/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 *   Licensed to the Apache Software Foundation (ASF) under one or more
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#ifndef INCLUDED_SD_SOURCE_UI_SLIDESORTER_CACHE_SLSQUEUEPROCESSOR_HXX
#define INCLUDED_SD_SOURCE_UI_SLIDESORTER_CACHE_SLSQUEUEPROCESSOR_HXX

#include <cache/SlsPageCache.hxx>
#include "SlsRequestPriorityClass.hxx"
#include "SlsBitmapFactory.hxx"
#include <view/SlideSorterView.hxx>
#include <tools/IdleDetection.hxx>
#include "SlsBitmapCache.hxx"
#include <sdpage.hxx>
#include <Window.hxx>

#include <svx/svdpagv.hxx>
#include <vcl/svapp.hxx>
#include <vcl/timer.hxx>

#include <functional>

namespace sd { namespace slidesorter { namespace view {
class SlideSorterView;
} } }

namespace sd { namespace slidesorter { namespace cache {

class BitmapCache;
class RequestQueue;

/** This queue processor is timer based, i.e. when an entry is added to the
    queue and the processor is started with Start() in the base class a
    timer is started that eventually calls ProcessRequest().  This is
    repeated until the queue is empty or Stop() is called.
*/
class QueueProcessor final
{
public:
    QueueProcessor (
        RequestQueue& rQueue,
        const std::shared_ptr<BitmapCache>& rpCache,
        const Size& rPreviewSize,
        const bool bDoSuperSampling,
        const SharedCacheContext& rpCacheContext);
    ~QueueProcessor();

    /** Start the processor.  This implementation is timer based and waits
        an defined amount of time that depends on the given argument before
        the next entry in the queue is processed.
        @param nPriorityClass
            A priority class of 0 tells the processor that a high priority
            request is waiting in the queue.  The time to wait is thus
            shorter then that for a low priority request (denoted by a value
            of 1.)  When the timer is already running it is not modified.
    */
    void Start (int nPriorityClass);
    void Stop();
    void Pause();
    void Resume();

    void SetPreviewSize (
        const Size& rSize,
        const bool bDoSuperSampling);

    /** Use this method when the page cache is (maybe) using a different
        BitmapCache.  This is usually necessary after calling
        PageCacheManager::ChangeSize().
    */
    void SetBitmapCache (const std::shared_ptr<BitmapCache>& rpCache);

private:
    /** This mutex is used to guard the queue processor.  Be careful not to
        mix its use with that of the solar mutex.
    */
    ::osl::Mutex maMutex;

    Timer  maTimer;
    DECL_LINK(ProcessRequestHdl, Timer *, void);
    Size maPreviewSize;
    bool mbDoSuperSampling;
    SharedCacheContext mpCacheContext;
    RequestQueue& mrQueue;
    std::shared_ptr<BitmapCache> mpCache;
    BitmapFactory maBitmapFactory;
    bool mbIsPaused;

    void ProcessRequests();
    void ProcessOneRequest (
        CacheKey aKey,
        const RequestPriorityClass ePriorityClass);
};

} } } // end of namespace ::sd::slidesorter::cache

#endif

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