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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#include "opentelemetry/sdk/common/circular_buffer.h"
#include <algorithm>
#include <cassert>
#include <random>
#include <thread>
#include <gtest/gtest.h>
using opentelemetry::sdk::common::AtomicUniquePtr;
using opentelemetry::sdk::common::CircularBuffer;
using opentelemetry::sdk::common::CircularBufferRange;
static thread_local std::mt19937 RandomNumberGenerator{std::random_device{}()};
static void GenerateRandomNumbers(CircularBuffer<uint32_t> &buffer,
std::vector<uint32_t> &numbers,
int n)
{
for (int i = 0; i < n; ++i)
{
auto value = static_cast<uint32_t>(RandomNumberGenerator());
std::unique_ptr<uint32_t> x{new uint32_t{value}};
if (buffer.Add(x))
{
numbers.push_back(value);
}
}
}
static void RunNumberProducers(CircularBuffer<uint32_t> &buffer,
std::vector<uint32_t> &numbers,
int num_threads,
int n)
{
std::vector<std::vector<uint32_t>> thread_numbers(num_threads);
std::vector<std::thread> threads(num_threads);
for (int thread_index = 0; thread_index < num_threads; ++thread_index)
{
threads[thread_index] = std::thread{GenerateRandomNumbers, std::ref(buffer),
std::ref(thread_numbers[thread_index]), n};
}
for (auto &thread : threads)
{
thread.join();
}
for (int thread_index = 0; thread_index < num_threads; ++thread_index)
{
numbers.insert(numbers.end(), thread_numbers[thread_index].begin(),
thread_numbers[thread_index].end());
}
}
void RunNumberConsumer(CircularBuffer<uint32_t> &buffer,
std::atomic<bool> &exit,
std::vector<uint32_t> &numbers)
{
while (true)
{
if (exit && buffer.Peek().empty())
{
return;
}
auto n = std::uniform_int_distribution<size_t>{0, buffer.Peek().size()}(RandomNumberGenerator);
buffer.Consume(n, [&](CircularBufferRange<AtomicUniquePtr<uint32_t>> range) noexcept {
assert(range.size() == n);
range.ForEach([&](AtomicUniquePtr<uint32_t> &ptr) noexcept {
assert(!ptr.IsNull());
numbers.push_back(*ptr);
ptr.Reset();
return true;
});
});
}
}
TEST(CircularBufferTest, Add)
{
CircularBuffer<int> buffer{10};
std::unique_ptr<int> x{new int{11}};
EXPECT_TRUE(buffer.Add(x));
EXPECT_EQ(x, nullptr);
auto range = buffer.Peek();
EXPECT_EQ(range.size(), 1);
range.ForEach([](const AtomicUniquePtr<int> &y) {
EXPECT_EQ(*y, 11);
return true;
});
}
TEST(CircularBufferTest, Clear)
{
CircularBuffer<int> buffer{10};
std::unique_ptr<int> x{new int{11}};
EXPECT_TRUE(buffer.Add(x));
EXPECT_EQ(x, nullptr);
buffer.Clear();
EXPECT_TRUE(buffer.empty());
}
TEST(CircularBufferTest, AddOnFull)
{
CircularBuffer<int> buffer{10};
for (int i = 0; i < static_cast<int>(buffer.max_size()); ++i)
{
std::unique_ptr<int> x{new int{i}};
EXPECT_TRUE(buffer.Add(x));
}
std::unique_ptr<int> x{new int{33}};
EXPECT_FALSE(buffer.Add(x));
EXPECT_NE(x, nullptr);
EXPECT_EQ(*x, 33);
}
TEST(CircularBufferTest, Consume)
{
CircularBuffer<int> buffer{10};
for (int i = 0; i < static_cast<int>(buffer.max_size()); ++i)
{
std::unique_ptr<int> x{new int{i}};
EXPECT_TRUE(buffer.Add(x));
}
int count = 0;
buffer.Consume(5, [&](CircularBufferRange<AtomicUniquePtr<int>> range) noexcept {
range.ForEach([&](AtomicUniquePtr<int> &ptr) {
EXPECT_EQ(*ptr, count++);
ptr.Reset();
return true;
});
});
EXPECT_EQ(count, 5);
}
TEST(CircularBufferTest, Simulation)
{
const int num_producer_threads = 4;
const int n = 25000;
for (size_t max_size : {1, 2, 10, 50, 100, 1000})
{
CircularBuffer<uint32_t> buffer{max_size};
std::vector<uint32_t> producer_numbers;
std::vector<uint32_t> consumer_numbers;
auto producers = std::thread{RunNumberProducers, std::ref(buffer), std::ref(producer_numbers),
num_producer_threads, n};
std::atomic<bool> exit{false};
auto consumer = std::thread{RunNumberConsumer, std::ref(buffer), std::ref(exit),
std::ref(consumer_numbers)};
producers.join();
exit = true;
consumer.join();
std::sort(producer_numbers.begin(), producer_numbers.end());
std::sort(consumer_numbers.begin(), consumer_numbers.end());
EXPECT_EQ(producer_numbers.size(), consumer_numbers.size());
EXPECT_EQ(producer_numbers, consumer_numbers);
}
}
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