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https://github.com/ets-labs/python-dependency-injector.git
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59 lines
1.5 KiB
Python
59 lines
1.5 KiB
Python
"""
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Concept example of objects catalogs.
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"""
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from objects import AbstractCatalog
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from objects.providers import Singleton
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from objects.providers import NewInstance
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from objects.providers import ExternalDependency
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from objects.injections import InitArg
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from objects.injections import Attribute
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import sqlite3
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# Some example classes.
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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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class ObjectB(object):
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def __init__(self, a, db):
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self.a = a
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self.db = db
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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 = ExternalDependency(instance_of=sqlite3.Connection)
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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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object_b = NewInstance(ObjectB,
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InitArg('a', object_a),
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InitArg('db', database))
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""" :type: (objects.Provider) -> ObjectB """
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# Satisfaction of external dependency.
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Catalog.database.satisfy(Singleton(sqlite3.Connection,
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InitArg('database', ':memory:'),
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Attribute('row_factory', sqlite3.Row)))
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# Catalog static provides.
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a1, a2 = Catalog.object_a(), Catalog.object_a()
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b1, b2 = Catalog.object_b(), Catalog.object_b()
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# Some asserts.
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assert a1 is not a2
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assert b1 is not b2
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assert a1.db is a2.db is b1.db is b2.db is Catalog.database()
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