<?php
  
  namespace Illuminate\Contracts\Queue;
  
  interface QueueableCollection
  {
      /**
       * Get the type of the entities being queued.
       *
       * @return string|null
       */
      public function getQueueableClass();
  
      /**
       * Get the identifiers for all of the entities.
       *
       * @return array
       */
      public function getQueueableIds();
  
      /**
       * Get the relationships of the entities being queued.
       *
       * @return array
       */
      public function getQueueableRelations();
  
      /**
       * Get the connection of the entities being queued.
       *
       * @return string|null
       */
      public function getQueueableConnection();
  }