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 Service 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 Service, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 11 | class Service extends Singleton |
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| 12 | { |
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| 13 | /** |
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| 14 | * @var String Url de destino de la llamada |
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| 15 | */ |
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| 16 | private $url; |
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| 17 | /** |
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| 18 | * @var array Parámetros de la llamada |
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| 19 | */ |
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| 20 | private $params; |
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| 21 | /** |
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| 22 | * @var array Opciones llamada |
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| 23 | */ |
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| 24 | private $options; |
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| 25 | /** |
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| 26 | * @var array Cabeceras de la llamada |
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| 27 | */ |
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| 28 | private $headers; |
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| 29 | /** |
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| 30 | * @var string type |
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| 31 | */ |
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| 32 | private $type; |
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| 33 | /** |
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| 34 | * @var resource $con |
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| 35 | */ |
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| 36 | private $con; |
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| 37 | /** |
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| 38 | * @var string $result |
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| 39 | */ |
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| 40 | private $result; |
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| 41 | /** |
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| 42 | * @var mixed |
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| 43 | */ |
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| 44 | private $info; |
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| 45 | |||
| 46 | /** |
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| 47 | * @Injectable |
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| 48 | * @var \PSFS\base\Logger Log de las llamadas |
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| 49 | */ |
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| 50 | protected $log; |
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| 51 | /** |
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| 52 | * @Injectable |
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| 53 | * @var \PSFS\base\Cache $cache |
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| 54 | */ |
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| 55 | protected $cache; |
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| 56 | /** |
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| 57 | * @var bool |
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| 58 | */ |
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| 59 | protected $isJson = true; |
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| 60 | |||
| 61 | 1 | private function closeConnection() { |
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| 66 | |||
| 67 | public function __destruct() |
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| 71 | |||
| 72 | /** |
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| 73 | * @return String |
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| 74 | */ |
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| 75 | public function getUrl() |
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| 79 | |||
| 80 | /** |
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| 81 | * @param String $url |
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| 82 | */ |
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| 83 | public function setUrl($url) |
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| 88 | |||
| 89 | /** |
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| 90 | * @return string |
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| 91 | */ |
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| 92 | public function getResult() |
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| 96 | |||
| 97 | /** |
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| 98 | * @param string $result |
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| 99 | */ |
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| 100 | public function setResult($result) |
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| 104 | |||
| 105 | /** |
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| 106 | * @return array |
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| 107 | */ |
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| 108 | public function getParams() |
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| 112 | |||
| 113 | /** |
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| 114 | * Add request param |
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| 115 | * |
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| 116 | * @param $key |
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| 117 | * @param null $value |
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| 118 | * |
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| 119 | * @return \PSFS\base\Service |
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| 120 | */ |
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| 121 | public function addParam($key, $value = NULL) |
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| 127 | |||
| 128 | /** |
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| 129 | * @return array |
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| 130 | */ |
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| 131 | public function getOptions() |
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| 135 | |||
| 136 | /** |
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| 137 | * Add request param |
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| 138 | * |
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| 139 | * @param $key |
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| 140 | * @param null $value |
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| 141 | * |
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| 142 | * @return \PSFS\base\Service |
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| 143 | */ |
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| 144 | public function addOption($key, $value = NULL) |
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| 150 | |||
| 151 | /** |
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| 152 | * @param array $params |
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| 153 | */ |
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| 154 | public function setParams($params) |
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| 158 | |||
| 159 | /** |
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| 160 | * @return array |
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| 161 | */ |
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| 162 | public function getHeaders() |
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| 166 | |||
| 167 | /** |
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| 168 | * @param array $headers |
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| 169 | */ |
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| 170 | public function setHeaders($headers) |
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| 174 | |||
| 175 | /** |
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| 176 | * @param $header |
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| 177 | * @param null $content |
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| 178 | * |
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| 179 | * @return $this |
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| 180 | */ |
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| 181 | public function addHeader($header, $content = NULL) |
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| 187 | |||
| 188 | /** |
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| 189 | * @return string |
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| 190 | */ |
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| 191 | public function getType() |
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| 195 | |||
| 196 | /** |
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| 197 | * @param string $type |
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| 198 | */ |
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| 199 | public function setType($type) |
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| 203 | |||
| 204 | /** |
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| 205 | * @return Logger |
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| 206 | */ |
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| 207 | public function getLog() |
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| 211 | |||
| 212 | /** |
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| 213 | * @param Logger $log |
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| 214 | */ |
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| 215 | 1 | public function setLog($log) |
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| 219 | |||
| 220 | /** |
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| 221 | * @param bool $isJson |
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| 222 | */ |
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| 223 | public function setIsJson($isJson = true) { |
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| 226 | |||
| 227 | /** |
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| 228 | * @return bool |
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| 229 | */ |
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| 230 | public function getIsJson() { |
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| 233 | |||
| 234 | /** |
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| 235 | * Método que limpia el contexto de la llamada |
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| 236 | */ |
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| 237 | 1 | private function clearContext() |
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| 245 | |||
| 246 | /** |
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| 247 | * |
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| 248 | */ |
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| 249 | 1 | public function init() |
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| 254 | |||
| 255 | /** |
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| 256 | * Initialize CURL |
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| 257 | */ |
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| 258 | private function initialize() |
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| 264 | |||
| 265 | /** |
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| 266 | * Generate auth header |
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| 267 | * @param string $secret |
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| 268 | * @param string $module |
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| 269 | */ |
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| 270 | protected function addRequestToken($secret, $module = 'PSFS') |
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| 274 | |||
| 275 | /** |
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| 276 | * @param $user |
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| 277 | * @param $pass |
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| 278 | */ |
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| 279 | protected function addAuthHeader($user, $pass) { |
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| 283 | |||
| 284 | protected function applyOptions() { |
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| 289 | |||
| 290 | protected function applyHeaders() { |
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| 299 | |||
| 300 | protected function setDefaults() |
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| 346 | |||
| 347 | public function callSrv() |
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| 371 | |||
| 372 | /** |
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| 373 | * @return mixed |
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| 374 | */ |
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| 375 | public function getCallInfo() { |
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| 378 | |||
| 379 | } |
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| 380 |
If you define a variable conditionally, it can happen that it is not defined for all execution paths.
Let’s take a look at an example:
In the above example, the variable $x is defined if you pass “foo” or “bar” as argument for $a. However, since the switch statement has no default case statement, if you pass any other value, the variable $x would be undefined.
Available Fixes
Check for existence of the variable explicitly:
Define a default value for the variable:
Add a value for the missing path: