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https://github.com/ets-labs/python-dependency-injector.git
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70 lines
1.4 KiB
Python
70 lines
1.4 KiB
Python
"""
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Concept example of objects overrides.
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"""
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from objects import (
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AbstractCatalog,
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overrides,
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)
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from objects.providers import (
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Singleton,
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NewInstance,
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)
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from objects.injections import (
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InitArg,
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Attribute,
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)
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import sqlite3
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# Some example class.
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class ObjectA(object):
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def __init__(self, db):
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self.db = db
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# Mock of example class.
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class ObjectAMock(ObjectA):
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pass
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# Catalog of objects providers.
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class Catalog(AbstractCatalog):
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"""
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Objects catalog.
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"""
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database = Singleton(sqlite3.Connection,
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InitArg('database', ':memory:'),
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Attribute('row_factory', sqlite3.Row))
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""" :type: (objects.Provider) -> sqlite3.Connection """
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object_a = NewInstance(ObjectA,
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InitArg('db', database))
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""" :type: (objects.Provider) -> ObjectA """
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# Overriding Catalog by SandboxCatalog with some mocks.
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@overrides(Catalog)
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class SandboxCatalog(Catalog):
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"""
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Sandbox objects catalog with some mocks.
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"""
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object_a = NewInstance(ObjectAMock,
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InitArg('db', Catalog.database))
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""" :type: (objects.Provider) -> ObjectA """
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# Catalog static provides.
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a1 = Catalog.object_a()
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a2 = Catalog.object_a()
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# Some asserts.
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assert isinstance(a1, ObjectAMock)
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assert isinstance(a2, ObjectAMock)
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assert a1 is not a2
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assert a1.db is a2.db is Catalog.database()
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