so_5/coop_notification/main.cpp

/*
 * A sample for the exception handler and cooperation notifications.
 */
 
#include <iostream>
#include <stdexcept>
 
// Main SObjectizer header file.
#include <so_5/all.hpp>
 
// A class of an agent which will throw an exception.
class a_child_t final : public so_5::agent_t
{
  public :
    a_child_t( context_t ctx, bool should_throw )
      : so_5::agent_t{ ctx }
      , m_should_throw{ should_throw }
    {}
 
    void so_evt_start() override
    {
      if( m_should_throw )
        throw std::runtime_error( "A child agent failure!" );
    }
 
  private :
    const bool m_should_throw;
};
 
// A class of parent agent.
class a_parent_t final : public so_5::agent_t
{
  public :
    a_parent_t( context_t ctx )
      : so_5::agent_t{ ctx }
      , m_counter{ 0 }
      , m_max_counter{ 3 }
    {}
 
    void so_define_agent() override
    {
      so_default_state()
        .event( &a_parent_t::evt_child_created )
        .event( &a_parent_t::evt_child_destroyed );
    }
 
    void so_evt_start() override
    {
      register_child_coop();
    }
 
  private :
    int m_counter;
    const int m_max_counter;
 
    void evt_child_created(
      const so_5::msg_coop_registered & evt )
    {
      std::cout << "coop_reg: " << evt.m_coop << std::endl;
 
      if( m_counter >= m_max_counter )
        so_deregister_agent_coop_normally();
 
      // Otherwise should wait for cooperation shutdown.
    }
 
    void evt_child_destroyed(
      const so_5::msg_coop_deregistered & evt )
    {
      std::cout << "coop_dereg: " << evt.m_coop
        << ", reason: " << evt.m_reason.reason() << std::endl;
 
      ++m_counter;
      register_child_coop();
    }
 
    void register_child_coop()
    {
      using namespace so_5;
 
      introduce_child_coop( *this,
        [this]( coop_t & coop )
        {
          coop.add_reg_notificator(
              make_coop_reg_notificator( so_direct_mbox() ) );
          coop.add_dereg_notificator(
              make_coop_dereg_notificator( so_direct_mbox() ) );
          coop.set_exception_reaction( deregister_coop_on_exception );
 
          coop.make_agent< a_child_t >( m_counter < m_max_counter );
 
          std::cout << "registering coop: " << coop.handle()
              << std::endl;
        } );
    }
};
 
int main()
{
  try
  {
    so_5::launch(
      // The SObjectizer Environment initialization.
      []( so_5::environment_t & env )
      {
        // Creating and registering a cooperation.
        env.register_agent_as_coop( env.make_agent< a_parent_t >() );
      } );
  }
  catch( const std::exception & ex )
  {
    std::cerr << "Error: " << ex.what() << std::endl;
    return 1;
  }
 
  return 0;
}