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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/**
* @class metrics::ValueMetric
* @ingroup metrics
*
* @brief Creates a metric measuring any value.
*
* A value metric have the following properties:
* - Logs the average as a value event. (It is not strictly increasing)
* - When summing average metrics together, the sum becomes the average of
* all values added to both.
*/
#pragma once
#include "metricvalueset.h"
#include <limits>
namespace metrics {
template<typename AvgVal, typename TotVal>
struct ValueMetricValues : MetricValueClass {
uint32_t _count;
AvgVal _min, _max, _last;
TotVal _total;
struct AtomicImpl {
AtomicImpl() noexcept
: _count(0),
_min(std::numeric_limits<AvgVal>::max()),
_max(std::numeric_limits<AvgVal>::min()),
_last(0),
_total(0)
{}
AtomicImpl(const AtomicImpl & rhs) noexcept
: _count(rhs._count.load(std::memory_order_relaxed)),
_min(rhs._min.load(std::memory_order_relaxed)),
_max(rhs._max.load(std::memory_order_relaxed)),
_last(rhs._last.load(std::memory_order_relaxed)),
_total(rhs._total.load(std::memory_order_relaxed))
{}
std::atomic<uint32_t> _count;
std::atomic<AvgVal> _min;
std::atomic<AvgVal> _max;
std::atomic<AvgVal> _last;
std::atomic<TotVal> _total;
};
ValueMetricValues();
void relaxedStoreInto(AtomicImpl& target) const noexcept;
void relaxedLoadFrom(const AtomicImpl& source) noexcept;
template<typename T>
T getValue(stringref id) const;
double getDoubleValue(stringref id) const override;
uint64_t getLongValue(stringref id) const override;
void output(const std::string& id, std::ostream& out) const override;
void output(const std::string& id, vespalib::JsonStream& stream) const override;
template<typename A, typename T>
friend std::ostream & operator << (std::ostream & os, const ValueMetricValues<A, T> & v);
};
} // metrics
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