<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def dump(self):
 """Serialize the state of this subsystem into a dict. Returns: dict: The serialized state """


        walker = self.dump_walker
        if walker is not None:
            walker = walker.dump()

        state = {
            'storage': self.storage.dump(),
            'dump_walker': walker,
            'next_id': self.next_id
        }

        return state