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<?php |
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/** |
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* @Author : a.zinovyev |
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* @Package: emittr |
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* @License: http://www.opensource.org/licenses/mit-license.php |
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*/ |
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namespace xobotyi\emittr; |
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final class EventEmitterGlobal implements Interfaces\EventEmitterGlobal |
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{ |
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/** |
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* @var \xobotyi\emittr\EventEmitterGlobal; |
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*/ |
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private static $instance; |
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private $listeners; |
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private $maxListenersCount = 10; |
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public static function getInstance() :self { |
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if (!self::$instance) { |
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self::$instance = new self(); |
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} |
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return self::$instance; |
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} |
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public static function propagateEvent(Event $event, array &$eventsListeners) :bool { |
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$eventName = $event->getEventName(); |
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if (empty($eventsListeners[$eventName])) { |
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return true; |
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} |
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$listeners = &$eventsListeners[$eventName]; |
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$result = true; |
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foreach ($listeners as $key => &$listener) { |
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if (in_array($eventName, [EventEmitter::EVENT_LISTENER_ADDED, EventEmitter::EVENT_LISTENER_REMOVED,]) && |
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$event->getPayload()['callback'] && $event->getPayload()['callback'] === $listener[1]) { |
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continue; |
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} |
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call_user_func($listener[1], $event); |
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if ($listener[0]) { |
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unset($listeners[$key]); |
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} |
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if (!$event->isPropagatable()) { |
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$result = false; |
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break; |
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} |
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} |
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if (empty($listeners)) { |
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unset($listeners); |
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} |
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return $result; |
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} |
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public static function isValidCallback($callback) :bool { |
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return is_string($callback) || is_callable($callback) || (is_array($callback) && count($callback) === 2 && is_string($callback[0]) && is_string($callback[1])); |
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} |
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public static function storeCallback(array &$arrayToStore, string $eventName, $callback, int $maxListeners = 10, bool $once = false, bool $prepend = false) :void { |
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if (!self::isValidCallback($callback)) { |
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throw new Exception\EventEmitter("Event callback has to be a callable or an array of two elements representing classname and method to call"); |
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} |
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if (!empty($arrayToStore[$eventName]) && $maxListeners && count($arrayToStore[$eventName]) >= $maxListeners) { |
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throw new Exception\EventEmitter("Maximum amount of listeners reached for event " . $eventName); |
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} |
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if (empty($arrayToStore[$eventName])) { |
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$arrayToStore[$eventName] = []; |
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} |
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$prepend |
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? array_unshift($arrayToStore[$eventName], [$once, $callback]) |
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: $arrayToStore[$eventName][] = [$once, $callback]; |
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} |
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public function on(string $className, string $eventName, $callback) :self { |
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if (!isset($this->listeners[$className][$eventName])) { |
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$this->listeners[$className][$eventName] = []; |
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} |
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self::storeCallback($this->listeners[$className], $eventName, $callback, $this->maxListenersCount, false, false); |
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return $this; |
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} |
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public function once(string $className, string $eventName, $callback) :self { |
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if (!isset($this->listeners[$className][$eventName])) { |
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$this->listeners[$className][$eventName] = []; |
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} |
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self::storeCallback($this->listeners[$className], $eventName, $callback, $this->maxListenersCount, true, false); |
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return $this; |
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} |
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public function prependListener(string $className, string $eventName, $callback) :self { |
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if (!isset($this->listeners[$className][$eventName])) { |
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$this->listeners[$className][$eventName] = []; |
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} |
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self::storeCallback($this->listeners[$className], $eventName, $callback, $this->maxListenersCount, false, true); |
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return $this; |
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} |
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public function prependOnceListener(string $className, string $eventName, $callback) :self { |
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if (!isset($this->listeners[$className][$eventName])) { |
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$this->listeners[$className][$eventName] = []; |
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} |
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self::storeCallback($this->listeners[$className], $eventName, $callback, $this->maxListenersCount, true, true); |
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return $this; |
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} |
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public function off(string $className, string $eventName, $callback) :self { |
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if (empty($this->listeners[$className][$eventName])) { |
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return $this; |
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} |
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$this->listeners[$className][$eventName] = \array_values(\array_filter($this->listeners[$className][$eventName], function ($item) use (&$callback) { return $item[1] !== $callback; })); |
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if (empty($this->listeners[$className][$eventName])) { |
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unset($this->listeners[$className][$eventName]); |
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} |
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if (empty($this->listeners[$className])) { |
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unset($this->listeners[$className]); |
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} |
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return $this; |
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} |
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public function removeAllListeners(?string $className = null, ?string $eventName = null) :self { |
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if ($className === null) { |
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$this->listeners = []; |
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return $this; |
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} |
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if (empty($this->listeners[$className])) { |
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return $this; |
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} |
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if ($eventName === null) { |
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unset($this->listeners[$className]); |
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return $this; |
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} |
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if (empty($this->listeners[$className][$eventName])) { |
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return $this; |
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} |
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unset($this->listeners[$className][$eventName]); |
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if (empty($this->listeners[$className])) { |
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unset($this->listeners[$className]); |
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} |
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return $this; |
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} |
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public function getEventNames(string $className) :array { |
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return empty($this->listeners[$className]) ? [] : \array_keys($this->listeners[$className]); |
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} |
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public function getListeners(?string $className = null, ?string $eventName = null) :array { |
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return $className ? $eventName ? $this->listeners[$className][$eventName] ?? [] : $this->listeners[$className] ?? [] : $this->listeners; |
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} |
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public function getMaxListenersCount() :int { |
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return $this->maxListenersCount; |
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} |
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public function setMaxListenersCount(int $maxListenersCount) :self { |
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if ($maxListenersCount < 0) { |
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throw new \InvalidArgumentException('Listeners count must be greater or equal 0, got ' . $maxListenersCount); |
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} |
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$this->maxListenersCount = $maxListenersCount; |
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return $this; |
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} |
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public function propagateEventGlobal(Event $event) :bool { |
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if (substr($event->getSourceClass(), 0, 15) === 'class@anonymous') { |
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return true; |
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} |
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if (empty($this->listeners[$event->getSourceClass()])) { |
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return true; |
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} |
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return self::propagateEvent($event, $this->listeners[$event->getSourceClass()]); |
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} |
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} |