9.2/includes/opentelemetry/metrics/provider.h

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
 
#pragma once
 
#include <mutex>
 
#include "opentelemetry/common/spin_lock_mutex.h"
#include "opentelemetry/metrics/meter_provider.h"
#include "opentelemetry/metrics/noop.h"
#include "opentelemetry/nostd/shared_ptr.h"
#include "opentelemetry/version.h"
 
OPENTELEMETRY_BEGIN_NAMESPACE
namespace metrics
{
 
class Provider
{
public:
  static nostd::shared_ptr<MeterProvider> GetMeterProvider() noexcept
  {
    std::lock_guard<common::SpinLockMutex> guard(GetLock());
    return nostd::shared_ptr<MeterProvider>(GetProvider());
  }
 
  static void SetMeterProvider(const nostd::shared_ptr<MeterProvider> &tp) noexcept
  {
    std::lock_guard<common::SpinLockMutex> guard(GetLock());
    GetProvider() = tp;
  }
 
private:
  OPENTELEMETRY_API_SINGLETON static nostd::shared_ptr<MeterProvider> &GetProvider() noexcept
  {
    static nostd::shared_ptr<MeterProvider> provider(new NoopMeterProvider);
    return provider;
  }
 
  OPENTELEMETRY_API_SINGLETON static common::SpinLockMutex &GetLock() noexcept
  {
    static common::SpinLockMutex lock;
    return lock;
  }
};
 
}  // namespace metrics
OPENTELEMETRY_END_NAMESPACE