shep/shep/persist.py

49 lines
1.1 KiB
Python

# local imports
from .state import State
class PersistedState(State):
def __init__(self, factory, bits, logger=None):
super(PersistedState, self).__init__(bits, logger=logger)
self.__store_factory = factory
self.__stores = {}
def __ensure_store(self, k):
if self.__stores.get(k) == None:
self.__stores[k] = self.__store_factory(k)
def put(self, item, state=None):
k = self.name(state)
self.__ensure_store(k)
self.__stores[k].add(item)
super(PersistedState, self).put(item, state=state)
def move(self, item, to_state):
k_to = self.name(to_state)
from_state = self.state(item)
k_from = self.name(from_state)
self.__ensure_store(k_to)
self.__ensure_store(k_from)
self.__stores[k_to].add(item)
self.__stores[k_from].remove(item)
super(PersistedState, self).move(item, to_state)
def purge(self, item):
state = self.state(item)
k = self.name(state)
self.__ensure_store(k)
self.__stores[k].remove(item)
super(PersistedState, self).purge(item)