cpp-rotor/examples/ping_pong.cpp

//
// Copyright (c) 2019-2020 Ivan Baidakou (basiliscos) (the dot dmol at gmail dot com)
//
// Distributed under the MIT Software License
//

#include "rotor.hpp"
#include <iostream>

struct ping_t {};
struct pong_t {};

struct pinger_t : public rotor::actor_base_t {
    using rotor::actor_base_t::actor_base_t;

    void set_ponger_addr(const rotor::address_ptr_t &addr) { ponger_addr = addr; }

    void configure(rotor::plugin::plugin_base_t &plugin) noexcept override {
        rotor::actor_base_t::configure(plugin);
        plugin.with_casted<rotor::plugin::starter_plugin_t>([](auto &p) { p.subscribe_actor(&pinger_t::on_pong); });
    }

    void on_start() noexcept override {
        rotor::actor_base_t::on_start();
        send<ping_t>(ponger_addr);
    }

    void on_pong(rotor::message_t<pong_t> &) noexcept {
        std::cout << "pong\n";
        supervisor->do_shutdown(); // optional
    }

    rotor::address_ptr_t ponger_addr;
};

struct ponger_t : public rotor::actor_base_t {
    using rotor::actor_base_t::actor_base_t;
    void set_pinger_addr(const rotor::address_ptr_t &addr) { pinger_addr = addr; }

    void configure(rotor::plugin::plugin_base_t &plugin) noexcept override {
        rotor::actor_base_t::configure(plugin);
        plugin.with_casted<rotor::plugin::starter_plugin_t>([](auto &p) { p.subscribe_actor(&ponger_t::on_ping); });
    }

    void on_ping(rotor::message_t<ping_t> &) noexcept {
        std::cout << "ping\n";
        send<pong_t>(pinger_addr);
    }

  private:
    rotor::address_ptr_t pinger_addr;
};

struct dummy_supervisor : public rotor::supervisor_t {
    using rotor::supervisor_t::supervisor_t;

    void do_start_timer(const rotor::pt::time_duration &, rotor::timer_handler_base_t &) noexcept override {}
    void do_cancel_timer(rotor::request_id_t) noexcept override {}
    void start() noexcept override {}
    void shutdown() noexcept override {}
    void enqueue(rotor::message_ptr_t) noexcept override {}
};

int main() {
    rotor::system_context_t ctx{};
    auto timeout = boost::posix_time::milliseconds{500}; /* does not matter */
    auto sup = ctx.create_supervisor<dummy_supervisor>().timeout(timeout).finish();

    auto pinger = sup->create_actor<pinger_t>().init_timeout(timeout).shutdown_timeout(timeout).finish();
    auto ponger = sup->create_actor<ponger_t>().timeout(timeout).finish(); // shortcut for init/shutdown
    pinger->set_ponger_addr(ponger->get_address());
    ponger->set_pinger_addr(pinger->get_address());

    sup->do_process();
    return 0;
}