def take_snapshot(entity, timestamp=None):
# Make the 'stored entity ID' for the entity, it is used as the Snapshot 'entity ID'.
# Create the snapshot event.
snapshot = Snapshot(
entity_id=entity.id,
timestamp=timestamp,
topic=topic_from_domain_class(entity.__class__),
# Todo: This should be a deepcopy.
state=entity.__dict__.copy(),
)
publish(snapshot)
# Return the event.
return snapshot
def take_snapshot(entity, at_event_id):
# Make the 'stored entity ID' for the entity, it is used as the Snapshot 'entity ID'.
id_prefix = id_prefix_from_entity(entity)
stored_entity_id = make_stored_entity_id(id_prefix, entity.id)
# Create the snapshot event.
snapshot = Snapshot(
entity_id=stored_entity_id,
domain_event_id=at_event_id,
topic=topic_from_domain_class(entity.__class__),
attrs=entity.__dict__.copy(),
)
publish(snapshot)
# Return the event.
return snapshot
def take_snapshot(self, entity_id, entity, last_event_version):
"""
Takes a snapshot by instantiating and publishing a Snapshot domain event.
:rtype: Snapshot
"""
# Create the snapshot event.
snapshot = Snapshot(
originator_id=entity_id,
originator_version=last_event_version,
topic=get_topic(entity.__class__),
state=None if entity is None else deepcopy(entity.__dict__))
# Publish the snapshot event.
publish(snapshot)
# Return the snapshot event.
return snapshot
def take_snapshot(self, entity_id, entity, last_event_version):
"""
Creates a Snapshot from the given state, and appends it
to the snapshot store.
:rtype: Snapshot
"""
# Create the snapshot.
snapshot = Snapshot(
originator_id=entity_id,
originator_version=last_event_version,
topic=get_topic(entity.__class__),
state=None if entity is None else deepcopy(entity.__dict__)
)
self.snapshot_store.store(snapshot)
# Return the snapshot.
return snapshot