How to use a controller inside another controller in Laravel5 as service

I have an Invoice controller it looks something like this

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Http\Requests;
use App\Http\Controllers\Controller;
use Illuminate\Support\Facades\Input;
use App\Event;
use App\Employee;
use App\Invoice;
use Mail;
use View;

class ViewinvoiceController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function getIndex($order_id)
    {
       $id=$order_id;

        $invoicedata=Invoice::where('Id',$id)->get();


    $html22 =  View('viewinvoice')->with(array('invoicedata'=>$invoicedata ))->render();

     require_once(app_path().'/libs/html2pdf/html2pdf.class.php');


      $html2pdf = new \HTML2PDF('P','A4','en',true,'UTF-8',array(0, 0, 0, 0));

      // $html2pdf->pdf->SetDisplayMode('fullpage');

      $html2pdf->WriteHTML($html22);

     $html2pdf->Output('Invoice.pdf');


    }

}

I want to use this controller in other controller which looks like this

class CollectionController extends Controller
    {

        public function __construct(){

    $this->middleware('role:collector'); // replace 'collector' with whatever role you need.
      }
       public function getInvoice($order_id){
       //Here I have to write the logic of getting the invoice from the invoiceController 
}

}

I googled and found out one way is to write a service to get invoice ,

I can make it as a normal class as service but I don't know whats the right way in laravel 5

Any suggestion

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