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https://github.com/ets-labs/python-dependency-injector.git
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47 lines
1.1 KiB
Python
47 lines
1.1 KiB
Python
"""Scoped provider examples."""
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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 Scoped
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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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class ObjectA(object):
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"""Example class ObjectA, that has dependency on database."""
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def __init__(self, db):
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"""Initializer."""
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self.db = db
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class Catalog(AbstractCatalog):
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"""Catalog of objects providers."""
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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 = Scoped(ObjectA,
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InitArg('db', database))
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""":type: (objects.Provider) -> ObjectA"""
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# Making one more scope using provider methods.
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Catalog.object_a.in_scope('request')
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object_a1 = Catalog.object_a()
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object_a2 = Catalog.object_a()
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Catalog.object_a.out_of_scope('request')
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assert object_a1 is object_a2
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assert object_a1.db is object_a2.db
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