111 lines
3.0 KiB
PHP
111 lines
3.0 KiB
PHP
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<?php
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declare(strict_types=1);
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namespace OpenTelemetry\SDK\Metrics\Stream;
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use function assert;
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use GMP;
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use OpenTelemetry\SDK\Metrics\AggregationInterface;
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/**
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* @internal
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*/
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final class DeltaStorage
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{
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private AggregationInterface $aggregation;
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private Delta $head;
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public function __construct(AggregationInterface $aggregation)
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{
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$this->aggregation = $aggregation;
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$this->head = new Delta(new Metric([], [], 0), 0);
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/** @phan-suppress-next-line PhanTypeObjectUnsetDeclaredProperty */
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unset($this->head->metric);
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}
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/**
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* @psalm-suppress UndefinedDocblockClass
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* @phan-suppress PhanUndeclaredTypeParameter
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* @param int|GMP $readers
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*/
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public function add(Metric $metric, $readers): void
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{
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/** @phpstan-ignore-next-line */
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if ($readers == 0) {
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return;
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}
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if (($this->head->prev->readers ?? null) != $readers) {
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$this->head->prev = new Delta($metric, $readers, $this->head->prev);
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} else {
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assert($this->head->prev !== null);
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$this->mergeInto($this->head->prev->metric, $metric);
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}
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}
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public function collect(int $reader, bool $retain = false): ?Metric
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{
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$n = null;
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for ($d = $this->head; $d->prev; $d = $d->prev) {
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if (($d->prev->readers >> $reader & 1) != 0) {
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if ($n !== null) {
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assert($n->prev !== null);
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$n->prev->readers ^= $d->prev->readers;
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$this->mergeInto($d->prev->metric, $n->prev->metric);
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$this->tryUnlink($n);
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if ($n->prev === $d->prev) {
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continue;
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}
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}
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$n = $d;
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}
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}
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$metric = $n->prev->metric ?? null;
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if (!$retain && $n) {
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assert($n->prev !== null);
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$n->prev->readers ^= ($n->prev->readers & 1 | 1) << $reader;
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$this->tryUnlink($n);
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}
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return $metric;
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}
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private function tryUnlink(Delta $n): void
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{
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assert($n->prev !== null);
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/** @phpstan-ignore-next-line */
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if ($n->prev->readers == 0) {
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$n->prev = $n->prev->prev;
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return;
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}
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for ($c = $n->prev->prev;
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$c && ($n->prev->readers & $c->readers) == 0;
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$c = $c->prev) {
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}
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if ($c && $n->prev->readers === $c->readers) {
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$this->mergeInto($c->metric, $n->prev->metric);
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$n->prev = $n->prev->prev;
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}
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}
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private function mergeInto(Metric $into, Metric $metric): void
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{
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foreach ($metric->summaries as $k => $summary) {
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$into->attributes[$k] ??= $metric->attributes[$k];
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$into->summaries[$k] = isset($into->summaries[$k])
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? $this->aggregation->merge($into->summaries[$k], $summary)
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: $summary;
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}
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$into->exemplars += $metric->exemplars;
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}
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}
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