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QtReactor.cpp

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#include "ace_pch.h"
//$Id: QtReactor.cpp,v 1.1.1.3.2.1 2003/03/13 19:44:22 chad Exp $
#include "ace/QtReactor.h"

#if defined (ACE_HAS_QT)

ACE_ALLOC_HOOK_DEFINE (ACE_QtReactor)

// Must be called with lock held
ACE_QtReactor::ACE_QtReactor (QApplication *qapp,
                              size_t size,
                              int restart,
                              ACE_Sig_Handler *handler)
  : ACE_Select_Reactor(size, restart, handler),
    qapp_(qapp),
    qtime_ (0)

{
  // When the ACE_Select_Reactor is constructed it creates the notify
  // pipe and registers it with the register_handler_i() method. The
  // QtReactor overloads this method BUT because the
  // register_handler_i occurs when constructing the base class
  // ACE_Select_Reactor, the ACE_Select_Reactor register_handler_i()
  // is called not the QtReactor register_handler_i().  This means
  // that the notify pipe is registered with the ACE_Select_Reactor
  // event handling code not the QtReactor and so notfications don't
  // work.  To get around this we simply close and re-opened the
  // notification handler in the constructor of the QtReactor.

#if defined (ACE_MT_SAFE) && (ACE_MT_SAFE != 0)
  this->notify_handler_->close ();

  // Patch for MS Windows: close and open doesn't clear the read
  // fd_set, so reset it manually
  this->wait_set_.rd_mask_.reset ();

  this->notify_handler_->open (this, 0);
#endif /* ACE_MT_SAFE */
}

ACE_QtReactor::~ACE_QtReactor (void)
{
  //no-op
}

void
ACE_QtReactor::qapplication (QApplication *qapp)
{
  qapp_ = qapp ;
}

int
ACE_QtReactor::wait_for_multiple_events (ACE_Select_Reactor_Handle_Set &handle_set,
                                         ACE_Time_Value *max_wait_time)
{
  ACE_TRACE( "ACE_QtReactor::wait_for_multiple_events" );

  int nfound = 0;
  do
  {
    max_wait_time = this->timer_queue_->calculate_timeout (max_wait_time);
    size_t width = this->handler_rep_.max_handlep1 ();
    handle_set.rd_mask_ = this->wait_set_.rd_mask_;
    handle_set.wr_mask_ = this->wait_set_.wr_mask_;
    handle_set.ex_mask_ = this->wait_set_.ex_mask_;

    nfound = QtWaitForMultipleEvents (width,
                                      handle_set,
                                      max_wait_time);

  } while( nfound == -1 && this->handle_error () > 0 );

  if (nfound > 0)
  {
#if !defined (ACE_WIN32)
    handle_set.rd_mask_.sync (this->handler_rep_.max_handlep1 ());
    handle_set.wr_mask_.sync (this->handler_rep_.max_handlep1 ());
    handle_set.ex_mask_.sync (this->handler_rep_.max_handlep1 ());
#endif /* ACE_WIN32 */
  }

  return nfound;
  // Timed out or input available
}

void
ACE_QtReactor::timeout_event (void)
{
  // Deal with any timer events
  ACE_Select_Reactor_Handle_Set handle_set;
  this->dispatch (0, handle_set );

  // Set next timeout signal
  this->reset_timeout ();
}

void
ACE_QtReactor::read_event (int handle)
{
  // Send read event
  ACE_Select_Reactor_Handle_Set dispatch_set;

  dispatch_set.rd_mask_.set_bit (ACE_HANDLE(handle));
  this->dispatch (1, dispatch_set);
}

void
ACE_QtReactor::write_event (int handle)
{
  // Send write event
  ACE_Select_Reactor_Handle_Set dispatch_set;

  dispatch_set.wr_mask_.set_bit (ACE_HANDLE(handle));
  this->dispatch (1, dispatch_set);
}

void
ACE_QtReactor::exception_event (int handle)
{
  // Send exception event
  ACE_Select_Reactor_Handle_Set dispatch_set;

  dispatch_set.ex_mask_.set_bit(ACE_HANDLE(handle));
  dispatch (1, dispatch_set);
}

int
ACE_QtReactor::QtWaitForMultipleEvents (int width,
                                        ACE_Select_Reactor_Handle_Set &wait_set,
                                        ACE_Time_Value */*max_wait_time*/)
{
  // Check to make sure our handle's are all usable.
  ACE_Select_Reactor_Handle_Set temp_set = wait_set;

  if (ACE_OS::select (width,
                      temp_set.rd_mask_,
                      temp_set.wr_mask_,
                      temp_set.ex_mask_,
                      (ACE_Time_Value *) &ACE_Time_Value::zero ) == -1)
    return -1; // Bad file arguments...

  // Qt processing.
  this->qapp_->processOneEvent () ;

  // Reset the width, in case it changed during the upcalls.
  width = handler_rep_.max_handlep1 ();

  // Now actually read the result needed by the <Select_Reactor> using
  // <select>.
  return ACE_OS::select(width,
                        wait_set.rd_mask_,
                        wait_set.wr_mask_,
                        wait_set.ex_mask_,
                        (ACE_Time_Value *) &ACE_Time_Value::zero);
}

int
ACE_QtReactor::register_handler_i (ACE_HANDLE handle ,
                                   ACE_Event_Handler *handler,
                                   ACE_Reactor_Mask mask)
{
  ACE_TRACE ("ACE_QtReactor::register_handler_i");

  int result;
  if ((result = ACE_Select_Reactor::register_handler_i(handle,
                                                       handler,
                                                       mask ))
      == -1)
    return -1;

  if (ACE_BIT_ENABLED(mask, ACE_Event_Handler::READ_MASK) ||
      ACE_BIT_ENABLED( mask, ACE_Event_Handler::ACCEPT_MASK))
    {
      // We check for any unused handles.
      MAP::ITERATOR read_iter = this->read_notifier_.end ();
      QSocketNotifier *qsock_read_notifier = 0;

      // We check whether we have a data against the present
      // handle. If so we need to unbind the data.
      if ((this->read_notifier_.find (handle,
                                      qsock_read_notifier) != -1))
        {
          if (qsock_read_notifier != (*read_iter).int_id_)
            {
              this->read_notifier_.unbind (handle,
                                           qsock_read_notifier);
              delete qsock_read_notifier;
            }
        }

      ACE_NEW_RETURN (qsock_read_notifier,
                      QSocketNotifier (int(handle), QSocketNotifier::Read),
                      -1);

      this->read_notifier_.bind (handle,
                                  qsock_read_notifier);

      QObject::connect (qsock_read_notifier,
                        SIGNAL (activated (int)),
                        this,
                        SLOT (read_event (int))) ;
    }

  if (ACE_BIT_ENABLED( mask, ACE_Event_Handler::WRITE_MASK) ||
      ACE_BIT_ENABLED( mask, ACE_Event_Handler::ACCEPT_MASK) ||
      ACE_BIT_ENABLED( mask, ACE_Event_Handler::CONNECT_MASK))
    {
      // We check for any unused handles.
      MAP::ITERATOR write_iter = this->write_notifier_.end ();
      QSocketNotifier *qsock_write_notifier = 0;

      // We check whether we have a data against the present
      // handle. If so we need to unbind the data.
      if ((this->write_notifier_.find (handle,
                                       qsock_write_notifier) != -1))
        {
          if (qsock_write_notifier != (*write_iter).int_id_)
            {
              this->write_notifier_.unbind (handle,
                                            qsock_write_notifier);
              delete qsock_write_notifier;
            }
        }

      ACE_NEW_RETURN (qsock_write_notifier,
                      QSocketNotifier (int(handle), QSocketNotifier::Write),
                      -1);

      this->write_notifier_.bind (handle,
                                   qsock_write_notifier);

      QObject::connect (qsock_write_notifier,
                        SIGNAL (activated (int)),
                        this,
                        SLOT (write_event (int)));
  }

  if (ACE_BIT_ENABLED( mask,
                       ACE_Event_Handler::EXCEPT_MASK))
  {
    // We check for any unused handles.
    MAP::ITERATOR excpt_iter = this->exception_notifier_.end ();
    QSocketNotifier *qsock_excpt_notifier = 0;

      // We check whether we have a data against the present
      // handle. If so we need to unbind the data.
      if ((this->exception_notifier_.find (handle,
                                           qsock_excpt_notifier) != -1))
        {
          if (qsock_excpt_notifier != (*excpt_iter).int_id_)
            {
              this->exception_notifier_.unbind (handle,
                                                qsock_excpt_notifier);
              delete qsock_excpt_notifier;
            }
        }

      ACE_NEW_RETURN (qsock_excpt_notifier,
                      QSocketNotifier (int(handle), QSocketNotifier::Exception),
                      -1);

      this->exception_notifier_.bind (handle,
                                       qsock_excpt_notifier);

      QObject::connect (qsock_excpt_notifier,
                        SIGNAL (activated (int)),
                        this,
                        SLOT (exception_event (int))) ;
  }

  return 0;
}

int
ACE_QtReactor::register_handler_i (const ACE_Handle_Set &handles,
                                   ACE_Event_Handler *handler,
                                   ACE_Reactor_Mask mask)
{
  return ACE_Select_Reactor::register_handler_i(handles,
                                                handler,
                                                mask);
}

int ACE_QtReactor::remove_handler_i (ACE_HANDLE handle ,
                                     ACE_Reactor_Mask mask   )
{
  ACE_TRACE ("ACE_QtReactor::remove_handler_i");

  QSocketNotifier *qsock_notifier = 0;

  // Looks for the handle in the maps and removes them.
  MAP::ITERATOR iter = this->read_notifier_.end ();

  if ((this->read_notifier_.find (handle,
                                  qsock_notifier) != -1))
    {
      this->read_notifier_.unbind (handle,
                                   qsock_notifier);
      delete qsock_notifier;
    }

  iter = this->write_notifier_.end ();
  if ((this->write_notifier_.find (handle,
                                   qsock_notifier) != -1))
    {
      this->write_notifier_.unbind (handle,
                                    qsock_notifier);
      delete qsock_notifier;
    }

  iter = this->exception_notifier_.end ();
  if ((this->exception_notifier_.find (handle,
                                       qsock_notifier) != -1))
    {
      this->exception_notifier_.unbind (handle,
                                        qsock_notifier);
      delete qsock_notifier;
    }

  // Now let the reactor do its work.
  return ACE_Select_Reactor::remove_handler_i (handle, mask);
}


int
ACE_QtReactor::remove_handler_i (const ACE_Handle_Set &handles,
                                 ACE_Reactor_Mask  mask)
{
  return ACE_Select_Reactor::remove_handler_i (handles,
                                               mask);
}

// The following functions ensure that there is an Qt timeout for the
// first timeout in the Reactor's Timer_Queue.

void
ACE_QtReactor::reset_timeout (void)
{
  if (this->qtime_ != 0)
    {
      delete this->qtime_;
      this->qtime_ = 0;
    }

  ACE_Time_Value *max_wait_time =
    this->timer_queue_->calculate_timeout (0) ;

  if (max_wait_time)
  {
    ACE_NEW (this->qtime_,
             QTimer);

    QObject::connect (qtime_,
                      SIGNAL (timeout ()),
                      this,
                      SLOT (timeout_event ()));

    qtime_->start(max_wait_time->msec(), 1);
  }

}


long
ACE_QtReactor::schedule_timer (ACE_Event_Handler *event_handler,
                               const void *arg,
                               const ACE_Time_Value &delay,
                               const ACE_Time_Value &interval)
{
  ACE_TRACE ("ACE_QtReactor::schedule_timer");
  ACE_MT (ACE_GUARD_RETURN (ACE_Select_Reactor_Token,
                            ace_mon,
                            this->token_,
                            -1));

  long result;
  if ((result = ACE_Select_Reactor::schedule_timer(event_handler,
                                                   arg,
                                                   delay,
                                                   interval)) == -1 )
    return -1;
  else
  {
    this->reset_timeout ();
    return result;
  }
}

int
ACE_QtReactor::cancel_timer (ACE_Event_Handler *handler,
                             int dont_call_handle_close)
{
  ACE_TRACE ("ACE_QtReactor::cancel_timer");

  if (ACE_Select_Reactor::cancel_timer (handler,
                                        dont_call_handle_close ) == -1 )
    return -1 ;
  else
  {
    this->reset_timeout( ) ;
    return 0 ;
  }
}

int ACE_QtReactor::cancel_timer (long  timer_id,
                                 const void **arg,
                                 int dont_call_handle_close )
{
  ACE_TRACE( "ACE_QtReactor::cancel_timer" ) ;

  if (ACE_Select_Reactor::cancel_timer (timer_id,
                                        arg,
                                        dont_call_handle_close ) == -1 )
    return -1 ;
  else
  {
    this->reset_timeout( ) ;
    return 0 ;
  }
}


#if defined (ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION)
template class ACE_Map_Entry<ACE_HANDLE, QSocketNotifier *>;
template class ACE_Map_Manager<ACE_HANDLE, QSocketNotifier *, ACE_Null_Mutex>;
template class ACE_Map_Iterator_Base<ACE_HANDLE, QSocketNotifier *, ACE_Null_Mutex>;
template class ACE_Map_Iterator<ACE_HANDLE, QSocketNotifier *, ACE_Null_Mutex>;
template class ACE_Map_Reverse_Iterator<ACE_HANDLE, QSocketNotifier *, ACE_Null_Mutex>;
#elif defined (ACE_HAS_TEMPLATE_INSTANTIATION_PRAGMA)
#pragma instantiate ACE_Map_Entry<ACE_HANDLE, QSocketNotifier *>
#pragma instantiate ACE_Map_Manager<ACE_HANDLE, QSocketNotifier *, ACE_Null_Mutex>
#pragma instantiate ACE_Map_Iterator_Base<ACE_HANDLE, QSocketNotifier *, ACE_Null_Mutex>
#pragma instantiate ACE_Map_Iterator<ACE_HANDLE, QSocketNotifier *, ACE_Null_Mutex>
#pragma instantiate ACE_Map_Reverse_Iterator<ACE_HANDLE, QSocketNotifier *, ACE_Null_Mutex>
#endif /* ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION */
#endif /*ACE_HAS_QT */

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