<?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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