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   1  <?php
   2  
   3  namespace GuzzleHttp\Promise;
   4  
   5  interface TaskQueueInterface
   6  {
   7      /**
   8       * Returns true if the queue is empty.
   9       *
  10       * @return bool
  11       */
  12      public function isEmpty();
  13  
  14      /**
  15       * Adds a task to the queue that will be executed the next time run is
  16       * called.
  17       */
  18      public function add(callable $task);
  19  
  20      /**
  21       * Execute all of the pending task in the queue.
  22       */
  23      public function run();
  24  }