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annotate src/observer.c @ 1109:77596f3d8d0c

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Minor changes on OpenVG graphic engine
author Thinker K.F. Li <thinker@codemud.net>
date Tue, 07 Dec 2010 12:42:41 +0800
parents e415c55b4a0d
children
rev   line source
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1 // -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 4; -*-
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2 // vim: sw=4:ts=8:sts=4
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3 #include <stdio.h>
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4 #include "mb_redraw_man.h"
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5 #include "mb_observer.h"
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6 #include "mb_tools.h"
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7
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8 #ifndef ASSERT
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9 #define ASSERT(x)
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10 #endif
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11
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12 subject_t *subject_new(observer_factory_t *factory, void *obj, int obj_type) {
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13 subject_t *subject;
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14
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15 subject = factory->subject_alloc(factory);
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16 if(subject == NULL)
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17 return NULL;
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18
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19 subject->obj = obj;
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20 subject->obj_type = obj_type;
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21 subject->flags = 0;
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22 subject->monitor_sub = NULL;
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23 STAILQ_INIT(subject->observers);
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24
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25 subject->factory = factory;
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26
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27 return subject;
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28 }
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29
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30 /*!
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31 * \todo Keep observer_factory following subject objects.
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32 */
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33 void subject_free(subject_t *subject) {
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34 observer_factory_t *factory = subject->factory;
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35 observer_t *observer;
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36 monitor_event_t mevt;
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37
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38 ASSERT(!(subject->flags & SUBF_FREE));
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39 if(subject->flags & SUBF_BUSY) {
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40 /* Postpond the request until busy status been stoped.
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41 * SUBF_BUSY means in subject_notify().
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42 */
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43 subject->flags |= SUBF_FREE;
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44 return;
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45 }
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46
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47 if(subject->monitor_sub) {
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48 mevt.event.type = EVT_MONITOR_FREE;
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49 mevt.subject = subject;
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50 mevt.observer = NULL;
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51 subject_notify(subject->monitor_sub, (event_t *)&mevt);
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52 }
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53
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54 while((observer = STAILQ_HEAD(subject->observers))) {
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55 STAILQ_REMOVE(subject->observers, observer_t, next, observer);
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56 factory->observer_free(factory, observer);
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57 }
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58 factory->subject_free(factory, subject);
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59 }
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61
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62 void subject_notify(subject_t *subject, event_t *evt) {
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63 observer_factory_t *factory = subject->factory;
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64 observer_t *observer;
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65 subject_t *old_subject;
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66 int stop_propagate = 0;
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67 int old_busy;
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68
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69 evt->tgt = subject;
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70 evt->flags = 0;
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71 while(subject) {
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72 /*!
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73 * \note What is happend when the subject is freed by observer?
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74 * Postponding the request of free until notification
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75 * been finished. (\ref SUBF_BUSY / \ref SUBF_FREE)
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76 */
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77 old_busy = subject->flags & SUBF_BUSY;
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78 subject->flags |= SUBF_BUSY;
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79
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80 evt->cur_tgt = subject;
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81 for(observer = STAILQ_HEAD(subject->observers);
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82 observer != NULL;
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83 observer = STAILQ_NEXT(observer_t, next, observer)) {
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84 if (observer->type == EVT_ANY || observer->type == evt->type) {
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85 observer->hdr(evt, observer->arg);
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86
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87 if(evt->flags & EVTF_STOP_NOTIFY) {
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88 stop_propagate = 1;
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89 break;
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90 }
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91 if(evt->flags & EVTF_STOP_PROPAGATE)
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92 stop_propagate = 1;
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93 }
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94 }
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96 if(!old_busy)
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97 subject->flags &= ~SUBF_BUSY;
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98
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99 old_subject = subject;
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100 subject = factory->get_parent_subject(factory, subject);
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101
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102 if(old_subject->flags & SUBF_STOP_PROPAGATE)
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103 stop_propagate = 1;
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104
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105 if(old_subject->flags & SUBF_FREE)
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106 subject_free(old_subject);
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108 if(stop_propagate)
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109 break;
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110 }
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111 }
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112
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113 /*! \brief Add an observer for specified type of events.
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114 */
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115 observer_t *subject_add_event_observer(subject_t *subject, int type,
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116 evt_handler hdr, void *arg) {
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117 observer_factory_t *factory = subject->factory;
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118 observer_t *observer;
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119 monitor_event_t mevt;
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120
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121 observer = factory->observer_alloc(factory);
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122 if(observer == NULL)
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123 return NULL;
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124 observer->hdr = hdr;
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125 observer->arg = arg;
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126 observer->type = type;
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127
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128 STAILQ_INS_TAIL(subject->observers, observer_t, next, observer);
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129
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130 if(subject->monitor_sub) {
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131 mevt.event.type = EVT_MONITOR_ADD;
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132 mevt.subject = subject;
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133 mevt.observer = observer;
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134 subject_notify(subject->monitor_sub, (event_t *)&mevt);
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135 }
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136
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137 return observer;
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138 }
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139
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140 /*! \brief Add an observer for specified type of events at head.
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141 */
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142 observer_t *subject_add_event_observer_head(subject_t *subject, int type,
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143 evt_handler hdr, void *arg) {
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144 observer_factory_t *factory = subject->factory;
224
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145 observer_t *observer;
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146 monitor_event_t mevt;
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147
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148 observer = factory->observer_alloc(factory);
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149 if(observer == NULL)
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150 return NULL;
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151 observer->hdr = hdr;
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152 observer->arg = arg;
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153 observer->type = type;
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154
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155 STAILQ_INS(subject->observers, observer_t, next, observer);
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156
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157 if(subject->monitor_sub) {
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158 mevt.event.type = EVT_MONITOR_ADD;
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159 mevt.subject = subject;
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160 mevt.observer = observer;
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161 subject_notify(subject->monitor_sub, (event_t *)&mevt);
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162 }
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163
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164 return observer;
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165 }
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166
192
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167 void subject_remove_observer(subject_t *subject,
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168 observer_t *observer) {
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169 observer_factory_t *factory = subject->factory;
224
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170 monitor_event_t mevt;
192
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171
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172 STAILQ_REMOVE(subject->observers, observer_t, next, observer);
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173
224
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174 if(subject->monitor_sub) {
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175 mevt.event.type = EVT_MONITOR_REMOVE;
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176 mevt.subject = subject;
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177 mevt.observer = observer;
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178 subject_notify(subject->monitor_sub, (event_t *)&mevt);
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179 }
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180
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181 factory->observer_free(factory, observer);
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182 }
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183
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184 #ifdef UNITTEST
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185
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186 #include <CUnit/Basic.h>
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187 #include <stdlib.h>
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188
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189 static subject_t *test_subject_alloc(observer_factory_t *factory) {
73
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190 subject_t *subject;
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191
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192 subject = (subject_t *)malloc(sizeof(subject_t));
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193 return subject;
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194 }
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195
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196 static void
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197 test_subject_free(observer_factory_t *factory, subject_t *subject) {
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198 free(subject);
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199 }
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200
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201 static observer_t *test_observer_alloc(observer_factory_t *factory) {
73
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202 observer_t *observer;
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203
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204 observer = (observer_t *)malloc(sizeof(observer_t));
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205 return observer;
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206 }
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207
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208 static void
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209 test_observer_free(observer_factory_t *factory, observer_t *observer) {
73
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210 free(observer);
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211 }
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212
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213 static subject_t *test_get_parent_subject(observer_factory_t *factory,
73
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214 subject_t *subject) {
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215 return NULL;
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216 }
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217
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218 static observer_factory_t test_factory = {
73
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219 test_subject_alloc,
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220 test_subject_free,
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221 test_observer_alloc,
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222 test_observer_free,
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223 test_get_parent_subject
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224 };
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225
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226 static void handler(event_t *evt, void *arg) {
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227 int *cnt = (int *)arg;
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228
74
3e3e074120a7 test case for observer
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diff changeset
229 CU_ASSERT(evt->type == EVT_MOUSE_OUT);
73
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230 (*cnt)++;
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231 }
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232
224
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diff changeset
233 static void test_observer(void) {
73
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234 subject_t *subject;
74
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235 observer_t *observer[2];
73
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236 event_t evt;
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237 int cnt = 0;
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238
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239 subject = subject_new(&test_factory, NULL, 0);
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240 subject->flags |= SUBF_STOP_PROPAGATE;
192
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diff changeset
241 observer[0] = subject_add_observer(subject, handler, &cnt);
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242 observer[1] = subject_add_observer(subject, handler, &cnt);
73
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243
74
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diff changeset
244 evt.type = EVT_MOUSE_OUT;
73
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245 evt.tgt = NULL;
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246 evt.cur_tgt = NULL;
192
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diff changeset
247 subject_notify(subject, &evt);
74
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diff changeset
248 CU_ASSERT(cnt == 2);
73
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249
192
54fdc2a65242 Remove factory from observer APIs.
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diff changeset
250 subject_remove_observer(subject, observer[0]);
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diff changeset
251 subject_remove_observer(subject, observer[1]);
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diff changeset
252 subject_free(subject);
73
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253 }
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254
224
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diff changeset
255 static void monitor_handler(event_t *evt, void *arg) {
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diff changeset
256 int *cnt = (int *)arg;
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diff changeset
257
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diff changeset
258 (*cnt)++;
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diff changeset
259 }
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diff changeset
260
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diff changeset
261 static void test_monitor(void) {
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diff changeset
262 subject_t *subject, *monitor;
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diff changeset
263 observer_t *observer[2];
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diff changeset
264 int cnt = 0;
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diff changeset
265
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diff changeset
266 subject = subject_new(&test_factory, NULL, 0);
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diff changeset
267 monitor = subject_new(&test_factory, NULL, 0);
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diff changeset
268 subject_set_monitor(subject, monitor);
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diff changeset
269
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diff changeset
270 observer[0] = subject_add_observer(monitor, monitor_handler, &cnt);
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271 observer[1] = subject_add_observer(subject, NULL, NULL);
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272 CU_ASSERT(cnt == 1);
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273
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274 subject_remove_observer(subject, observer[1]);
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275 CU_ASSERT(cnt == 2);
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276
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277 subject_free(subject);
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278 CU_ASSERT(cnt == 3);
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279
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280 subject_remove_observer(monitor, observer[0]);
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281 subject_free(monitor);
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282 }
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283
73
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284 CU_pSuite get_observer_suite(void) {
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285 CU_pSuite suite;
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286
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287 suite = CU_add_suite("Suite_observer", NULL, NULL);
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288 CU_ADD_TEST(suite, test_observer);
224
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289 CU_ADD_TEST(suite, test_monitor);
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290
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291 return suite;
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292 }
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293
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294 #endif /* UNITTEST */