Pierstoval / CharacterManagerBundle

        if ($action instanceof \Closure) {

            // Lazy loading

            $action = $this->actions[$manager][$stepName]();

            if (!$action instanceof StepActionInterface) {

                throw new \RuntimeException(\sprintf(

                    "Lazy-loaded action \"%s\" for character manager \"%s\" must be resolved to an instance of \"%s\".\n\"%s\" given.",

                    $stepName,

                    $manager,

                    StepActionInterface::class,

                    \is_object($action) ? \get_class($action) : \gettype($action)

                ));

            }

            $this->actions[$manager][$stepName] = $action;

        }

    private function setSteps(array $steps): void

    {

        foreach ($steps as $step) {

            if (!$step instanceof StepInterface) {

                throw new \InvalidArgumentException(\sprintf(

                    'Expected %s instance, "%s" given.',

                    StepActionInterface::class,

                    \is_object($step) ? \get_class($step) : \gettype($step)

                ));

            }

        }

        $this->steps = $steps;