includes/opentelemetry/sdk/trace/samplers/parent.h

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
 
#pragma once
 
#include <memory>
#include <string>
 
#include "opentelemetry/common/key_value_iterable.h"
#include "opentelemetry/nostd/string_view.h"
#include "opentelemetry/sdk/trace/sampler.h"
#include "opentelemetry/sdk/trace/samplers/always_off.h"
#include "opentelemetry/sdk/trace/samplers/always_on.h"
#include "opentelemetry/trace/span_context.h"
#include "opentelemetry/trace/span_metadata.h"
#include "opentelemetry/trace/trace_id.h"
#include "opentelemetry/version.h"
 
OPENTELEMETRY_BEGIN_NAMESPACE
namespace sdk
{
namespace trace
{
 
class ParentBasedSampler : public Sampler
{
public:
  explicit ParentBasedSampler(const std::shared_ptr<Sampler> &root_sampler,
                              const std::shared_ptr<Sampler> &remote_parent_sampled_sampler =
                                  std::make_shared<AlwaysOnSampler>(),
                              const std::shared_ptr<Sampler> &remote_parent_nonsampled_sampler =
                                  std::make_shared<AlwaysOffSampler>(),
                              const std::shared_ptr<Sampler> &local_parent_sampled_sampler =
                                  std::make_shared<AlwaysOnSampler>(),
                              const std::shared_ptr<Sampler> &local_parent_nonsampled_sampler =
                                  std::make_shared<AlwaysOffSampler>()) noexcept;
 
  SamplingResult ShouldSample(
      const opentelemetry::trace::SpanContext &parent_context,
      opentelemetry::trace::TraceId trace_id,
      nostd::string_view name,
      opentelemetry::trace::SpanKind span_kind,
      const opentelemetry::common::KeyValueIterable &attributes,
      const opentelemetry::trace::SpanContextKeyValueIterable &links) noexcept override;
 
  nostd::string_view GetDescription() const noexcept override;
 
private:
  const std::shared_ptr<Sampler> root_sampler_;
  const std::shared_ptr<Sampler> remote_parent_sampled_sampler_;
  const std::shared_ptr<Sampler> remote_parent_nonsampled_sampler_;
  const std::shared_ptr<Sampler> local_parent_sampled_sampler_;
  const std::shared_ptr<Sampler> local_parent_nonsampled_sampler_;
  const std::string description_;
};
 
}  // namespace trace
}  // namespace sdk
OPENTELEMETRY_END_NAMESPACE