def test_cache_raises_aggregate_not_found_when_projector_func_returns_none(
self):
transcoder = JSONTranscoder()
transcoder.register(UUIDAsHex())
transcoder.register(DecimalAsStr())
transcoder.register(DatetimeAsISO())
transcoder.register(EmailAddressAsStr())
event_recorder = SQLiteAggregateRecorder(SQLiteDatastore(":memory:"))
event_recorder.create_table()
event_store = EventStore(
mapper=Mapper(transcoder=transcoder),
recorder=event_recorder,
)
repository = Repository(
event_store,
cache_maxsize=2,
)
aggregate = Aggregate()
event_store.put(aggregate.collect_events())
self.assertEqual(1, repository.get(aggregate.id).version)
aggregate.trigger_event(Aggregate.Event)
event_store.put(aggregate.collect_events())
with self.assertRaises(AggregateNotFound):
repository.get(aggregate.id, projector_func=lambda _, __: None)
def test_cache_fastforward_false(self):
transcoder = JSONTranscoder()
transcoder.register(UUIDAsHex())
transcoder.register(DecimalAsStr())
transcoder.register(DatetimeAsISO())
transcoder.register(EmailAddressAsStr())
event_recorder = SQLiteAggregateRecorder(SQLiteDatastore(":memory:"))
event_recorder.create_table()
event_store = EventStore(
mapper=Mapper(transcoder=transcoder),
recorder=event_recorder,
)
repository = Repository(
event_store,
cache_maxsize=2,
fastforward=False,
)
aggregate = Aggregate()
event_store.put(aggregate.collect_events())
self.assertEqual(1, repository.get(aggregate.id).version)
aggregate.trigger_event(Aggregate.Event)
event_store.put(aggregate.collect_events())
self.assertEqual(1, repository.get(aggregate.id).version)
def test_trigger_event(self):
a = Aggregate()
# Check the aggregate can trigger further events.
a.trigger_event(AggregateEvent)
self.assertLess(a.created_on, a.modified_on)
pending = a.collect_events()
self.assertEqual(len(pending), 2)
self.assertIsInstance(pending[0], AggregateCreated)
self.assertEqual(pending[0].originator_version, 1)
self.assertIsInstance(pending[1], AggregateEvent)
self.assertEqual(pending[1].originator_version, 2)
def test_repr_baseclass(self):
a = Aggregate()
expect = (f"Aggregate(id={a.id!r}, "
"version=1, "
f"created_on={a.created_on!r}, "
f"modified_on={a.modified_on!r}"
")")
self.assertEqual(expect, repr(a))
a.trigger_event(AggregateEvent)
expect = (f"Aggregate(id={a.id!r}, "
"version=2, "
f"created_on={a.created_on!r}, "
f"modified_on={a.modified_on!r}"
")")
self.assertEqual(expect, repr(a))
def test_cache_maxsize_nonzero(self):
transcoder = JSONTranscoder()
transcoder.register(UUIDAsHex())
transcoder.register(DecimalAsStr())
transcoder.register(DatetimeAsISO())
transcoder.register(EmailAddressAsStr())
event_recorder = SQLiteAggregateRecorder(SQLiteDatastore(":memory:"))
event_recorder.create_table()
event_store = EventStore(
mapper=Mapper(transcoder=transcoder),
recorder=event_recorder,
)
repository = Repository(event_store, cache_maxsize=2)
self.assertEqual(type(repository.cache), LRUCache)
aggregate1 = Aggregate()
self.assertFalse(aggregate1.id in repository)
event_store.put(aggregate1.collect_events())
self.assertTrue(aggregate1.id in repository)
aggregate2 = Aggregate()
self.assertFalse(aggregate2.id in repository)
event_store.put(aggregate2.collect_events())
self.assertTrue(aggregate2.id in repository)
aggregate3 = Aggregate()
self.assertFalse(aggregate3.id in repository)
event_store.put(aggregate3.collect_events())
self.assertTrue(aggregate3.id in repository)
self.assertFalse(aggregate1.id in repository.cache.cache)
self.assertEqual(1, repository.get(aggregate1.id).version)
self.assertEqual(1, repository.get(aggregate2.id).version)
self.assertEqual(1, repository.get(aggregate3.id).version)
aggregate1.trigger_event(Aggregate.Event)
event_store.put(aggregate1.collect_events())
self.assertEqual(2, repository.get(aggregate1.id).version)
def test(self):
app = BankAccountsWithAutomaticSnapshotting()
# Check snapshotting is enabled by setting snapshotting_intervals only.
self.assertTrue(app.snapshots)
# Open an account.
account_id = app.open_account("Alice", "*****@*****.**")
# Check there are no snapshots.
snapshots = list(app.snapshots.get(account_id))
self.assertEqual(len(snapshots), 0)
# Trigger twelve more events.
for _ in range(12):
app.credit_account(account_id, Decimal("10.00"))
# Check the account is at version 13.
account = app.get_account(account_id)
self.assertEqual(account.version, 13)
# Check snapshots have been taken at regular intervals.
snapshots = list(app.snapshots.get(account_id))
self.assertEqual(len(snapshots), 2)
self.assertEqual(snapshots[0].originator_version, 5)
self.assertEqual(snapshots[1].originator_version, 10)
# Check another type of aggregate is not snapshotted.
aggregate = Aggregate()
for _ in range(10):
aggregate.trigger_event(Aggregate.Event)
app.save(aggregate)
# Check snapshots have not been taken at regular intervals.
snapshots = list(app.snapshots.get(aggregate.id))
self.assertEqual(len(snapshots), 0)