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<?php |
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/** |
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* Metrics type "summary" |
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* User: moyo |
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* Date: 2018/5/17 |
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* Time: 11:06 PM |
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* @see http://infolab.stanford.edu/~datar/courses/cs361a/papers/quantiles.pdf |
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*/ |
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namespace Carno\Monitor\Metrics; |
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use Carno\Monitor\Chips\Metrical\Labeled; |
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use Carno\Monitor\Chips\Metrical\Named; |
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use Carno\Monitor\Chips\Metrical\Reporting; |
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use Carno\Monitor\Chips\Metrical\SExporter; |
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use Carno\Monitor\Chips\Metrical\SQuantiles; |
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use Carno\Monitor\Contracts\HMRegistry; |
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use Carno\Monitor\Contracts\RAWMetrics; |
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use Carno\Monitor\Contracts\Telemetry; |
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class Summary implements RAWMetrics, HMRegistry, Telemetry |
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{ |
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use Named, Labeled, SQuantiles, SExporter, Reporting; |
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/** |
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* @var float |
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*/ |
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private $epsilon = 0; |
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/** |
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* @var int |
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*/ |
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private $threshold = 0; |
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/** |
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* @var int |
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*/ |
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private $count = 0; |
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/** |
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* @var float |
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*/ |
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private $sum = 0; |
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/** |
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* @var SItem[] |
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*/ |
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private $samples = []; |
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/** |
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* Summary constructor. |
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* @param float $epsilon |
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* @param int $threshold |
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*/ |
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public function __construct(float $epsilon = 0.001, int $threshold = 2000) |
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{ |
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$this->epsilon = $epsilon; |
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$this->threshold = $threshold; |
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} |
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/** |
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* @param float $v |
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*/ |
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public function observe(float $v) : void |
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{ |
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$rank = $this->ranked($v); |
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$delta = $rank === 0 || $rank === count($this->samples) ? 0 : floor(2 * $this->epsilon * $this->count); |
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array_splice($this->samples, $rank, 0, [new SItem($v, 1, $delta)]); |
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count($this->samples) > $this->threshold && $this->compress(); |
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$this->count ++; |
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$this->sum += $v; |
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} |
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/** |
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* @param float $quantile |
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* @return float |
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*/ |
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private function query(float $quantile) : float |
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{ |
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$rank = 0; |
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$desired = intval($quantile * $this->count); |
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for ($i = 1; $i < count($this->samples); $i ++) { |
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$sp = $this->samples[$i - 1]; |
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$sc = $this->samples[$i]; |
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if (($rank += $sp->g) + $sc->g + $sc->d > $desired + (2 * $this->epsilon * $this->count)) { |
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return $sp->v; |
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} |
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} |
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return end($this->samples)->v; |
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} |
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/** |
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*/ |
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private function compress() : void |
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{ |
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for ($i = 0; $i < count($this->samples) - 1; $i ++) { |
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$sa = $this->samples[$i]; |
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$sb = $this->samples[$i + 1]; |
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if ($sa->g + $sb->g + $sb->d <= floor(2 * $this->epsilon * $this->count)) { |
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$sb->g += $sa->g; |
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array_splice($this->samples, $i, 1); |
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} |
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} |
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} |
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/** |
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* @param float $v |
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* @return int |
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*/ |
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private function ranked(float $v) : int |
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{ |
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if (empty($this->samples)) { |
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return 0; |
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} |
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$start = $rank = 0; |
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$end = count($this->samples) - 1; |
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while ($start <= $end) { |
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$rank = intval(($start + $end) / 2); |
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if (($curr = $this->samples[$rank]->v) < $v) { |
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$start = $rank + 1; |
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} elseif ($curr > $v) { |
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$end = $rank - 1; |
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} else { |
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return $rank; |
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} |
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} |
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return $rank; |
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} |
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} |
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