How would I run a cron using auto-wired classes

Question

I'm currently building out an application that uses Slim v4 and PHP-DI for auto-wiring dependencies. This is fantastic besides the fact that I need to build a CRON that utilizes some classes that are auto-wired. Here's my example:

class NotificationService
{

    private $notification;

    public function __construct( NotificationFactory $notificationFactory )
    {
        $this->notification = $notificationFactory;
    }
}

In this case the Notification Service is auto-wired to use the Notification Factory, which is great. But I need to create a CRON that utilizes the NotificationService for sending notifications:

class TimedNotification
{

    private $notification;

    public function __construct( NotificationService $notificationService )
    {
         $this->notification = $notificationService;
    }


    public function sendNotification(): bool
    {
        $sent = $this->notification->sendMessage( 'This message is a test.' );
        return $sent;

    }

}

// Separate File
$timedNotification = new TimedNotification();
$timedNotification->sendMessage();

I'd like to be able to use a CRON to call the Timed notification file, or a separate file that has the TimedNotification instantiation like 0 23 * * * /my/dir/mycrons && php timednotifications.php

Is there a tried and true way of performing this, or would i have to build the entire app in a file to run the CRON ?

Answer 1

To autowire the dependencies, you have to use the DI container.

Example:

<?php

use DI\ContainerBuilder;

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

class NotificationService
{
    public function sendMessage(string $message): bool
    {
        echo $message . "\n";

        return true;
    }
}

class TimedNotification
{
    private $notification;

    public function __construct(NotificationService $notificationService)
    {
        $this->notification = $notificationService;
    }

    public function sendNotification(): bool
    {
        $sent = $this->notification->sendMessage('This message is a test.');

        return $sent;
    }

}

$containerBuilder = new ContainerBuilder();

// Add container definitions
//$containerBuilder->addDefinitions(...);

// Build PHP-DI Container instance
$container = $containerBuilder->build();

// Separate File
$timedNotification = $container->get(TimedNotification::class);
$timedNotification->sendNotification();

Output:

This message is a test.

In a real world application a Symfony Console would be the "standard" way to go.

File: bin\console.php

<?php

use Psr\Container\ContainerInterface;
use Symfony\Component\Console\Application;
use Symfony\Component\Console\Input\ArgvInput;

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

$env = (new ArgvInput())->getParameterOption(['--env', '-e'], 'development');

if ($env) {
    $_ENV['APP_ENV'] = $env;
}

/** @var ContainerInterface $container */
$container = (require __DIR__ . '/../config/bootstrap.php')->getContainer();

$application = $container->get(Application::class);

// Add custom commands
// See: https://symfony.com/doc/current/console.html#creating-a-command

$application->add($container->get(MyCustomCommand::class));
$application->add($container->get(MySecondCommand::class));
// ...

$application->run();