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<?php |
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/** |
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* |
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* Copyright (c) 2010-2017 Nevraxe inc. & Marc André Audet <[email protected]>. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without modification, are |
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* permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright notice, this list of |
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* conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list |
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* of conditions and the following disclaimer in the documentation and/or other materials |
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* provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL MARC ANDRÉ "MANHIM" AUDET BE LIABLE FOR ANY |
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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namespace Cervo\Libraries; |
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use Cervo\Core as _; |
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/** |
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* Events manager for Cervo. |
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* @author Marc André Audet <[email protected]> |
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*/ |
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final class Events |
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{ |
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/** |
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* Holds all the events and their callbacks. |
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* @var array |
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*/ |
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private $events = []; |
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/** |
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* Name of the event in progress, null if there are no active events. |
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* @var string|null |
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*/ |
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private $inProgress = null; |
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/** |
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* Include all the events files that may register and/or hook to events. |
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*/ |
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public function __construct() |
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{ |
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$config = _::getLibrary('Cervo/Config'); |
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foreach (glob($config->get('Cervo/Application/Directory') . '*' . \DS . $config->get('Cervo/Application/EventsPath') . '*.php', \GLOB_NOSORT | \GLOB_NOESCAPE) as $file) { |
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$function = require $file; |
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if (is_callable($function)) { |
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$function($this); |
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} |
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} |
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} |
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/** |
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* Register a new event. |
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* |
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* @param string $name |
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* |
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* @return bool |
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*/ |
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public function register(string $name) : bool |
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{ |
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if ($this->isRegistered($name)) { |
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return false; |
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} |
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$this->events[$name] = []; |
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return true; |
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} |
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/** |
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* Check if the event exists by it's name. |
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* |
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* @param string $name |
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* |
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* @return bool |
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*/ |
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public function isRegistered(string $name) : bool |
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{ |
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return isset($this->events[$name]); |
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} |
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/** |
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* Remove an event and un-hook everything related to it. |
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* |
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* @param string $name |
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*/ |
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public function unregister(string $name) : void |
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{ |
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unset($this->events[$name]); |
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} |
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/** |
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* Hook a callable to an event. |
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* If the event is not registered, register it. |
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* |
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* @param string $name |
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* @param callable $call |
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* @param int $priority |
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* |
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* @return bool |
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*/ |
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public function hook(string $name, callable $call, int $priority = 0) : bool |
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{ |
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if (!$this->isRegistered($name)) { |
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$this->register($name); |
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} |
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$this->events[$name][] = [ |
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'call' => $call, |
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'priority' => $priority |
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]; |
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return true; |
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} |
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/** |
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* Fire an event and call all the hooked callables. |
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* |
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* @param string $name |
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* @param array $params |
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* |
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* @return bool |
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*/ |
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public function fire(string $name, array $params = []) : bool |
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{ |
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if (!is_array($params) || !$this->isRegistered($name)) { |
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return false; |
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} |
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$this->inProgress = $name; |
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usort($this->events[$name], function ($a, $b) { |
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return $a['priority'] <=> $b['priority']; |
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}); |
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foreach ($this->events[$name] as $call) { |
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call_user_func($call['call'], $name, $params); |
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} |
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$this->inProgress = null; |
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return true; |
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} |
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/** |
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* Returns the name of the event being fired, null otherwise. |
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* |
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* @return string|null |
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*/ |
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public function getInProgress() : ?string |
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{ |
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return $this->inProgress; |
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} |
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/** |
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* Returns true if an event is being fired. |
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* |
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* @return bool |
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*/ |
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public function isInProgress() : bool |
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{ |
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return $this->inProgress !== null; |
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} |
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} |
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