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.