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