include/snyder/metrics_registry.h

#ifndef INCLUDE_SNYDER_H_
#define INCLUDE_SNYDER_H_

#include <string>
#include <map>
#include <mutex>

#include "snyder/version.h"

namespace Snyder {

  static const std::string VERSION = SNYDER_VERSION;

  typedef std::map<std::string, uint64_t> MetricsStore;
  typedef struct MetricsSnapshot {
    MetricsStore counters;
    MetricsStore gauges;
  } MetricsSnapshot;

  class MetricsRegistry
  {
    public:
      MetricsRegistry();
      ~MetricsRegistry();

      // generic methods
      void Reset();
      MetricsSnapshot Snapshot();

      // Metrics tracking and retrieval methods
      // Counters
      int Increment(const std::string& name);
      int Increment(const std::string& name, uint64_t count);
      int Decrement(const std::string& name);
      int Decrement(const std::string& name, uint64_t count);

      MetricsStore GetCounters();
      void ResetCounters();

      // Gauges
      int Gauge(const std::string& name, uint64_t value);

      MetricsStore GetGauges();
      void ResetGauges();

    private:
      MetricsRegistry(const MetricsRegistry&) = delete;
      MetricsRegistry(MetricsRegistry&&) = delete;
      MetricsStore counterRegistry;
      MetricsStore gaugesRegistry;
      std::mutex counterMutex;
      std::mutex gaugesMutex;
  };

}

#endif  // INCLUDE_SNYDER_H_