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Factory+Registry pattern for Python classes

Project description

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ClassRegistry

At the intersection of the Registry and Factory patterns lies the ClassRegistry:

  • Define global factories that generate new class instances based on configurable keys.

  • Seamlessly create powerful service registries.

  • Integrate with setuptools’s entry_points system to make your registries infinitely extensible by 3rd-party libraries!

  • And more!

Getting Started

Create a registry using the class_registry.ClassRegistry class, then decorate any classes that you wish to register with its register method:

from class_registry import ClassRegistry

pokedex = ClassRegistry()

@pokedex.register('fire')
class Charizard(Pokemon):
  ...

@pokedex.register('grass')
class Bulbasaur(Pokemon):
  ...

@pokedex.register('water')
class Squirtle(Pokemon):
  ...

To create a class instance from a registry, use the subscript operator:

# Charizard, I choose you!
fighter1 = pokedex['fire']

# CHARIZARD fainted!
# How come my rival always picks the type that my pokémon is weak against??
fighter2 = pokedex['grass']

Advanced Usage

There’s a whole lot more you can do with ClassRegistry, including:

  • Provide args and kwargs to new class instances.

  • Automatically register non-abstract classes.

  • Integrate with setuptools’s entry_points system so that 3rd-party libraries can add their own classes to your registries.

  • Wrap your registry in an instance cache to create a service registry.

  • And more!

For more advanced usage, check out the documentation on ReadTheDocs!

Requirements

ClassRegistry is known to be compatible with the following Python versions:

  • 3.11

  • 3.10

  • 3.9

Installation

Install the latest stable version via pip:

pip install phx-class-registry

Running Unit Tests

Install the package with the test-runner extra to set up the necessary dependencies, and then you can run the tests with the tox command:

pip install -e .[test-runner]
tox -p all

Documentation

Documentation is available on ReadTheDocs.

If you are installing from source (see above), you can also build the documentation locally:

  1. Install extra dependencies (you only have to do this once):

    pip install -e '.[docs-builder]'
  2. Switch to the docs directory:

    cd docs
  3. Build the documentation:

    make html

Releases

Steps to build releases are based on Packaging Python Projects Tutorial

  1. Install extra dependencies (you only have to do this once):

    pip install -e '.[build-system]'
  2. Run the build:

    python -m build

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