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<?php
namespace GuzzleHttp\Promise;
interface TaskQueueInterface
{
/**
* Returns true if the queue is empty.
*
* @return bool
*/
public function isEmpty();
/**
* Adds a task to the queue that will be executed the next time run is
* called.
*
* @param callable $task
*/
public function add(callable $task);
/**
* Execute all of the pending task in the queue.
*/
public function run();
}