| 1 | <?php  | 
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| 16 | class CallbackHandler extends Handler  | 
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| 17 | { | 
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| 18 | /**  | 
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| 19 | * @var callable  | 
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| 20 | */  | 
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| 21 | protected $callable;  | 
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| 22 | |||
| 23 | /**  | 
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| 24 | * @throws InvalidArgumentException If argument is not callable  | 
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| 25 | * @param callable $callable  | 
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| 26 | */  | 
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| 27 | 1 | public function __construct($callable)  | 
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| 28 |     { | 
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| 29 | 1 |         if (!is_callable($callable)) { | 
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| 30 | throw new InvalidArgumentException(  | 
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| 31 | 'Argument to ' . __METHOD__ . ' must be valid callable'  | 
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| 32 | );  | 
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| 33 | }  | 
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| 34 | |||
| 35 | 1 | $this->callable = $callable;  | 
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| 36 | 1 | }  | 
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| 37 | |||
| 38 | /**  | 
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| 39 | * @return int|null  | 
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| 40 | */  | 
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| 41 | 1 | public function handle()  | 
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| 52 | }  | 
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| 53 |