actor.h

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/*
MIT License
 
Copyright (c) 2025 Luan Young
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#pragma once
 
#include <chrono>
#include <functional>
#include <memory>
#include <mutex>
#include <zmq.hpp>
 
#include "cppzmqzoltanext/czze_export.h"
 
namespace zmqzext {
 
using actor_fn_t = std::function<bool(zmq::socket_t&)>;
 
class CZZE_EXPORT actor_t {
public:
    explicit actor_t(zmq::context_t& context);
 
    actor_t(actor_t const&) = delete;
 
    actor_t& operator=(actor_t const&) = delete;
 
    actor_t(actor_t&& other) noexcept;
 
    actor_t& operator=(actor_t&& other) noexcept;
 
    ~actor_t() noexcept;
 
    void start(actor_fn_t func);
 
    bool stop(std::chrono::milliseconds timeout = std::chrono::milliseconds{-1});
 
    zmq::socket_t& socket() noexcept { return _parent_socket; }
 
    bool is_started() const noexcept { return _started; }
 
    bool is_stopped() const noexcept { return _stopped; }
 
    void set_destructor_timeout(std::chrono::milliseconds timeout) noexcept { _timeout_on_destructor = timeout; }
 
    std::chrono::milliseconds get_destructor_timeout() const noexcept { return _timeout_on_destructor; }
 
private:
    static constexpr std::chrono::milliseconds DEFAULT_DESTRUCTOR_TIMEOUT{100};
 
    struct SharedExceptionState {
        std::mutex exception_mutex;
        std::exception_ptr saved_exception;
    };
 
    static void execute(actor_fn_t func, std::unique_ptr<zmq::socket_t> socket,
                 std::shared_ptr<SharedExceptionState> exception_state) noexcept;
 
    std::string bind_to_unique_address();
 
    zmq::socket_t _parent_socket;
    std::unique_ptr<zmq::socket_t> _child_socket;
    std::shared_ptr<SharedExceptionState> _exception_state;
    bool _started;
    bool _stopped;
    std::chrono::milliseconds _timeout_on_destructor{DEFAULT_DESTRUCTOR_TIMEOUT};
};
 
}  // namespace zmqzext