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https://github.com/ets-labs/python-dependency-injector.git
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50 lines
1.3 KiB
Python
50 lines
1.3 KiB
Python
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"""`Catalog.override()` example."""
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from collections import namedtuple
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from objects.catalog import AbstractCatalog
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from objects.providers import Factory
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from objects.injections import KwArg
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# Creating some example classes:
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Object1 = namedtuple('Object1', ['arg1', 'arg2'])
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Object2 = namedtuple('Object2', ['object1'])
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ExtendedObject2 = namedtuple('ExtendedObject2', [])
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class Catalog(AbstractCatalog):
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"""Providers catalog."""
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object1_factory = Factory(Object1,
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KwArg('arg1', 1),
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KwArg('arg2', 2))
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""":type: (objects.Provider) -> Object1"""
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object2_factory = Factory(Object2,
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KwArg('object1', object1_factory))
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""":type: (objects.Provider) -> Object2"""
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class AnotherCatalog(AbstractCatalog):
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"""Another providers catalog."""
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object2_factory = Factory(ExtendedObject2)
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""":type: (objects.Provider) -> ExtendedObject2"""
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# Overriding `Catalog` with `AnotherCatalog`:
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Catalog.override(AnotherCatalog)
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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 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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