113 lines
3.0 KiB
Mathematica
113 lines
3.0 KiB
Mathematica
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/*
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* This file is part of the SDWebImage package.
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* (c) Olivier Poitrey <rs@dailymotion.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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#import "SDWebImagePrefetcher.h"
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#import "SDWebImageManager.h"
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@interface SDWebImagePrefetcher ()
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@property (nonatomic, retain) NSArray *prefetchURLs;
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@end
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@implementation SDWebImagePrefetcher
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static SDWebImagePrefetcher *instance;
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@synthesize prefetchURLs;
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@synthesize maxConcurrentDownloads;
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+ (SDWebImagePrefetcher *)sharedImagePrefetcher
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{
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if (instance == nil)
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{
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instance = [[SDWebImagePrefetcher alloc] init];
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instance.maxConcurrentDownloads = 3;
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}
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return instance;
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}
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- (void)startPrefetchingAtIndex:(NSUInteger)index withManager:(SDWebImageManager *)imageManager
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{
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if (index >= [self.prefetchURLs count]) return;
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_requestedCount++;
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[imageManager downloadWithURL:[self.prefetchURLs objectAtIndex:index] delegate:self options:SDWebImageLowPriority];
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}
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- (void)reportStatus
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{
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NSUInteger total = [self.prefetchURLs count];
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NSLog(@"Finished prefetching (%d successful, %d skipped, timeElasped %.2f)", total - _skippedCount, _skippedCount, CFAbsoluteTimeGetCurrent() - _startedTime);
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}
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- (void)prefetchURLs:(NSArray *)urls
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{
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[self cancelPrefetching]; // Prevent duplicate prefetch request
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_startedTime = CFAbsoluteTimeGetCurrent();
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self.prefetchURLs = urls;
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// Starts prefetching from the very first image on the list with the max allowed concurrency
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int listCount = [self.prefetchURLs count];
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SDWebImageManager *manager = [SDWebImageManager sharedManager];
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for (int i = 0; i < self.maxConcurrentDownloads && _requestedCount < listCount; i++)
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{
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[self startPrefetchingAtIndex:i withManager:manager];
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}
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}
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- (void)cancelPrefetching
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{
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self.prefetchURLs = nil;
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_skippedCount = 0;
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_requestedCount = 0;
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_finishedCount = 0;
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[[SDWebImageManager sharedManager] cancelForDelegate:self];
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}
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#pragma mark SDWebImagePrefetcher (SDWebImageManagerDelegate)
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- (void)webImageManager:(SDWebImageManager *)imageManager didFinishWithImage:(UIImage *)image
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{
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_finishedCount++;
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NSLog(@"Prefetched %d out of %d", _finishedCount, [self.prefetchURLs count]);
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if ([self.prefetchURLs count] > _requestedCount)
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{
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[self startPrefetchingAtIndex:_requestedCount withManager:imageManager];
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}
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else if (_finishedCount == _requestedCount)
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{
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[self reportStatus];
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}
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}
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- (void)webImageManager:(SDWebImageManager *)imageManager didFailWithError:(NSError *)error
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{
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_finishedCount++;
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NSLog(@"Prefetched %d out of %d (Failed)", _finishedCount, [self.prefetchURLs count]);
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// Add last failed
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_skippedCount++;
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if ([self.prefetchURLs count] > _requestedCount)
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{
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[self startPrefetchingAtIndex:_requestedCount withManager:imageManager];
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}
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else if (_finishedCount == _requestedCount)
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{
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[self reportStatus];
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}
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}
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- (void)dealloc
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{
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self.prefetchURLs = nil;
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[super dealloc];
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}
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@end
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