Program Listing for File provider.h

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#pragma once

#include <mutex>

#include "opentelemetry/common/spin_lock_mutex.h"
#include "opentelemetry/nostd/shared_ptr.h"
#include "opentelemetry/trace/noop.h"
#include "opentelemetry/trace/tracer_provider.h"

OPENTELEMETRY_BEGIN_NAMESPACE
namespace trace
{
class Provider
{
public:
  static nostd::shared_ptr<TracerProvider> GetTracerProvider() noexcept
  {
    std::lock_guard<common::SpinLockMutex> guard(GetLock());
    return nostd::shared_ptr<TracerProvider>(GetProvider());
  }

  static void SetTracerProvider(nostd::shared_ptr<TracerProvider> tp) noexcept
  {
    std::lock_guard<common::SpinLockMutex> guard(GetLock());
    GetProvider() = tp;
  }

private:
  static nostd::shared_ptr<TracerProvider> &GetProvider() noexcept
  {
    static nostd::shared_ptr<TracerProvider> provider(new NoopTracerProvider);
    return provider;
  }

  static common::SpinLockMutex &GetLock() noexcept
  {
    static common::SpinLockMutex lock;
    return lock;
  }
};

}  // namespace trace
OPENTELEMETRY_END_NAMESPACE