mirror of
https://github.com/ets-labs/python-dependency-injector.git
synced 2024-11-22 09:36:48 +03:00
135 lines
4.7 KiB
ReStructuredText
135 lines
4.7 KiB
ReStructuredText
.. _decoupled-packages:
|
|
|
|
Decoupled packages example (multiple containers)
|
|
================================================
|
|
|
|
.. meta::
|
|
:keywords: Python,Dependency Injection,Inversion of Control,Container,Example,Application,
|
|
Framework,AWS,boto3,client
|
|
:description: This example shows how to use Dependency Injector to create Python decoupled packages.
|
|
To achieve a decoupling each package has a container with the components. When
|
|
a component needs a dependency from the outside of the package scope we use the
|
|
Dependency provider. The package container has no knowledge on where the
|
|
dependencies come from. It states a need that the dependencies must be provided.
|
|
This helps to decouple a package from the 3rd party dependencies and other
|
|
packages.
|
|
|
|
This example shows how to use ``Dependency Injector`` to create decoupled packages.
|
|
|
|
To achieve a decoupling each package has a container with the components. When a component needs a
|
|
dependency from the outside of the package scope we use the ``Dependency`` provider. The package
|
|
container has no knowledge on where the dependencies come from. It states a need that the
|
|
dependencies must be provided. This helps to decouple a package from the 3rd party dependencies
|
|
and other packages.
|
|
|
|
To wire the packages we use an application container. Application container has all 3rd party
|
|
dependencies and package containers. It wires the packages and dependencies to create a
|
|
complete application.
|
|
|
|
We build an example micro application that consists of 3 packages:
|
|
|
|
- ``user`` - a package with user domain logic, depends on a database
|
|
- ``photo`` - a package with photo domain logic, depends on a database and AWS S3
|
|
- ``analytics`` - a package with analytics domain logic, depends on the ``user`` and ``photo``
|
|
package components
|
|
|
|
.. image:: images/decoupled-packages.png
|
|
:width: 100%
|
|
:align: center
|
|
|
|
Start from the scratch or jump to the section:
|
|
|
|
.. contents::
|
|
:local:
|
|
:backlinks: none
|
|
|
|
You can find the source code and instructions for running on the `Github <https://github.com/ets-labs/python-dependency-injector/tree/master/examples/miniapps/decoupled-packages>`_.
|
|
|
|
Application structure
|
|
---------------------
|
|
|
|
Application consists of an ``example`` package, a configuration file and a ``requirements.txt``
|
|
file.
|
|
|
|
.. code-block:: bash
|
|
|
|
./
|
|
├── example/
|
|
│ ├── analytics/
|
|
│ │ ├── __init__.py
|
|
│ │ ├── containers.py
|
|
│ │ └── services.py
|
|
│ ├── photo/
|
|
│ │ ├── __init__.py
|
|
│ │ ├── containers.py
|
|
│ │ ├── entities.py
|
|
│ │ └── repositories.py
|
|
│ ├── user/
|
|
│ │ ├── __init__.py
|
|
│ │ ├── containers.py
|
|
│ │ ├── entities.py
|
|
│ │ └── repositories.py
|
|
│ ├── __init__.py
|
|
│ ├── __main__.py
|
|
│ └── containers.py
|
|
├── config.ini
|
|
└── requirements.txt
|
|
|
|
Package containers
|
|
------------------
|
|
|
|
Listing of the ``example/user/containers.py``:
|
|
|
|
.. literalinclude:: ../../examples/miniapps/decoupled-packages/example/user/containers.py
|
|
:language: python
|
|
|
|
Listing of the ``example/photo/containers.py``:
|
|
|
|
.. literalinclude:: ../../examples/miniapps/decoupled-packages/example/photo/containers.py
|
|
:language: python
|
|
|
|
Listing of the ``example/analytics/containers.py``:
|
|
|
|
.. literalinclude:: ../../examples/miniapps/decoupled-packages/example/analytics/containers.py
|
|
:language: python
|
|
|
|
Application container
|
|
---------------------
|
|
|
|
Application container consists of all packages and 3rd party dependencies. Its role is to wire
|
|
everything together in a complete application.
|
|
|
|
Listing of the ``example/containers.py``:
|
|
|
|
.. literalinclude:: ../../examples/miniapps/decoupled-packages/example/containers.py
|
|
:language: python
|
|
|
|
.. note::
|
|
Package ``analytics`` has dependencies on the repositories from the ``user`` and
|
|
``photo`` packages. This is an example of how you can pass the dependencies from one package
|
|
to another.
|
|
|
|
Main module
|
|
-----------
|
|
Listing of the ``example/__main__.py``:
|
|
|
|
.. literalinclude:: ../../examples/miniapps/decoupled-packages/example/__main__.py
|
|
:language: python
|
|
|
|
Configuration
|
|
-------------
|
|
|
|
Listing of the ``config.ini``:
|
|
|
|
.. literalinclude:: ../../examples/miniapps/decoupled-packages/config.ini
|
|
:language: ini
|
|
|
|
Run the application
|
|
-------------------
|
|
|
|
You can find the source code and instructions for running on the `Github <https://github.com/ets-labs/python-dependency-injector/tree/master/examples/miniapps/decoupled-packages>`_.
|
|
|
|
.. include:: ../sponsor.rst
|
|
|
|
.. disqus::
|