examples/ExampleAsyncProducer.cpp

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
#include <algorithm>
#include <atomic>
#include <condition_variable>
#include <iostream>
#include <mutex>
#include <random>
#include <system_error>

#include "rocketmq/Message.h"
#include "rocketmq/Producer.h"

using namespace ROCKETMQ_NAMESPACE;

const std::string& alphaNumeric() {
  static std::string alpha_numeric("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ");
  return alpha_numeric;
}

std::string randomString(std::string::size_type len) {
  std::string result;
  result.reserve(len);
  std::random_device rd;
  std::mt19937 generator(rd());
  std::string source(alphaNumeric());
  std::string::size_type generated = 0;
  while (generated < len) {
    std::shuffle(source.begin(), source.end(), generator);
    std::string::size_type delta = std::min({len - generated, source.length()});
    result.append(source.substr(0, delta));
    generated += delta;
  }
  return result;
}

int main(int argc, char* argv[]) {
  const char* topic = "cpp_sdk_standard";
  const char* name_server = "11.166.42.94:8081";

  auto producer =
      Producer::newBuilder().withConfiguration(Configuration::newBuilder().withEndpoints(name_server).build()).build();

  std::atomic_bool stopped;
  std::atomic_long count(0);

  auto stats_lambda = [&] {
    while (!stopped.load(std::memory_order_relaxed)) {
      long cnt = count.load(std::memory_order_relaxed);
      while (count.compare_exchange_weak(cnt, 0)) {
        break;
      }
      std::this_thread::sleep_for(std::chrono::seconds(1));
      std::cout << "QPS: " << cnt << std::endl;
    }
  };

  std::thread stats_thread(stats_lambda);

  std::string body = randomString(1024 * 4);
  std::cout << "Message body size: " << body.length() << std::endl;

  std::size_t total = 256;
  std::size_t completed = 0;
  std::mutex mtx;
  std::condition_variable cv;

  try {
    auto send_callback = [&](const std::error_code& ec, const SendReceipt& receipt) {
      std::unique_lock<std::mutex> lk(mtx);
      completed++;
      count++;
      std::cout << "Message[id=" << receipt.message_id << "] sent" << std::endl;
      if (completed >= total) {
        cv.notify_all();
      }
    };

    for (std::size_t i = 0; i < total; ++i) {
      auto message = Message::newBuilder().withTopic(topic).withTag("TagA").withKeys({"Key-0"}).withBody(body).build();
      producer.send(std::move(message), send_callback);
    }

    {
      std::unique_lock<std::mutex> lk(mtx);
      cv.wait(lk, [&]() { return completed >= total; });
    }
  } catch (...) {
    std::cerr << "Ah...No!!!" << std::endl;
  }
  stopped.store(true, std::memory_order_relaxed);
  if (stats_thread.joinable()) {
    stats_thread.join();
  }

  std::this_thread::sleep_for(std::chrono::seconds(1));

  return EXIT_SUCCESS;
}