4 * This file is part of LyX, the document processor.
5 * Licence details can be found in the file COPYING.
7 * \author Alfredo Braunstein
9 * Full author contact details are available in file CREDITS.
11 * This implements a threaded service queue which loads images on background.
12 * In order to request an image loading you call touch() with the pointer to
13 * the cached image. Then it will try to satisfy the request as soon as
14 * posible (that's it: after finishing an eventual loading on progress)
15 * touch() returns inmediately, in order not tu disrupt the flow of the main
17 * The service thread is the method loadNext(). It's actually not a thread,
18 * but implemented with a timer that comes back every x msec.
24 #include "GraphicsCache.h"
25 #include "GraphicsCacheItem.h"
27 #include "frontends/Timeout.h"
36 //use this to request a loading
37 void touch(Cache::ItemPtr const & item);
38 //query if the clock is ticking
40 //get the and only instance of the class
41 static LoaderQueue & get();
43 //this class is a singleton class... use LoaderQueue::get() instead
45 //in-progress loading queue (elements are unique here)
46 std::list<Cache::ItemPtr> cache_queue_;
47 //makes faster the insertion of new elements
48 std::set<Cache::ItemPtr> cache_set_;
49 //newly touched element go here, loadNext move them to cache_queue_
50 std::queue<Cache::ItemPtr> bucket_;
55 //moves bucket_ to cache_queue_
57 //adds or reprioritizes one element in cache_queue_
58 void addToQueue(Cache::ItemPtr const & item);
59 //this is the 'threaded' method, that does the loading in background
69 #endif // LOADERQUEUE_H