<?php

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namespace GuzzleHttp\Promise;

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interface TaskQueueInterface

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{

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/**

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* Returns true if the queue is empty.

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*

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* @return bool

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*/

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public function isEmpty();

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/**

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* Adds a task to the queue that will be executed the next time run is

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* called.

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*/

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public function add(callable $task);

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/**

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* Execute all of the pending task in the queue.

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*/

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public function run();

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}

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