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#ifndef CERT_TRANS_MONITORING_REGISTRY_H_
#define CERT_TRANS_MONITORING_REGISTRY_H_
#include <mutex>
#include <set>
#include <sstream>
#include "base/macros.h"
namespace cert_trans {
class Metric;
class Registry {
public:
static Registry* Instance();
// Registers a new Metric to be exported.
// |metric| must remain valid for at least the lifetime of this object
void AddMetric(const Metric* metric);
// Resets the registry, removing all references to added Metric objects.
// This method is only for use in testing.
void ResetForTestingOnly();
// Returns the set of currently known metrics.
std::set<const Metric*> GetMetrics() const;
private:
Registry() = default;
mutable std::mutex mutex_;
std::set<const Metric*> metrics_;
friend class RegistryTest;
DISALLOW_COPY_AND_ASSIGN(Registry);
};
} // namespace cert_trans
#endif // CERT_TRANS_MONITORING_REGISTRY_H_
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