gistfile1.php

<?php

<?php

abstract class Ai1ec_Event_Callback_Abstract {    
    protected $_registry      = null;   
    protected $_registry_name = null;        
    protected $_method        = null;
	
    public function __construct( 
        Ai1ec_Object_Registry $registry, 
        $path, 
        $method 
    ) {
        $this->_registry      = $registry;
        $this->_registry_name = $path;
        $this->_method        = $method;
    }

    public function run( array $argv ) {
        return $this->_registry->dispatch( 
            $this->_registry_name, 
            $this->_method, 
            $argv 
        );
    }
}

class Ai1ec_Event_Callback_Filter extends Ai1ec_Event_Callback_Abstract {}

class Ai1ec_Event_Dispatcher {
 
    public function register(
        $hook,
        Ai1ec_Event_Callback_Abstract $entity,
        $priority = 10,
        $accepted_args = 1
    ) {
 
		if ($entity instanceof Ai1ec_Event_Callback_Filter) {
			add_filter(
				$hook,
				array( $entity, 'run' ),
				$priority,
				$accepted_args
			);
		} else {
			add_action(
				$hook,
				array( $entity, 'run' ),
				$priority,
				$accepted_args
			);		
		}
 
        return $this;
    }
}