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Editing: TaskRunner.php

<?php

namespace Amp\Parallel\Worker;

use Amp\Coroutine;
use Amp\Parallel\Sync\Channel;
use Amp\Parallel\Sync\SerializationException;
use Amp\Promise;
use function Amp\call;

final class TaskRunner
{
    /** @var Channel */
    private $channel;

/** @var Environment */
    private $environment;

public function __construct(Channel $channel, Environment $environment)
    {
        $this->channel = $channel;
        $this->environment = $environment;
    }

/**
     * Runs the task runner, receiving tasks from the parent and sending the result of those tasks.
     */
    public function run(): Promise
    {
        return new Coroutine($this->execute());
    }

/**
     * @coroutine
     */
    private function execute(): \Generator
    {
        $job = yield $this->channel->receive();

while ($job instanceof Internal\Job) {
            try {
                $result = yield call([$job->getTask(), "run"], $this->environment);
                $result = new Internal\TaskSuccess($job->getId(), $result);
            } catch (\Throwable $exception) {
                $result = new Internal\TaskFailure($job->getId(), $exception);
            }

$job = null; // Free memory from last job.

try {
                yield $this->channel->send($result);
            } catch (SerializationException $exception) {
                // Could not serialize task result.
                yield $this->channel->send(new Internal\TaskFailure($result->getId(), $exception));
            }

$result = null; // Free memory from last result.

$job = yield $this->channel->receive();
        }

return $job;
    }
}

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