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Mini Shell
<?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 = $environment;
}
/**
* Runs the task runner, receiving tasks from the parent and sending the result of those tasks.
*
* @return \Amp\Promise
*/
public function run(): Promise
{
return new Coroutine($this->execute());
}
/**
* @coroutine
*
* @return \Generator
*/
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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