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 DNDeployment 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 DNDeployment, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 18 | class DNDeployment extends DataObject implements Finite\StatefulInterface, HasStateMachine { |
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| 19 | |||
| 20 | const STATE_NEW = 'New'; |
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| 21 | const STATE_SUBMITTED = 'Submitted'; |
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| 22 | const STATE_INVALID = 'Invalid'; |
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| 23 | const STATE_QUEUED = 'Queued'; |
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| 24 | const STATE_DEPLOYING = 'Deploying'; |
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| 25 | const STATE_ABORTING = 'Aborting'; |
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| 26 | const STATE_COMPLETED = 'Completed'; |
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| 27 | const STATE_FAILED = 'Failed'; |
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| 28 | |||
| 29 | const TR_SUBMIT = 'submit'; |
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| 30 | const TR_INVALIDATE = 'invalidate'; |
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| 31 | const TR_QUEUE = 'queue'; |
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| 32 | const TR_DEPLOY = 'deploy'; |
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| 33 | const TR_ABORT = 'abort'; |
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| 34 | const TR_COMPLETE = 'complete'; |
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| 35 | const TR_FAIL = 'fail'; |
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| 36 | |||
| 37 | /** |
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| 38 | * @var array |
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| 39 | */ |
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| 40 | private static $db = array( |
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| 41 | "SHA" => "GitSHA", |
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| 42 | "ResqueToken" => "Varchar(255)", |
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| 43 | // The branch that was used to deploy this. Can't really be inferred from Git history because |
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| 44 | // the commit could appear in lots of branches that are irrelevant to the user when it comes |
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| 45 | // to deployment history, and the branch may have been deleted. |
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| 46 | "Branch" => "Varchar(255)", |
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| 47 | // is it a branch, tag etc, see GitDispatcher REF_TYPE_* constants |
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| 48 | "RefType" => "Int", |
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| 49 | "State" => "Enum('New, Submitted, Invalid, Queued, Deploying, Aborting, Completed, Failed', 'New')", |
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| 50 | // JSON serialised DeploymentStrategy. |
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| 51 | "Strategy" => "Text", |
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| 52 | "Summary" => "Text", |
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| 53 | // the date and time the deploy was queued |
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| 54 | "DeployStarted" => "SS_Datetime", |
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| 55 | "DeployRequested" => "SS_Datetime" |
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| 56 | ); |
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| 57 | |||
| 58 | /** |
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| 59 | * @var array |
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| 60 | */ |
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| 61 | private static $has_one = array( |
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| 62 | "Environment" => "DNEnvironment", |
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| 63 | "Deployer" => "Member", |
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| 64 | "Approver" => "Member", |
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| 65 | "BackupDataTransfer" => "DNDataTransfer" // denotes an automated backup done for this deployment |
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| 66 | ); |
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| 67 | |||
| 68 | private static $default_sort = '"LastEdited" DESC'; |
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| 69 | |||
| 70 | private static $dependencies = [ |
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| 71 | 'stateMachineFactory' => '%$StateMachineFactory' |
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| 72 | ]; |
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| 73 | |||
| 74 | public function getTitle() { |
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| 77 | |||
| 78 | private static $summary_fields = array( |
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| 79 | 'LastEdited' => 'Last Edited', |
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| 80 | 'SHA' => 'SHA', |
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| 81 | 'State' => 'State', |
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| 82 | 'Deployer.Name' => 'Deployer' |
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| 83 | ); |
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| 84 | |||
| 85 | public function setResqueToken($token) { |
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| 88 | |||
| 89 | public function getFiniteState() { |
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| 92 | |||
| 93 | public function setFiniteState($state) { |
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| 97 | |||
| 98 | public function getStatus() { |
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| 101 | |||
| 102 | public function getMachine() { |
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| 105 | |||
| 106 | public function Link() { |
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| 109 | |||
| 110 | public function LogLink() { |
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| 113 | |||
| 114 | public function canView($member = null) { |
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| 117 | |||
| 118 | /** |
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| 119 | * Return a path to the log file. |
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| 120 | * @return string |
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| 121 | */ |
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| 122 | protected function logfile() { |
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| 129 | |||
| 130 | /** |
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| 131 | * @return DeploynautLogFile |
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| 132 | */ |
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| 133 | public function log() { |
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| 136 | |||
| 137 | public function LogContent() { |
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| 140 | |||
| 141 | /** |
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| 142 | * This remains here for backwards compatibility - we don't want to expose Resque status in here. |
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| 143 | * Resque job (DeployJob) will change statuses as part of its execution. |
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| 144 | * |
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| 145 | * @return string |
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| 146 | */ |
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| 147 | public function ResqueStatus() { |
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| 150 | |||
| 151 | /** |
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| 152 | * Fetch the git repository |
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| 153 | * |
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| 154 | * @return \Gitonomy\Git\Repository|null |
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| 155 | */ |
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| 156 | public function getRepository() { |
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| 162 | |||
| 163 | /** |
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| 164 | * Gets the commit from source. The result is cached upstream in Repository. |
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| 165 | * |
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| 166 | * @return \Gitonomy\Git\Commit|null |
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| 167 | */ |
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| 168 | View Code Duplication | public function getCommit() { |
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| 169 | $repo = $this->getRepository(); |
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| 170 | if($repo) { |
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| 171 | try { |
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| 172 | return $this->Environment()->getCommit($this->SHA); |
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| 173 | } catch(Gitonomy\Git\Exception\ReferenceNotFoundException $ex) { |
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| 174 | return null; |
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| 175 | } |
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| 176 | } |
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| 177 | |||
| 178 | return null; |
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| 179 | } |
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| 180 | |||
| 181 | /** |
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| 182 | * Get the commit URL to the commit associated with this deployment. |
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| 183 | * @return null|string |
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| 184 | */ |
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| 185 | public function getCommitURL() { |
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| 200 | |||
| 201 | /** |
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| 202 | * Gets the commit message. |
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| 203 | * |
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| 204 | * @return string|null |
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| 205 | */ |
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| 206 | View Code Duplication | public function getCommitMessage() { |
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| 217 | |||
| 218 | /** |
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| 219 | * Return all tags for the deployed commit. |
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| 220 | * |
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| 221 | * @return ArrayList |
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| 222 | */ |
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| 223 | public function getTags() { |
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| 236 | |||
| 237 | /** |
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| 238 | * Collate the list of additional flags to affix to this deployment. |
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| 239 | * Elements of the array will be rendered literally. |
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| 240 | * |
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| 241 | * @return ArrayList |
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| 242 | */ |
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| 243 | public function getFullDeployMessages() { |
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| 270 | |||
| 271 | /** |
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| 272 | * Fetches the latest tag for the deployed commit |
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| 273 | * |
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| 274 | * @return \Varchar|null |
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| 275 | */ |
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| 276 | public function getTag() { |
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| 283 | |||
| 284 | /** |
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| 285 | * @return DeploymentStrategy |
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| 286 | */ |
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| 287 | public function getDeploymentStrategy() { |
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| 293 | |||
| 294 | /** |
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| 295 | * Return a list of things that are going to be deployed, such |
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| 296 | * as the code version, and any infrastructural changes. |
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| 297 | * |
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| 298 | * @return ArrayList |
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| 299 | */ |
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| 300 | public function getChanges() { |
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| 326 | |||
| 327 | /** |
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| 328 | * Start a resque job for this deployment |
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| 329 | * |
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| 330 | * @return string Resque token |
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| 331 | */ |
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| 332 | public function enqueueDeployment() { |
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| 371 | |||
| 372 | public function getSigFile() { |
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| 384 | |||
| 385 | /** |
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| 386 | * Signal the worker to self-abort. If we had a reliable way of figuring out the right PID, |
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| 387 | * we could posix_kill directly, but Resque seems to not provide a way to find out the PID |
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| 388 | * from the job nor worker. |
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| 389 | */ |
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| 390 | public function setSignal($signal) { |
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| 395 | } |
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| 396 |
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.