Program Listing for File meter_provider.h

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0

#pragma once

#include "opentelemetry/common/key_value_iterable.h"
#include "opentelemetry/common/key_value_iterable_view.h"
#include "opentelemetry/nostd/shared_ptr.h"
#include "opentelemetry/nostd/string_view.h"
#include "opentelemetry/nostd/type_traits.h"
#include "opentelemetry/version.h"

OPENTELEMETRY_BEGIN_NAMESPACE
namespace metrics
{

class Meter;

class MeterProvider
{
public:
  MeterProvider()                                     = default;
  MeterProvider(const MeterProvider &)                = default;
  MeterProvider(MeterProvider &&) noexcept            = default;
  MeterProvider &operator=(const MeterProvider &)     = default;
  MeterProvider &operator=(MeterProvider &&) noexcept = default;
  virtual ~MeterProvider()                            = default;

#if OPENTELEMETRY_ABI_VERSION_NO >= 2

  virtual nostd::shared_ptr<Meter> GetMeter(
      nostd::string_view name,
      nostd::string_view version,
      nostd::string_view schema_url,
      const common::KeyValueIterable *attributes) noexcept = 0;

  nostd::shared_ptr<Meter> GetMeter(nostd::string_view name,
                                    nostd::string_view version    = "",
                                    nostd::string_view schema_url = "")
  {
    return GetMeter(name, version, schema_url, nullptr);
  }

  nostd::shared_ptr<Meter> GetMeter(
      nostd::string_view name,
      nostd::string_view version,
      nostd::string_view schema_url,
      std::initializer_list<std::pair<nostd::string_view, common::AttributeValue>> attributes)
  {
    /* Build a container from std::initializer_list. */
    nostd::span<const std::pair<nostd::string_view, common::AttributeValue>> attributes_span{
        attributes.begin(), attributes.end()};

    /* Build a view on the container. */
    common::KeyValueIterableView<
        nostd::span<const std::pair<nostd::string_view, common::AttributeValue>>>
        iterable_attributes{attributes_span};

    /* Add attributes using the view. */
    return GetMeter(name, version, schema_url, &iterable_attributes);
  }

  template <class T,
            nostd::enable_if_t<common::detail::is_key_value_iterable<T>::value> * = nullptr>
  nostd::shared_ptr<Meter> GetMeter(nostd::string_view name,
                                    nostd::string_view version,
                                    nostd::string_view schema_url,
                                    const T &attributes)
  {
    /* Build a view on the container. */
    common::KeyValueIterableView<T> iterable_attributes(attributes);

    /* Add attributes using the view. */
    return GetMeter(name, version, schema_url, &iterable_attributes);
  }

#else

  virtual nostd::shared_ptr<Meter> GetMeter(nostd::string_view name,
                                            nostd::string_view version    = "",
                                            nostd::string_view schema_url = "") noexcept = 0;
#endif

#if OPENTELEMETRY_ABI_VERSION_NO >= 2

  virtual void RemoveMeter(nostd::string_view name,
                           nostd::string_view version    = "",
                           nostd::string_view schema_url = "") noexcept = 0;
#endif
};
}  // namespace metrics
OPENTELEMETRY_END_NAMESPACE