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:
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| 28 | class HistorySubscriber extends AbstractTimerSubscriber |
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| 29 | { |
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| 30 | /** |
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| 31 | * @var JournalInterface |
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| 32 | */ |
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| 33 | private $journal; |
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| 34 | |||
| 35 | /** |
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| 36 | * @param JournalInterface|null $journal |
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| 37 | * @param TimerInterface|null $timer |
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| 38 | */ |
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| 39 | 45 | public function __construct(JournalInterface $journal = null, TimerInterface $timer = null) |
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| 45 | |||
| 46 | /** |
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| 47 | * @return JournalInterface |
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| 48 | */ |
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| 49 | 18 | public function getJournal() |
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| 53 | |||
| 54 | /** |
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| 55 | * @param RequestCreatedEvent $event |
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| 56 | */ |
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| 57 | 9 | public function onRequestCreated(RequestCreatedEvent $event) |
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| 61 | |||
| 62 | /** |
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| 63 | * @param RequestSentEvent $event |
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| 64 | */ |
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| 65 | 9 | public function onRequestSent(RequestSentEvent $event) |
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| 69 | |||
| 70 | /** |
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| 71 | * @param MultiRequestCreatedEvent $event |
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| 72 | */ |
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| 73 | 9 | public function onMultiRequestCreated(MultiRequestCreatedEvent $event) |
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| 80 | |||
| 81 | /** |
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| 82 | * @param MultiRequestSentEvent $event |
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| 83 | */ |
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| 84 | 9 | View Code Duplication | public function onMultiRequestSent(MultiRequestSentEvent $event) |
| 93 | |||
| 94 | /** |
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| 95 | * {@inheritdoc} |
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| 96 | */ |
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| 97 | 9 | public static function getSubscribedEvents() |
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| 106 | |||
| 107 | /** |
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| 108 | * @param InternalRequestInterface $internalRequest |
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| 109 | * @param ResponseInterface $response |
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| 110 | * |
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| 111 | * @return InternalRequestInterface |
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| 112 | */ |
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| 113 | 18 | private function record(InternalRequestInterface $internalRequest, ResponseInterface $response) |
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| 120 | } |
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| 121 |
Unless you are absolutely sure that the expression can never be null because of other conditions, we strongly recommend to add an additional type check to your code: