python-dependency-injector/examples/providers/singleton_reseting.py

"""`Singleton` providers resetting example."""

from objects.providers import Singleton


class UserService(object):

    """Example class UserService."""


# Singleton provider creates new instance of specified class on first call and
# returns same instance on every next call.
users_service_provider = Singleton(UserService)

# Retrieving several UserService objects:
user_service1 = users_service_provider()
user_service2 = users_service_provider()

# Making some asserts:
assert user_service1 is user_service2
assert isinstance(user_service1, UserService)
assert isinstance(user_service2, UserService)

# Resetting of memorized instance:
users_service_provider.reset()

# Retrieving one more UserService object:
user_service3 = users_service_provider()

# Making some asserts:
assert user_service3 is not user_service1