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Events.php
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Editing: Events.php
<?php /** * This file is part of CodeIgniter 4 framework. * * (c) CodeIgniter Foundation <admin@codeigniter.com> * * For the full copyright and license information, please view * the LICENSE file that was distributed with this source code. */ namespace CodeIgniter\Events; use Config\Modules; use Config\Services; define('EVENT_PRIORITY_LOW', 200); define('EVENT_PRIORITY_NORMAL', 100); define('EVENT_PRIORITY_HIGH', 10); /** * Events */ class Events { /** * The list of listeners. * * @var array */ protected static $listeners = []; /** * Flag to let us know if we've read from the Config file(s) * and have all of the defined events. * * @var bool */ protected static $initialized = false; /** * If true, events will not actually be fired. * Useful during testing. * * @var bool */ protected static $simulate = false; /** * Stores information about the events * for display in the debug toolbar. * * @var array<array<string, float|string>> */ protected static $performanceLog = []; /** * A list of found files. * * @var string[] */ protected static $files = []; /** * Ensures that we have a events file ready. */ public static function initialize() { // Don't overwrite anything.... if (static::$initialized) { return; } /** @var Modules $config */ $config = config('Modules'); $events = APPPATH . 'Config' . DIRECTORY_SEPARATOR . 'Events.php'; $files = []; if ($config->shouldDiscover('events')) { $files = Services::locator()->search('Config/Events.php'); } $files = array_filter(array_map(static function (string $file) { if (is_file($file)) { return realpath($file) ?: $file; } return false; // @codeCoverageIgnore }, $files)); static::$files = array_unique(array_merge($files, [$events])); foreach (static::$files as $file) { include $file; } static::$initialized = true; } /** * Registers an action to happen on an event. The action can be any sort * of callable: * * Events::on('create', 'myFunction'); // procedural function * Events::on('create', ['myClass', 'myMethod']); // Class::method * Events::on('create', [$myInstance, 'myMethod']); // Method on an existing instance * Events::on('create', function() {}); // Closure * * @param string $eventName * @param callable $callback * @param int $priority */ public static function on($eventName, $callback, $priority = EVENT_PRIORITY_NORMAL) { if (! isset(static::$listeners[$eventName])) { static::$listeners[$eventName] = [ true, // If there's only 1 item, it's sorted. [$priority], [$callback], ]; } else { static::$listeners[$eventName][0] = false; // Not sorted static::$listeners[$eventName][1][] = $priority; static::$listeners[$eventName][2][] = $callback; } } /** * Runs through all subscribed methods running them one at a time, * until either: * a) All subscribers have finished or * b) a method returns false, at which point execution of subscribers stops. * * @param string $eventName * @param mixed $arguments */ public static function trigger($eventName, ...$arguments): bool { // Read in our Config/Events file so that we have them all! if (! static::$initialized) { static::initialize(); } $listeners = static::listeners($eventName); foreach ($listeners as $listener) { $start = microtime(true); $result = static::$simulate === false ? $listener(...$arguments) : true; if (CI_DEBUG) { static::$performanceLog[] = [ 'start' => $start, 'end' => microtime(true), 'event' => strtolower($eventName), ]; } if ($result === false) { return false; } } return true; } /** * Returns an array of listeners for a single event. They are * sorted by priority. * * @param string $eventName */ public static function listeners($eventName): array { if (! isset(static::$listeners[$eventName])) { return []; } // The list is not sorted if (! static::$listeners[$eventName][0]) { // Sort it! array_multisort(static::$listeners[$eventName][1], SORT_NUMERIC, static::$listeners[$eventName][2]); // Mark it as sorted already! static::$listeners[$eventName][0] = true; } return static::$listeners[$eventName][2]; } /** * Removes a single listener from an event. * * If the listener couldn't be found, returns FALSE, else TRUE if * it was removed. * * @param string $eventName */ public static function removeListener($eventName, callable $listener): bool { if (! isset(static::$listeners[$eventName])) { return false; } foreach (static::$listeners[$eventName][2] as $index => $check) { if ($check === $listener) { unset( static::$listeners[$eventName][1][$index], static::$listeners[$eventName][2][$index] ); return true; } } return false; } /** * Removes all listeners. * * If the event_name is specified, only listeners for that event will be * removed, otherwise all listeners for all events are removed. * * @param string|null $eventName */ public static function removeAllListeners($eventName = null) { if ($eventName !== null) { unset(static::$listeners[$eventName]); } else { static::$listeners = []; } } /** * Sets the path to the file that routes are read from. */ public static function setFiles(array $files) { static::$files = $files; } /** * Returns the files that were found/loaded during this request. * * @return string[] */ public function getFiles() { return static::$files; } /** * Turns simulation on or off. When on, events will not be triggered, * simply logged. Useful during testing when you don't actually want * the tests to run. */ public static function simulate(bool $choice = true) { static::$simulate = $choice; } /** * Getter for the performance log records. * * @return array<array<string, float|string>> */ public static function getPerformanceLogs() { return static::$performanceLog; } }
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