Where is the implementation of '$app->run()' in Lumen?

Question

I can't find where the implementation of run() method that is used on Lumen is defined. The one that can be seen in the bootstrapping file :

$app->run();

Where is this method defined?

Answer 1

It is defined on Laravel\\Lumen\\Concerns\\RoutesRequests .

If you take a look at bootstrap/app.php you'll see this:

$app = new Laravel\Lumen\Application(
    dirname(__DIR__)
);

So we know that $app is an instance of Laravel\\Lumen\\Application .

The method run() is not defined on this class, but if you look closely, you'll see this:

class Application extends Container
{
    use Concerns\RoutesRequests,
        Concerns\RegistersExceptionHandlers;

Those traits define additional behaviour for the class . Specifically, on Laravel\\Lumen\\Concerns\\RoutesRequests you'll find:

/**
 * Run the application and send the response.
 *
 * @param  SymfonyRequest|null  $request
 * @return void
 */
public function run($request = null)
{
    $response = $this->dispatch($request);

    if ($response instanceof SymfonyResponse) {
        $response->send();
    } else {
        echo (string) $response;
    }

    if (count($this->middleware) > 0) {
        $this->callTerminableMiddleware($response);
    }
}