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https://github.com/ets-labs/python-dependency-injector.git
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44 lines
1.3 KiB
Python
44 lines
1.3 KiB
Python
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"""Declarative catalog overriding by dynamic catalog example."""
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import collections
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from dependency_injector import catalogs
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from dependency_injector import providers
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# Creating some example classes:
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Object1 = collections.namedtuple('Object1', ['arg1', 'arg2'])
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Object2 = collections.namedtuple('Object2', ['object1'])
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ExtendedObject2 = collections.namedtuple('ExtendedObject2', [])
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class Catalog(catalogs.DeclarativeCatalog):
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"""Catalog of some providers."""
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object1_factory = providers.Factory(Object1,
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arg1=1,
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arg2=2)
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""":type: providers.Provider -> Object1"""
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object2_factory = providers.Factory(Object2,
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object1=object1_factory)
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""":type: providers.Provider -> Object2"""
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# Overriding `Catalog` with some `DynamicCatalog` instance:
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overriding_catalog = catalogs.DynamicCatalog(
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object2_factory=providers.Factory(ExtendedObject2))
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Catalog.override(overriding_catalog)
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# Creating some objects using overridden catalog:
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object2_1 = Catalog.object2_factory()
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object2_2 = Catalog.object2_factory()
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# Making some asserts:
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assert Catalog.is_overridden
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assert object2_1 is not object2_2
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assert isinstance(object2_1, ExtendedObject2)
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assert isinstance(object2_2, ExtendedObject2)
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