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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#pragma once
#ifndef ENABLE_METRICS_PREVIEW
# include "opentelemetry/common/key_value_iterable_view.h"
# include "opentelemetry/common/timestamp.h"
# include "opentelemetry/context/context.h"
# include "opentelemetry/sdk/metrics/data/metric_data.h"
# include "opentelemetry/sdk/metrics/instruments.h"
OPENTELEMETRY_BEGIN_NAMESPACE
namespace sdk
{
namespace metrics
{
/* Represent the storage from which to collect the metrics */
class CollectorHandle;
class MetricStorage
{
public:
/* collect the metrics from this storage */
virtual bool Collect(CollectorHandle *collector,
nostd::span<std::shared_ptr<CollectorHandle>> collectors,
opentelemetry::common::SystemTimestamp sdk_start_ts,
opentelemetry::common::SystemTimestamp collection_ts,
nostd::function_ref<bool(MetricData)> callback) noexcept = 0;
};
class WritableMetricStorage
{
public:
virtual void RecordLong(long value, const opentelemetry::context::Context &context) noexcept = 0;
virtual void RecordLong(long value,
const opentelemetry::common::KeyValueIterable &attributes,
const opentelemetry::context::Context &context) noexcept = 0;
virtual void RecordDouble(double value,
const opentelemetry::context::Context &context) noexcept = 0;
virtual void RecordDouble(double value,
const opentelemetry::common::KeyValueIterable &attributes,
const opentelemetry::context::Context &context) noexcept = 0;
virtual ~WritableMetricStorage() = default;
};
class NoopMetricStorage : public MetricStorage
{
public:
bool Collect(CollectorHandle *collector,
nostd::span<std::shared_ptr<CollectorHandle>> collectors,
opentelemetry::common::SystemTimestamp sdk_start_ts,
opentelemetry::common::SystemTimestamp collection_ts,
nostd::function_ref<bool(MetricData)> callback) noexcept override
{
MetricData metric_data;
return callback(std::move(metric_data));
}
};
class NoopWritableMetricStorage : public WritableMetricStorage
{
public:
void RecordLong(long value, const opentelemetry::context::Context &context) noexcept = 0;
void RecordLong(long value,
const opentelemetry::common::KeyValueIterable &attributes,
const opentelemetry::context::Context &context) noexcept override
{}
void RecordDouble(double value, const opentelemetry::context::Context &context) noexcept override
{}
void RecordDouble(double value,
const opentelemetry::common::KeyValueIterable &attributes,
const opentelemetry::context::Context &context) noexcept override
{}
};
} // namespace metrics
} // namespace sdk
OPENTELEMETRY_END_NAMESPACE
#endif
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