so_5/coop_user_resources/main.cpp

/*
 * A sample for the usage of take_under_control method.
 */

#include <iostream>
#include <stdexcept>
#include <string>

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

// Logger sample class.
// Object of that class will be used as user resource for cooperation.
class logger_t
{
  public :
    logger_t()
    {
      std::cout << "[log] -- logger created --" << std::endl;
    }
    ~logger_t()
    {
      std::cout << "[log] -- logger destroyed --" << std::endl;
    }

    void
    log( const std::string & what )
    {
      std::cout << "[log] " << what << std::endl;
    }
};

// A signal for parent cooperation about child work finish.
struct msg_child_finished final : public so_5::signal_t {};

// A class of child agent.
class a_child_t final : public so_5::agent_t
{
  public :
    a_child_t(
      context_t ctx,
      std::string agent_name,
      so_5::mbox_t parent_mbox,
      logger_t & logger )
      : so_5::agent_t( ctx )
      , m_agent_name( std::move( agent_name ) )
      , m_parent_mbox( std::move( parent_mbox ) )
      , m_logger( logger )
    {
      m_logger.log( m_agent_name + ": created" );
    }
    ~a_child_t() override
    {
      m_logger.log( m_agent_name + ": destroyed" );
    }

    void so_evt_start() override
    {
      m_logger.log( m_agent_name + ": finishing" );
      so_5::send< msg_child_finished >( m_parent_mbox );
    }

  private :
    const std::string m_agent_name;
    const so_5::mbox_t m_parent_mbox;
    logger_t & m_logger;
};

// A class of parent agent.
class a_parent_t final : public so_5::agent_t
{
  public :
    a_parent_t(
      context_t ctx,
      logger_t & logger,
      size_t child_count )
      : so_5::agent_t( ctx )
      , m_logger( logger )
      , m_child_count( child_count )
      , m_child_finished( 0 )
    {
      m_logger.log( "parent created" );
    }

    ~a_parent_t() override
    {
      m_logger.log( "parent destroyed" );
    }

    void so_define_agent() override
    {
      so_default_state().event(
          &a_parent_t::evt_child_finished );
    }

    void so_evt_start() override
    {
      m_logger.log( "creating child cooperation..." );
      register_child_coop();
      m_logger.log( "child cooperation created" );
    }

    void evt_child_finished( mhood_t< msg_child_finished > )
    {
      m_logger.log( "child_finished notification received" );

      ++m_child_finished;
      if( m_child_finished >= m_child_count )
      {
        m_logger.log( "stopping so_environment..." );
        so_deregister_agent_coop_normally();
      }
    }

  private :
    logger_t & m_logger;

    const size_t m_child_count;
    size_t m_child_finished;

    void register_child_coop()
    {
      so_5::introduce_child_coop( *this,
        [this]( so_5::coop_t & coop ) 
        {
          for( size_t i = 0; i != m_child_count; ++i )
            coop.make_agent< a_child_t >(
                "a_child_" + std::to_string(i+1),
                so_direct_mbox(), m_logger );
        } );
    }
};

// The SObjectizer Environment initialization.
void init( so_5::environment_t & env )
{
  env.introduce_coop( []( so_5::coop_t & coop ) {
    auto logger = coop.take_under_control( std::make_unique< logger_t >() );
    coop.make_agent< a_parent_t >( *logger, 2u );
  } );
}

int main()
{
  try
  {
    so_5::launch( &init );
  }
  catch( const std::exception & ex )
  {
    std::cerr << "Error: " << ex.what() << std::endl;
    return 1;
  }

  return 0;
}