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| -rw-r--r-- | slideshow/source/engine/activitiesqueue.cxx | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/slideshow/source/engine/activitiesqueue.cxx b/slideshow/source/engine/activitiesqueue.cxx new file mode 100644 index 000000000..ba9823853 --- /dev/null +++ b/slideshow/source/engine/activitiesqueue.cxx @@ -0,0 +1,181 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + + +#include <tools/diagnose_ex.h> +#include <osl/diagnose.h> +#include <sal/log.hxx> + +#include <slideshowexceptions.hxx> +#include <activity.hxx> +#include <activitiesqueue.hxx> + +#include <algorithm> +#include <memory> + + +using namespace ::com::sun::star; + +namespace slideshow::internal +{ + ActivitiesQueue::ActivitiesQueue( + const std::shared_ptr< ::canvas::tools::ElapsedTime >& pPresTimer ) : + mpTimer( pPresTimer ), + maCurrentActivitiesWaiting(), + maCurrentActivitiesReinsert(), + maDequeuedActivities() + { + } + + ActivitiesQueue::~ActivitiesQueue() + { + // dispose all queue entries + try + { + for( const auto& pActivity : maCurrentActivitiesWaiting ) + pActivity->dispose(); + for( const auto& pActivity : maCurrentActivitiesReinsert ) + pActivity->dispose(); + } + catch (const uno::Exception&) + { + TOOLS_WARN_EXCEPTION("slideshow", ""); + } + } + + 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() + { + SAL_INFO("slideshow.verbose", "ActivitiesQueue: outer loop heartbeat" ); + + // accumulate time lag for all activities, and lag time + // base if necessary: + double fLag = 0.0; + for ( const auto& rxActivity : maCurrentActivitiesWaiting ) + fLag = std::max<double>( fLag, rxActivity->calcTimeLag() ); + if (fLag > 0.0) + { + mpTimer->adjustTimer( -fLag ); + } + + // 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::RuntimeException& ) + { + throw; + } + 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 explicitly 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... + TOOLS_WARN_EXCEPTION( "slideshow", "" ); + } + 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 explicitly 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... + SAL_WARN("slideshow", "::presentation::internal::ActivitiesQueue: Activity threw a SlideShowException, removing from ring" ); + } + + if( bReinsert ) + maCurrentActivitiesReinsert.push_back( pActivity ); + else + maDequeuedActivities.push_back( pActivity ); + + SAL_INFO("slideshow.verbose", "ActivitiesQueue: inner loop heartbeat" ); + } + + 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 ); + } + } + + void ActivitiesQueue::processDequeued() + { + // notify all dequeued activities from last round + for( const auto& pActivity : maDequeuedActivities ) + pActivity->dequeued(); + maDequeuedActivities.clear(); + } + + bool ActivitiesQueue::isEmpty() const + { + return maCurrentActivitiesWaiting.empty() && maCurrentActivitiesReinsert.empty(); + } + + void ActivitiesQueue::clear() + { + // dequeue all entries: + for( const auto& pActivity : maCurrentActivitiesWaiting ) + pActivity->dequeued(); + ActivityQueue().swap( maCurrentActivitiesWaiting ); + + for( const auto& pActivity : maCurrentActivitiesReinsert ) + pActivity->dequeued(); + ActivityQueue().swap( maCurrentActivitiesReinsert ); + } +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |