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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#pragma once
#include "opentelemetry/common/attribute_value.h"
#include "opentelemetry/common/key_value_iterable_view.h"
#include "opentelemetry/nostd/shared_ptr.h"
#include "opentelemetry/nostd/span.h"
#include "opentelemetry/nostd/string_view.h"
#include "opentelemetry/nostd/type_traits.h"
#include "opentelemetry/nostd/variant.h"
#include "opentelemetry/version.h"
OPENTELEMETRY_BEGIN_NAMESPACE
namespace metrics
{
/**
* ObserverResultT class is necessary for the callback recording asynchronous
* instrument use.
*/
template <class T>
class ObserverResultT
{
public:
ObserverResultT() = default;
ObserverResultT(const ObserverResultT &) = default;
ObserverResultT(ObserverResultT &&) noexcept = default;
ObserverResultT &operator=(const ObserverResultT &) = default;
ObserverResultT &operator=(ObserverResultT &&) noexcept = default;
virtual ~ObserverResultT() = default;
virtual void Observe(T value) noexcept = 0;
virtual void Observe(T value, const common::KeyValueIterable &attributes) noexcept = 0;
template <class U,
nostd::enable_if_t<common::detail::is_key_value_iterable<U>::value> * = nullptr>
void Observe(T value, const U &attributes) noexcept
{
this->Observe(value, common::KeyValueIterableView<U>{attributes});
}
void Observe(T value,
std::initializer_list<std::pair<nostd::string_view, common::AttributeValue>>
attributes) noexcept
{
this->Observe(value, nostd::span<const std::pair<nostd::string_view, common::AttributeValue>>{
attributes.begin(), attributes.end()});
}
};
using ObserverResult = nostd::variant<nostd::shared_ptr<ObserverResultT<int64_t>>,
nostd::shared_ptr<ObserverResultT<double>>>;
} // namespace metrics
OPENTELEMETRY_END_NAMESPACE
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