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<?php
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declare(strict_types=1);
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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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    public function isEmpty(): bool;
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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): void;
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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(): void;
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}