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<?php |
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/** |
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* This file is part of the Shieldon package. |
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* |
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* (c) Terry L. <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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* |
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* php version 7.1.0 |
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* |
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* @category Web-security |
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* @package Shieldon |
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* @author Terry Lin <[email protected]> |
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* @copyright 2019 terrylinooo |
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* @license https://github.com/terrylinooo/shieldon/blob/2.x/LICENSE MIT |
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* @link https://github.com/terrylinooo/shieldon |
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* @see https://shieldon.io |
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*/ |
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declare(strict_types=1); |
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namespace Shieldon\Firewall; |
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/** |
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* This is just a simple event dispatcher for Shieldon firewall. |
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*/ |
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class EventDispatcher |
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{ |
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/** |
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* Singleton pattern based instance. |
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* |
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* @var self|null |
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*/ |
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public static $instance; |
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/** |
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* The collection of events. |
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* |
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* @var array|null |
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*/ |
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public static $events; |
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/** |
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* Constructer. |
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*/ |
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private function __construct() |
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{ |
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self::$instance = null; |
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self::$events = []; |
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} |
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/** |
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* Singleton. |
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* |
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* @return self |
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*/ |
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public static function instance(): self |
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{ |
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if (!self::$instance) { |
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self::$instance = new EventDispatcher(); |
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} |
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return self::$instance; |
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} |
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/** |
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* Add a listener. |
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* |
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* @param string $name The name of an event. |
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* @param string|array $func Callable function or class. |
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* @param int $priority The execution priority. |
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* |
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* @return bool |
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*/ |
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public function addListener($name, $func, $priority = 10) |
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{ |
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// The priority postion has been taken. |
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if (isset(self::$events[$name][$priority])) { |
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return false; |
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} |
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// $func should be a function name or a callable function. |
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self::$events[$name][$priority] = $func; |
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// Or, it is an array contains Class and method name. |
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if (is_array($func)) { |
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self::$events[$name][$priority] = [ |
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$func[0], |
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$func[1], |
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]; |
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} |
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return true; |
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} |
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/** |
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* Execute the listener. |
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* |
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* @param string $name The name of an event. |
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* @param array $args The arguments. |
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* |
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* @return mixed |
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*/ |
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public function doDispatch(string $name, $args = []) |
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{ |
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if (!isset(self::$events[$name])) { |
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return; |
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} |
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$return = null; |
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ksort(self::$events[$name]); |
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foreach (self::$events[$name] as $action) { |
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if (is_string($action) && function_exists($action)) { |
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$return = call_user_func_array( |
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$action, // Callable function. |
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$args |
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); |
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} elseif (is_array($action)) { |
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$return = call_user_func_array( |
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[ |
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$action[0], // Class. |
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$action[1], // The method of that class. |
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], |
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$args |
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); |
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} elseif (is_callable($action)) { |
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$return = $action($args); |
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} |
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} |
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return $return; |
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} |
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} |
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terrylinooo /
shieldon
