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// AFAutoPurgingImageCache.m
// Copyright (c) 2011–2016 Alamofire Software Foundation ( http://alamofire.org/ )
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#import <TargetConditionals.h>
#if TARGET_OS_IOS || TARGET_OS_TV
#import "AFAutoPurgingImageCache.h"
@interface AFCachedImage : NSObject
@property (nonatomic, strong) UIImage *image;
@property (nonatomic, copy) NSString *identifier;
@property (nonatomic, assign) UInt64 totalBytes;
@property (nonatomic, strong) NSDate *lastAccessDate;
@property (nonatomic, assign) UInt64 currentMemoryUsage;
@end
@implementation AFCachedImage
- (instancetype)initWithImage:(UIImage *)image identifier:(NSString *)identifier {
if (self = [self init]) {
self.image = image;
self.identifier = identifier;
CGSize imageSize = CGSizeMake(image.size.width * image.scale, image.size.height * image.scale);
CGFloat bytesPerPixel = 4.0;
CGFloat bytesPerSize = imageSize.width * imageSize.height;
self.totalBytes = (UInt64)bytesPerPixel * (UInt64)bytesPerSize;
self.lastAccessDate = [NSDate date];
}
return self;
}
- (UIImage *)accessImage {
self.lastAccessDate = [NSDate date];
return self.image;
}
- (NSString *)description {
NSString *descriptionString = [NSString stringWithFormat:@"Idenfitier: %@ lastAccessDate: %@ ", self.identifier, self.lastAccessDate];
return descriptionString;
}
@end
@interface AFAutoPurgingImageCache ()
@property (nonatomic, strong) NSMutableDictionary <NSString* , AFCachedImage*> *cachedImages;
@property (nonatomic, assign) UInt64 currentMemoryUsage;
@property (nonatomic, strong) dispatch_queue_t synchronizationQueue;
@end
@implementation AFAutoPurgingImageCache
- (instancetype)init {
return [self initWithMemoryCapacity:100 * 1024 * 1024 preferredMemoryCapacity:60 * 1024 * 1024];
}
- (instancetype)initWithMemoryCapacity:(UInt64)memoryCapacity preferredMemoryCapacity:(UInt64)preferredMemoryCapacity {
if (self = [super init]) {
self.memoryCapacity = memoryCapacity;
self.preferredMemoryUsageAfterPurge = preferredMemoryCapacity;
self.cachedImages = [[NSMutableDictionary alloc] init];
NSString *queueName = [NSString stringWithFormat:@"com.alamofire.autopurgingimagecache-%@", [[NSUUID UUID] UUIDString]];
self.synchronizationQueue = dispatch_queue_create([queueName cStringUsingEncoding:NSASCIIStringEncoding], DISPATCH_QUEUE_CONCURRENT);
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:@selector(removeAllImages)
name:UIApplicationDidReceiveMemoryWarningNotification
object:nil];
}
return self;
}
- (void)dealloc {
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
- (UInt64)memoryUsage {
__block UInt64 result = 0;
dispatch_sync(self.synchronizationQueue, ^{
result = self.currentMemoryUsage;
});
return result;
}
- (void)addImage:(UIImage *)image withIdentifier:(NSString *)identifier {
dispatch_barrier_async(self.synchronizationQueue, ^{
AFCachedImage *cacheImage = [[AFCachedImage alloc] initWithImage:image identifier:identifier];
AFCachedImage *previousCachedImage = self.cachedImages[identifier];
if (previousCachedImage != nil) {
self.currentMemoryUsage -= previousCachedImage.totalBytes;
}
self.cachedImages[identifier] = cacheImage;
self.currentMemoryUsage += cacheImage.totalBytes;
});
dispatch_barrier_async(self.synchronizationQueue, ^{
if (self.currentMemoryUsage > self.memoryCapacity) {
UInt64 bytesToPurge = self.currentMemoryUsage - self.preferredMemoryUsageAfterPurge;
NSMutableArray <AFCachedImage*> *sortedImages = [NSMutableArray arrayWithArray:self.cachedImages.allValues];
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"lastAccessDate"
ascending:YES];
[sortedImages sortUsingDescriptors:@[sortDescriptor]];
UInt64 bytesPurged = 0;
for (AFCachedImage *cachedImage in sortedImages) {
[self.cachedImages removeObjectForKey:cachedImage.identifier];
bytesPurged += cachedImage.totalBytes;
if (bytesPurged >= bytesToPurge) {
break;
}
}
self.currentMemoryUsage -= bytesPurged;
}
});
}
- (BOOL)removeImageWithIdentifier:(NSString *)identifier {
__block BOOL removed = NO;
dispatch_barrier_sync(self.synchronizationQueue, ^{
AFCachedImage *cachedImage = self.cachedImages[identifier];
if (cachedImage != nil) {
[self.cachedImages removeObjectForKey:identifier];
self.currentMemoryUsage -= cachedImage.totalBytes;
removed = YES;
}
});
return removed;
}
- (BOOL)removeAllImages {
__block BOOL removed = NO;
dispatch_barrier_sync(self.synchronizationQueue, ^{
if (self.cachedImages.count > 0) {
[self.cachedImages removeAllObjects];
self.currentMemoryUsage = 0;
removed = YES;
}
});
return removed;
}
- (nullable UIImage *)imageWithIdentifier:(NSString *)identifier {
__block UIImage *image = nil;
dispatch_sync(self.synchronizationQueue, ^{
AFCachedImage *cachedImage = self.cachedImages[identifier];
image = [cachedImage accessImage];
});
return image;
}
- (void)addImage:(UIImage *)image forRequest:(NSURLRequest *)request withAdditionalIdentifier:(NSString *)identifier {
[self addImage:image withIdentifier:[self imageCacheKeyFromURLRequest:request withAdditionalIdentifier:identifier]];
}
- (BOOL)removeImageforRequest:(NSURLRequest *)request withAdditionalIdentifier:(NSString *)identifier {
return [self removeImageWithIdentifier:[self imageCacheKeyFromURLRequest:request withAdditionalIdentifier:identifier]];
}
- (nullable UIImage *)imageforRequest:(NSURLRequest *)request withAdditionalIdentifier:(NSString *)identifier {
return [self imageWithIdentifier:[self imageCacheKeyFromURLRequest:request withAdditionalIdentifier:identifier]];
}
- (NSString *)imageCacheKeyFromURLRequest:(NSURLRequest *)request withAdditionalIdentifier:(NSString *)additionalIdentifier {
NSString *key = request.URL.absoluteString;
if (additionalIdentifier != nil) {
key = [key stringByAppendingString:additionalIdentifier];
}
return key;
}
- (BOOL)shouldCacheImage:(UIImage *)image forRequest:(NSURLRequest *)request withAdditionalIdentifier:(nullable NSString *)identifier {
return YES;
}
@end
#endif
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