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#ifndef CERT_TRANS_MONITORING_METRIC_H_
#define CERT_TRANS_MONITORING_METRIC_H_
#include <map>
#include <ostream>
#include <set>
#include <string>
#include <vector>
#include "base/macros.h"
#include "monitoring/registry.h"
namespace cert_trans {
// As pointless as this looks, it's crucial in order to be able to specify that
// we want as many |name| typed args as there are LabelTypes... in the Metric
// class below.
template <class... F>
struct NameType {
typedef const std::string& name;
};
// Base class for all metric types
class Metric {
public:
typedef std::pair<std::chrono::system_clock::time_point, double>
TimestampedValue;
enum Type {
COUNTER,
GAUGE,
};
Type Type() const {
return type_;
}
// Returns the name of this metric
const std::string& Name() const {
return name_;
}
// Returns the name of each of the labels this metric has, in the same order
// as the LabelTypes were specified.
const std::vector<std::string>& LabelNames() const {
return label_names_;
}
// Returns the i'th label name.
const std::string& LabelName(size_t i) const {
return label_names_[i];
}
// Returns the help string associated with this metric.
const std::string& Help() const {
return help_;
}
bool operator<(const Metric& rhs) const {
return name_ < rhs.name_;
}
// TODO(alcutter): Not over the moon about having this here, but it'll do for
// now.
virtual std::map<std::vector<std::string>, TimestampedValue> CurrentValues()
const = 0;
protected:
Metric(enum Type type, const std::string& name,
const std::vector<std::string>& label_names, const std::string& help)
: type_(type), name_(name), label_names_(label_names), help_(help) {
Registry::Instance()->AddMetric(this);
}
virtual ~Metric() = default;
private:
const enum Type type_;
const std::string name_;
const std::vector<std::string> label_names_;
const std::string help_;
friend class CounterTest;
friend class GaugeTest;
DISALLOW_COPY_AND_ASSIGN(Metric);
};
} // namespace cert_trans
#endif // CERT_TRANS_MONITORING_METRIC_H_
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