# create one class per topic
for topic, topic_class in self.map_from_topic_to_class.items():
self.map_topic[topic] = topic_class(self.db, self.fs, self.msg)
# create one class per topic
for topic, topic_class in self.map_from_topic_to_class.items():
self.map_topic[topic] = topic_class(self.db, self.fs, self.msg)