Program Listing for File global_propagator.h¶
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// Copyright 2021, OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma once
#include <mutex>
#include "opentelemetry/trace/propagation/noop_propagator.h"
#include "opentelemetry/trace/propagation/text_map_propagator.h"
#include "opentelemetry/common/spin_lock_mutex.h"
#include "opentelemetry/nostd/shared_ptr.h"
#include "opentelemetry/version.h"
OPENTELEMETRY_BEGIN_NAMESPACE
namespace trace
{
namespace propagation
{
/* Stores the singleton TextMapPropagator */
class 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(nostd::shared_ptr<TextMapPropagator> prop) noexcept
{
std::lock_guard<common::SpinLockMutex> guard(GetLock());
GetPropagator() = prop;
}
private:
static nostd::shared_ptr<TextMapPropagator> &GetPropagator() noexcept
{
static nostd::shared_ptr<TextMapPropagator> propagator(new NoOpPropagator());
return propagator;
}
static common::SpinLockMutex &GetLock() noexcept
{
static common::SpinLockMutex lock;
return lock;
}
};
} // namespace propagation
} // namespace trace
OPENTELEMETRY_END_NAMESPACE