so_5/custom_error_logger/main.cpp

/*
 * A sample for the custom error logger.
 */

#include <iostream>
#include <stdexcept>

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

// A class that uses limit_then_redirect incorrectly.
// Message is redirected too many times and this lead to error message.
class actor_t final : public so_5::agent_t
{
  struct hello final : public so_5::signal_t {};
  struct bye final : public so_5::signal_t {};

public :
  actor_t( context_t ctx )
    : so_5::agent_t{ ctx
        // There is a mistake: message is redirected to the same mbox.
        + limit_then_redirect< hello >(
            1, [this]{ return so_direct_mbox(); } )
        + limit_then_abort< bye >( 1 ) }
  {}

  void so_define_agent() override
  {
    so_subscribe_self()
      .event( []( mhood_t<hello> ) { std::cout << "Hello!" << std::endl; } )
      .event( [this]( mhood_t<bye> ) { so_deregister_agent_coop_normally(); } );
  }

  void so_evt_start() override
  {
    so_5::send< hello >( *this );
    so_5::send< hello >( *this ); // This message will be redirected.
    so_5::send< bye >( *this );
  }
};

// Custom error logger.
class custom_logger_t final : public so_5::error_logger_t
{
public :
  custom_logger_t()
  {}

  void log(
    const char * file_name,
    unsigned int line,
    const std::string & message ) override
  {
    std::clog
      << "############################################################\n"
      << file_name << "(" << line << "): error: "
      << message << "\n"
        "############################################################"
      << 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< actor_t >() );
      },
      // Parameters for SObjectizer Environment.
      []( so_5::environment_params_t & params )
      {
        params.error_logger(
          std::make_shared< custom_logger_t >() );
      } );
  }
  catch( const std::exception & ex )
  {
    std::cerr << "Error: " << ex.what() << std::endl;
    return 1;
  }

  return 0;
}