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<?php |
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namespace App\Component\Pubsub; |
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use Closure; |
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use Exception; |
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use ReflectionFunction; |
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use ReflectionParameter; |
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use App\Component\Pubsub\EventInterface; |
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/** |
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* ClosureWrapper |
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* |
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* is a mediator pattern to let closure to comply ListenerInterface. |
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*/ |
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class ClosureWrapper extends ListenerAbstract implements ListenerInterface |
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{ |
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const PHP_VER_REF = '7.1'; |
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/** |
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* listener as closure |
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* |
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* @var Closure |
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*/ |
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protected $closure; |
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/** |
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* instanciate |
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* |
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* @param Closure $closure |
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*/ |
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public function __construct(Closure $closure) |
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{ |
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$params = $this->getClosureParameters($closure); |
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if (count($params) === 0) { |
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throw new Exception(self::ERR_CLOSURE_ARG_MISSING); |
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} |
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if ($this->getArgTypeName($params[0]) !== EventInterface::class) { |
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throw new Exception(self::ERR_CLOSURE_ARG_INVALID); |
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} |
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$this->closure = $closure; |
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} |
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/** |
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* publish |
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* |
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* @param EventInterface $event |
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* @return void |
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*/ |
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public function publish(EventInterface $event) |
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{ |
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call_user_func($this->closure, $event); |
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} |
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/** |
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* return an array of reflexion parameter |
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* |
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* @see https://www.php.net/manual/fr/class.reflectionparameter.php |
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* |
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* @param Closure $closure |
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* @return ReflectionParameter[] |
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*/ |
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protected function getClosureParameters(Closure $closure): array |
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{ |
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$reflection = new ReflectionFunction($closure); |
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return $reflection->getParameters(); |
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} |
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/** |
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* return type name for a ReflectionParameter arg |
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* |
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* @param ReflectionParameter $arg |
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* @return string |
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*/ |
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protected function getArgTypeName(ReflectionParameter $arg): string |
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{ |
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return (version_compare(phpversion(), self::PHP_VER_REF, '<')) |
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? (string) $arg->getType() |
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: $arg->getType()->getName(); |
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} |
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} |
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pierre-fromager /
nymfonya
