Events in Yii2 when to use?

Hello,

in order to make my code reusable and decouple application into modules I decided to use events.

For example I have a controller:




class InvoiceController extends Controller {


 public function actionAddinvoice() {

    $InvoiceEvent = new InvoiceEvent();


    //here I generate new invoice number

    $InvoiceEvent->trigger(InvoiceEvent::EVENT_NEW_INVOICE_NUMBER);

    $invoiceNumber = $InvoiceEvent->getInvoiceNumber();




 }

}



and my InvoiceEvent class:





class InvoiceEvent extends Component {


   private $invoiceNumber;


   ///....///


   public function getInvoiceNumber(){


    ////.....////

   

   $this->$invoiceNumber = ....


   }


}




Suppose that the function getInvoiceNumber() has a lot to do (check db, prepare number etc.), so I remove it from controller to keep it thin. Should I use events this way? Is that correct and has sense?