.log.ConsoleAppender : ConsoleAppender;
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16
4
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17 import derelict.sdl.sdl;
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18 import derelict.util.exception;
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19
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20 /**
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21 * Static CTOR
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22 *
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23 * This should handle a minimal amount of functionality where useful. For instance, configuring the
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24 * logger here and not in Init allows unittests to use the logger.
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25 */
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26 static this()
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27 {
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28 // For now, just log to the console:
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29 Logger root = Log.getRootLogger();
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30 root.setLevel(root.Level.Trace);
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31 root.addAppender(new ConsoleAppender);
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32 }
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33 static ~this()
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34 {
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35 }
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36
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37 /**
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38 * Init class
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39 *
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40 * A scope class created at beginning of the program and destroyed at the end; thus the CTOR
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41 * handles program initialisation and the DTOR handles program cleanup.
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42 */
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43 scope class Init
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44 {
4
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45 static Logger logger;
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46 static this() {
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47 logger = Log.getLogger ("mde.init.Init");
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48 }
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49
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50 /** CTOR − initialisation
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51 *
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52 * Runs general initialisation code, in a threaded manner where this isn't difficult.
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53 *
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54 * If this fails by throwing an exception, it must run necessary cleanup first since the DTOR
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55 * cannot be run. */
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56 /* In a single-threaded function this could be done with:
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57 * scope(failure) cleanup;
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58 * This won't work with a threaded init function since any threads completing succesfully will
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59 * not clean-up, and a fixed list of clean-up functions cannot be used since clean-up functions
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60 * must not run where the initialisation functions have failed.
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61 * Hence a list of clean-up functions is built similarly to scope(failure) --- see addCleanupFct.
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62 */
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63 this()
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64 {
4
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65 // Start all threads
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66 ThreadGroup tg = new ThreadGroup;
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67 tg.create(&initSDL);
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68
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69 // Do some initialisation in the main thread
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70 Input.instance.loadConfig (0);
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71
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72 // Wait for all threads to complete
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73 try {
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74 tg.joinAll (true); // rethrows any exceptions
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75 }
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76 catch (initException e) { // Any problems?
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77 // All cleanup-on-failure must be done here.
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78 runCleanupFcts();
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79 throw e; // Rethrow. Warning: if multiple threads throw exceptions, only one gets returned.
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80 }
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81
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82 }
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83
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84 /* Initialisation functions.
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85 *
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86 * These should each handle a separate area of initialisation such that these functions could
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87 * be run simultaneously in separate threads. */
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88 void initSDL () {
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89 try {
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90 // SDL Joystick, used by mde.input
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91 DerelictSDL.load();
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92 } catch (DerelictException de) {
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93 throw new DynamicLibraryLoadException (de.msg);
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94 }
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95 logger.info ("Derelict: loaded SDL");
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96
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97 SDL_Init (SDL_INIT_TIMER | SDL_INIT_JOYSTICK);
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98 addCleanupFct (&cleanupSDL);
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99 logger.info ("SDL initialised");
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100 }
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101
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102 ~this()
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103 {
4
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104 runCleanupFcts();
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105 }
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106
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107 /* Cleanup Functions.
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108 *
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109 * These may exist simply as something to add to the cleanup list... */
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110 static void cleanupSDL () {
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111 SDL_Quit();
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112 }
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113
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114 private static {
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115 void function ()[] cleanup; // all functions to be run for cleanup
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116 // Adding cleanup functions must be synchronized; use:
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117 void addCleanupFct (void function () fct) {
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118 synchronized cleanup ~= fct;
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119 }
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120 // Clean-up fcts are run in reverse order to how they're added:
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121 void runCleanupFcts () {
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122 foreach_reverse (fct; cleanup) fct();
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123 }
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124 }
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125 }
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126
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127 unittest {
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128 /* Fake init and cleanup. This happens before the CTOR runs so the extra Init.runCleanupFcts()
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129 * call isn't going to mess things up. The extra function called by runCleanupFcts won't cause
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130 * any harm either. */
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131 static bool initialised = false;
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132 static void cleanup () { initialised = false; }
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133
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134 static void init () {
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135 initialised = true;
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136 Init.addCleanupFct (&cleanup);
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137 }
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138
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139 init();
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140 assert (initialised);
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141 Init.runCleanupFcts();
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142 assert (!initialised);
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143 }