A Gacela module example using anonymous classes

gacela-in-a-file.php

<?php

declare(strict_types=1);

# Using https://github.com/gacela-project/gacela

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

use Gacela\Framework\AbstractConfig;
use Gacela\Framework\AbstractFacade;
use Gacela\Framework\AbstractFactory;
use Gacela\Framework\AbstractProvider;
use Gacela\Framework\Bootstrap\GacelaConfig;
use Gacela\Framework\Container\Container;
use Gacela\Framework\Gacela;


Gacela::bootstrap(__DIR__,function (GacelaConfig $config){
    $config->addAppConfigKeyValue('default-name', 'Gacela'); // this can be read from a config file
});

/** This is an example class from your @infrastructure layer */
final class Printer
{
    public function print(string $str): void
    {
        echo $str;
    }
}

/**This is an example class from your @application layer */
final class Greeter
{
    public function __construct(
        private readonly Printer $printer,
        private readonly string $defaultName,
    ) {}

    public function greet(string $name): void
    {
        if ($name === '') {
            $name = $this->defaultName;
        }
        $this->printer->print("Hello, {$name}!\n");
    }
}

##########################################################
# The Gacela classes example of a module all-in-one file #
##########################################################
$facade = new class() extends AbstractFacade {
    public function greet(string $name): void
    {
        $this->getFactory()   // the Facade uses the Factory
            ->createGreeter() // to create
            ->greet($name);   // and use the object directly
    }
};

Gacela::addGlobal(
    new class() extends AbstractFactory {
        public function createGreeter(): object
        {
            return new Greeter(                    // the Factory creates the internal dependencies
                $this->getProvidedDependency('printer'), // has access to external dependencies
                $this->getConfig()->getDefaultName(),         // and has access to the config values
            );
        }
    },
);

Gacela::addGlobal(
    new class() extends AbstractProvider {
        public function provideModuleDependencies(Container $container): void
        {
            // the Provider defines the extra dependencies of the "module"
            $container->set('printer', static fn () => new Printer());
        }
    },
);

Gacela::addGlobal(
    new class() extends AbstractConfig {
        public function getDefaultName(): string
        {
            // the Config can access the config files
            return $this->get('default-name');
        }
    },
);

##############################
########### OUTPUT ###########
##############################

$facade->greet('World');
$facade->greet('');

/**
 * ➜ php local/gacela-in-a-file.php
 * Hello, World!
 * Hello, Gacela!
 */

# Explanation: Gacela::addGlobal() will create a class binding to a context, 
# if none is passed (2nd argument) then the current file will be used. 
# This means that the anonymous Facade will have the Factory, Provider and Config
# connected to it because they are all bind to the same file.