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<?php |
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/** |
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* File ProcessQueue.php |
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* |
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* @author Edward Pfremmer <[email protected]> |
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*/ |
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namespace Epfremme\ProcessQueue\Process; |
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use Epfremme\Collection\Collection; |
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use Epfremme\ProcessQueue\System\ProcessorCounter; |
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use GuzzleHttp\Promise\PromiseInterface; |
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use Symfony\Component\Process\Process; |
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/** |
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* Class ProcessQueue |
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* |
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* @package Epfremme\ProcessQueue\Process |
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*/ |
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class ProcessQueue implements \Countable |
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{ |
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const SLEEP_MICRO_SECONDS = 1000; |
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const PROMISE_KEY = 'promise'; |
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/** |
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* @var int |
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*/ |
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private $limit; |
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/** |
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* @var Collection |
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*/ |
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private $queue; |
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/** |
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* ProcessQueue constructor |
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* |
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* @param int $limit |
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*/ |
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public function __construct($limit = null) |
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{ |
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if (!is_null($limit) && !is_int($limit)) { |
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throw new \InvalidArgumentException(sprintf('Limit must be of type int %s given', gettype($limit))); |
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} |
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$this->limit = $limit ?: (new ProcessorCounter())->getCpuCount(); |
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$this->queue = new Collection(); |
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} |
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/** |
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* Add new process to the queue |
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* |
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* @param Process $process |
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* @return $this |
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*/ |
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public function add(Process $process) |
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{ |
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$this->queue->add($process); |
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return $this; |
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} |
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/** |
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* Return pending processes |
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* |
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* @return Collection |
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*/ |
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public function getPending() |
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{ |
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return $this->queue->filter(function(Process $process) { |
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return !$process->isStarted(); |
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}); |
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} |
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/** |
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* Return running processes |
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* |
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* @return Collection |
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*/ |
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public function getRunning() |
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{ |
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return $this->queue->filter(function(Process $process) { |
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return $process->isRunning(); |
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}); |
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} |
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/** |
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* Return completed processes |
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* |
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* @return Collection |
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*/ |
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public function getCompleted() |
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{ |
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return $this->queue->filter(function(Process $process) { |
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return $process->isTerminated(); |
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}); |
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} |
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/** |
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* Clear and resolve completed processes from the queue |
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* |
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* @return void |
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*/ |
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private function clearCompleted() |
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{ |
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$this->getCompleted()->each(function(Process $process) { |
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$process->wait(); |
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$this->resolve($process); |
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}); |
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} |
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/** |
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* Halt execution and wait for target process to finish |
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* |
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* @param Process $process |
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*/ |
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public function resolve(Process $process) |
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{ |
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$options = $process->getOptions(); |
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$promise = array_key_exists(self::PROMISE_KEY, $options) ? $options[self::PROMISE_KEY] : null; |
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if ($promise instanceof PromiseInterface) { |
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$promise->wait(false); |
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} |
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$this->queue->remove($process); |
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} |
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/** |
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* Run the queue |
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* |
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* @return \Generator |
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*/ |
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public function __invoke() |
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{ |
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while (!$this->queue->isEmpty()) { |
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usleep(self::SLEEP_MICRO_SECONDS); |
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$pending = $this->getPending(); |
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if ($pending->count() && $this->getRunning()->count() < $this->limit) { |
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yield $pending->shift(); |
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} else { |
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yield new NullProcess(); |
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} |
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$this->clearCompleted(); |
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} |
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} |
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/** |
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* Return queue count |
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* |
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* @return int |
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*/ |
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public function count() |
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{ |
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return $this->queue->count(); |
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} |
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} |
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epfremmer /
process-queue
