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#include "histogram_collector.h"
#include "atomics_array.h"
#include <util/generic/algorithm.h>
#include <util/generic/vector.h>
#include <util/generic/yexception.h>
#include <util/generic/ylimits.h>
#include <cmath>
namespace NMonitoring {
///////////////////////////////////////////////////////////////////////////
// TLinearHistogramCollector
///////////////////////////////////////////////////////////////////////////
class TLinearHistogramCollector: public IHistogramCollector {
public:
TLinearHistogramCollector(
ui32 bucketsCount, TBucketBound startValue, TBucketBound bucketWidth)
: Values_(bucketsCount)
, StartValue_(startValue)
, BucketWidth_(bucketWidth)
, MaxValue_(startValue + bucketWidth * (bucketsCount - 2))
{
}
void Collect(double value, ui64 count) noexcept override {
ui32 index = Max<ui32>();
if (value <= StartValue_) {
index = 0;
} else if (value > MaxValue_) {
index = Values_.Size() - 1;
} else {
double buckets = (value - StartValue_) / BucketWidth_;
index = static_cast<ui32>(std::ceil(buckets));
}
Values_.Add(index, count);
}
void Reset() noexcept override {
Values_.Reset();
}
IHistogramSnapshotPtr Snapshot() const override {
return new TLinearHistogramSnapshot(
StartValue_, BucketWidth_, Values_.Copy());
}
private:
TAtomicsArray Values_;
TBucketBound StartValue_;
double BucketWidth_;
TBucketBound MaxValue_;
};
IHistogramCollectorPtr LinearHistogram(
ui32 bucketsCount, TBucketBound startValue, TBucketBound bucketWidth)
{
Y_ENSURE(bucketsCount >= 2,
"linear histogram must contain at least two buckets");
Y_ENSURE(bucketsCount <= HISTOGRAM_MAX_BUCKETS_COUNT,
"buckets count must be <=" << HISTOGRAM_MAX_BUCKETS_COUNT
<< ", but got: " << bucketsCount);
Y_ENSURE(bucketWidth >= 1, "bucketWidth must be >= 1, got: " << bucketWidth);
return MakeHolder<TLinearHistogramCollector>(bucketsCount, startValue, bucketWidth);
}
}
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