Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like HttplugExtension often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use HttplugExtension, and based on these observations, apply Extract Interface, too.
1 | <?php |
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30 | class HttplugExtension extends Extension |
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31 | { |
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32 | /** |
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33 | * {@inheritdoc} |
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34 | */ |
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35 | 9 | public function load(array $configs, ContainerBuilder $container) |
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79 | |||
80 | /** |
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81 | * Configure client services. |
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82 | * |
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83 | * @param ContainerBuilder $container |
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84 | * @param array $config |
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85 | */ |
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86 | 9 | private function configureClients(ContainerBuilder $container, array $config) |
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108 | |||
109 | /** |
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110 | * @param ContainerBuilder $container |
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111 | * @param array $config |
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112 | */ |
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113 | 9 | private function configureSharedPlugins(ContainerBuilder $container, array $config) |
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114 | { |
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115 | 9 | if (!empty($config['authentication'])) { |
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116 | $this->configureAuthentication($container, $config['authentication']); |
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117 | } |
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118 | 9 | unset($config['authentication']); |
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119 | |||
120 | 9 | foreach ($config as $name => $pluginConfig) { |
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121 | 9 | $pluginId = 'httplug.plugin.'.$name; |
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122 | |||
123 | 9 | if ($pluginConfig['enabled']) { |
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124 | 9 | $def = $container->getDefinition($pluginId); |
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125 | 9 | $this->configurePluginByName($name, $def, $pluginConfig, $container, $pluginId); |
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126 | 9 | } else { |
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127 | 9 | $container->removeDefinition($pluginId); |
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128 | } |
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129 | 9 | } |
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130 | 9 | } |
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131 | |||
132 | /** |
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133 | * @param string $name |
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134 | * @param Definition $definition |
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135 | * @param array $config |
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136 | * @param ContainerBuilder $container In case we need to add additional services for this plugin |
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137 | * @param string $serviceId Service id of the plugin, in case we need to add additional services for this plugin. |
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138 | */ |
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139 | 9 | private function configurePluginByName($name, Definition $definition, array $config, ContainerInterface $container, $serviceId) |
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140 | { |
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141 | switch ($name) { |
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142 | 9 | case 'cache': |
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143 | $definition |
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144 | ->replaceArgument(0, new Reference($config['cache_pool'])) |
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145 | ->replaceArgument(1, new Reference($config['stream_factory'])) |
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146 | ->replaceArgument(2, $config['config']); |
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147 | break; |
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148 | 9 | case 'cookie': |
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149 | $definition->replaceArgument(0, new Reference($config['cookie_jar'])); |
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150 | break; |
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151 | 9 | case 'decoder': |
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152 | 9 | $definition->addArgument([ |
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153 | 9 | 'use_content_encoding' => $config['use_content_encoding'], |
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154 | 9 | ]); |
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155 | 9 | break; |
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156 | 9 | case 'history': |
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157 | $definition->replaceArgument(0, new Reference($config['journal'])); |
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158 | break; |
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159 | 9 | case 'logger': |
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160 | 9 | $definition->replaceArgument(0, new Reference($config['logger'])); |
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161 | 9 | if (!empty($config['formatter'])) { |
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162 | $definition->replaceArgument(1, new Reference($config['formatter'])); |
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163 | } |
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164 | 9 | break; |
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165 | 9 | case 'redirect': |
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166 | 9 | $definition->addArgument([ |
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167 | 9 | 'preserve_header' => $config['preserve_header'], |
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168 | 9 | 'use_default_for_multiple' => $config['use_default_for_multiple'], |
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169 | 9 | ]); |
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170 | 9 | break; |
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171 | 9 | case 'retry': |
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172 | 9 | $definition->addArgument([ |
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173 | 9 | 'retries' => $config['retry'], |
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174 | 9 | ]); |
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175 | 9 | break; |
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176 | 9 | case 'stopwatch': |
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177 | 9 | $definition->replaceArgument(0, new Reference($config['stopwatch'])); |
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178 | 9 | break; |
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179 | |||
180 | /* client specific plugins */ |
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181 | |||
182 | 3 | case 'add_host': |
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183 | 3 | $uriService = $serviceId.'.host_uri'; |
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184 | 3 | $this->createUri($container, $uriService, $config['host']); |
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185 | 3 | $definition->replaceArgument(0, new Reference($uriService)); |
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186 | 3 | $definition->replaceArgument(1, [ |
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187 | 3 | 'replace' => $config['replace'], |
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188 | 3 | ]); |
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189 | 3 | break; |
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190 | |||
191 | default: |
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192 | throw new \InvalidArgumentException(sprintf('Internal exception: Plugin %s is not handled', $name)); |
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193 | } |
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194 | 9 | } |
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195 | |||
196 | /** |
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197 | * @param ContainerBuilder $container |
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198 | * @param array $config |
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199 | */ |
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200 | private function configureAuthentication(ContainerBuilder $container, array $config) |
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201 | { |
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202 | foreach ($config as $name => $values) { |
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203 | $authServiceKey = sprintf('httplug.plugin.authentication.%s.auth', $name); |
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204 | switch ($values['type']) { |
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205 | case 'bearer': |
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206 | $container->register($authServiceKey, Bearer::class) |
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207 | ->addArgument($values['token']); |
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208 | break; |
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209 | case 'basic': |
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210 | $container->register($authServiceKey, BasicAuth::class) |
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211 | ->addArgument($values['username']) |
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212 | ->addArgument($values['password']); |
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213 | break; |
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214 | case 'wsse': |
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215 | $container->register($authServiceKey, Wsse::class) |
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216 | ->addArgument($values['username']) |
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217 | ->addArgument($values['password']); |
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218 | break; |
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219 | case 'service': |
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220 | $authServiceKey = $values['service']; |
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221 | break; |
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222 | default: |
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223 | throw new \LogicException(sprintf('Unknown authentication type: "%s"', $values['type'])); |
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224 | } |
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225 | |||
226 | $container->register('httplug.plugin.authentication.'.$name, AuthenticationPlugin::class) |
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227 | ->addArgument(new Reference($authServiceKey)); |
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228 | } |
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229 | } |
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230 | |||
231 | /** |
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232 | * @param ContainerBuilder $container |
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233 | * @param string $name |
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234 | * @param array $arguments |
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235 | * @param bool $profiling |
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236 | */ |
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237 | private function configureClient(ContainerBuilder $container, $name, array $arguments, $profiling) |
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329 | |||
330 | /** |
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331 | * Create a URI object with the default URI factory. |
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332 | * |
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333 | * @param ContainerBuilder $container |
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334 | * @param string $serviceId Name of the private service to create |
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335 | * @param string $uri String representation of the URI |
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336 | */ |
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337 | private function createUri(ContainerBuilder $container, $serviceId, $uri) |
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346 | |||
347 | /** |
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348 | * Make the user can select what client is used for auto discovery. If none is provided, a service will be created |
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349 | * by finding a client using auto discovery. |
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350 | * |
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351 | * @param ContainerBuilder $container |
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352 | * @param array $config |
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353 | */ |
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354 | private function configureAutoDiscoveryClients(ContainerBuilder $container, array $config) |
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392 | |||
393 | /** |
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394 | * Find a client with auto discovery and return a service Reference to it. |
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395 | * |
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396 | * @param ContainerBuilder $container |
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397 | * @param string $name |
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398 | * @param callable $factory |
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399 | * @param bool $profiling |
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400 | * |
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401 | * @return string service id |
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402 | */ |
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403 | private function registerAutoDiscoverableClient(ContainerBuilder $container, $name, $factory, $profiling) |
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429 | |||
430 | /** |
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431 | * Create a new plugin service for this client. |
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432 | * |
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433 | * @param ContainerBuilder $container |
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434 | * @param string $serviceId |
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435 | * |
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436 | * @return string |
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437 | */ |
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438 | private function registerDebugPlugin(ContainerBuilder $container, $serviceId) |
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451 | |||
452 | /** |
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453 | * {@inheritdoc} |
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454 | */ |
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455 | public function getConfiguration(array $config, ContainerBuilder $container) |
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459 | } |
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460 |
Unless you are absolutely sure that the expression can never be null because of other conditions, we strongly recommend to add an additional type check to your code: