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Performance: Opt when multiple same URL query in parallels, which may cause duplicated decode and store disk operation

This commit is contained in:
DreamPiggy 2023-04-25 18:25:05 +08:00
parent 20df851f2a
commit 71bcdf006a
1 changed files with 10 additions and 4 deletions
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14
SDWebImage/Core/SDImageCache.m
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@ -668,11 +668,17 @@ static NSString * _defaultDiskCacheDirectory;
// Query full size cache key which generate a thumbnail, should not write back to full size memory cache
shouldCacheToMomery = NO;
}
// Special case: If user query image in list for the same URL, to avoid decode and write **same** image object into disk cache multiple times, we query and check memory cache here again.
if (shouldCacheToMomery && self.config.shouldCacheImagesInMemory) {
diskImage = [self.memoryCache objectForKey:key];
}
// decode image data only if in-memory cache missed
diskImage = [self diskImageForKey:key data:diskData options:options context:context];
if (shouldCacheToMomery && diskImage && self.config.shouldCacheImagesInMemory) {
NSUInteger cost = diskImage.sd_memoryCost;
[self.memoryCache setObject:diskImage forKey:key cost:cost];
if (!diskImage) {
diskImage = [self diskImageForKey:key data:diskData options:options context:context];
if (shouldCacheToMomery && diskImage && self.config.shouldCacheImagesInMemory) {
NSUInteger cost = diskImage.sd_memoryCost;
[self.memoryCache setObject:diskImage forKey:key cost:cost];
}
}
}
return diskImage;