includes/opentelemetry/context/propagation/global_propagator.h

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
 
#pragma once
 
#include <mutex>
 
#include "opentelemetry/context/propagation/noop_propagator.h"
 
#include "opentelemetry/common/macros.h"
#include "opentelemetry/common/spin_lock_mutex.h"
#include "opentelemetry/nostd/shared_ptr.h"
 
#include "opentelemetry/version.h"
 
OPENTELEMETRY_BEGIN_NAMESPACE
namespace context
{
namespace propagation
{
 
class TextMapPropagator;
 
/* Stores the singleton TextMapPropagator */
 
class OPENTELEMETRY_EXPORT GlobalTextMapPropagator
{
public:
  static nostd::shared_ptr<TextMapPropagator> GetGlobalPropagator() noexcept
  {
    std::lock_guard<common::SpinLockMutex> guard(GetLock());
    return nostd::shared_ptr<TextMapPropagator>(GetPropagator());
  }
 
  static void SetGlobalPropagator(const nostd::shared_ptr<TextMapPropagator> &prop) noexcept
  {
    std::lock_guard<common::SpinLockMutex> guard(GetLock());
    GetPropagator() = prop;
  }
 
private:
  OPENTELEMETRY_API_SINGLETON static nostd::shared_ptr<TextMapPropagator> &GetPropagator() noexcept
  {
    static nostd::shared_ptr<TextMapPropagator> propagator(new NoOpPropagator());
    return propagator;
  }
 
  OPENTELEMETRY_API_SINGLETON static common::SpinLockMutex &GetLock() noexcept
  {
    static common::SpinLockMutex lock;
    return lock;
  }
};
 
}  // namespace propagation
}  // namespace context
OPENTELEMETRY_END_NAMESPACE