mirror of
https://github.com/ets-labs/python-dependency-injector.git
synced 2024-11-30 05:23:59 +03:00
70 lines
1.7 KiB
Python
70 lines
1.7 KiB
Python
"""Providers delegation example."""
|
|
|
|
from objects.providers import Factory
|
|
from objects.providers import Singleton
|
|
from objects.providers import Delegate
|
|
|
|
from objects.injections import KwArg
|
|
|
|
|
|
class User(object):
|
|
|
|
"""Example class User."""
|
|
|
|
def __init__(self, id, name):
|
|
"""Initializer.
|
|
|
|
:param id: int
|
|
:param name: str
|
|
:return:
|
|
"""
|
|
self.id = id
|
|
self.name = name
|
|
|
|
|
|
class UserService(object):
|
|
|
|
"""Example class UserService.
|
|
|
|
UserService has dependency on users factory.
|
|
"""
|
|
|
|
def __init__(self, users_factory):
|
|
"""Initializer.
|
|
|
|
:param users_factory: (objects.providers.Factory) -> User
|
|
:return:
|
|
"""
|
|
self.users_factory = users_factory
|
|
|
|
def get_by_id(self, id):
|
|
"""Return user info by user id."""
|
|
return self.users_factory(id=id, name=self._get_name_from_db(id))
|
|
|
|
def _get_name_from_db(self, id):
|
|
"""Return user's name from database by his id.
|
|
|
|
Main purpose of this method is just to show the fact of retrieving
|
|
some user's data from database, so, actually, it simulates work
|
|
with database just by merging constant string with provided user's id.
|
|
"""
|
|
return ''.join(('user', str(id)))
|
|
|
|
|
|
# Users factory and UserService provider:
|
|
users_factory = Factory(User)
|
|
users_service = Singleton(UserService,
|
|
KwArg('users_factory', Delegate(users_factory)))
|
|
|
|
|
|
# Creating several User objects:
|
|
user1 = users_service().get_by_id(1)
|
|
user2 = users_service().get_by_id(2)
|
|
|
|
# Making some asserts:
|
|
assert user1.id == 1
|
|
assert user1.name == 'user1'
|
|
|
|
assert user2.id == 2
|
|
assert user2.name == 'user2'
|