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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <memory>
#include "metric_id.h"
#include "point.h"
namespace vespalib {
namespace metrics {
class MetricsManager;
struct GaugeAggregator;
/**
* Represents a gauge metric that can be measured.
**/
class Gauge {
private:
std::shared_ptr<MetricsManager> _manager;
MetricId _id;
public:
Gauge(std::shared_ptr<MetricsManager> m, MetricId id)
: _manager(std::move(m)), _id(id)
{}
/**
* Provide a sample for the gauge.
* @param value the measurement for this sample
* @param p the point representing labels for this sample (default empty)
**/
void sample(double value, Point p = Point::empty) const;
// internal
struct Measurement {
using Key = std::pair<MetricId, Point>;
Key idx;
double value;
Measurement() = delete;
Measurement(Key k, double v) : idx(k), value(v) {}
};
using aggregator_type = GaugeAggregator;
using sample_type = Measurement;
};
} // namespace vespalib::metrics
} // namespace vespalib
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