so_5/hello_delay/main.cpp

/*
 * A sample of a simple agent which send a delayed message to itself.
 */

#if defined( _MSC_VER )
  #if defined( __clang__ )
    #pragma clang diagnostic ignored "-Wreserved-id-macro"
  #endif
  #define _CRT_SECURE_NO_WARNINGS
#endif

#include <iostream>
#include <ctime>

// Main SObjectizer header files.
#include <so_5/all.hpp>

// Hello message.
struct msg_hello
{
  // Greeting.
  std::string m_message;
};

// Stop message.
class msg_stop_signal final : public so_5::signal_t {};

// An agent class.
class a_hello_t final : public so_5::agent_t
{
  public:
    using so_5::agent_t::agent_t;

    // Definition of an agent for SObjectizer.
    void so_define_agent() override;

    // A reaction to start of work in SObjectizer.
    void so_evt_start() override;

  private:
    // Delayed message handler.
    void evt_hello_delay( const msg_hello & msg );

    // Stop signal handler.
    void evt_stop_signal( mhood_t<msg_stop_signal> );

    // Helper function for printing messages.
    static void show_message( const std::string & what );
};

void a_hello_t::so_define_agent()
{
  // Message subscription.
  so_subscribe_self().event( &a_hello_t::evt_hello_delay );

  so_subscribe_self().event( &a_hello_t::evt_stop_signal );
}

void a_hello_t::so_evt_start()
{
  show_message( "a_hello_t::so_evt_start()" );

  so_5::send_delayed< msg_hello >(
    *this,
    std::chrono::seconds( 2 ),
    "Hello, world! This is SObjectizer v.5." );
}

void a_hello_t::evt_hello_delay( const msg_hello & msg )
{
  show_message( msg.m_message );

  so_5::send_delayed< msg_stop_signal >(
    *this,
    std::chrono::seconds( 2 ) );
}

void a_hello_t::evt_stop_signal( mhood_t<msg_stop_signal> )
{
  show_message( "Stop SObjectizer..." );

  // Shutting down SObjectizer.
  so_environment().stop();
}

void a_hello_t::show_message( const std::string & what )
{
  time_t t = time( nullptr );
  std::cout << std::asctime( std::localtime( &t ) ) << what << std::endl;
}

int main()
{
  try
  {
    so_5::launch(
      []( so_5::environment_t & env )
      {
        env.register_agent_as_coop( env.make_agent< a_hello_t >() );
      } );
  }
  catch( const std::exception & ex )
  {
    std::cerr << "Error: " << ex.what() << std::endl;
    return 1;
  }

  return 0;
}