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https://github.com/ets-labs/python-dependency-injector.git
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Removing old examples
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Roman Mogilatov
parent
2c2d4f7434
commit
878f1d49aa
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"""Provider delegation example."""
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from objects.catalog import AbstractCatalog
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from objects.providers import Factory
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from objects.providers import Singleton
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from objects.injections import KwArg
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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 ObjectB(object):
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"""Example class ObjectB, that has dependency on ObjectA provider."""
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def __init__(self, a_provider):
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"""Initializer."""
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self.a_provider = a_provider
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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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KwArg('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 = Factory(ObjectA,
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KwArg('db', database))
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""":type: (objects.Provider) -> ObjectA"""
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object_b = Singleton(ObjectB,
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KwArg('a_provider', object_a.delegate()))
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""":type: (objects.Provider) -> ObjectB"""
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# Catalog static provides.
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b = Catalog.object_b()
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a1, a2 = b.a_provider(), b.a_provider()
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# Some asserts.
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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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"""`Factory` and `Singleton` providers example."""
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from objects.providers import Factory
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from objects.providers import Singleton
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# Factory provider creates new instance of specified class on every call.
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object_factory = Factory(object)
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object_1 = object_factory()
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object_2 = object_factory()
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assert object_1 is not object_2
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assert isinstance(object_1, object) and isinstance(object_2, object)
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# Singleton provider creates new instance of specified class on first call
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# and returns same instance on every next call.
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single_object = Singleton(object)
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single_object_1 = single_object()
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single_object_2 = single_object()
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assert single_object_1 is single_object_2
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assert isinstance(object_1, object) and isinstance(object_2, object)
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@ -1,45 +0,0 @@
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"""`Factory` and `Singleton` providers with injections example."""
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import sqlite3
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from objects.providers import Singleton
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from objects.providers import Factory
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from objects.injections import KwArg
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from objects.injections import Attribute
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class ObjectA(object):
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"""ObjectA has dependency on database."""
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def __init__(self, database):
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"""Initializer.
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Database dependency need to be injected via init arg."""
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self.database = database
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def get_one(self):
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"""Select one from database and return it."""
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return self.database.execute('SELECT 1').fetchone()[0]
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# Database and `ObjectA` providers.
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database = Singleton(sqlite3.Connection,
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KwArg('database', ':memory:'),
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KwArg('timeout', 30),
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KwArg('detect_types', True),
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KwArg('isolation_level', 'EXCLUSIVE'),
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Attribute('row_factory', sqlite3.Row))
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object_a_factory = Factory(ObjectA,
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KwArg('database', database))
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# Creating several `ObjectA` instances.
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object_a_1 = object_a_factory()
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object_a_2 = object_a_factory()
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# Making some asserts.
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assert object_a_1 is not object_a_2
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assert object_a_1.database is object_a_2.database is database()
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assert object_a_1.get_one() == object_a_2.get_one() == 1
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"""Providers overriding example."""
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import sqlite3
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from objects.providers import Factory
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from objects.providers import Singleton
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from objects.injections import KwArg
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from objects.injections import Attribute
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class ObjectA(object):
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"""ObjectA has dependency on database."""
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def __init__(self, database):
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"""Initializer.
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Database dependency need to be injected via init arg."""
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self.database = database
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def get_one(self):
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"""Select one from database and return it."""
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return self.database.execute('SELECT 1')
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class ObjectAMock(ObjectA):
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"""Mock of ObjectA.
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Has no dependency on database.
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"""
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def __init__(self):
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"""Initializer."""
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def get_one(self):
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"""Select one from database and return it.
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Mock makes no database queries and always returns two instead of one.
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"""
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return 2
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# Database and `ObjectA` providers.
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database = Singleton(sqlite3.Connection,
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KwArg('database', ':memory:'),
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KwArg('timeout', 30),
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KwArg('detect_types', True),
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KwArg('isolation_level', 'EXCLUSIVE'),
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Attribute('row_factory', sqlite3.Row))
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object_a_factory = Factory(ObjectA,
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KwArg('database', database))
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# Overriding `ObjectA` provider with `ObjectAMock` provider.
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object_a_factory.override(Factory(ObjectAMock))
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# Creating several `ObjectA` instances.
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object_a_1 = object_a_factory()
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object_a_2 = object_a_factory()
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# Making some asserts.
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assert object_a_1 is not object_a_2
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assert object_a_1.get_one() == object_a_2.get_one() == 2
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@ -1,68 +0,0 @@
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"""Providers delegation example."""
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from objects.providers import Factory
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from objects.providers import Singleton
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from objects.providers import Delegate
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from objects.injections import KwArg
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class User(object):
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"""Example class User."""
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def __init__(self, id, name):
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"""Initializer.
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:param id: int
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:param name: str
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:return:
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"""
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self.id = id
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self.name = name
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class UserService(object):
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"""Example class UserService.
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UserService has dependency on users factory.
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"""
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def __init__(self, users_factory):
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"""Initializer.
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:param users_factory: objects.providers.Factory
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:return:
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"""
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self.users_factory = users_factory
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def get_by_id(self, id):
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"""Return user info by user id."""
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return self.users_factory(id=id, name=self._get_name_from_db(id))
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def _get_name_from_db(self, id):
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"""Return user's name from database by his id.
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Main purpose of this method is just to show the fact of retrieving
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some user's data from database, so, actually, it simulates work
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with database just by merging constant string with provided user's id.
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"""
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return ''.join(('user', str(id)))
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# Users factory and UserService provider:
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users_factory = Factory(User)
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users_service = Singleton(UserService,
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KwArg('users_factory', Delegate(users_factory)))
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# Creating several User objects:
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user1 = users_service().get_by_id(1)
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user2 = users_service().get_by_id(2)
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# Making some asserts:
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assert user1.id == 1
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assert user1.name == 'user1'
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assert user2.id == 2
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assert user2.name == 'user2'
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