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 ApprovalsDispatcher 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 ApprovalsDispatcher, and based on these observations, apply Extract Interface, too.
| 1 | <?php | ||
| 3 | class ApprovalsDispatcher extends Dispatcher { | ||
| 4 | |||
| 5 | const ACTION_APPROVALS = 'approvals'; | ||
| 6 | |||
| 7 | /** | ||
| 8 | * @var array | ||
| 9 | */ | ||
| 10 | public static $allowed_actions = [ | ||
| 11 | 'approvers', | ||
| 12 | 'submit', | ||
| 13 | 'cancel', | ||
| 14 | 'approve', | ||
| 15 | 'reject' | ||
| 16 | ]; | ||
| 17 | |||
| 18 | /** | ||
| 19 | * @var \DNProject | ||
| 20 | */ | ||
| 21 | protected $project = null; | ||
| 22 | |||
| 23 | /** | ||
| 24 | * @var \DNEnvironment | ||
| 25 | */ | ||
| 26 | protected $environment = null; | ||
| 27 | |||
| 28 | /** | ||
| 29 | * @var array | ||
| 30 | */ | ||
| 31 | private static $action_types = [ | ||
| 32 | self::ACTION_APPROVALS | ||
| 33 | ]; | ||
| 34 | |||
| 35 | /** | ||
| 36 | * This is a per request cache of $this->project()->listMembers() | ||
| 37 | * | ||
| 38 | * @var null|array | ||
| 39 | */ | ||
| 40 | private static $_cache_project_members = null; | ||
| 41 | |||
| 42 | View Code Duplication | 	public function init() { | |
| 56 | |||
| 57 | /** | ||
| 58 | * @param \SS_HTTPRequest $request | ||
| 59 | * @return \SS_HTTPResponse | ||
| 60 | */ | ||
| 61 | 	public function approvers(SS_HTTPRequest $request) { | ||
| 83 | |||
| 84 | /** | ||
| 85 | * @param \SS_HTTPRequest $request | ||
| 86 | * @return \SS_HTTPResponse | ||
| 87 | */ | ||
| 88 | View Code Duplication | 	public function submit(SS_HTTPRequest $request) { | |
| 118 | |||
| 119 | /** | ||
| 120 | * @param \SS_HTTPRequest $request | ||
| 121 | * @return \SS_HTTPResponse | ||
| 122 | */ | ||
| 123 | View Code Duplication | 	public function cancel(SS_HTTPRequest $request) { | |
| 151 | |||
| 152 | /** | ||
| 153 | * @param \SS_HTTPRequest $request | ||
| 154 | * @return \SS_HTTPResponse | ||
| 155 | */ | ||
| 156 | View Code Duplication | 	public function approve(SS_HTTPRequest $request) { | |
| 185 | |||
| 186 | /** | ||
| 187 | * @param \SS_HTTPRequest $request | ||
| 188 | * @return \SS_HTTPResponse | ||
| 189 | */ | ||
| 190 | View Code Duplication | 	public function reject(SS_HTTPRequest $request) { | |
| 220 | |||
| 221 | /** | ||
| 222 | * Check if a DNDeployment exists and do permission checks on it. If there is something wrong it will return | ||
| 223 | * an APIResponse with the error, otherwise null. | ||
| 224 | * | ||
| 225 | * @param \DNDeployment $deployment | ||
| 226 | * | ||
| 227 | * @return null|SS_HTTPResponse | ||
| 228 | */ | ||
| 229 | View Code Duplication | 	protected function validateDeployment(\DNDeployment $deployment) { | |
| 241 | |||
| 242 | 	protected function canApprove(Member $member = null) { | ||
| 268 | |||
| 269 | /** | ||
| 270 | * @param string $name | ||
| 271 | * @return array | ||
| 272 | */ | ||
| 273 | 	public function getModel($name = '') { | ||
| 276 | |||
| 277 | /** | ||
| 278 | * @param string $action | ||
| 279 | * @return string | ||
| 280 | */ | ||
| 281 | 	public function Link($action = '') { | ||
| 284 | |||
| 285 | } | ||
| 286 | 
This check marks property names that have not been written in camelCase.
In camelCase names are written without any punctuation, the start of each new word being marked by a capital letter. Thus the name database connection string becomes
databaseConnectionString.