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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| 14 | class SocketServer implements SocketServerInterface, NetworkComponentAwareInterface |
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| 15 | { |
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| 16 | /** |
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| 17 | * @var SocketListenerInterface |
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| 18 | */ |
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| 19 | protected $socket; |
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| 20 | |||
| 21 | /** |
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| 22 | * @var NetworkComponentInterface |
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| 23 | */ |
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| 24 | protected $component; |
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| 25 | |||
| 26 | /** |
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| 27 | * @param NetworkComponentInterface $component |
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| 28 | * @param SocketListenerInterface $socket |
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| 29 | */ |
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| 30 | 55 | public function __construct(SocketListenerInterface $socket, NetworkComponentInterface $component = null) |
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| 38 | |||
| 39 | /** |
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| 40 | * |
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| 41 | */ |
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| 42 | 15 | public function __destruct() |
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| 47 | |||
| 48 | /** |
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| 49 | * @override |
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| 50 | * @inheritDoc |
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| 51 | */ |
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| 52 | 1 | public function start() |
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| 53 | { |
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| 54 | 1 | $this->socket->start(); |
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| 55 | 1 | } |
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| 56 | |||
| 57 | /** |
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| 58 | * @override |
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| 59 | * @inheritDoc |
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| 60 | */ |
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| 61 | 3 | public function stop() |
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| 62 | { |
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| 63 | 3 | $this->socket->close(); |
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| 64 | 3 | } |
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| 65 | |||
| 66 | /** |
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| 67 | * @override |
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| 68 | * @inheritDoc |
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| 69 | */ |
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| 70 | 24 | public function setComponent(NetworkComponentInterface $component = null) |
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| 74 | |||
| 75 | /** |
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| 76 | * @override |
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| 77 | * @inheritDoc |
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| 78 | */ |
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| 79 | 3 | public function getComponent() |
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| 83 | |||
| 84 | /** |
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| 85 | * Handler triggered when a new connection is received from SocketListener. |
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| 86 | * |
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| 87 | * @param SocketListenerInterface $server |
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| 88 | * @param SocketInterface $socket |
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| 89 | */ |
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| 90 | 7 | public function handleConnect($server, $socket) |
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| 111 | |||
| 112 | /** |
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| 113 | * Handler triggered when an existing connection is being closed. |
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| 114 | * |
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| 115 | * @param SocketInterface $socket |
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| 116 | */ |
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| 117 | 6 | View Code Duplication | public function handleDisconnect($socket) |
| 134 | |||
| 135 | /** |
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| 136 | * Handler triggered when a new data is received from existing connection. |
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| 137 | * |
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| 138 | * @param SocketInterface $socket |
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| 139 | * @param mixed $data |
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| 140 | */ |
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| 141 | 6 | public function handleData($socket, $data) |
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| 156 | |||
| 157 | /** |
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| 158 | * Handler triggered when an error has occured during doing operation on existing connection. |
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| 159 | * |
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| 160 | * @param SocketInterface $socket |
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| 161 | * @param Error|Exception $ex |
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| 162 | */ |
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| 163 | 2 | View Code Duplication | public function handleError($socket, $ex) |
| 178 | |||
| 179 | /** |
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| 180 | * Close socket. |
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| 181 | * |
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| 182 | * @param SocketInterface $socket |
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| 183 | */ |
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| 184 | 1 | protected function close(SocketInterface $socket) |
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| 188 | } |
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| 189 |
If you access a property on an interface, you most likely code against a concrete implementation of the interface.
Available Fixes
Adding an additional type check:
Changing the type hint: