.. java:import:: rsb Event

.. java:import:: rsb RSBException

Callback
========

.. java:package:: rsb.patterns
   :noindex:

.. java:type:: public interface Callback

   A \ :java:ref:`Callback`\  implements the functionality of a single method of a \ :java:ref:`LocalServer`\ . Clients usually should not implement this interface directly. Instead use one of the specialized implementing classes like \ :java:ref:`DataCallback`\  or \ :java:ref:`EventCallback`\ .

   :author: jwienke

Methods
-------
internalInvoke
^^^^^^^^^^^^^^

.. java:method::  Event internalInvoke(Event request) throws UserCodeException, InterruptedException
   :outertype: Callback

   Method to invoke the \ :java:ref:`Callback`\ 's functionality. This method can be considered an internal implementation detail. Implementing user code must not swallow interruption state. Instead, it has to be passed to the outside world.

   :param request: the request received from a \ :java:ref:`RemoteServer`\  method call
   :throws UserCodeException: any exception in the user code invoked by the callback
   :throws InterruptedException: indicates that the called action was interrupted
   :return: an event with the result data of a method