intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 72 insertions, 0 deletions

diff --git a/library/cpp/monlib/metrics/summary_snapshot.h b/library/cpp/monlib/metrics/summary_snapshot.h
new file mode 100644
index 0000000000..afcc895fd3
--- /dev/null
+++ b/library/cpp/monlib/metrics/summary_snapshot.h
@@ -0,0 +1,72 @@
+#pragma once
+
+#include <util/generic/ptr.h>
+
+namespace NMonitoring {
+
+    class ISummaryDoubleSnapshot: public TAtomicRefCount<ISummaryDoubleSnapshot> {
+    public:
+        virtual ~ISummaryDoubleSnapshot() = default;
+
+        // TODO: write documentation
+
+        virtual ui64 GetCount() const = 0;
+
+        virtual double GetSum() const = 0;
+
+        virtual double GetMin() const = 0;
+
+        virtual double GetMax() const = 0;
+
+        virtual double GetLast() const = 0;
+
+        virtual ui64 MemorySizeBytes() const = 0;
+    };
+
+    using ISummaryDoubleSnapshotPtr = TIntrusivePtr<ISummaryDoubleSnapshot>;
+
+    class TSummaryDoubleSnapshot final: public ISummaryDoubleSnapshot {
+    public:
+        TSummaryDoubleSnapshot(double sum, double min, double max, double last, ui64 count)
+            : Sum_(sum)
+            , Min_(min)
+            , Max_(max)
+            , Last_(last)
+            , Count_(count)
+        {}
+
+        ui64 GetCount() const noexcept override {
+            return Count_;
+        }
+
+        double GetSum() const noexcept override {
+            return Sum_;
+        }
+
+        double GetMin() const noexcept override {
+            return Min_;
+        }
+
+        double GetMax() const noexcept override {
+            return Max_;
+        }
+
+        virtual double GetLast() const noexcept override {
+            return Last_;
+        }
+
+        ui64 MemorySizeBytes() const noexcept override {
+            return sizeof(*this);
+        }
+
+    private:
+        double Sum_;
+        double Min_;
+        double Max_;
+        double Last_;
+        ui64 Count_;
+    };
+
+}
+
+std::ostream& operator<<(std::ostream& os, const NMonitoring::ISummaryDoubleSnapshot& s);