// Return True if the cached file is usable
bool GLC_CacheManager::isUsable(const QDateTime& timeStamp, const QString& context, const QString& fileName) const
{
bool result= isCashed(context, fileName);
if (result)
{
QFileInfo cacheFileInfo(m_Dir.absolutePath() + QDir::separator() + context + QDir::separator() + fileName+ '.' + GLC_BSRep::suffix());
//result= result && (timeStamp == cacheFileInfo.lastModified());
result= result && cacheFileInfo.isReadable();
if (result)
{
GLC_BSRep binaryRep;
binaryRep.setAbsoluteFileName(cacheFileInfo.absoluteFilePath());
result= result && binaryRep.isUsable(timeStamp);
}
}
return result;
}
MythImage *MythUIHelper::LoadCacheImage(QString srcfile, QString label,
MythPainter *painter,
ImageCacheMode cacheMode)
{
LOG(VB_GUI | VB_FILE, LOG_INFO, LOC +
QString("LoadCacheImage(%1,%2)").arg(srcfile).arg(label));
if (srcfile.isEmpty() || label.isEmpty())
return NULL;
if (!(kCacheForceStat & cacheMode))
{
// Some screens include certain images dozens or even hundreds of
// times. Even if the image is in the cache, there is still a
// stat system call on the original file to see if it has changed.
// This code relaxes the original-file check so that the check
// isn't repeated if it was already done within kImageCacheTimeout
// seconds.
// This only applies to the MEMORY cache
const uint kImageCacheTimeout = 60;
uint now = MythDate::current().toTime_t();
QMutexLocker locker(d->m_cacheLock);
if (d->imageCache.contains(label) &&
d->CacheTrack[label] + kImageCacheTimeout > now)
{
d->imageCache[label]->IncrRef();
return d->imageCache[label];
}
}
MythImage *ret = NULL;
// Check Memory Cache
ret = GetImageFromCache(label);
// If the image is in the memory or we are not ignoring the disk cache
// then proceed to check whether the source file is newer than our cached
// copy
if (ret || !(cacheMode & kCacheIgnoreDisk))
{
// Create url to image in disk cache
QString cachefilepath = GetThemeCacheDir() + '/' + label;
QFileInfo cacheFileInfo(cachefilepath);
// If the file isn't in the disk cache, then we don't want to bother
// checking the last modified times of the original
if (!cacheFileInfo.exists())
return NULL;
// Now compare the time on the source versus our cached copy
QDateTime srcLastModified;
// For internet images this involves querying the headers of the remote
// image. This is slow even without redownloading the whole image
if ((srcfile.startsWith("http://")) ||
(srcfile.startsWith("https://")) ||
(srcfile.startsWith("ftp://")))
{
// If the image is in the memory cache then skip the last modified
// check, since memory cached images are loaded in the foreground
// this can cause an intolerable delay. The images won't stay in
// the cache forever and so eventually they will be checked.
if (ret)
srcLastModified = cacheFileInfo.lastModified();
else
{
srcLastModified =
GetMythDownloadManager()->GetLastModified(srcfile);
}
}
else if (srcfile.startsWith("myth://"))
srcLastModified = RemoteFile::LastModified(srcfile);
else
{
if (!FindThemeFile(srcfile))
return NULL;
QFileInfo original(srcfile);
if (original.exists())
srcLastModified = original.lastModified();
}
// Now compare the timestamps, if the cached image is newer than the
// source image we can use it, otherwise we want to remove it from the
// cache
if (cacheFileInfo.lastModified() >= srcLastModified)
{
// If we haven't already loaded the image from the memory cache
// and we're not ignoring the disk cache, then it's time to load
// it from there instead
if (!ret && (cacheMode == kCacheNormal))
{
if (painter)
ret = painter->GetFormatImage();
// Load file from disk cache to memory cache
if (ret->Load(cachefilepath))
{
// Add to ram cache, and skip saving to disk since that is
// where we found this in the first place.
CacheImage(label, ret, true);
}
else
{
LOG(VB_GUI | VB_FILE, LOG_WARNING, LOC +
QString("LoadCacheImage: Could not load :%1")
.arg(cachefilepath));
ret->SetIsInCache(false);
ret->DecrRef();
ret = NULL;
}
}
}
else
{
ret = NULL;
// If file has changed on disk, then remove it from the memory
// and disk cache
RemoveFromCacheByURL(label);
}
}
return ret;
}
