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<?php |
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declare(strict_types=1); |
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namespace Suricate; |
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class EventDispatcher extends Service |
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{ |
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/** |
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* Array of declared listeners |
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* |
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* @var array |
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*/ |
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protected $listeners = []; |
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/** |
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* Array of sorted listeners (flattened from listeners) |
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* |
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* @var array |
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*/ |
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protected $sortedListeners = []; |
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/** |
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* Configure EventDispatcher |
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* |
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* @param array $parameters |
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* @return void |
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*/ |
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public function configure($parameters = []) |
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{ |
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foreach ($parameters as $eventListenerData) { |
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if ( |
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isset($eventListenerData['event']) && |
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isset($eventListenerData['listeners']) |
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) { |
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foreach ((array) $eventListenerData['listeners'] as $listener) { |
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$listenerDefinition = explode('|', $listener); |
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$listenerName = $listenerDefinition[0]; |
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$listenerPriority = isset($listenerDefinition[1]) |
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? (int) $listenerDefinition[1] |
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: 0; |
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$this->addListener( |
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$eventListenerData['event'], |
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$listenerName, |
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$listenerPriority |
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); |
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} |
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} |
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} |
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} |
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/** |
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* Declare event listened to |
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* |
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* @param string $event One or more event to listen to |
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* @param string $listener Listener class name |
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* @param int $priority Listener priority, 0 is high priority |
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* |
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* @return void |
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*/ |
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public function addListener($event, string $listener, int $priority = 0) |
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{ |
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$eventType = is_subclass_of($event, '\Suricate\Event') |
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? $event::getEventType() |
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: $event; |
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$this->listeners[$eventType][$priority][] = $listener; |
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unset($this->sortedListeners[$eventType]); |
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} |
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/** |
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* Dispatch an event |
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* |
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* @param string|\Suricate\Event $event Event to be dispatched |
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* @param mixed $payload Optionnal event payload |
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* @return void |
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*/ |
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public function fire($event, $payload = null) |
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{ |
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$eventType = null; |
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$eventPayload = null; |
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if (is_object($event) && is_subclass_of($event, '\Suricate\Event')) { |
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$eventType = $event::getEventType(); |
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$eventPayload = $event; |
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} |
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if (is_string($event)) { |
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$eventType = $event; |
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$eventPayload = $payload; |
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} |
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if ($eventType === null) { |
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throw new \InvalidArgumentException( |
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'Event type is not a string nor Event subclass' |
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); |
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} |
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$impactedListeners = $this->getImpactedListeners($eventType); |
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foreach ($impactedListeners as $listener) { |
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Suricate::Logger()->debug( |
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sprintf( |
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'[event] Passing event type: "%s" to "%s"', |
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$eventType, |
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$listener |
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) |
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); |
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$result = with(new $listener($eventPayload))->handle(); |
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if ($result === false) { |
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Suricate::Logger()->debug( |
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sprintf( |
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'[event] stop propagation of event "%s"', |
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$eventType |
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) |
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); |
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break; |
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} |
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} |
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} |
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/** |
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* Get list of eligible listeners for an event |
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* |
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* @param string $eventType |
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* @return array |
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*/ |
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3 |
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protected function getImpactedListeners(string $eventType): array |
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{ |
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if (isset($this->sortedListeners[$eventType])) { |
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return $this->sortedListeners[$eventType]; |
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} |
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$this->sortListeners($eventType); |
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return $this->sortedListeners[$eventType]; |
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} |
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/** |
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140
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* Sort and flatten listeners list according ot priority |
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141
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* |
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* @param string $eventType event type |
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* @return void |
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144
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*/ |
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4 |
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protected function sortListeners(string $eventType) |
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{ |
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4 |
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if (isset($this->listeners[$eventType])) { |
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4 |
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$listeners = $this->listeners[$eventType]; |
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4 |
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ksort($listeners); |
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4 |
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$this->sortedListeners[$eventType] = flatten($listeners); |
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} |
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4 |
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} |
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} |
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suricate-php /
framework
