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Diffstat (limited to 'sd/source/ui/slidesorter/cache/SlsRequestQueue.cxx')
-rw-r--r-- | sd/source/ui/slidesorter/cache/SlsRequestQueue.cxx | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/sd/source/ui/slidesorter/cache/SlsRequestQueue.cxx b/sd/source/ui/slidesorter/cache/SlsRequestQueue.cxx new file mode 100644 index 000000000..931c1a8f6 --- /dev/null +++ b/sd/source/ui/slidesorter/cache/SlsRequestQueue.cxx @@ -0,0 +1,275 @@ +/* -*- 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 "SlsRequestQueue.hxx" + +#include <sal/log.hxx> + +#include <svx/svdpage.hxx> + +#include <set> + +namespace sd::slidesorter::cache { + +namespace { + +/** This class extends the actual request data with additional information + that is used by the priority queues. +*/ +class Request +{ +public: + Request ( + CacheKey aKey, sal_Int32 nPriority, RequestPriorityClass eClass) + : maKey(aKey), mnPriorityInClass(nPriority), meClass(eClass) + {} + /** Sort requests according to priority classes and then to priorities. + */ + class Comparator { public: + bool operator() (const Request& rRequest1, const Request& rRequest2) + const + { + if (rRequest1.meClass == rRequest2.meClass) + { + if (rRequest1.mnPriorityInClass == rRequest2.mnPriorityInClass) + { + return rRequest1.maKey < rRequest2.maKey; + } + return rRequest1.mnPriorityInClass > rRequest2.mnPriorityInClass; + } + return rRequest1.meClass < rRequest2.meClass; + } + }; + /** Request data is compared arbitrarily by their addresses in memory. + This just establishes an order so that the STL containers are happy. + The order is not semantically interpreted. + */ + class DataComparator + { + public: + explicit DataComparator (const CacheKey aKey) + : maKey(aKey) + { + } + bool operator() (const Request& rRequest) const + { + return maKey == rRequest.maKey; + } + private: + const CacheKey maKey; + }; + + CacheKey maKey; + sal_Int32 mnPriorityInClass; + RequestPriorityClass meClass; +}; + +} + +class RequestQueue::Container + : public ::std::set< + Request, + Request::Comparator> +{ +}; + +//===== GenericRequestQueue ================================================= + +RequestQueue::RequestQueue (const SharedCacheContext& rpCacheContext) + : mpRequestQueue(new Container), + mpCacheContext(rpCacheContext), + mnMinimumPriority(0), + mnMaximumPriority(1) +{ +} + +RequestQueue::~RequestQueue() +{ + Clear(); +} + +void RequestQueue::AddRequest ( + CacheKey aKey, + RequestPriorityClass eRequestClass) +{ + ::osl::MutexGuard aGuard (maMutex); + + assert(eRequestClass>=MIN_CLASS && eRequestClass<=MAX_CLASS); + + // If the request is already a member of the queue then remove it so + // that the following insertion will use the new prioritization. +#if OSL_DEBUG_LEVEL >=2 + bool bRemoved = +#endif + RemoveRequest(aKey); + + // The priority of the request inside its priority class is defined by + // the page number. This ensures a strict top-to-bottom, left-to-right + // order. + sal_Int32 nPriority (mpCacheContext->GetPriority(aKey)); + Request aRequest (aKey, nPriority, eRequestClass); + + std::pair<Container::iterator,bool> ret = mpRequestQueue->insert(aRequest); + bool bInserted = ret.second; + + if (bInserted) + { + SdrPage *pPage = const_cast<SdrPage*>(aRequest.maKey); + pPage->AddPageUser(*this); + } + +#if OSL_DEBUG_LEVEL >=2 + SAL_INFO("sd.sls", __func__ << ": " << (bRemoved?"replaced":"added") + << " request for page " << ((aKey->GetPageNum()-1)/2) + << " with priority class " << static_cast<int>(eRequestClass)); +#endif +} + +void RequestQueue::PageInDestruction(const SdrPage& rPage) +{ + //remove any requests pending for this page which is going away now + RemoveRequest(&rPage); +} + +#if OSL_DEBUG_LEVEL >=2 +bool +#else +void +#endif +RequestQueue::RemoveRequest( + CacheKey aKey) +{ + ::osl::MutexGuard aGuard (maMutex); +#if OSL_DEBUG_LEVEL >=2 + bool bIsRemoved = false; +#endif + while(true) + { + Container::const_iterator aRequestIterator = ::std::find_if ( + mpRequestQueue->begin(), + mpRequestQueue->end(), + Request::DataComparator(aKey)); + if (aRequestIterator != mpRequestQueue->end()) + { + if (aRequestIterator->mnPriorityInClass == mnMinimumPriority+1) + mnMinimumPriority++; + else if (aRequestIterator->mnPriorityInClass == mnMaximumPriority-1) + mnMaximumPriority--; + + SdrPage *pPage = const_cast<SdrPage*>(aRequestIterator->maKey); + pPage->RemovePageUser(*this); + mpRequestQueue->erase(aRequestIterator); +#if OSL_DEBUG_LEVEL >=2 + bIsRemoved = true; +#endif + } + else + break; + } +#if OSL_DEBUG_LEVEL >=2 + return bIsRemoved; +#endif + +} + +void RequestQueue::ChangeClass ( + CacheKey aKey, + RequestPriorityClass eNewRequestClass) +{ + ::osl::MutexGuard aGuard (maMutex); + + assert(eNewRequestClass>=MIN_CLASS && eNewRequestClass<=MAX_CLASS); + + Container::const_iterator iRequest ( + ::std::find_if ( + mpRequestQueue->begin(), + mpRequestQueue->end(), + Request::DataComparator(aKey))); + if (iRequest!=mpRequestQueue->end() && iRequest->meClass!=eNewRequestClass) + { + AddRequest(aKey, eNewRequestClass); + } +} + +CacheKey RequestQueue::GetFront() +{ + ::osl::MutexGuard aGuard (maMutex); + + if (mpRequestQueue->empty()) + throw css::uno::RuntimeException("RequestQueue::GetFront(): queue is empty", + nullptr); + + return mpRequestQueue->begin()->maKey; +} + +RequestPriorityClass RequestQueue::GetFrontPriorityClass() +{ + ::osl::MutexGuard aGuard (maMutex); + + if (mpRequestQueue->empty()) + throw css::uno::RuntimeException("RequestQueue::GetFrontPriorityClass(): queue is empty", + nullptr); + + return mpRequestQueue->begin()->meClass; +} + +void RequestQueue::PopFront() +{ + ::osl::MutexGuard aGuard (maMutex); + + if ( mpRequestQueue->empty()) + return; + + Container::const_iterator aIter(mpRequestQueue->begin()); + SdrPage *pPage = const_cast<SdrPage*>(aIter->maKey); + pPage->RemovePageUser(*this); + mpRequestQueue->erase(aIter); + + // Reset the priority counter if possible. + if (mpRequestQueue->empty()) + { + mnMinimumPriority = 0; + mnMaximumPriority = 1; + } +} + +bool RequestQueue::IsEmpty() +{ + ::osl::MutexGuard aGuard (maMutex); + return mpRequestQueue->empty(); +} + +void RequestQueue::Clear() +{ + ::osl::MutexGuard aGuard (maMutex); + + for (const auto& rItem : *mpRequestQueue) + { + SdrPage *pPage = const_cast<SdrPage*>(rItem.maKey); + pPage->RemovePageUser(*this); + } + + mpRequestQueue->clear(); + mnMinimumPriority = 0; + mnMaximumPriority = 1; +} + +} // end of namespace ::sd::slidesorter::cache + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |