153 lines
6.3 KiB
ReStructuredText
153 lines
6.3 KiB
ReStructuredText
Dependency Injector
|
|
===================
|
|
|
|
Dependency injection framework for Python projects.
|
|
|
|
+---------------------------------------+-------------------------------------------------------------------------------+
|
|
| *PyPi* | .. image:: https://img.shields.io/pypi/v/dependency_injector.svg |
|
|
| | :target: https://pypi.python.org/pypi/dependency_injector/ |
|
|
| | :alt: Latest Version |
|
|
| | .. image:: https://img.shields.io/pypi/dm/dependency_injector.svg |
|
|
| | :target: https://pypi.python.org/pypi/dependency_injector/ |
|
|
| | :alt: Downloads |
|
|
| | .. image:: https://img.shields.io/pypi/l/dependency_injector.svg |
|
|
| | :target: https://pypi.python.org/pypi/dependency_injector/ |
|
|
| | :alt: License |
|
|
+---------------------------------------+-------------------------------------------------------------------------------+
|
|
| *Python versions and implementations* | .. image:: https://img.shields.io/pypi/pyversions/dependency_injector.svg |
|
|
| | :target: https://pypi.python.org/pypi/dependency_injector/ |
|
|
| | :alt: Supported Python versions |
|
|
| | .. image:: https://img.shields.io/pypi/implementation/dependency_injector.svg |
|
|
| | :target: https://pypi.python.org/pypi/dependency_injector/ |
|
|
| | :alt: Supported Python implementations |
|
|
+---------------------------------------+-------------------------------------------------------------------------------+
|
|
| *Builds and tests coverage* | .. image:: https://travis-ci.org/rmk135/dependency_injector.svg?branch=master |
|
|
| | :target: https://travis-ci.org/rmk135/dependency_injector |
|
|
| | :alt: Build Status |
|
|
| | .. image:: https://coveralls.io/repos/rmk135/dependency_injector/badge.svg |
|
|
| | :target: https://coveralls.io/r/rmk135/dependency_injector |
|
|
| | :alt: Coverage Status |
|
|
+---------------------------------------+-------------------------------------------------------------------------------+
|
|
|
|
*Dependency Injector* is a dependency injection framework for Python projects.
|
|
It was designed to be unified, developer's friendly tool for managing any kind
|
|
of Python objects and their dependencies in formal, pretty way.
|
|
|
|
Below is a list of some key features and points of *Dependency Injector*
|
|
framework:
|
|
|
|
- Easy, smart, pythonic style.
|
|
- Obvious, clear structure.
|
|
- Memory efficiency.
|
|
- Semantic versioning.
|
|
|
|
Main idea of *Dependency Injector* is to keep dependencies under control.
|
|
|
|
Installation
|
|
------------
|
|
|
|
*Dependency Injector* library is available on PyPi_::
|
|
|
|
pip install dependency_injector
|
|
|
|
Documentation
|
|
-------------
|
|
|
|
*Dependency Injector* documentation is hosted on ReadTheDocs:
|
|
|
|
- `Stable version`_
|
|
- `Latest version`_
|
|
|
|
Examples
|
|
--------
|
|
|
|
.. code-block:: python
|
|
|
|
"""Concept example of `Dependency Injector`."""
|
|
|
|
import sqlite3
|
|
import dependency_injector as di
|
|
|
|
|
|
class ObjectA(object):
|
|
|
|
"""Example class ObjectA, that has dependency on database."""
|
|
|
|
def __init__(self, db):
|
|
"""Initializer."""
|
|
self.db = db
|
|
|
|
|
|
class ObjectB(object):
|
|
|
|
"""Example class ObjectB, that has dependencies on ObjectA and database."""
|
|
|
|
def __init__(self, a, db):
|
|
"""Initializer."""
|
|
self.a = a
|
|
self.db = db
|
|
|
|
|
|
class Catalog(di.AbstractCatalog):
|
|
|
|
"""Catalog of providers."""
|
|
|
|
database = di.Singleton(sqlite3.Connection,
|
|
database=':memory:')
|
|
""":type: (di.Provider) -> sqlite3.Connection"""
|
|
|
|
object_a_factory = di.Factory(ObjectA,
|
|
db=database)
|
|
""":type: (di.Provider) -> ObjectA"""
|
|
|
|
object_b_factory = di.Factory(ObjectB,
|
|
a=object_a_factory,
|
|
db=database)
|
|
""":type: (di.Provider) -> ObjectB"""
|
|
|
|
|
|
# Catalog static provides.
|
|
a1, a2 = Catalog.object_a_factory(), Catalog.object_a_factory()
|
|
b1, b2 = Catalog.object_b_factory(), Catalog.object_b_factory()
|
|
|
|
assert a1 is not a2
|
|
assert b1 is not b2
|
|
assert a1.db is a2.db is b1.db is b2.db is Catalog.database()
|
|
|
|
|
|
# Example of inline injections.
|
|
@di.inject(a=Catalog.object_a_factory)
|
|
@di.inject(b=Catalog.object_b_factory)
|
|
@di.inject(database=Catalog.database)
|
|
def example(a, b, database):
|
|
"""Example callback."""
|
|
assert a.db is b.db is database is Catalog.database()
|
|
|
|
|
|
example()
|
|
|
|
You can get more *Dependency Injector* examples in ``/examples`` directory on
|
|
GitHub:
|
|
|
|
https://github.com/rmk135/dependency_injector
|
|
|
|
|
|
Feedback
|
|
--------
|
|
|
|
Feel free to post questions, bugs, feature requests, proposals etc. on
|
|
*Dependency Injector* GitHub Issues:
|
|
|
|
https://github.com/rmk135/dependency_injector/issues
|
|
|
|
Your feedback is quite important!
|
|
|
|
|
|
.. _PyPi: https://pypi.python.org/pypi/dependency_injector
|
|
.. _Stable version: http://dependency_injector.readthedocs.org/en/stable/
|
|
.. _Latest version: http://dependency_injector.readthedocs.org/en/latest/
|
|
.. _SLOC: http://en.wikipedia.org/wiki/Source_lines_of_code
|
|
.. _SOLID: http://en.wikipedia.org/wiki/SOLID_%28object-oriented_design%29
|
|
.. _IoC: http://en.wikipedia.org/wiki/Inversion_of_control
|
|
.. _dependency injection: http://en.wikipedia.org/wiki/Dependency_injection
|