我应该在Laravel中为服务创建单独的提供程序吗？

Question

I have custom service in Laravel:

<?php
namespace App\Library\Services;

class RegisterCustomerService
{
    public function do()
    {
        return 'Output from DemoOne';
    }

}

In which cases I should create provider for this service, when not?

Could I use RegisterCustomerService as composition in specific class like:

$c = new RegisterCustomerService();

Or am i obligated to create Provider?

Answer 1

Service providers are only necessary if the service needs custom configuration. You can typehint any class in the constructor and Laravel will try to resolve it to an instance.

An example service provider that configures a service with a config value is shown below:

class MyServiceProvider extends ServiceProvider
{
   public function register()
    {
        $this->app->singleton(MyCustomService::class, function ($app) {
            return new MyCustomService(config('api_token'));
        });
    }
}

usage:

class ProjectController {
  // Receives the service configured by the service provider above.
  public function __construct(MyCustomService $service){
    $this->service = $service;
  }
}

More details about service providers: https://laravel.com/docs/5.8/providers