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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/**
* \class CountMetric
* \ingroup metrics
*
* \brief Metric representing a count.
*
* A counter metric have the following properties:
* - It can never decrease, only increase.
* - Logs its value as a count event.
* - When summing counts, the counts are added together.
*/
#pragma once
#include <vespa/metrics/metricvalueset.h>
#include <atomic>
namespace metrics {
template <typename T>
struct CountMetricValues : public MetricValueClass {
T _value;
struct AtomicImpl {
AtomicImpl() noexcept : _value(0) {}
AtomicImpl(const AtomicImpl & rhs) noexcept : _value(rhs._value.load(std::memory_order_relaxed)) {}
std::atomic<T> _value;
};
void relaxedStoreInto(AtomicImpl& target) const noexcept {
target._value.store(_value, std::memory_order_relaxed);
}
void relaxedLoadFrom(const AtomicImpl& source) noexcept {
_value = source._value.load(std::memory_order_relaxed);
}
CountMetricValues() : _value(0) {}
std::string toString() const;
double getDoubleValue(stringref) const override;
uint64_t getLongValue(stringref) const override;
void output(const std::string&, std::ostream& out) const override;
void output(const std::string&, vespalib::JsonStream& stream) const override;
bool inUse() const { return (_value != 0); }
};
} // metrics
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