intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 67 insertions, 0 deletions

diff --git a/library/cpp/monlib/metrics/histogram_collector_linear.cpp b/library/cpp/monlib/metrics/histogram_collector_linear.cpp
new file mode 100644
index 0000000000..f8ad86f3a4
--- /dev/null
+++ b/library/cpp/monlib/metrics/histogram_collector_linear.cpp
@@ -0,0 +1,67 @@
+#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, ui32 count) 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() 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);
+    }
+}