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<?php |
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/** |
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* Route selector |
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* User: moyo |
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* Date: 27/10/2017 |
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* Time: 4:23 PM |
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*/ |
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namespace Carno\Cluster\Routing; |
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use Carno\Cluster\Contracts\Tags; |
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use Carno\Cluster\Exception\UnavailableServiceNodesException; |
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use Carno\Cluster\Routing\Types\Forced; |
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use Carno\Net\Endpoint; |
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class Selector |
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{ |
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/** |
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* @var string |
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*/ |
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private $serviced = null; |
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/** |
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* @var Endpoint[] |
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*/ |
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private $nodes = []; |
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/** |
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* @var Endpoint[][] |
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*/ |
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private $tagged = []; |
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/** |
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* @var Typeset |
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*/ |
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private $typeset = null; |
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/** |
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* Selector constructor. |
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* @param string $serviced |
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*/ |
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public function __construct(string $serviced) |
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{ |
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$this->serviced = $serviced; |
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$this->typeset = new Typeset(new Forced); |
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} |
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/** |
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* @return Typeset |
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*/ |
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public function typeset() : Typeset |
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{ |
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return $this->typeset; |
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} |
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/** |
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* @return bool |
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*/ |
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public function available() : bool |
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{ |
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return count($this->nodes) > 0; |
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} |
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/** |
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* @return bool |
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*/ |
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public function clustered() : bool |
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{ |
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return count($this->nodes) > 1; |
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} |
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/** |
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* @param string ...$tags |
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* @return Endpoint |
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*/ |
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public function picking(string ...$tags) : Endpoint |
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{ |
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// type forced |
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if ($nodes = $this->typeset->picked()) { |
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goto RND_PICK; |
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} |
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// tagged searching |
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foreach ($tags as $tag) { |
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if ($nodes = $this->tagged[$tag] ?? []) { |
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goto RND_PICK; |
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} |
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} |
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// fallback to master |
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if ($nodes = $this->tagged[Tags::MASTER] ?? []) { |
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goto RND_PICK; |
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} |
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// no services |
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throw new UnavailableServiceNodesException($this->serviced); |
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// random picking |
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RND_PICK: return $nodes[array_rand($nodes)]; |
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} |
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/** |
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* @param Endpoint $node |
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*/ |
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public function classify(Endpoint $node) : void |
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{ |
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foreach ($node->getTags() ?: Tags::DEFAULT as $tag) { |
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if (substr($tag, 0, $cl = strlen(Tags::CMD)) === Tags::CMD) { |
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$this->typeset->classify(substr($tag, $cl), $node); |
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} else { |
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$this->tagged[$tag][$node->id()] = $node; |
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} |
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} |
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$this->nodes[$node->id()] = $node; |
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} |
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/** |
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* @param Endpoint $node |
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*/ |
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public function release(Endpoint $node) : void |
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{ |
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$this->typeset->release($node); |
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foreach ($this->tagged as $tag => $nodes) { |
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if (isset($nodes[$node->id()])) { |
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unset($this->tagged[$tag][$node->id()]); |
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} |
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} |
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unset($this->nodes[$node->id()]); |
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} |
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} |
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carno-php /
cluster
