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<?php |
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namespace ByTIC\EventDispatcher\ListenerProviders; |
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use Psr\EventDispatcher\ListenerProviderInterface; |
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/** |
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* Class PriorityListenerProvider |
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* @package ByTIC\EventDispatcher\ListenerProviders |
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*/ |
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class PriorityListenerProvider implements ListenerProviderInterface |
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{ |
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use Traits\ProviderUtilitiesTrait; |
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use Traits\MakeListenerTrait; |
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protected $listenersPerEvent = []; |
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protected function getListenersForEventName(string $eventName): iterable |
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{ |
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if (!array_key_exists($eventName, $this->listenersPerEvent)) { |
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return []; |
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} |
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return $this->listenersPerEvent[$eventName]->getListeners(); |
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} |
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/** |
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* @param callable|string $listener |
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* @param int $priority |
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* @param string|null $event |
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* @return void |
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*/ |
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public function attach( |
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$listener, |
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int $priority = 0, |
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string $event = null |
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): void { |
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$listener = self::makeListener($listener); |
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$event = $event ?? $this->getParameterType($listener); |
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$this->subscribeTo($event, $listener, $priority); |
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} |
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public function subscribeTo(string $event, callable $listener, int $priority = 0): void |
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{ |
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$group = array_key_exists($event, $this->listenersPerEvent) |
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? $this->listenersPerEvent[$event] |
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: $this->listenersPerEvent[$event] = new PrioritizedListenersForEvent(); |
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$group->addListener($listener, $priority); |
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} |
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public function subscribeOnceTo(string $event, callable $listener, int $priority = ListenerPriority::NORMAL): void |
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{ |
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$this->subscribeTo($event, new OneTimeListener($listener), $priority); |
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} |
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public function getListenersForEvent(object $event): iterable |
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{ |
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/** |
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* @var string $key |
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* @var PrioritizedListenersForEvent $group |
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*/ |
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foreach ($this->listenersPerEvent as $key => $group) { |
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if ($event instanceof $key) { |
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yield from $group->getListeners(); |
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} |
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} |
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if (method_exists($event, 'eventName')) { |
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yield from $this->getListenersForEventName($event->eventName()); |
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} |
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} |
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// public function subscribeListenersFrom(ListenerSubscriber $subscriber): void |
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// { |
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// $subscriber->subscribeListeners($this); |
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// } |
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} |
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bytic /
event-dispatcher
Loading history...
Let?s assume that you have a directory layout like this:
. |-- OtherDir | |-- Bar.php | `-- Foo.php `-- SomeDir `-- Foo.phpand let?s assume the following content of
Bar.php:If both files
OtherDir/Foo.phpandSomeDir/Foo.phpare loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.phpHowever, as
OtherDir/Foo.phpdoes not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: