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:
| 1 | <?php |
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| 12 | class MarathonApiClient implements ApiClientInterface |
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| 13 | { |
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| 14 | |||
| 15 | /** @var HttpClientInterface */ |
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| 16 | private $oHttpClient; |
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| 17 | |||
| 18 | 9 | public function __construct( |
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| 24 | |||
| 25 | /** |
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| 26 | * @link: https://mesos.github.io/chronos/docs/api.html#listing-jobs |
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| 27 | * @return array |
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| 28 | */ |
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| 29 | 1 | public function listingJobs() |
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| 39 | |||
| 40 | /** |
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| 41 | * @param JobEntityInterface $oJobEntity |
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| 42 | * @return bool |
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| 43 | */ |
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| 44 | 1 | public function addingJob(JobEntityInterface $oJobEntity) |
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| 51 | |||
| 52 | /** |
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| 53 | * @param JobEntityInterface|ChronosJobEntity $oJobEntity |
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| 54 | * @return bool |
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| 55 | */ |
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| 56 | 1 | public function updatingJob(JobEntityInterface $oJobEntity) |
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| 64 | |||
| 65 | /** |
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| 66 | * @param string $sJobName |
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| 67 | * @return bool |
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| 68 | */ |
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| 69 | 1 | public function removeJob($sJobName) |
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| 76 | |||
| 77 | /** |
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| 78 | * @param string $sJobName |
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| 79 | * @return array |
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| 80 | */ |
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| 81 | public function getJobStats($sJobName) |
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| 85 | |||
| 86 | /** |
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| 87 | * Returns true if the client can be connected to. |
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| 88 | * @return bool |
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| 89 | */ |
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| 90 | 5 | View Code Duplication | public function ping() |
| 106 | } |
This check looks for multiple assignments in successive lines of code. It will report an issue if the operators are not in a straight line.
To visualize
will produce issues in the first and second line, while this second example
will produce no issues.