includes/opentelemetry/metrics/meter.h

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
 
#pragma once
 
#include "opentelemetry/nostd/shared_ptr.h"
#include "opentelemetry/nostd/string_view.h"
#include "opentelemetry/nostd/unique_ptr.h"
#include "opentelemetry/version.h"
 
OPENTELEMETRY_BEGIN_NAMESPACE
namespace metrics
{
 
template <typename T>
class Counter;
 
template <typename T>
class Histogram;
 
template <typename T>
class UpDownCounter;
 
template <typename T>
class Gauge;
 
class ObservableInstrument;
 
class Meter
{
public:
  virtual ~Meter() = default;
 
  virtual nostd::unique_ptr<Counter<uint64_t>> CreateUInt64Counter(
      nostd::string_view name,
      nostd::string_view description = "",
      nostd::string_view unit        = "") noexcept = 0;
 
  virtual nostd::unique_ptr<Counter<double>> CreateDoubleCounter(
      nostd::string_view name,
      nostd::string_view description = "",
      nostd::string_view unit        = "") noexcept = 0;
 
  virtual nostd::shared_ptr<ObservableInstrument> CreateInt64ObservableCounter(
      nostd::string_view name,
      nostd::string_view description = "",
      nostd::string_view unit        = "") noexcept = 0;
 
  virtual nostd::shared_ptr<ObservableInstrument> CreateDoubleObservableCounter(
      nostd::string_view name,
      nostd::string_view description = "",
      nostd::string_view unit        = "") noexcept = 0;
 
  virtual nostd::unique_ptr<Histogram<uint64_t>> CreateUInt64Histogram(
      nostd::string_view name,
      nostd::string_view description = "",
      nostd::string_view unit        = "") noexcept = 0;
 
  virtual nostd::unique_ptr<Histogram<double>> CreateDoubleHistogram(
      nostd::string_view name,
      nostd::string_view description = "",
      nostd::string_view unit        = "") noexcept = 0;
 
#if OPENTELEMETRY_ABI_VERSION_NO >= 2
 
  virtual nostd::unique_ptr<Gauge<int64_t>> CreateInt64Gauge(
      nostd::string_view name,
      nostd::string_view description = "",
      nostd::string_view unit        = "") noexcept = 0;
 
  virtual nostd::unique_ptr<Gauge<double>> CreateDoubleGauge(
      nostd::string_view name,
      nostd::string_view description = "",
      nostd::string_view unit        = "") noexcept = 0;
#endif
 
  virtual nostd::shared_ptr<ObservableInstrument> CreateInt64ObservableGauge(
      nostd::string_view name,
      nostd::string_view description = "",
      nostd::string_view unit        = "") noexcept = 0;
 
  virtual nostd::shared_ptr<ObservableInstrument> CreateDoubleObservableGauge(
      nostd::string_view name,
      nostd::string_view description = "",
      nostd::string_view unit        = "") noexcept = 0;
 
  virtual nostd::unique_ptr<UpDownCounter<int64_t>> CreateInt64UpDownCounter(
      nostd::string_view name,
      nostd::string_view description = "",
      nostd::string_view unit        = "") noexcept = 0;
 
  virtual nostd::unique_ptr<UpDownCounter<double>> CreateDoubleUpDownCounter(
      nostd::string_view name,
      nostd::string_view description = "",
      nostd::string_view unit        = "") noexcept = 0;
 
  virtual nostd::shared_ptr<ObservableInstrument> CreateInt64ObservableUpDownCounter(
      nostd::string_view name,
      nostd::string_view description = "",
      nostd::string_view unit        = "") noexcept = 0;
 
  virtual nostd::shared_ptr<ObservableInstrument> CreateDoubleObservableUpDownCounter(
      nostd::string_view name,
      nostd::string_view description = "",
      nostd::string_view unit        = "") noexcept = 0;
};
}  // namespace metrics
OPENTELEMETRY_END_NAMESPACE