Listener
========

.. java:package:: ch.epfl.leb.sass.logging
   :noindex:

.. java:type:: public interface Listener

   Defines common methods for listeners, i.e. objects that track \ :java:ref:`Observables <ch.epfl.leb.sass.logging.Observable>`\ .

   :author: Kyle M. Douglass

Methods
-------
update
^^^^^^

.. java:method:: public void update(Object data) throws WrongMessageTypeException
   :outertype: Listener

   This method is called by an Observable when its state has changed.

   :param data: The data object that is passed from the Observable.