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36 lines
1.1 KiB
Python
36 lines
1.1 KiB
Python
"""Declarative IoC container's provider injections example."""
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import sqlite3
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import collections
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import dependency_injector.containers as containers
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import dependency_injector.providers as providers
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UsersService = collections.namedtuple('UsersService', ['db'])
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AuthService = collections.namedtuple('AuthService', ['db', 'users_service'])
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class Services(containers.DeclarativeContainer):
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"""IoC container of service providers."""
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database = providers.Singleton(sqlite3.connect, ':memory:')
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users = providers.Factory(UsersService,
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db=database)
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auth = providers.Factory(AuthService,
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db=database,
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users_service=users)
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# Retrieving service providers from container:
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users_service = Services.users()
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auth_service = Services.auth()
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# Making some asserts:
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assert users_service.db is auth_service.db is Services.database()
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assert isinstance(auth_service.users_service, UsersService)
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assert users_service is not Services.users()
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assert auth_service is not Services.auth()
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