vendor/illuminate/database/DatabaseServiceProvider.php

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<?php

namespace Illuminate\Database;

use Faker\Factory as FakerFactory;
use Faker\Generator as FakerGenerator;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\ServiceProvider;
use Illuminate\Contracts\Queue\EntityResolver;
use Illuminate\Database\Connectors\ConnectionFactory;
use Illuminate\Database\Eloquent\QueueEntityResolver;
use Illuminate\Database\Eloquent\Factory as EloquentFactory;

class DatabaseServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap the application events.
     *
     * @return void
     */
    public function boot()
    {
        Model::setConnectionResolver($this->app['db']);

        Model::setEventDispatcher($this->app['events']);
    }

    /**
     * Register the service provider.
     *
     * @return void
     */
    public function register()
    {
        Model::clearBootedModels();

        $this->registerConnectionServices();

        $this->registerEloquentFactory();

        $this->registerQueueableEntityResolver();
    }

    /**
     * Register the primary database bindings.
     *
     * @return void
     */
    protected function registerConnectionServices()
    {
        // The connection factory is used to create the actual connection instances on
        // the database. We will inject the factory into the manager so that it may
        // make the connections while they are actually needed and not of before.
        $this->app->singleton('db.factory', function ($app) {
            return new ConnectionFactory($app);
        });

        // The database manager is used to resolve various connections, since multiple
        // connections might be managed. It also implements the connection resolver
        // interface which may be used by other components requiring connections.