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1 | <?php |
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2 | declare(strict_types = 1); |
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3 | |||
4 | /** |
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5 | * Micro |
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6 | * |
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7 | * @author Raffael Sahli <[email protected]> |
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8 | * @copyright Copyright (c) 2017 gyselroth GmbH (https://gyselroth.com) |
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9 | * @license MIT https://opensource.org/licenses/MIT |
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10 | */ |
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11 | |||
12 | namespace Micro; |
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13 | |||
14 | use \ReflectionClass; |
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15 | use \Closure; |
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16 | use \Micro\Container\Exception; |
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0 ignored issues
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17 | use \Micro\Container\AdapterAwareInterface; |
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18 | use \Psr\Container\ContainerInterface; |
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19 | |||
20 | class Container implements ContainerInterface |
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21 | { |
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22 | /** |
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23 | * Config |
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24 | * |
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25 | * @var array |
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26 | */ |
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27 | protected $config = []; |
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28 | |||
29 | |||
30 | /** |
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31 | * Service registry |
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32 | * |
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33 | * @var array |
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34 | */ |
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35 | protected $service = []; |
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36 | |||
37 | |||
38 | /** |
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39 | * Registered but not initialized service registry |
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40 | * |
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41 | * @var array |
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42 | */ |
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43 | protected $registry = []; |
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44 | |||
45 | |||
46 | /** |
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47 | * Create container |
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48 | * |
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49 | * @param array $config |
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50 | */ |
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51 | public function __construct(Iterable $config=[]) |
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52 | { |
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53 | $this->config = $config; |
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54 | $container = $this; |
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55 | $this->add(ContainerInterface::class, function() use($container){ |
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56 | return $container; |
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57 | }); |
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58 | } |
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59 | |||
60 | |||
61 | /** |
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62 | * Get service |
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63 | * |
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64 | * @param string $name |
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65 | * @return mixed |
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66 | */ |
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67 | public function get($name) |
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68 | { |
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69 | if($this->has($name)) { |
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70 | return $this->service[$name]['instance']; |
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71 | } else { |
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72 | if(isset($this->registry[$name])) { |
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73 | $this->service[$name]['instance'] = $this->registry[$name]->call($this); |
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74 | unset($this->registry[$name]); |
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75 | return $this->service[$name]['instance']; |
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76 | } else { |
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77 | return $this->autoWire($name); |
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78 | } |
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79 | } |
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80 | } |
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81 | |||
82 | |||
83 | /** |
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84 | * Get new instance (Do not store in container) |
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85 | * |
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86 | * @param string $name |
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87 | * @return mixed |
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88 | */ |
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89 | public function getNew(string $name) |
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90 | { |
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91 | if(isset($this->registry[$name])) { |
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92 | return $this->registry[$name]->call($this); |
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93 | } else { |
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94 | return $this->autoWire($name); |
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95 | } |
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96 | } |
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97 | |||
98 | |||
99 | /** |
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100 | * Add service |
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101 | * |
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102 | * @param string $name |
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103 | * @param Closure $service |
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104 | * @return Container |
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105 | */ |
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106 | public function add(string $name, Closure $service): Container |
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107 | { |
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108 | if($this->has($name)) { |
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109 | throw new Exception('service '.$name.' is already registered'); |
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110 | } |
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111 | |||
112 | $this->registry[$name] = $service; |
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113 | return $this; |
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114 | } |
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115 | |||
116 | |||
117 | /** |
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118 | * Check if service is registered |
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119 | * |
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120 | * @return bool |
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121 | */ |
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122 | public function has($name): bool |
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123 | { |
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124 | return isset($this->service[$name]); |
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125 | } |
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126 | |||
127 | |||
128 | /** |
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129 | * Auto wire |
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130 | * |
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131 | * @param string $name |
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132 | * @param Iterable $config |
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133 | * @param array $parents |
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134 | * @return mixed |
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135 | */ |
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136 | protected function autoWire(string $name, $config=null, array $parents=[]) |
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137 | { |
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138 | if($config === null) { |
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139 | $config = $this->config; |
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140 | } |
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141 | |||
142 | $class = $name; |
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143 | $sub_config = $config; |
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144 | if(isset($config[$name])) { |
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145 | if(isset($config[$name]['use'])) { |
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146 | $class = $config[$name]['use']; |
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147 | } elseif(isset($config[$name]['name'])) { |
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148 | $class = $config[$name]['name']; |
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149 | } |
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150 | |||
151 | $config = $config[$name]; |
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152 | } else { |
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153 | $config = []; |
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154 | } |
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155 | |||
156 | try { |
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157 | $reflection = new ReflectionClass($class); |
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158 | } catch(\Exception $e) { |
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159 | throw new Exception($class.' can not be resolved to an existing class'); |
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160 | } |
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161 | |||
162 | $constructor = $reflection->getConstructor(); |
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163 | |||
164 | if($constructor === null) { |
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165 | return new $class(); |
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166 | } else { |
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167 | $params = $constructor->getParameters(); |
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168 | $args = []; |
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169 | |||
170 | foreach($params as $param) { |
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171 | $type = $param->getClass(); |
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172 | $param_name = $param->getName(); |
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173 | |||
174 | if($type === null) { |
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175 | try { |
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176 | $args[$param_name] = $this->getParam($name, $param_name, $sub_config); |
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177 | } catch(Exception $e) { |
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178 | if($param->isDefaultValueAvailable()) { |
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179 | $args[$param_name] = $param->getDefaultValue(); |
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180 | } elseif($param->allowsNull()) { |
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181 | $args[$param_name] = null; |
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182 | } else { |
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183 | throw $e; |
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184 | } |
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185 | } |
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186 | } else { |
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187 | $type_class = $type->getName(); |
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188 | |||
189 | if($type_class === $name) { |
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190 | throw new Exception('class '.$type_class.' can not depend on itself'); |
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191 | } |
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192 | |||
193 | $args[$param_name] = $this->findParentService($name, $type_class, $config, $parents); |
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194 | } |
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195 | } |
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196 | |||
197 | return $this->createInstance($name, $reflection, $args, $config, $parents); |
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198 | } |
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199 | } |
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200 | |||
201 | |||
202 | /** |
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203 | * Traverse services with parents and find correct service to use |
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204 | * |
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205 | * @param string $name |
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206 | * @param string $class |
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207 | * @return mixed |
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208 | */ |
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209 | protected function findParentService(string $name, string $class, $config, $parents) |
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210 | { |
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211 | $service = null; |
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212 | $services = $this->service; |
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213 | foreach(array_reverse($parents) as $name => $parent) { |
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214 | if(isset($services[$name])) { |
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215 | $service = $services[$name]; |
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216 | if(isset($services['service'])) { |
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217 | $services = $services['service']; } |
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218 | else { |
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219 | break; |
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220 | } |
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221 | } else { |
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222 | break; |
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223 | } |
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224 | } |
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225 | |||
226 | if($service !== null) { |
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227 | return $service['instance']; |
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228 | } |
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229 | |||
230 | foreach(array_reverse($parents) as $parent) { |
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231 | if(isset($parent['service'][$class])) { |
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232 | return $this->autoWire($class, $parent['service'], $parents); |
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233 | } |
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234 | } |
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235 | |||
236 | return $this->get($class); |
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237 | } |
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238 | |||
239 | |||
240 | /** |
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241 | * Create instance |
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242 | * |
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243 | * @param string $name |
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244 | * @param ReflectionClass $class |
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245 | * @param array $args |
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246 | * @return mixed |
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247 | */ |
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248 | protected function createInstance(string $name, ReflectionClass $class, array $args, Iterable $config, $parents=[]) |
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249 | { |
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250 | $instance = $class->newInstanceArgs($args); |
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251 | |||
252 | $loop = &$this->service; |
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253 | foreach($parents as $p => $parent) { |
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254 | $loop = &$loop[$p]; |
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255 | } |
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256 | if(count($parents) === 0) { |
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257 | $loop[$name]['instance'] = $instance; |
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258 | } else { |
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259 | $loop['service'][$name]['instance'] = $instance; |
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260 | } |
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261 | |||
262 | |||
263 | $parents[$name] = $config; |
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264 | $parents_orig = $parents; |
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265 | |||
266 | array_unshift($parents, $name); |
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267 | |||
268 | if($instance instanceof AdapterAwareInterface) { |
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269 | if(isset($config['adapter'])) { |
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270 | $adapters = $config['adapter']; |
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271 | } else { |
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272 | $adapters = $instance->getDefaultAdapter(); |
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273 | } |
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274 | |||
275 | foreach($adapters as $adapter => $service) { |
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276 | if(isset($service['enabled']) && $service['enabled'] === '0') { |
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277 | continue; |
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278 | } |
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279 | |||
280 | $parents = $parents_orig; |
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281 | $parents[$adapter] = $service; |
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282 | $class = $adapter; |
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283 | $adapter_instance = $this->autoWire($class, $adapters, $parents); |
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284 | |||
285 | if(isset($service['expose']) && $service['expose']) { |
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286 | $this->service[$adapter]['instance'] = $adapter_instance; |
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287 | } |
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288 | |||
289 | $instance->injectAdapter($adapter_instance, $adapter); |
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290 | } |
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291 | } |
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292 | |||
293 | return $instance; |
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294 | } |
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295 | |||
296 | |||
297 | /** |
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298 | * Parse param value |
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299 | * |
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300 | * @param mixed $param |
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301 | * @return mixed |
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302 | */ |
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303 | protected function parseParam($param) |
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304 | { |
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305 | if(is_iterable($param)) { |
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306 | foreach($param as $key => $value) { |
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307 | $param[$key] = $this->parseParam($value); |
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308 | } |
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309 | |||
310 | return $param; |
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311 | } elseif(is_string($param)) { |
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312 | if(preg_match('#\{ENV\(([A-Za-z0-9_]+)(?:(,?)(.*))\)\}#', $param, $match)) { |
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313 | if(count($match) !== 4) { |
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314 | return $param; |
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315 | } |
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316 | |||
317 | $env = getenv($match[1]); |
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318 | if($env === false && !empty($match[3])) { |
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319 | return str_replace($match[0], $match[3], $param); |
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320 | } elseif($env === false) { |
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321 | throw new Exception('env variable '.$match[1].' required but it is neither set not a default value exists'); |
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322 | } else { |
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323 | return str_replace($match[0], $env, $param); |
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324 | } |
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325 | } else { |
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326 | return $param; |
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327 | } |
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328 | } else { |
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329 | return $param; |
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330 | } |
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331 | } |
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332 | |||
333 | |||
334 | |||
335 | |||
336 | /** |
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337 | * Get config value |
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338 | * |
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339 | * @param string $name |
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340 | * @param string $param |
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341 | * @return mixed |
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342 | */ |
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343 | public function getParam(string $name, string $param, ?Iterable $config=null) |
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344 | { |
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345 | if($config === null) { |
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346 | $config = $this->config; |
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347 | } |
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348 | |||
349 | if(!isset($config[$name]['options'][$param])) { |
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350 | throw new Exception('no configuration available for required service parameter '.$param); |
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351 | } |
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352 | |||
353 | return $this->parseParam($config[$name]['options'][$param]); |
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354 | } |
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355 | } |
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356 |
Let’s assume that you have a directory layout like this:
and let’s assume the following content of
Bar.php
:If both files
OtherDir/Foo.php
andSomeDir/Foo.php
are loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.php
However, as
OtherDir/Foo.php
does not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php
, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: