class SnapshotRecord(Model):
"""Stores snapshots in Cassandra."""
__table_name__ = 'snapshots'
_if_not_exists = True
# Sequence ID (e.g. an entity or aggregate ID).
sequence_id = columns.UUID(partition_key=True)
# Position (index) of item in sequence.
position = columns.BigInt(clustering_order='DESC', primary_key=True)
# Topic of the item (e.g. path to domain entity class).
topic = columns.Text(required=True)
# State of the entity (serialized dict, possibly encrypted).
state = columns.Text(required=True)
class IntegerSequencedItemRecord(ActiveRecord):
"""Stores integer-sequenced items in Cassandra."""
__table_name__ = 'integer_sequenced_items'
_if_not_exists = True
# Sequence ID (e.g. an entity or aggregate ID).
sequence_id = columns.UUID(partition_key=True)
# Position (index) of item in sequence.
position = columns.BigInt(clustering_order='DESC', primary_key=True)
# Topic of the item (e.g. path to domain event class).
topic = columns.Text(required=True)
# State of the item (serialized dict, possibly encrypted).
data = columns.Text(required=True)
class StoredEventRecord(Model):
"""Stores integer-sequenced items in Cassandra."""
__table_name__ = 'stored_events'
_if_not_exists = True
# Aggregate ID (e.g. an entity or aggregate ID).
originator_id = columns.UUID(partition_key=True)
# Aggregate version (index) of item in sequence.
originator_version = columns.BigInt(clustering_order='DESC',
primary_key=True)
# Topic of the item (e.g. path to domain event class).
topic = columns.Text(required=True)
# State of the item (serialized dict, possibly encrypted).
state = columns.Text(required=True)