Update default Bus binding in Lumen 5.2

With Laravel’s Lumen 5.2, gone are the handy functions dispatchFrom() and dispatchFromArray() available in the default Bus.

After a bit of searching I found AltThree’s Bus package, which basically the old Dispatcher, just being maintained outside of the Laravel core components.

However, it’s not as straight forward as creating a BusServiceProvider and rebinding the Bus Contract to the new Service Provider. If you take a look at the source, the Bus bindings are registered in the base Lumen Application.

Following advice from Graham Campbell, I was able to extend the base Lumen Application and override the registerBusBindings() method, so that any time the Bus’ Dispatcher Interface is requested, we return the AltThree implementation instead:

app/Application.php

<?php

namespace App;

use AltThree\Bus\Dispatcher;
use Illuminate\Contracts\Bus\Dispatcher as DispatcherContract;
use Illuminate\Contracts\Bus\QueueingDispatcher as QueueingDispatcherContract;
use Illuminate\Contracts\Queue\Factory;
use Laravel\Lumen\Application as LumenApplication;

class Application extends LumenApplication
{
    /**
     * Register container bindings for the application.
     *
     * @return void
     */
    protected function registerBusBindings()
    {
        $this->app->singleton(Dispatcher::class, function (Application $app) {
            return new Dispatcher($app, function ($connection = null) use ($app) {
                return $app->make(Factory::class)->connection($connection);
            });
        });

        $this->app->alias(Dispatcher::class, DispatcherContract::class);
        $this->app->alias(Dispatcher::class, QueueingDispatcherContract::class);
    }
}

You can of course just inject AltThree\Bus\Dispatcher however if, like me, you prefer the idea of injecting interfaces, this method just works.

If you discover a better method, please let me know and I’ll update.