SDImageLoadersManager.m
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/*
* This file is part of the SDWebImage package.
* (c) Olivier Poitrey <rs@dailymotion.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
#import "SDImageLoadersManager.h"
#import "SDWebImageDownloader.h"
@interface SDImageLoadersManager ()
@property (nonatomic, strong, nonnull) dispatch_semaphore_t loadersLock;
@end
@implementation SDImageLoadersManager
+ (SDImageLoadersManager *)sharedManager {
static dispatch_once_t onceToken;
static SDImageLoadersManager *manager;
dispatch_once(&onceToken, ^{
manager = [[SDImageLoadersManager alloc] init];
});
return manager;
}
- (instancetype)init {
self = [super init];
if (self) {
// initialize with default image loaders
self.loaders = @[[SDWebImageDownloader sharedDownloader]];
self.loadersLock = dispatch_semaphore_create(1);
}
return self;
}
#pragma mark - Loader Property
- (void)addLoader:(id<SDImageLoader>)loader {
if (![loader conformsToProtocol:@protocol(SDImageLoader)]) {
return;
}
LOCK(self.loadersLock);
NSMutableArray<id<SDImageLoader>> *mutableLoaders = [self.loaders mutableCopy];
if (!mutableLoaders) {
mutableLoaders = [NSMutableArray array];
}
[mutableLoaders addObject:loader];
self.loaders = [mutableLoaders copy];
UNLOCK(self.loadersLock);
}
- (void)removeLoader:(id<SDImageLoader>)loader {
if (![loader conformsToProtocol:@protocol(SDImageLoader)]) {
return;
}
LOCK(self.loadersLock);
NSMutableArray<id<SDImageLoader>> *mutableLoaders = [self.loaders mutableCopy];
[mutableLoaders removeObject:loader];
self.loaders = [mutableLoaders copy];
UNLOCK(self.loadersLock);
}
#pragma mark - SDImageLoader
- (BOOL)canLoadWithURL:(nullable NSURL *)url {
LOCK(self.loadersLock);
NSArray<id<SDImageLoader>> *loaders = self.loaders;
UNLOCK(self.loadersLock);
for (id<SDImageLoader> loader in loaders.reverseObjectEnumerator) {
if ([loader canLoadWithURL:url]) {
return YES;
}
}
return NO;
}
- (id<SDWebImageOperation>)loadImageWithURL:(NSURL *)url options:(SDWebImageOptions)options context:(SDWebImageContext *)context progress:(SDImageLoaderProgressBlock)progressBlock completed:(SDImageLoaderCompletedBlock)completedBlock {
if (!url) {
return nil;
}
LOCK(self.loadersLock);
NSArray<id<SDImageLoader>> *loaders = self.loaders;
UNLOCK(self.loadersLock);
for (id<SDImageLoader> loader in loaders.reverseObjectEnumerator) {
if ([loader canLoadWithURL:url]) {
return [loader loadImageWithURL:url options:options context:context progress:progressBlock completed:completedBlock];
}
}
return nil;
}
@end