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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#pragma once
#include <cstdint>
#include <memory>
#include <mutex>
#include <vector>
#include "opentelemetry/version.h"
OPENTELEMETRY_BEGIN_NAMESPACE
namespace testing
{
/**
* A locking circular buffer.
*
* Used as a baseline in benchmarking.
*/
template <class T>
class BaselineCircularBuffer
{
public:
explicit BaselineCircularBuffer(size_t max_size) : data_{max_size} {}
/**
* Add an element to the circular buffer.
* @param element the element to add
* @return true if the element was added successfully
*/
bool Add(std::unique_ptr<T> &element) noexcept { return this->Add(std::move(element)); }
bool Add(std::unique_ptr<T> &&element) noexcept
{
std::lock_guard<std::mutex> lock_guard{mutex_};
if (tail_ + data_.size() == head_)
{
return false;
}
data_[head_ % data_.size()] = std::move(element);
head_ += 1;
return true;
}
/**
* Consume elements in the circular buffer.
* @param f the callback to call for each element
*/
template <class F>
void Consume(F f) noexcept
{
std::lock_guard<std::mutex> lock_guard{mutex_};
if (head_ == tail_)
{
return;
}
auto tail_index = tail_ % data_.size();
auto head_index = head_ % data_.size();
if (tail_index < head_index)
{
for (auto i = tail_index; i < head_index; ++i)
{
f(std::move(data_[i]));
}
}
else
{
for (auto i = tail_index; i < data_.size(); ++i)
{
f(std::move(data_[i]));
}
for (auto i = 0ull; i < head_index; ++i)
{
f(std::move(data_[i]));
}
}
tail_ = head_;
}
private:
std::mutex mutex_;
uint64_t head_{0};
uint64_t tail_{0};
std::vector<std::unique_ptr<T>> data_;
};
} // namespace testing
OPENTELEMETRY_END_NAMESPACE
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