output-director.cpp

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/*
  OutputDirector  -  handling all the real external output connections

  Copyright (C)         Lumiera.org
    2011,               Hermann Vosseler <Ichthyostega@web.de>

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 2 of
  the License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

* *****************************************************/


#include "steam/play/play-service.hpp"
#include "steam/play/output-manager.hpp"
#include "steam/play/output-director.hpp"
#include "lib/thread.hpp"

using lib::launchDetached;


namespace steam {
namespace play {
  
  
  
  namespace { // hidden local details of the service implementation....
    
  } // (End) hidden service impl details
  
  
  
  lib::Depend<OutputDirector> OutputDirector::instance;
  
  
  OutputDirector::OutputDirector()
    : player_{PlayServiceHandle::NOT_YET_STARTED}
    , shutdown_initiated_{false}
    { }
  
  OutputDirector::~OutputDirector() { }
  
  
  
  bool
  OutputDirector::connectUp()
  {
    Lock sync{this};
    REQUIRE (not shutdown_initiated_);
    
    player_.createInstance();
    return this->isOperational();
  }
  
  
  bool
  OutputDirector::isOperational()  const
  {
    return bool(player_);   
  }
  
  
  
  void
  OutputDirector::triggerDisconnect (SigTerm completedSignal)  noexcept
  {
    if (not shutdown_initiated_)
      {
        shutdown_initiated_ = true;
        launchDetached ("Output shutdown supervisor"
                       ,[=]{
                             bringDown (completedSignal);
                           });
      }
  }
  
  
  void
  OutputDirector::bringDown (SigTerm completedSignal)
  {
    Lock sync{this};
    string problemLog;
    if (not isOperational())
      {
        WARN (play, "Attempt to OutputDirector::bringDown() -- "
                    "which it is not in running state. Invocation ignored. "
                    "This indicates an error in Lifecycle logic.");
        return;
      }
    try
      {
        TODO ("actually bring down the output generation");
        player_.shutdown();
        
        completedSignal(0);
      }
    
    catch (lumiera::Error& problem)
      {
        problemLog = problem.what();
        lumiera_error(); // reset error state
        completedSignal (&problemLog);
      }
    catch (...)
      {
        problemLog = "Unknown error while disconnecting output. "
                     "Lumiera error flag is = "+string(lumiera_error());
        completedSignal (&problemLog);
      }
  }

}} // namespace steam::play