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9a6788c913
Summary: related to T15261, T15262 - all examples are added to CI checks - as a result, CMakeLists.txt in example folder is reworked to build all examples instead of one - also removed chapter Building with CMake temporarily (it will be back) - all examples accept runtime arguments (brokers, port, clientid) (default: hivemq public broker) - implemented example suggestions by R.Perez, most notable: - all examples include mqtt headers they use (no more unified headers) - multithreaded examples use thread_pool instead of asio::io_context - all examples use logger with log_level::info by default Reviewers: ivica Reviewed By: ivica Subscribers: iljazovic, miljen Differential Revision: https://repo.mireo.local/D32602
107 lines
3.2 KiB
C++
107 lines
3.2 KiB
C++
//
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// Copyright (c) 2023-2024 Ivica Siladic, Bruno Iljazovic, Korina Simicevic
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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//[hello_world_in_multithreaded_env
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#include <iostream>
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#include <string>
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#include <thread>
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#include <vector>
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#include <boost/asio/bind_executor.hpp>
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#include <boost/asio/detached.hpp>
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#include <boost/asio/dispatch.hpp>
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#include <boost/asio/thread_pool.hpp>
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#include <boost/asio/strand.hpp>
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#include <boost/asio/ip/tcp.hpp>
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#include <async_mqtt5/logger.hpp>
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#include <async_mqtt5/mqtt_client.hpp>
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#include <async_mqtt5/reason_codes.hpp>
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#include <async_mqtt5/types.hpp>
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struct config {
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std::string brokers = "broker.hivemq.com";
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uint16_t port = 1883;
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std::string client_id = "async_mqtt5_tester";
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};
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int main(int argc, char** argv) {
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config cfg;
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if (argc == 4) {
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cfg.brokers = argv[1];
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cfg.port = uint16_t(std::stoi(argv[2]));
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cfg.client_id = argv[3];
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}
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// Create a thread pool with 4 threads.
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boost::asio::thread_pool tp(4);
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// Create an explicit strand from thread_pool's executor.
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// The strand guarantees a serialised handler execution regardless of the
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// number of threads running in the thread_pool.
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boost::asio::strand strand = boost::asio::make_strand(tp.get_executor());
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// Create the Client with the explicit strand as the default associated executor.
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async_mqtt5::mqtt_client<
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boost::asio::ip::tcp::socket, std::monostate /* TlsContext */, async_mqtt5::logger
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> client(strand, {} /* tls_context */, async_mqtt5::logger(async_mqtt5::log_level::info));
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// Configure the client.
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client.brokers(cfg.brokers, cfg.port) // Broker that we want to connect to.
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.credentials(cfg.client_id); // Set the Client Identifier. (optional)
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// Start the Client.
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// The async_run function call must be posted/dispatched to the strand.
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boost::asio::dispatch(
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boost::asio::bind_executor(
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strand,
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[&client, &strand, &cfg] {
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// Considering that the default associated executor of all completion handlers is the strand,
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// it is not necessary to explicitly bind it to async_run or other async_xxx's handlers.
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client.async_run(boost::asio::detached); // Start the Client.
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}
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)
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);
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// The async_publish function call must be posted/dispatched to the strand.
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// The associated executor of async_publish's completion handler must be the same strand.
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boost::asio::dispatch(
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boost::asio::bind_executor(
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strand,
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[&client, &strand, &cfg] {
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assert(strand.running_in_this_thread());
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client.async_publish<async_mqtt5::qos_e::at_least_once>(
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"async-mqtt5/test", "Hello World!", async_mqtt5::retain_e::no,
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async_mqtt5::publish_props {},
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// You may bind the strand to this handler, but it is not necessary
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// as the strand is already the default associated handler.
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[&client, &strand](
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async_mqtt5::error_code ec, async_mqtt5::reason_code rc,
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async_mqtt5::puback_props props
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) {
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assert(strand.running_in_this_thread());
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std::cout << ec.message() << std::endl;
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std::cout << rc.message() << std::endl;
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// Stop the Client.
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client.cancel();
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}
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);
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}
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)
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);
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tp.join();
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return 0;
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}
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//]
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