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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#pragma once
#ifndef ENABLE_METRICS_PREVIEW
# include "opentelemetry/common/attribute_value.h"
# include "opentelemetry/common/key_value_iterable_view.h"
# include "opentelemetry/context/context.h"
# include "opentelemetry/nostd/span.h"
# include "opentelemetry/nostd/string_view.h"
# include "opentelemetry/nostd/type_traits.h"
OPENTELEMETRY_BEGIN_NAMESPACE
namespace metrics
{
class SynchronousInstrument
{};
template <class T>
class Counter : public SynchronousInstrument
{
public:
/**
* Add adds the value to the counter's sum
*
* @param value The increment amount. MUST be non-negative.
*/
virtual void Add(T value) noexcept = 0;
virtual void Add(T value, const opentelemetry::context::Context &context) noexcept = 0;
/**
* Add adds the value to the counter's sum. The attributes should contain
* the keys and values to be associated with this value. Counters only
* accept positive valued updates.
*
* @param value The increment amount. MUST be non-negative.
* @param attributes the set of attributes, as key-value pairs
*/
virtual void Add(T value, const common::KeyValueIterable &attributes) noexcept = 0;
virtual void Add(T value,
const common::KeyValueIterable &attributes,
const opentelemetry::context::Context &context) noexcept = 0;
template <class U,
nostd::enable_if_t<common::detail::is_key_value_iterable<U>::value> * = nullptr>
void Add(T value, const U &attributes) noexcept
{
auto context = opentelemetry::context::Context{};
this->Add(value, common::KeyValueIterableView<U>{attributes}, context);
}
template <class U,
nostd::enable_if_t<common::detail::is_key_value_iterable<U>::value> * = nullptr>
void Add(T value, const U &attributes, const opentelemetry::context::Context &context) noexcept
{
this->Add(value, common::KeyValueIterableView<U>{attributes}, context);
}
void Add(T value,
std::initializer_list<std::pair<nostd::string_view, common::AttributeValue>>
attributes) noexcept
{
auto context = opentelemetry::context::Context{};
this->Add(value,
nostd::span<const std::pair<nostd::string_view, common::AttributeValue>>{
attributes.begin(), attributes.end()},
context);
}
void Add(T value,
std::initializer_list<std::pair<nostd::string_view, common::AttributeValue>> attributes,
const opentelemetry::context::Context &context) noexcept
{
this->Add(value,
nostd::span<const std::pair<nostd::string_view, common::AttributeValue>>{
attributes.begin(), attributes.end()},
context);
}
};
/** A histogram instrument that records values. */
template <class T>
class Histogram : public SynchronousInstrument
{
public:
/**
* Records a value.
*
* @param value The increment amount. May be positive, negative or zero.
*/
virtual void Record(T value, const opentelemetry::context::Context &context) noexcept = 0;
/**
* Records a value with a set of attributes.
*
* @param value The increment amount. May be positive, negative or zero.
* @param attributes A set of attributes to associate with the count.
*/
virtual void Record(T value,
const common::KeyValueIterable &attributes,
const opentelemetry::context::Context &context) noexcept = 0;
template <class U,
nostd::enable_if_t<common::detail::is_key_value_iterable<U>::value> * = nullptr>
void Record(T value, const U &attributes, const opentelemetry::context::Context &context) noexcept
{
this->Record(value, common::KeyValueIterableView<U>{attributes}, context);
}
void Record(
T value,
std::initializer_list<std::pair<nostd::string_view, common::AttributeValue>> attributes,
const opentelemetry::context::Context &context) noexcept
{
this->Record(value,
nostd::span<const std::pair<nostd::string_view, common::AttributeValue>>{
attributes.begin(), attributes.end()},
context);
}
};
/** An up-down-counter instrument that adds or reduce values. */
template <class T>
class UpDownCounter : public SynchronousInstrument
{
public:
/**
* Adds a value.
*
* @param value The amount of the measurement.
*/
virtual void Add(T value) noexcept = 0;
virtual void Add(T value, const opentelemetry::context::Context &context) noexcept = 0;
/**
* Add a value with a set of attributes.
*
* @param value The increment amount. May be positive, negative or zero.
* @param attributes A set of attributes to associate with the count.
*/
virtual void Add(T value, const common::KeyValueIterable &attributes) noexcept = 0;
virtual void Add(T value,
const common::KeyValueIterable &attributes,
const opentelemetry::context::Context &context) noexcept = 0;
template <class U,
nostd::enable_if_t<common::detail::is_key_value_iterable<U>::value> * = nullptr>
void Add(T value, const U &attributes) noexcept
{
auto context = opentelemetry::context::Context{};
this->Add(value, common::KeyValueIterableView<U>{attributes}, context);
}
template <class U,
nostd::enable_if_t<common::detail::is_key_value_iterable<U>::value> * = nullptr>
void Add(T value, const U &attributes, const opentelemetry::context::Context &context) noexcept
{
this->Add(value, common::KeyValueIterableView<U>{attributes}, context);
}
void Add(T value,
std::initializer_list<std::pair<nostd::string_view, common::AttributeValue>>
attributes) noexcept
{
auto context = opentelemetry::context::Context{};
this->Add(value,
nostd::span<const std::pair<nostd::string_view, common::AttributeValue>>{
attributes.begin(), attributes.end()},
context);
}
void Add(T value,
std::initializer_list<std::pair<nostd::string_view, common::AttributeValue>> attributes,
const opentelemetry::context::Context &context) noexcept
{
this->Add(value,
nostd::span<const std::pair<nostd::string_view, common::AttributeValue>>{
attributes.begin(), attributes.end()},
context);
}
};
} // namespace metrics
OPENTELEMETRY_END_NAMESPACE
#endif
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