def prepare(self):
        pass
Deletes all states in multiple flows and dequeues all client messages.
dataset/ETHPy150Open MitchellChu/torndsession/torndsession/sessionhandler.py/SessionBaseHandler.prepare--crossover with--dataset/ETHPy150Open google/grr/grr/lib/queue_manager.py/QueueManager.MultiDestroyFlowStates