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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;
/**
* Creates new Meter instances.
*/
class MeterProvider
{
public:
virtual ~MeterProvider() = default;
#if OPENTELEMETRY_ABI_VERSION_NO >= 2
/**
* Gets or creates a named Meter instance (ABI).
*
* @since ABI_VERSION 2
*
* @param[in] name Meter instrumentation scope
* @param[in] version Instrumentation scope version
* @param[in] schema_url Instrumentation scope schema URL
* @param[in] attributes Instrumentation scope attributes (optional, may be nullptr)
*/
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;
/**
* Gets or creates a named Meter instance (API helper).
*
* @since ABI_VERSION 2
*
* @param[in] name Meter instrumentation scope
* @param[in] version Instrumentation scope version, optional
* @param[in] schema_url Instrumentation scope schema URL, optional
*/
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);
}
/**
* Gets or creates a named Meter instance (API helper).
*
* @since ABI_VERSION 2
*
* @param[in] name Meter instrumentation scope
* @param[in] version Instrumentation scope version
* @param[in] schema_url Instrumentation scope schema URL
* @param[in] attributes Instrumentation scope attributes
*/
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);
}
/**
* Gets or creates a named Meter instance (API helper).
*
* @since ABI_VERSION 2
*
* @param[in] name Meter instrumentation scope
* @param[in] version Instrumentation scope version
* @param[in] schema_url Instrumentation scope schema URL
* @param[in] attributes Instrumentation scope attributes container
*/
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
/**
* Gets or creates a named Meter instance (ABI)
*
* @since ABI_VERSION 1
*
* @param[in] name Meter instrumentation scope
* @param[in] version Instrumentation scope version, optional
* @param[in] schema_url Instrumentation scope schema URL, optional
*/
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
/**
* Remove a named Meter instance (ABI).
*
* This API is experimental, see
* https://github.com/open-telemetry/opentelemetry-specification/issues/2232
*
* @since ABI_VERSION 2
*
* @param[in] name Meter instrumentation scope
* @param[in] version Instrumentation scope version, optional
* @param[in] schema_url Instrumentation scope schema URL, optional
*/
virtual void RemoveMeter(nostd::string_view name,
nostd::string_view version = "",
nostd::string_view schema_url = "") noexcept = 0;
#endif
};
} // namespace metrics
OPENTELEMETRY_END_NAMESPACE
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