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/*************************************************************************
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: activitiesqueue.cxx,v $
*
* $Revision: 1.9 $
*
* last change: $Author: kz $ $Date: 2006-12-13 15:11:52 $
*
* The Contents of this file are made available subject to
* the terms of GNU Lesser General Public License Version 2.1.
*
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2005 by Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, CA 94303, USA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
************************************************************************/
// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_slideshow.hxx"
// must be first
#include <canvas/debug.hxx>
#include <canvas/verbosetrace.hxx>
#include <comphelper/scopeguard.hxx>
#include <comphelper/anytostring.hxx>
#include <cppuhelper/exc_hlp.hxx>
#include <slideshowexceptions.hxx>
#include <activity.hxx>
#include <activitiesqueue.hxx>
#include <boost/bind.hpp>
#include <boost/mem_fn.hpp>
#include <algorithm>
using namespace ::com::sun::star;
namespace slideshow
{
namespace internal
{
ActivitiesQueue::ActivitiesQueue( const ::boost::shared_ptr< ::canvas::tools::ElapsedTime >& pPresTimer,
EventMultiplexer& rEventMultiplexer ) :
mpTimer( pPresTimer ),
maCurrentActivitiesWaiting(),
maCurrentActivitiesReinsert(),
mrEventMultiplexer( rEventMultiplexer ),
mbCurrentRoundNeedsScreenUpdate( false )
{
}
ActivitiesQueue::~ActivitiesQueue()
{
// dispose all queue entries
try {
std::for_each( maCurrentActivitiesWaiting.begin(),
maCurrentActivitiesWaiting.end(),
boost::mem_fn( &Disposable::dispose ) );
std::for_each( maCurrentActivitiesReinsert.begin(),
maCurrentActivitiesReinsert.end(),
boost::mem_fn( &Disposable::dispose ) );
}
catch (uno::Exception &) {
OSL_ENSURE( false, rtl::OUStringToOString(
comphelper::anyToString(
cppu::getCaughtException() ),
RTL_TEXTENCODING_UTF8 ).getStr() );
}
}
bool ActivitiesQueue::addActivity( const ActivitySharedPtr& pActivity )
{
OSL_ENSURE( pActivity, "ActivitiesQueue::addActivity: activity ptr NULL" );
if( !pActivity )
return false;
// add entry to waiting list
maCurrentActivitiesWaiting.push_back( pActivity );
return true;
}
void ActivitiesQueue::process()
{
VERBOSE_TRACE( "ActivitiesQueue: outer loop heartbeat" );
// accumulate time lag for all activities, and lag time
// base if necessary:
ActivityQueue::const_iterator iPos(
maCurrentActivitiesWaiting.begin() );
const ActivityQueue::const_iterator iEnd(
maCurrentActivitiesWaiting.end() );
double fLag = 0.0;
for ( ; iPos != iEnd; ++iPos )
fLag = std::max<double>( fLag, (*iPos)->calcTimeLag() );
if (fLag > 0.0) {
mpTimer->adjustTimer( -fLag );
}
// This list collects all activities which did not request
// a reinsertion. After the screen update has been
// performed, those are notified via dequeued(). This
// facilitates cleanup actions taking place _after_ the
// current frame has been displayed.
ActivityQueue aDequeuedActivities;
// process list of activities
while( !maCurrentActivitiesWaiting.empty() )
{
// process topmost activity
ActivitySharedPtr pActivity( maCurrentActivitiesWaiting.front() );
maCurrentActivitiesWaiting.pop_front();
bool bReinsert( false );
try
{
// fire up activity
bReinsert = pActivity->perform();
}
catch( uno::Exception& )
{
// catch anything here, we don't want
// to leave this scope under _any_
// circumstance. Although, do _not_
// reinsert an activity that threw
// once.
// NOTE: we explicitely don't catch(...) here,
// since this will also capture segmentation
// violations and the like. In such a case, we
// still better let our clients now...
OSL_TRACE( "::presentation::internal::ActivitiesQueue: Activity threw a uno::Exception, removing from ring" );
}
catch( SlideShowException& )
{
// catch anything here, we don't want
// to leave this scope under _any_
// circumstance. Although, do _not_
// reinsert an activity that threw
// once.
// NOTE: we explicitely don't catch(...) here,
// since this will also capture segmentation
// violations and the like. In such a case, we
// still better let our clients now...
OSL_TRACE( "::presentation::internal::ActivitiesQueue: Activity threw a SlideShowException, removing from ring" );
}
// always query need for screen updates. Note that
// ending activities (i.e. those that return
// bReinsert=false) might also need one last screen
// update
if( pActivity->needsScreenUpdate() )
mbCurrentRoundNeedsScreenUpdate = true;
if( bReinsert )
maCurrentActivitiesReinsert.push_back( pActivity );
else
aDequeuedActivities.push_back( pActivity );
VERBOSE_TRACE( "ActivitiesQueue: inner loop heartbeat" );
}
// when true, the code below has determined that a screen
// update is necessary.
bool bPerformScreenUpdate( false );
// waiting activities exhausted? Then update screen, and
// reinsert
if( maCurrentActivitiesWaiting.empty() )
{
if( mbCurrentRoundNeedsScreenUpdate )
{
bPerformScreenUpdate = true;
}
// always clear update flag. There's no need to update
// yesterday's display, even if the canvas sometimes
// become valid
mbCurrentRoundNeedsScreenUpdate = false;
if( !maCurrentActivitiesReinsert.empty() )
{
// reinsert all processed, but not finished
// activities back to waiting queue. With swap(),
// we kill two birds with one stone: we reuse the
// list nodes, and we clear the
// maCurrentActivitiesReinsert list
maCurrentActivitiesWaiting.swap( maCurrentActivitiesReinsert );
}
}
// perform screen update (not only if one of the
// activities requested that, but also if the layer
// manager signals that it needs one. This frees us from
// introducing dummy activities, just to trigger screen
// updates. OTOH, this makes it necessary to always call
// BOTH event queue and activities queue, such that no
// pending update is unduly delayed)
mrEventMultiplexer.updateScreenContent( bPerformScreenUpdate );
// notify all dequeued activities, but only _after_ the
// screen update.
::std::for_each( aDequeuedActivities.begin(),
aDequeuedActivities.end(),
::boost::mem_fn( &Activity::dequeued ) );
}
bool ActivitiesQueue::isEmpty() const
{
return maCurrentActivitiesWaiting.empty() && maCurrentActivitiesReinsert.empty();
}
void ActivitiesQueue::clear()
{
// dequeue all entries:
std::for_each( maCurrentActivitiesWaiting.begin(),
maCurrentActivitiesWaiting.end(),
boost::mem_fn( &Activity::dequeued ) );
ActivityQueue().swap( maCurrentActivitiesWaiting );
std::for_each( maCurrentActivitiesReinsert.begin(),
maCurrentActivitiesReinsert.end(),
boost::mem_fn( &Activity::dequeued ) );
ActivityQueue().swap( maCurrentActivitiesReinsert );
mbCurrentRoundNeedsScreenUpdate = false;
}
}
}
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