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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#pragma once
#ifndef ENABLE_METRICS_PREVIEW
# include "opentelemetry/metrics/async_instruments.h"
# include "opentelemetry/metrics/meter.h"
# include "opentelemetry/metrics/meter_provider.h"
# include "opentelemetry/metrics/observer_result.h"
# include "opentelemetry/metrics/sync_instruments.h"
# include "opentelemetry/version.h"
OPENTELEMETRY_BEGIN_NAMESPACE
namespace metrics
{
template <class T>
class NoopCounter : public Counter<T>
{
public:
NoopCounter(nostd::string_view name,
nostd::string_view description,
nostd::string_view unit) noexcept
{}
void Add(T value) noexcept override {}
void Add(T value, const opentelemetry::context::Context &context) noexcept override {}
void Add(T value, const common::KeyValueIterable &attributes) noexcept override {}
void Add(T value,
const common::KeyValueIterable &attributes,
const opentelemetry::context::Context &context) noexcept override
{}
};
template <class T>
class NoopHistogram : public Histogram<T>
{
public:
NoopHistogram(nostd::string_view name,
nostd::string_view description,
nostd::string_view unit) noexcept
{}
void Record(T value, const opentelemetry::context::Context &context) noexcept override {}
void Record(T value,
const common::KeyValueIterable &attributes,
const opentelemetry::context::Context &context) noexcept override
{}
};
template <class T>
class NoopUpDownCounter : public UpDownCounter<T>
{
public:
NoopUpDownCounter(nostd::string_view name,
nostd::string_view description,
nostd::string_view unit) noexcept
{}
void Add(T value) noexcept override {}
void Add(T value, const opentelemetry::context::Context &context) noexcept override {}
void Add(T value, const common::KeyValueIterable &attributes) noexcept override {}
void Add(T value,
const common::KeyValueIterable &attributes,
const opentelemetry::context::Context &context) noexcept override
{}
};
template <class T>
class NoopObservableCounter : public ObservableCounter<T>
{
public:
NoopObservableCounter(nostd::string_view name,
void (*callback)(ObserverResult<T> &),
nostd::string_view description,
nostd::string_view unit) noexcept
{}
NoopObservableCounter(nostd::string_view name,
void (*callback)(ObserverResult<T> &, const common::KeyValueIterable &),
nostd::string_view description,
nostd::string_view unit) noexcept
{}
};
template <class T>
class NoopObservableGauge : public ObservableGauge<T>
{
public:
NoopObservableGauge(nostd::string_view name,
void (*callback)(ObserverResult<T> &),
nostd::string_view description,
nostd::string_view unit) noexcept
{}
NoopObservableGauge(nostd::string_view name,
void (*callback)(ObserverResult<T> &, const common::KeyValueIterable &),
nostd::string_view description,
nostd::string_view unit) noexcept
{}
};
template <class T>
class NoopObservableUpDownCounter : public ObservableUpDownCounter<T>
{
public:
NoopObservableUpDownCounter(nostd::string_view name,
void (*callback)(ObserverResult<T> &),
nostd::string_view description,
nostd::string_view unit) noexcept
{}
NoopObservableUpDownCounter(nostd::string_view name,
void (*callback)(ObserverResult<T> &,
const common::KeyValueIterable &),
nostd::string_view description,
nostd::string_view unit) noexcept
{}
};
/**
* No-op implementation of Meter.
*/
class NoopMeter final : public Meter
{
public:
nostd::shared_ptr<Counter<long>> CreateLongCounter(nostd::string_view name,
nostd::string_view description = "",
nostd::string_view unit = "") noexcept override
{
return nostd::shared_ptr<Counter<long>>{new NoopCounter<long>(name, description, unit)};
}
nostd::shared_ptr<Counter<double>> CreateDoubleCounter(
nostd::string_view name,
nostd::string_view description = "",
nostd::string_view unit = "") noexcept override
{
return nostd::shared_ptr<Counter<double>>{new NoopCounter<double>(name, description, unit)};
}
void CreateLongObservableCounter(nostd::string_view name,
void (*callback)(ObserverResult<long> &, void *),
nostd::string_view description = "",
nostd::string_view unit = "",
void *state = nullptr) noexcept override
{}
void CreateDoubleObservableCounter(nostd::string_view name,
void (*callback)(ObserverResult<double> &, void *),
nostd::string_view description = "",
nostd::string_view unit = "",
void *state = nullptr) noexcept override
{}
nostd::shared_ptr<Histogram<long>> CreateLongHistogram(
nostd::string_view name,
nostd::string_view description = "",
nostd::string_view unit = "") noexcept override
{
return nostd::shared_ptr<Histogram<long>>{new NoopHistogram<long>(name, description, unit)};
}
nostd::shared_ptr<Histogram<double>> CreateDoubleHistogram(
nostd::string_view name,
nostd::string_view description = "",
nostd::string_view unit = "") noexcept override
{
return nostd::shared_ptr<Histogram<double>>{new NoopHistogram<double>(name, description, unit)};
}
void CreateLongObservableGauge(nostd::string_view name,
void (*callback)(ObserverResult<long> &, void *),
nostd::string_view description = "",
nostd::string_view unit = "",
void *state = nullptr) noexcept override
{}
void CreateDoubleObservableGauge(nostd::string_view name,
void (*callback)(ObserverResult<double> &, void *),
nostd::string_view description = "",
nostd::string_view unit = "",
void *state = nullptr) noexcept override
{}
nostd::shared_ptr<UpDownCounter<long>> CreateLongUpDownCounter(
nostd::string_view name,
nostd::string_view description = "",
nostd::string_view unit = "") noexcept override
{
return nostd::shared_ptr<UpDownCounter<long>>{
new NoopUpDownCounter<long>(name, description, unit)};
}
nostd::shared_ptr<UpDownCounter<double>> CreateDoubleUpDownCounter(
nostd::string_view name,
nostd::string_view description = "",
nostd::string_view unit = "") noexcept override
{
return nostd::shared_ptr<UpDownCounter<double>>{
new NoopUpDownCounter<double>(name, description, unit)};
}
void CreateLongObservableUpDownCounter(nostd::string_view name,
void (*callback)(ObserverResult<long> &, void *),
nostd::string_view description = "",
nostd::string_view unit = "",
void *state = nullptr) noexcept override
{}
void CreateDoubleObservableUpDownCounter(nostd::string_view name,
void (*callback)(ObserverResult<double> &, void *),
nostd::string_view description = "",
nostd::string_view unit = "",
void *state = nullptr) noexcept override
{}
};
/**
* No-op implementation of a MeterProvider.
*/
class NoopMeterProvider final : public MeterProvider
{
public:
NoopMeterProvider() : meter_{nostd::shared_ptr<Meter>(new NoopMeter)} {}
nostd::shared_ptr<Meter> GetMeter(nostd::string_view library_name,
nostd::string_view library_version,
nostd::string_view schema_url) noexcept override
{
return meter_;
}
private:
nostd::shared_ptr<Meter> meter_;
};
} // namespace metrics
OPENTELEMETRY_END_NAMESPACE
#endif
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