Domin

domin ( domain model interface ) is an administration interface for abstract Domain Models using the Command Object pattern.

For an example of how to use use, check out the sample application.

Model

Every ability of a system is represented by an Action which specifies how to execute it and what Parameters it requires. Therefore domin can take care of getting missing parameters from the user using Fields. Actions may return values which are presented using Renderers.

Installation

To use domin in your project, require it with Composer

composer require rtens/domin

If you would like to develop on domin, download it with Composer and execute the specification with scrut

composer create-project -sdev rtens/domin
cd domin
vendor/bin/scrut spec

Quick Start

To run domin as a web application with curir as delivery system, paste the following code into index.php

use rtens\domin\delivery\web\adapters\curir\root\IndexResource;
use rtens\domin\delivery\web\WebApplication;
use watoki\curir\WebDelivery;

WebDelivery::quickResponse(IndexResource::class,
    WebDelivery::init(null,
        WebApplication::init(function (WebApplication $app) {
            // Set-up $app here (e.g. $app->actions->add('foo', ...))
        })));

To run domin with silex, past this code into index.php

use rtens\domin\delivery\web\adapters\silex\SilexControllerProvider;
use rtens\domin\delivery\web\WebApplication;
use Silex\Application;

require_once __DIR__ . '/vendor/autoload.php';

$app = new Application();
$app->mount('/', new SilexControllerProvider(
    WebApplication::init(function (WebApplication $app) {
        // Set-up $app here (e.g. $app->actions->add('foo', ...))
    })));
$app->run();

And then start a development server to access the application on localhost:8000

$ php -S localhost:8000 index.php

To get the CLI application running, paste this code into cli.php

use rtens\domin\delivery\cli\CliApplication;

CliApplication::run(CliApplication::init(function (CliApplication $app) {
    // Set-up $app here (e.g. $app->actions->add('foo', ...))
}));

and run it with

$ php cli.php

Action!

Actions decide what Parameters they need, how to fill() them with default values and, most importantly, how to execute() them. The way domin knows what actions there are is through the ActionRegistry, so all actions need to be added to it.

There are several ways to create actions:

Implementing Action

The most straight-forward although probably not most convenient way is to create an implementation of Action for every ability of the system.

class MyAction implements Action {

    public function caption() {
        return 'Some Action';
    }

    public function description() {
        return 'Some Description';
    }

    public function parameters() {
        return [
            new Parameter('foo', new StringType()),
            new Parameter('bar', new ClassType(\DateTime::class))
        ];
    }

    public function fill(array $parameters) {
        $parameters['foo'] = 'default value of foo';
        return $parameters;
    }

    public function execute(array $parameters) {
        return "Make it so! " . json_encode($parameters);
    }
}

$actionRegistry->add('my', new MyAction());

Extending ObjectAction

If you represent abilities with DTOs, you can extend you actions from the ObjectAction to infer Parameters from the properties of these classes using reflection. This sub-class can then be made generic for example by using a Command Bus.

class MyAction extends ObjectAction {
    
    public function __construct($class, TypeFactory $types, CommandBus $bus) {
        parent::__construct($class, $types);
        $this->bus = $bus;
    }

    protected function executeWith($object) {
        $this->bus->handle($object);
    }
}

$actionRegistry->add('my', new MyAction(MyCommand::class, $types, $bus));
$actionRegistry->add('your', new MyAction(YourCommand::class, $types, $bus));
$actionRegistry->add('their', new MyAction(TheirCommand::class, $types, $bus));

Generating ObjectActions

With a generic way to execute actions, you can use the ObjectActionGenerator to generate and register actions from all classes in a folder automatically.

(new ObjectActionGenerator($actionRegistry, $typeFactory))->fromFolder('model/commands', function ($object) {
    $bus->handle($object);
});

Using MethodAction

If you don't feel like creating a class for every command, you can use the MethodAction to infer parameters from a method signature.

$actionRegistry->add('my', new MethodAction($handler, 'handleMyCommand', $typeFactory));
$actionRegistry->add('your', new MethodAction($handler, 'handleYourCommand', $typeFactory));
$actionRegistry->add('their', new MethodAction($handler, 'handleTheirCommand', $typeFactory));

Generating MethodActions

There is also a MethodActionGenerator to register all methods of an object.

(new MethodActionGenerator($actionRegistry, $typeFactory))->fromObject($handler);

License

domin is released under the MIT License