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180 lines
7.5 KiB
ReStructuredText
180 lines
7.5 KiB
ReStructuredText
Dependency Injector
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===================
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*Dependency Injector* is a Python dependency injection framework. It was
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designed to be unified, developer's friendly tool for managing any kind
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of Python objects and their dependencies in formal, pretty way.
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Below is a list of some key features and points of *Dependency Injector*:
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- Easy, smart, pythonic style.
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- Obvious, clear structure.
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- Memory efficiency.
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- Thread safety.
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- Semantic versioning.
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Main idea of *Dependency Injector* is to keep dependencies under control.
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Status
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------
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+---------------------------------------+---------------------------------------------------------------------------------+
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| *PyPi* | .. image:: https://img.shields.io/pypi/v/dependency_injector.svg |
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| | :target: https://pypi.python.org/pypi/dependency_injector/ |
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| | :alt: Latest Version |
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| | .. image:: https://img.shields.io/pypi/dm/dependency_injector.svg |
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| | :target: https://pypi.python.org/pypi/dependency_injector/ |
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| | :alt: Downloads |
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| | .. image:: https://img.shields.io/pypi/l/dependency_injector.svg |
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| | :target: https://pypi.python.org/pypi/dependency_injector/ |
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| | :alt: License |
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+---------------------------------------+---------------------------------------------------------------------------------+
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| *Python versions and implementations* | .. image:: https://img.shields.io/pypi/pyversions/dependency_injector.svg |
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| | :target: https://pypi.python.org/pypi/dependency_injector/ |
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| | :alt: Supported Python versions |
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| | .. image:: https://img.shields.io/pypi/implementation/dependency_injector.svg |
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| | :target: https://pypi.python.org/pypi/dependency_injector/ |
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| | :alt: Supported Python implementations |
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+---------------------------------------+---------------------------------------------------------------------------------+
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| *Builds and tests coverage* | .. image:: https://travis-ci.org/ets-labs/dependency_injector.svg?branch=master |
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| | :target: https://travis-ci.org/ets-labs/dependency_injector |
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| | :alt: Build Status |
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| | .. image:: https://coveralls.io/repos/ets-labs/dependency_injector/badge.svg |
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| | :target: https://coveralls.io/r/ets-labs/dependency_injector |
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| | :alt: Coverage Status |
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+---------------------------------------+---------------------------------------------------------------------------------+
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Installation
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------------
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*Dependency Injector* library is available on PyPi_::
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pip install dependency_injector
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Documentation
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-------------
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*Dependency Injector* documentation is hosted on ReadTheDocs:
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- `User's guide`_
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- `API docs`_
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Examples
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--------
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.. code-block:: python
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"""Concept example of `Dependency Injector`."""
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import sqlite3
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from dependency_injector import catalogs
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from dependency_injector import providers
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from dependency_injector import injections
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class UsersService(object):
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"""Users service, 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 AuthService(object):
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"""Auth service, that has dependencies on users service and database."""
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def __init__(self, db, users_service):
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"""Initializer."""
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self.db = db
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self.users_service = users_service
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class Services(catalogs.DeclarativeCatalog):
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"""Catalog of service providers."""
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database = providers.Singleton(sqlite3.connect, ':memory:')
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""":type: providers.Provider -> sqlite3.Connection"""
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users = providers.Factory(UsersService,
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db=database)
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""":type: providers.Provider -> UsersService"""
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auth = providers.Factory(AuthService,
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db=database,
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users_service=users)
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""":type: providers.Provider -> AuthService"""
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# Retrieving catalog providers:
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users_service = Services.users()
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auth_service = Services.auth()
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# Making some asserts:
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assert users_service.db is auth_service.db is Services.database()
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assert isinstance(auth_service.users_service, UsersService)
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assert users_service is not Services.users()
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assert auth_service is not Services.auth()
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# Making some "inline" injections:
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@injections.inject(users_service=Services.users)
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@injections.inject(auth_service=Services.auth)
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@injections.inject(database=Services.database)
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def example(users_service, auth_service, database):
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"""Example callback."""
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assert users_service.db is auth_service.db
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assert auth_service.db is database
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assert database is Services.database()
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# Making a call of decorated callback:
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example()
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# Overriding auth service provider and making some asserts:
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class ExtendedAuthService(AuthService):
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"""Extended version of auth service."""
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def __init__(self, db, users_service, ttl):
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"""Initializer."""
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self.ttl = ttl
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super(ExtendedAuthService, self).__init__(db=db,
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users_service=users_service)
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Services.auth.override(providers.Factory(ExtendedAuthService,
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db=Services.database,
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users_service=Services.users,
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ttl=3600))
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auth_service = Services.auth()
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assert isinstance(auth_service, ExtendedAuthService)
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You can get more *Dependency Injector* examples in ``/examples`` directory on
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GitHub:
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https://github.com/ets-labs/dependency_injector
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Feedback
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--------
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Feel free to post questions, bugs, feature requests, proposals etc. on
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*Dependency Injector* GitHub Issues:
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https://github.com/ets-labs/dependency_injector/issues
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Your feedback is quite important!
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.. _PyPi: https://pypi.python.org/pypi/dependency_injector
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.. _User's guide: http://dependency_injector.readthedocs.org/en/stable/
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.. _API docs: http://dependency-injector.readthedocs.org/en/stable/api/
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.. _SLOC: http://en.wikipedia.org/wiki/Source_lines_of_code
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.. _SOLID: http://en.wikipedia.org/wiki/SOLID_%28object-oriented_design%29
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.. _IoC: http://en.wikipedia.org/wiki/Inversion_of_control
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.. _dependency injection: http://en.wikipedia.org/wiki/Dependency_injection
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