Facade

The responsibility of the Facade is to provide a simplified interface to hide the domain implementation.

In Gacela, the Facade is the entry point of your module. It will simply give you the methods with the possible actions this module can do.

Entering your module

The Facade uses the Factory to create the module's domain instances and executes the desired behaviour from them.

Full code snippet: gacela-example/comment-spam-score/facade

php

<?php # src/Comment/CommentFacade.php

namespace App\Comment;

use Gacela\Framework\AbstractFacade;

/**
 * @method CommentFactory getFactory()
 */
final class CommentFacade extends AbstractFacade
{
    public function getSpamScore(string $comment): int
    {
        return $this->getFactory()
            ->createSpamChecker()
            ->getSpamScore($comment);
    }
}

The entry point of the module

The Facade uses the Factory to create the module's internal instances and executes the desired behaviour from them.

Full code snippet: gacela-example/comment-spam-score/entry-point

php

<?php
require __DIR__ . '/vendor/autoload.php';

use App\Comment\CommentFacade;
use Gacela\Framework\Gacela;

Gacela::bootstrap(__DIR__);

$facade = new CommentFacade();
$score = $facade->getSpamScore('Lorem ipsum!');

echo sprintf('Spam Score: %d', $score) . PHP_EOL;

Use the Facade from your infrastructure layer

You can easily access the Facade of your module from your infrastructure layer, like a Controller or a Command without the need of inheritance. You just need to use the trait: DocBlockResolverAwareTrait and define the getFacade() method in the DocBlock pointing to the concrete Facade.

A usage example:

php

<?php
/**
 * @method RunFacade getFacade()
 */
final class TestCommand extends Command
{
    use DocBlockResolverAwareTrait;

    protected function execute(InputInterface $in, OutputInterface $out): int
    {
        // Eg: `getDependencies()` is a method from `RunFacade` 
        $dependencies = $this->getFacade()->getDependencies($paths);
        // ...
    }
}

Why not simply instantiate the Facade?

Instantiating the Facade would be another alternative, but using DocBlockResolverAwareTrait Gacela will use the Locator singleton to avoid duplicating the creation of the same Facade multiple times.

How do this works?

Basically, the DocBlockResolverAwareTrait resolves on runtime the type from that method, so this trait is not limited to the Facade, but to any infrastructure class that you might want to load on the fly without the need of injecting via the constructor. Apart from this, Gacela will do the rest of the autoloading of its possible dependencies.

Facade ​

Entering your module ​

The entry point of the module ​

Use the Facade from your infrastructure layer ​