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45 lines
1.2 KiB
Python
45 lines
1.2 KiB
Python
"""Catalog overriding example."""
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import collections
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import dependency_injector as di
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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(di.DeclarativeCatalog):
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"""Providers catalog."""
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object1_factory = di.Factory(Object1,
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arg1=1,
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arg2=2)
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""":type: di.Provider -> Object1"""
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object2_factory = di.Factory(Object2,
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object1=object1_factory)
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""":type: di.Provider -> Object2"""
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class AnotherCatalog(di.DeclarativeCatalog):
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"""Another providers catalog."""
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object2_factory = di.Factory(ExtendedObject2)
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""":type: di.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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