mirror of
https://github.com/ets-labs/python-dependency-injector.git
synced 2024-11-22 17:47:02 +03:00
37 lines
1.3 KiB
ReStructuredText
37 lines
1.3 KiB
ReStructuredText
Writing of custom providers
|
|
---------------------------
|
|
|
|
.. currentmodule:: dependency_injector.providers
|
|
|
|
List of *Dependency Injector* providers could be widened with custom providers.
|
|
|
|
Below are some tips and recommendations that have to be met:
|
|
|
|
1. Every custom provider has to extend base provider class -
|
|
:py:class:`Provider`.
|
|
2. Cusom provider's ``__init__()`` could be overriden, but parent's
|
|
initializer (:py:meth:`Provider.__init__`) has to be called.
|
|
3. Providing strategy has to be implemented in custom provider's
|
|
:py:meth:`Provider.__call__` method.
|
|
4. If custom provider is based on some standard providers, it is better to
|
|
use delegation of standard providers, then extending of them.
|
|
5. If custom provider defines any attributes, it is good to list them in
|
|
``__slots__`` attribute (as *Dependency Injector* does). It can save
|
|
some memory.
|
|
6. If custom provider deals with injections, it is strongly recommended
|
|
to be consistent with :py:class:`Factory`, :py:class:`Singleton` and
|
|
:py:class:`Callable` providers style.
|
|
|
|
Example:
|
|
|
|
.. image:: /images/providers/custom_provider.png
|
|
:width: 100%
|
|
:align: center
|
|
|
|
.. literalinclude:: ../../examples/providers/custom_factory.py
|
|
:language: python
|
|
:linenos:
|
|
|
|
|
|
.. disqus::
|