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<?php |
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/** |
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* Channel piping |
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* User: moyo |
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* Date: 15/09/2017 |
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* Time: 2:24 PM |
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*/ |
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namespace Carno\Channel; |
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use Carno\Channel\Exception\ChannelClosingException; |
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use Carno\Coroutine\Context; |
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use Carno\Promise\Promise; |
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use Carno\Promise\Promised; |
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use SplQueue; |
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class Channel implements Chan |
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{ |
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/** |
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* @var int |
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*/ |
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private $cap = 1; |
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/** |
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* @var SplQueue |
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*/ |
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private $qData = null; |
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/** |
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* @var SplQueue |
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*/ |
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private $qSend = null; |
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/** |
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* @var SplQueue |
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*/ |
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private $qRecv = null; |
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/** |
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* @var bool |
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*/ |
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private $closing = false; |
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/** |
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* @var Promised |
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*/ |
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private $closed = null; |
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/** |
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* Channel constructor. |
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* @param int $cap |
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*/ |
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public function __construct(int $cap = 1) |
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{ |
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$this->cap = $cap; |
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$this->qData = new SplQueue(); |
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$this->qSend = new SplQueue(); |
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$this->qRecv = new SplQueue(); |
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} |
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/** |
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* @return int |
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*/ |
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public function cap() : int |
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{ |
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return $this->cap; |
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} |
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/** |
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* @param mixed $data |
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* @param Context $ctx |
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* @return Promised |
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*/ |
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public function send($data = null, Context $ctx = null) : Promised |
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{ |
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if ($this->closing) { |
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throw new ChannelClosingException(); |
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} |
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/** |
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* @var Promised $wait |
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*/ |
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if ($this->qData->count() < $this->cap) { |
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if ($this->qRecv->count() > 0) { |
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$wait = $this->qRecv->dequeue(); |
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$wait->resolve($data, $ctx); |
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} else { |
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$this->qData->enqueue([$data, $ctx]); |
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} |
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return Promise::resolved(); |
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} |
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$this->qData->enqueue([$data, $ctx]); |
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$this->qSend->enqueue($block = Promise::deferred()); |
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return $block; |
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} |
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/** |
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* @return Promised |
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*/ |
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public function recv() : Promised |
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{ |
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if ($this->closing) { |
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throw new ChannelClosingException(); |
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} |
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/** |
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* @var Promised $wait |
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*/ |
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if ($this->qData->count() > 0) { |
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if ($this->qSend->count() > 0) { |
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$wait = $this->qSend->dequeue(); |
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$wait->resolve(); |
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} |
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return Promise::resolved(...$this->qData->dequeue()); |
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} |
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$this->qRecv->enqueue($block = Promise::deferred()); |
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return $block; |
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} |
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/** |
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* @return void |
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*/ |
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public function close() : void |
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{ |
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if ($this->closing) { |
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return; |
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} |
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$this->closing = true; |
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/** |
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* @var Promised $send |
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* @var Promised $recv |
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*/ |
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while ($this->qSend->count() > 0) { |
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$send = $this->qSend->dequeue(); |
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$send->throw(new ChannelClosingException()); |
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} |
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while ($this->qRecv->count() > 0) { |
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$recv = $this->qRecv->dequeue(); |
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$recv->throw(new ChannelClosingException()); |
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} |
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$this->closed()->resolve(); |
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} |
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/** |
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* @return Promised |
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*/ |
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public function closed() : Promised |
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{ |
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return $this->closed ?? $this->closed = Promise::deferred(); |
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} |
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/** |
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* @return string |
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*/ |
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168
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public function __toString() : string |
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169
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{ |
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return sprintf('%d|%d|%d', $this->qData->count(), $this->qSend->count(), $this->qRecv->count()); |
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} |
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} |
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carno-php /
channel
