def test_validate_aggregate_events(self):
event1 = AggregateRoot.Created(
originator_version=0,
originator_id='1',
originator_topic=get_topic(AggregateRoot))
event1.__check_hash__()
# Chain another event.
event2 = AggregateRoot.AttributeChanged(
originator_version=1,
originator_id='1',
__previous_hash__=event1.__event_hash__)
event2.__check_hash__()
# Chain another event.
event3 = AggregateRoot.AttributeChanged(
originator_version=2,
originator_id='1',
__previous_hash__=event2.__event_hash__)
event3.__check_hash__()
def test_event_hash_error(self):
event1 = AggregateRoot.Created(
originator_version=0,
originator_id='1',
originator_topic=get_topic(AggregateRoot))
event1.__check_hash__()
# Break the hash.
event1.__dict__['event_hash'] = 'damage'
with self.assertRaises(EventHashError):
event1.__check_hash__()
def example_policy(repository, event):
if isinstance(event, ExampleAggregate.Created):
# Create a second aggregate, allowing test to check that
# events from more than one entity are stored.
second_id = uuid4()
second = AggregateRoot.__create__(originator_id=second_id)
# Get first aggregate and move it on, allowing test to
# check that the first aggregate was mutated by the policy.
first = repository[event.originator_id]
assert isinstance(first, ExampleAggregate)
first.move_on(second_id=second_id)
return second
elif isinstance(event, Command.Created):
command_class = resolve_topic(event.originator_topic)
if command_class is CreateExample:
return ExampleAggregate.__create__(event.example_id)
def example_policy(repository, event):
# Whenever an aggregate is created, then "move it on".
if isinstance(event, ExampleAggregate.Created):
# Get aggregate and move it on.
aggregate = repository[event.originator_id]
assert isinstance(aggregate, ExampleAggregate)
# Also create a second entity, allows test to check that
# events from more than one entity are stored.
second_id = uuid4()
other_entity = AggregateRoot.__create__(originator_id=second_id)
aggregate.move_on(second_id=second_id)
return other_entity
elif isinstance(event, Command.Created):
command_class = resolve_topic(event.originator_topic)
if command_class is CreateExample:
return ExampleAggregate.__create__()
def policy(repository, event):
first = AggregateRoot.__create__(originator_id=(uuid4()))
second = AggregateRoot.__create__(originator_id=(uuid4()))
return (first, second)
