.
*/
namespace Doctrine\Common;
/**
* Contract for classes that are potential listeners of a NotifyPropertyChanged
* implementor.
*
* @link www.doctrine-project.org
* @since 2.0
* @author Guilherme Blanco
* @author Jonathan Wage
* @author Roman Borschel
*/
interface PropertyChangedListener
{
/**
* Notifies the listener of a property change.
*
* @param object $sender The object on which the property changed.
* @param string $propertyName The name of the property that changed.
* @param mixed $oldValue The old value of the property that changed.
* @param mixed $newValue The new value of the property that changed.
*
* @return void
*/
function propertyChanged($sender, $propertyName, $oldValue, $newValue);
}