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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/nostd/shared_ptr.h"
#include "opentelemetry/trace/noop.h"
#include "opentelemetry/trace/tracer_provider.h"
#include "opentelemetry/version.h"
OPENTELEMETRY_BEGIN_NAMESPACE
namespace trace
{
/**
* Stores the singleton global TracerProvider.
*/
class OPENTELEMETRY_EXPORT Provider
{
public:
/**
* Returns the singleton TracerProvider.
*
* By default, a no-op TracerProvider is returned. This will never return a
* nullptr TracerProvider.
*/
static nostd::shared_ptr<TracerProvider> GetTracerProvider() noexcept
{
std::lock_guard<common::SpinLockMutex> guard(GetLock());
return nostd::shared_ptr<TracerProvider>(GetProvider());
}
/**
* Changes the singleton TracerProvider.
*/
static void SetTracerProvider(const nostd::shared_ptr<TracerProvider> &tp) noexcept
{
std::lock_guard<common::SpinLockMutex> guard(GetLock());
GetProvider() = tp;
}
private:
OPENTELEMETRY_API_SINGLETON static nostd::shared_ptr<TracerProvider> &GetProvider() noexcept
{
static nostd::shared_ptr<TracerProvider> provider(new NoopTracerProvider);
return provider;
}
OPENTELEMETRY_API_SINGLETON static common::SpinLockMutex &GetLock() noexcept
{
static common::SpinLockMutex lock;
return lock;
}
};
} // namespace trace
OPENTELEMETRY_END_NAMESPACE
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