def per_property_flush_actions(self, uow):
after_save = unitofwork.ProcessAll(uow, self, False, True)
before_delete = unitofwork.ProcessAll(uow, self, True, True)
parent_saves = unitofwork.SaveUpdateAll(
uow,
self.parent.primary_base_mapper
)
child_saves = unitofwork.SaveUpdateAll(
uow,
self.mapper.primary_base_mapper
)
parent_deletes = unitofwork.DeleteAll(
uow,
self.parent.primary_base_mapper
)
child_deletes = unitofwork.DeleteAll(
uow,
self.mapper.primary_base_mapper
)
self.per_property_dependencies(uow,
parent_saves,
child_saves,
parent_deletes,
child_deletes,
after_save,
before_delete
)
def per_property_flush_actions(self, uow):
parent_saves = unitofwork.SaveUpdateAll(
uow,
self.parent.base_mapper)
after_save = unitofwork.ProcessAll(uow, self, False, False)
uow.dependencies.update([
(parent_saves, after_save)
])
def per_state_flush_actions(self, uow, states, isdelete):
"""establish actions and dependencies related to a flush.
These actions will operate on all relevant states
individually. This occurs only if there are cycles
in the 'aggregated' version of events.
"""
parent_base_mapper = self.parent.primary_base_mapper
child_base_mapper = self.mapper.primary_base_mapper
child_saves = unitofwork.SaveUpdateAll(uow, child_base_mapper)
child_deletes = unitofwork.DeleteAll(uow, child_base_mapper)
# locate and disable the aggregate processors
# for this dependency
if isdelete:
before_delete = unitofwork.ProcessAll(uow, self, True, True)
before_delete.disabled = True
else:
after_save = unitofwork.ProcessAll(uow, self, False, True)
after_save.disabled = True
# check if the "child" side is part of the cycle
if child_saves not in uow.cycles:
# based on the current dependencies we use, the saves/
# deletes should always be in the 'cycles' collection
# together. if this changes, we will have to break up
# this method a bit more.
assert child_deletes not in uow.cycles
# child side is not part of the cycle, so we will link per-state
# actions to the aggregate "saves", "deletes" actions
child_actions = [(child_saves, False), (child_deletes, True)]
child_in_cycles = False
else:
child_in_cycles = True
# check if the "parent" side is part of the cycle
if not isdelete:
parent_saves = unitofwork.SaveUpdateAll(uow,
self.parent.base_mapper)
parent_deletes = before_delete = None
if parent_saves in uow.cycles:
parent_in_cycles = True
else:
parent_deletes = unitofwork.DeleteAll(uow, self.parent.base_mapper)
parent_saves = after_save = None
if parent_deletes in uow.cycles:
parent_in_cycles = True
# now create actions /dependencies for each state.
for state in states:
# detect if there's anything changed or loaded
# by a preprocessor on this state/attribute. if not,
# we should be able to skip it entirely.
sum_ = uow.get_attribute_history(state, self.key,
passive=True).sum()
if not sum_:
continue
if isdelete:
before_delete = unitofwork.ProcessState(uow, self, True, state)
if parent_in_cycles:
parent_deletes = unitofwork.DeleteState(
uow, state, parent_base_mapper)
else:
after_save = unitofwork.ProcessState(uow, self, False, state)
if parent_in_cycles:
parent_saves = unitofwork.SaveUpdateState(
uow, state, parent_base_mapper)
if child_in_cycles:
child_actions = []
for child_state in sum_:
if child_state is None:
continue
if child_state not in uow.states:
child_action = (None, None)
else:
(deleted, listonly) = uow.states[child_state]
if deleted:
child_action = (unitofwork.DeleteState(
uow, child_state, child_base_mapper), True)
else:
child_action = (unitofwork.SaveUpdateState(
uow, child_state, child_base_mapper), False)
child_actions.append(child_action)
# establish dependencies between our possibly per-state
# parent action and our possibly per-state child action.
for child_action, childisdelete in child_actions:
self.per_state_dependencies(uow, parent_saves, parent_deletes,
child_action, after_save,
before_delete, isdelete,
childisdelete)
