// Copyright 2017 Google Inc. All Rights Reserved.
//
// This file contains the declarations for the Metric class and related
// types.
#ifndef WVCDM_METRICS_METRIC_SERIALIZATION_H_
#define WVCDM_METRICS_METRIC_SERIALIZATION_H_

namespace wvcdm {
namespace metrics {

// The MetricSerializer is implemented by the code that instantiates
// MetricSerializable instances. The caller provides this MetricSerializer
// instance to MetricSerializable::Serialize. In turn, Serialize will make a
// call to Set* for each value to be Serialized. The MetricSerialiable
// implementation may set zero or more values on the MetricSerializer.
class MetricSerializer {
 public:
  virtual ~MetricSerializer() {};

  // The metric_id is the metric name, plus the metric part name, and the
  // metric field name/value string.  E.g.
  //   name: "drm/cdm/decrypt/duration"
  //   part: "mean"
  //   field name/value string: "{error_code:0&buffer_size:1024}"
  // becomes: "drm/cdm/decrypt/duration/mean/{error_code:0&buffer_size:1024}".
  virtual void SetString(const std::string& metric_id,
                         const std::string& value) = 0;
  virtual void SetInt32(const std::string& metric_id, int32_t value) = 0;
  virtual void SetInt64(const std::string& metric_id, int64_t value) = 0;
  virtual void SetDouble(const std::string& metric_id, double value) = 0;
};

// This abstract class merely provides the definition for serializing the value
// of the metric.
class MetricSerializable {
 public:
  virtual ~MetricSerializable() { }
  // Serialize metric values to the MetricSerializer. |serializer| must
  // not be null and is owned by the caller.
  virtual void Serialize(MetricSerializer* serializer) = 0;
};

}  // namespace metrics
}  // namespace wvcdm

#endif  // WVCDM_METRICS_METRIC_SERIALIZATION_H_