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<?php |
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/** |
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* Phoole (PHP7.2+) |
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* |
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* @category Library |
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* @package Phoole\Event |
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* @copyright Copyright (c) 2019 Hong Zhang |
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*/ |
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declare(strict_types=1); |
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namespace Phoole\Event; |
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use Phoole\Base\Reflect\ParameterTrait; |
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use Phoole\Base\Queue\UniquePriorityQueue; |
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use Psr\EventDispatcher\ListenerProviderInterface; |
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/** |
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* Provider |
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* |
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* @package Phoole\Event |
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*/ |
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class Provider implements ListenerProviderInterface |
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{ |
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use ParameterTrait; |
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/** |
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* event classes listened |
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* |
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* @var UniquePriorityQueue[] |
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*/ |
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protected $listened = []; |
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/** |
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* @param object $event |
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* An event for which to return the relevant listeners. |
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* @return iterable |
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* An iterable (array, iterator, or generator) of callables. Each |
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* callable MUST be type-compatible with $event. |
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*/ |
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View Code Duplication |
public function getListenersForEvent(object $event): iterable |
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{ |
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$queue = new UniquePriorityQueue(); |
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foreach ($this->listened as $class => $q) { |
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if (is_a($event, $class) && count($q)) { |
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$queue = $queue->combine($q); |
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} |
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} |
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return $queue; |
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} |
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/** |
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* Attach a listener (with default priority 50) to the provider |
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* |
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* @param callable $callable MUST be type-compatible with $event. |
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* @param int $priority range 0 - 100, 0 means lower priority |
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* @return $this |
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* @throws \RuntimeException reflection problem found |
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* @throws \InvalidArgumentException unknown type of callable found |
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*/ |
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public function attach(callable $callable, int $priority = 50) |
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{ |
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$class = $this->getEventClass($callable); |
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if (!isset($this->listened[$class])) { |
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$this->listened[$class] = new UniquePriorityQueue(); |
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} |
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$this->listened[$class]->insert($callable, $priority); |
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return $this; |
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} |
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/** |
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* Get callable's first argument EVENT class. |
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* |
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* @param callable $callable |
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* @return string classname or interface name |
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* @throws \RuntimeException reflection problem found |
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* @throws \InvalidArgumentException unknown type of callable found |
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*/ |
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protected function getEventClass(callable $callable): string |
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{ |
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try { |
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$params = $this->getCallableParameters($callable); |
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$error = 'Listener must declare one object as event'; |
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// only one parameter allowed |
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if (1 != count($params)) { |
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throw new \InvalidArgumentException($error); |
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} |
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// must be object |
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$type = $params[0]->getType()->getName(); |
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if (class_exists($type) || interface_exists($type)) { |
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return $type; |
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} |
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throw new \InvalidArgumentException($error); |
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} catch (\Throwable $e) { |
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throw new \RuntimeException($e->getMessage()); |
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} |
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} |
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} |
phoole /
event
