<?php
 
 namespace Illuminate\Contracts\Queue;
 
 interface Monitor
 {
     /**
      * Register a callback to be executed on every iteration through the queue loop.
      *
      * @param  mixed  $callback
      * @return void
      */
     public function looping($callback);
 
     /**
      * Register a callback to be executed when a job fails after the maximum amount of retries.
      *
      * @param  mixed  $callback
      * @return void
      */
     public function failing($callback);
 
     /**
      * Register a callback to be executed when a daemon queue is stopping.
      *
      * @param  mixed  $callback
      * @return void
      */
     public function stopping($callback);
 }