Laravel 5: Dynamic Events

laravel-5-dynamic-events.php

<?php

// creating new event handlers by extending Handler and
// store them in a "Handlers" directory to be read by
// the service provider, which will loop through the  
// directory and Event::subscribe to each one.

// Make sure you prefix each handler method with 
// "on" (ex: onUserRegister) as only these methods 
// will be listened for.

// base event handler
abstract class Handler {

	public function subscribe($events)
	{
		// get name of instantiated concrete class
		$class = get_called_class();
		// loop through each method of the class
		foreach(get_class_methods($class) as $method) {
			// if the method name starts with 'on'
			if(preg_match('/^on/', $method)) {
				// attach the event listener
				$events->listen($this->key($method), $class.'@'.$method);
			}
		}
	}
    
	protected function key($name)
	{
		// remove on from beginning
		$name = ltrim($name, 'on');
		// prepend uppercase letters with .
		$name = preg_replace_callback('/[A-Z]/', function($m) { return ".{$m[0]}" }, $name));
		// remove trailing .
		$name = ltrim($name, '.');
		// now that we have the dots we can lowercase the name
		$name = strtolower($name);
	}
	
}


// service provider
use Illuminate\Support\ServiceProvider;
use ReflectionClass;

class EventServiceProvider extends ServiceProvider {

	private function fullyQualifiedClassName($file)
	{
		return 'Your\Namespace\\'.str_replace('.php', '', basename($file));
	}

	public function register()
	{
		foreach($this->app['files']->files(__DIR__.'/Handlers') as $listener) {
		    $class = $this->fullyQualifiedClassName($listener);
		    if(ReflectionClass::isInstantiable($class)) {
		    	$this->app['events']->subscribe($class);
		    }
		}
	}

}