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<?php |
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/** |
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* Nodes routing |
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* User: moyo |
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* Date: 27/10/2017 |
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* Time: 4:04 PM |
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*/ |
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namespace Carno\Cluster\Managed; |
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use Carno\Cluster\Contracts\Tags; |
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use Carno\Cluster\Routing; |
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use function Carno\Coroutine\all; |
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use Carno\Net\Address; |
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use Carno\Net\Endpoint; |
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use Carno\Promise\Promise; |
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use Carno\Promise\Promised; |
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trait Router |
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{ |
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/** |
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* @var array |
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*/ |
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protected $tags = Tags::DEFAULT; |
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/** |
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* @var bool |
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*/ |
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protected $strict = true; |
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/** |
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* @var Routing |
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*/ |
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private $routing = null; |
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/** |
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* @var mixed[] |
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*/ |
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private $connected = []; |
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/** |
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* @return Routing |
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*/ |
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public function routing() : Routing |
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{ |
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return |
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$this->routing ?? |
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$this->routing = (new Routing( |
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sprintf('%s:%s', $this->type, $this->server), |
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function (int $evk, Endpoint $endpoint) { |
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$this->changed($evk, $endpoint); |
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} |
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))->strictly($this->strict)->accepts(...$this->tags) |
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; |
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} |
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/** |
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* @param int $evk |
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* @param Endpoint $endpoint |
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*/ |
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protected function changed(int $evk, Endpoint $endpoint) : void |
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{ |
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switch ($evk) { |
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case Routing::JOINING: |
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$this->joined(true); |
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$this->discovered($endpoint); |
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break; |
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case Routing::LEAVING: |
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$this->disconnected($endpoint); |
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break; |
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} |
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} |
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/** |
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* @param Endpoint $node |
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*/ |
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protected function discovered(Endpoint $node) : void |
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{ |
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// do nothing |
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} |
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/** |
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* @return bool |
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*/ |
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protected function clustered() : bool |
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{ |
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return $this->routing()->clustered(); |
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} |
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/** |
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* @param Endpoint $node |
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* @return mixed |
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*/ |
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protected function picked(Endpoint $node) |
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{ |
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return $this->connected($node); |
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} |
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/** |
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* @param string ...$tags |
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* @return mixed |
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*/ |
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protected function picking(string ...$tags) |
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{ |
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return $this->connected($this->routing()->picking(...$tags)); |
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} |
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/** |
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* @return Promised |
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*/ |
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protected function releasing() : Promised |
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{ |
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$pending = []; |
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foreach ($this->connected as $nodeID => $sar) { |
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$pending[] = $this->disconnected((new Endpoint(new Address(0)))->assignID($nodeID)); |
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} |
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return all(...$pending); |
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} |
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/** |
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* @param Endpoint $node |
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* @return mixed |
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*/ |
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private function connected(Endpoint $node) |
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{ |
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return $this->connected[$node->id()] ?? $this->connected[$node->id()] = $this->connecting($node); |
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} |
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/** |
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* @param Endpoint $node |
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* @return Promised |
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*/ |
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private function disconnected(Endpoint $node) : Promised |
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{ |
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if ($cn = $this->connected[$node->id()] ?? null) { |
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unset($this->connected[$node->id()]); |
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return $this->disconnecting($cn); |
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} else { |
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return Promise::rejected(); |
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} |
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} |
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} |
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