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<?php
namespace Amp\Parallel\Worker;
use Amp\Promise;
/**
* An interface for a parallel worker thread that runs a queue of tasks.
*/
interface Worker
{
/**
* Checks if the worker is running.
*
* @return bool True if the worker is running, otherwise false.
*/
public function isRunning(): bool;
/**
* Checks if the worker is currently idle.
*
* @return bool
*/
public function isIdle(): bool;
/**
* Enqueues a {@see Task} to be executed by the worker.
*
* @param Task $task The task to enqueue.
*
* @return Promise<mixed> Resolves with the return value of {@see Task::run()}.
*
* @throws TaskFailureThrowable Promise fails if {@see Task::run()} throws an exception.
*/
public function enqueue(Task $task): Promise;
/**
* @return Promise<int> Resolves with the worker exit code.
*/
public function shutdown(): Promise;
/**
* Immediately kills the context.
*/
public function kill();
}