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<?php |
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/** |
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* Shaper |
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* User: moyo |
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* Date: 19/08/2017 |
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* Time: 11:02 AM |
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*/ |
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namespace Carno\Shaping; |
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use function Carno\Coroutine\race; |
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use function Carno\Coroutine\timeout; |
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use Carno\Promise\Promise; |
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use Carno\Promise\Promised; |
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use Carno\Shaping\Exception\AcquirePermitsDeniedException; |
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use Carno\Shaping\Exception\AcquireWaitTimeoutException; |
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use SplStack; |
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class Shaper |
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{ |
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/** |
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* @var Options |
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*/ |
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private $options = null; |
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/** |
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* @var Bucket |
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*/ |
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private $bucket = null; |
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/** |
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* @var SplStack |
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*/ |
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private $waits = null; |
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/** |
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* Shaper constructor. |
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* @param Options $options |
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*/ |
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public function __construct(Options $options) |
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{ |
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$this->options = $options; |
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$this->waits = new SplStack; |
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$this->bucket = new Bucket($options, function (Bucket $bucket) { |
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$this->continues($bucket); |
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}); |
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Control::register($this); |
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} |
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/** |
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*/ |
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public function shutdown() : void |
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{ |
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$this->bucket->stop(); |
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Control::deregister($this); |
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} |
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/** |
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* @return int |
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*/ |
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public function tokens() : int |
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{ |
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return $this->bucket->tokens(); |
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} |
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/** |
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* @return int |
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*/ |
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public function waits() : int |
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{ |
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return $this->waits->count(); |
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} |
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/** |
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* @param Bucket $bucket |
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*/ |
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private function continues(Bucket $bucket) : void |
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{ |
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if ($this->waits->isEmpty()) { |
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return; |
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} |
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while (!$this->waits->isEmpty()) { |
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/** |
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* @var Promised $wait |
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*/ |
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list($permits, $wait) = $this->waits->shift(); |
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if ($wait->pended()) { |
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if ($bucket->out($permits)) { |
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$wait->resolve(); |
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} else { |
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$this->waits->unshift([$permits, $wait]); |
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break; |
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} |
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} |
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} |
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} |
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/** |
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* @param int $permits |
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* @return bool |
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*/ |
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public function acquired(int $permits = 1) : bool |
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{ |
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return $this->bucket->out($permits) ? true : false; |
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} |
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/** |
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* @param int $permits |
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* @return Promised |
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*/ |
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public function queued(int $permits = 1) : Promised |
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{ |
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if ($this->options->waitQMax && $this->waits->count() < $this->options->waitQMax) { |
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$queued = Promise::deferred(); |
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$this->waits->push([$permits, $queued]); |
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return race($queued, timeout($this->options->waitTimeout, AcquireWaitTimeoutException::class)); |
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} else { |
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return Promise::rejected(new AcquirePermitsDeniedException); |
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} |
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} |
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} |
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carno-php /
shaping
