public void changeWorkingSet(WorkingSet<String> newSet) {
// cancel any pending jobs so that we don't waste time loading images no longer needed
loaderPool.clearJobs();
if (DEBUG) {
System.out.println("RamTextureCache: changeWorkingSet:");
for (String imageId : newSet.getPrioritizedList())
System.out.printf("\t%s (pri %d)\n", imageId, newSet.getPriority(imageId));
}
synchronized (cache) // because of race with imageLoaded()
{
// adjust priorities of already cached items.
// (No longer needed items get super low priority)
cache.updatePriority(newSet);
// switch working sets
curSet = newSet;
// Start loading those which we are missing
for (String imageId : newSet.getPrioritizedList()) {
if (!cache.contains(imageId)) {
if (DEBUG) System.out.printf("RamTextureCache: not cached: %s\n", imageId);
loaderPool.addJob(imageId);
}
}
}
}
public boolean shouldLoad(String filePath, int estimatedImageSize) {
synchronized (cache) // because of race with changeWorkingSet() and getGLImage
{
// if somebody is waiting for it we have no choice
if (urgentImageIds.contains(filePath) && curSet.contains(filePath)) return true;
else {
int priority = curSet.getPriority(filePath);
// lower priority by one - ImageLoaderPool should not bother loading an image
// if it's just going to replace one of equal priority - there's no point
if (priority > Integer.MIN_VALUE) priority--;
return cache.canStore(estimatedImageSize, priority);
}
}
}
public void shutdown() {
synchronized (cache) {
cache.clear();
curSet.clear();
urgentImageIds.clear();
// wake any sleeping threads
cache.notifyAll();
}
loaderPool.shutdown();
}
/**
* Get the GLImage associated with the specified image-id. If the image is cached in memory this
* call will be very fast, otherwise it will be loaded from disk and saved to cache.
*
* @return null if the specified image is not in the current working set
*/
public GLImage getGLImage(String imageId) {
synchronized (cache) {
GLImage img = cache.get(imageId);
if (img == null && curSet.contains(imageId)) {
// elevate the urgency of this image
if (DEBUG) System.out.printf("RamTextureCache: requesting immediate load of %s\n", imageId);
urgentImageIds.add(imageId);
loaderPool.makeTopPriority(imageId);
long startTime = System.currentTimeMillis();
// wait for image to arrive
while (curSet.contains(imageId) && !cache.contains(imageId)) {
try {
cache.wait(10000);
img = cache.get(imageId);
// timed out?
if (img == null && (System.currentTimeMillis() - startTime) >= 10000) {
System.err.println("RamTextureCache: timed out waiting for " + imageId);
break;
}
} catch (InterruptedException e) {
// ignore
}
}
urgentImageIds.remove(imageId);
// use fallback image
if (img == null) img = GLImage.createNullImage();
} else if (DEBUG && img == null)
System.out.printf("RamTextureCache: %s not in working set\n", imageId);
return img;
}
}
public void imageLoaded(String filePath, GLImage image) {
synchronized (cache) // because of race with changeWorkingSet() and getGLImage
{
int priority = curSet.getPriority(filePath);
boolean isInCurSet = priority > Integer.MIN_VALUE;
if (DEBUG) System.out.printf("RamTextureCache: loaded %s (pri=%d)\n", filePath, priority);
// Store the loaded image in cache
boolean full = !cache.store(filePath, image, image.nBytes, priority);
// Stop loading images if the cache is full.
// Second condition is important in case image was from previous
// working set - we don't want to abort loading the new set
if (full && isInCurSet) {
if (DEBUG) System.out.println("RamTextureCache: cache is full, stop loading");
loaderPool.clearJobs();
}
// wake up threads inside getGLImage()
cache.notifyAll();
}
}