mirror of
https://github.com/ets-labs/python-dependency-injector.git
synced 2024-11-25 11:04:01 +03:00
62 lines
1.4 KiB
Python
62 lines
1.4 KiB
Python
"""
|
|
Concept example of objects catalogs.
|
|
"""
|
|
|
|
from objects import Catalog, Singleton, NewInstance, InitArg, Attribute
|
|
import sqlite3
|
|
|
|
|
|
# Some example classes.
|
|
class A(object):
|
|
def __init__(self, db):
|
|
self.db = db
|
|
|
|
|
|
class B(object):
|
|
def __init__(self, a, db):
|
|
self.a = a
|
|
self.db = db
|
|
|
|
|
|
# Catalog of objects providers.
|
|
class AppCatalog(Catalog):
|
|
"""
|
|
Objects catalog.
|
|
"""
|
|
|
|
database = Singleton(sqlite3.Connection,
|
|
InitArg('database', ':memory:'),
|
|
Attribute('row_factory', sqlite3.Row))
|
|
""" :type: (objects.Provider) -> sqlite3.Connection """
|
|
|
|
object_a = NewInstance(A,
|
|
InitArg('db', database))
|
|
""" :type: (objects.Provider) -> A """
|
|
|
|
object_b = NewInstance(B,
|
|
InitArg('a', object_a),
|
|
InitArg('db', database))
|
|
""" :type: (objects.Provider) -> B """
|
|
|
|
|
|
# Catalog injection into consumer class.
|
|
class Consumer(object):
|
|
catalog = AppCatalog(AppCatalog.object_a,
|
|
AppCatalog.object_b)
|
|
|
|
def return_a_b(self):
|
|
return (self.catalog.object_a(),
|
|
self.catalog.object_b())
|
|
|
|
a1, b1 = Consumer().return_a_b()
|
|
|
|
|
|
# Catalog static provides.
|
|
a2 = AppCatalog.object_a()
|
|
b2 = AppCatalog.object_b()
|
|
|
|
# Some asserts.
|
|
assert a1 is not a2
|
|
assert b1 is not b2
|
|
assert a1.db is a2.db is b1.db is b2.db
|