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#ifndef CERT_TRANS_MONITORING_GAUGE_H_
#define CERT_TRANS_MONITORING_GAUGE_H_
#include <chrono>
#include <mutex>
#include <string>
#include "base/macros.h"
#include "monitoring/labelled_values.h"
#include "monitoring/metric.h"
namespace cert_trans {
// A metric whose values can go down as well as up (e.g. memory usage.)
template <class... LabelTypes>
class Gauge : public Metric {
public:
static Gauge<LabelTypes...>* New(
const std::string& name,
const typename NameType<LabelTypes>::name&... label_names,
const std::string& help);
double Get(const LabelTypes&...) const;
void Set(const LabelTypes&... labels, double value);
// TODO(alcutter): Not over the moon about having this here.
std::map<std::vector<std::string>, Metric::TimestampedValue> CurrentValues()
const override;
private:
Gauge(const std::string& name,
const typename NameType<LabelTypes>::name&... label_names,
const std::string& help);
LabelledValues<LabelTypes...> values_;
DISALLOW_COPY_AND_ASSIGN(Gauge);
};
// static
template <class... LabelTypes>
Gauge<LabelTypes...>* Gauge<LabelTypes...>::New(
const std::string& name,
const typename NameType<LabelTypes>::name&... label_names,
const std::string& help) {
return new Gauge(name, label_names..., help);
}
template <class... LabelTypes>
Gauge<LabelTypes...>::Gauge(
const std::string& name,
const typename NameType<LabelTypes>::name&... label_names,
const std::string& help)
: Metric(GAUGE, name, {label_names...}, help),
values_(name, label_names...) {
}
template <class... LabelTypes>
double Gauge<LabelTypes...>::Get(const LabelTypes&... labels) const {
return values_.Get(labels...);
}
template <class... LabelTypes>
void Gauge<LabelTypes...>::Set(const LabelTypes&... labels, double value) {
values_.Set(labels..., value);
}
template <class... LabelTypes>
std::map<std::vector<std::string>, Metric::TimestampedValue>
Gauge<LabelTypes...>::CurrentValues() const {
return values_.CurrentValues();
}
} // namespace cert_trans
#endif // CERT_TRANS_MONITORING_GAUGE_H_
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