def call_on(self, event_type, handler, priority=0): pair = (handler, priority) logging.debug("Calling %s on %s.", format_object(handler), event_type) handlers = self._event_handlers.setdefault(event_type, []) handlers.append(pair) return EventID(event_type, pair)
def fire(self, event_type, *args, **kwargs): indent = " " * self._depth self._depth += 1 logging.debug("%sStarted firing %s.", indent, event_type) handlers = self._event_handlers.get(event_type, ()) if not handlers: logging.debug("%sNo handlers found for event type: %s", indent, event_type) results = [] handlers = sorted(handlers, key=lambda pair: pair[1]) for handler, priority in handlers: try: logging.debug("%sCalling %s for %s with priority %d.", indent, format_object(handler, *args, **kwargs), event_type, priority) results.append(handler(*args, **kwargs)) except StopException: break except StopAllException: raise except KeyboardInterrupt: logging.exception("Keyboard interrupt while running event " "handler %s for event type %r", format_object(handler, *args, **kwargs), event_type) self.stop_all() except: logging.exception("Error running event handler %s for " "event type %r", format_object(handler, *args, **kwargs), event_type) logging.debug("%sFinished firing %s.", indent, event_type) self._depth -= 1 return results