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<?php
declare(strict_types=1);
namespace OpenTelemetry\SDK\Metrics\Aggregation;
use function array_fill;
use function count;
use const INF;
use const NAN;
use OpenTelemetry\Context\ContextInterface;
use OpenTelemetry\SDK\Common\Attribute\AttributesInterface;
use OpenTelemetry\SDK\Metrics\AggregationInterface;
use OpenTelemetry\SDK\Metrics\Data;
/**
* @implements AggregationInterface<ExplicitBucketHistogramSummary>
*/
final class ExplicitBucketHistogramAggregation implements AggregationInterface
{
/**
* @var list<float|int>
* @readonly
*/
public array $boundaries;
/**
* @param list<float|int> $boundaries strictly ascending histogram bucket boundaries
*/
public function __construct(array $boundaries)
{
$this->boundaries = $boundaries;
}
public function initialize(): ExplicitBucketHistogramSummary
{
return new ExplicitBucketHistogramSummary(
0,
0,
+INF,
-INF,
array_fill(0, count($this->boundaries) + 1, 0),
);
}
/**
* @param ExplicitBucketHistogramSummary $summary
*/
public function record($summary, $value, AttributesInterface $attributes, ContextInterface $context, int $timestamp): void
{
$boundariesCount = count($this->boundaries);
for ($i = 0; $i < $boundariesCount && $this->boundaries[$i] < $value; $i++) {
}
$summary->count++;
$summary->sum += $value;
$summary->min = self::min($value, $summary->min);
$summary->max = self::max($value, $summary->max);
$summary->buckets[$i]++;
}
/**
* @param ExplicitBucketHistogramSummary $left
* @param ExplicitBucketHistogramSummary $right
*/
public function merge($left, $right): ExplicitBucketHistogramSummary
{
$count = $left->count + $right->count;
$sum = $left->sum + $right->sum;
$min = self::min($left->min, $right->min);
$max = self::max($left->max, $right->max);
$buckets = $right->buckets;
foreach ($left->buckets as $i => $bucketCount) {
$buckets[$i] += $bucketCount;
}
return new ExplicitBucketHistogramSummary(
$count,
$sum,
$min,
$max,
$buckets,
);
}
/**
* @param ExplicitBucketHistogramSummary $left
* @param ExplicitBucketHistogramSummary $right
*/
public function diff($left, $right): ExplicitBucketHistogramSummary
{
$count = -$left->count + $right->count;
$sum = -$left->sum + $right->sum;
$min = $left->min > $right->min ? $right->min : NAN;
$max = $left->max < $right->max ? $right->max : NAN;
$buckets = $right->buckets;
foreach ($left->buckets as $i => $bucketCount) {
$buckets[$i] -= $bucketCount;
}
return new ExplicitBucketHistogramSummary(
$count,
$sum,
$min,
$max,
$buckets,
);
}
/**
* @param array<ExplicitBucketHistogramSummary> $summaries
*/
public function toData(
array $attributes,
array $summaries,
array $exemplars,
int $startTimestamp,
int $timestamp,
$temporality
): Data\Histogram {
$dataPoints = [];
foreach ($attributes as $key => $dataPointAttributes) {
if ($summaries[$key]->count === 0) {
continue;
}
$dataPoints[] = new Data\HistogramDataPoint(
$summaries[$key]->count,
$summaries[$key]->sum,
$summaries[$key]->min,
$summaries[$key]->max,
$summaries[$key]->buckets,
$this->boundaries,
$dataPointAttributes,
$startTimestamp,
$timestamp,
$exemplars[$key] ?? [],
);
}
return new Data\Histogram(
$dataPoints,
$temporality,
);
}
/**
* @param float|int $left
* @param float|int $right
* @return float|int
*/
private static function min($left, $right)
{
/** @noinspection PhpConditionAlreadyCheckedInspection */
return $left <= $right ? $left : ($right <= $left ? $right : NAN);
}
/**
* @param float|int $left
* @param float|int $right
* @return float|int
*/
private static function max($left, $right)
{
/** @noinspection PhpConditionAlreadyCheckedInspection */
return $left >= $right ? $left : ($right >= $left ? $right : NAN);
}
}
|
