fix redundant url requests
This commit is contained in:
马遥
parent
8dbf8ed97a
commit
39af2be6ee
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@ -21,22 +21,6 @@ NSNotificationName const SDWebImageDownloadStopNotification = @"SDWebImageDownlo
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NSNotificationName const SDWebImageDownloadFinishNotification = @"SDWebImageDownloadFinishNotification";
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static void * SDWebImageDownloaderContext = &SDWebImageDownloaderContext;
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static void * SDWebImageDownloaderOperationKey = &SDWebImageDownloaderOperationKey;
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BOOL SDWebImageDownloaderOperationGetCompleted(id<SDWebImageDownloaderOperation> operation) {
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NSCParameterAssert(operation);
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NSNumber *value = objc_getAssociatedObject(operation, SDWebImageDownloaderOperationKey);
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if (value != nil) {
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return value.boolValue;
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} else {
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return NO;
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}
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}
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void SDWebImageDownloaderOperationSetCompleted(id<SDWebImageDownloaderOperation> operation, BOOL isCompleted) {
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NSCParameterAssert(operation);
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objc_setAssociatedObject(operation, SDWebImageDownloaderOperationKey, @(isCompleted), OBJC_ASSOCIATION_RETAIN);
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}
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@interface SDWebImageDownloadToken ()
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@ -239,7 +223,7 @@ void SDWebImageDownloaderOperationSetCompleted(id<SDWebImageDownloaderOperation>
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BOOL shouldNotReuseOperation;
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if (operation) {
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@synchronized (operation) {
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shouldNotReuseOperation = operation.isFinished || operation.isCancelled || SDWebImageDownloaderOperationGetCompleted(operation);
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shouldNotReuseOperation = operation.isFinished || operation.isCancelled;
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}
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} else {
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shouldNotReuseOperation = YES;
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@ -518,12 +502,6 @@ didReceiveResponse:(NSURLResponse *)response
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// Identify the operation that runs this task and pass it the delegate method
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NSOperation<SDWebImageDownloaderOperation> *dataOperation = [self operationWithTask:task];
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if (dataOperation) {
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@synchronized (dataOperation) {
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// Mark the downloader operation `isCompleted = YES`, no longer re-use this operation when new request comes in
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SDWebImageDownloaderOperationSetCompleted(dataOperation, YES);
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}
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}
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if ([dataOperation respondsToSelector:@selector(URLSession:task:didCompleteWithError:)]) {
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[dataOperation URLSession:session task:task didCompleteWithError:error];
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}
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@ -14,8 +14,6 @@
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#import "SDImageCacheDefine.h"
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#import "SDCallbackQueue.h"
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BOOL SDWebImageDownloaderOperationGetCompleted(id<SDWebImageDownloaderOperation> operation); // Private currently, mark open if needed
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// A handler to represent individual request
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@interface SDWebImageDownloaderOperationToken : NSObject
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@ -62,6 +60,8 @@ BOOL SDWebImageDownloaderOperationGetCompleted(id<SDWebImageDownloaderOperation>
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@property (strong, nonatomic, nullable) NSError *responseError;
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@property (assign, nonatomic) double previousProgress; // previous progress percent
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@property (assign, nonatomic, getter = isDownloadCompleted) BOOL downloadCompleted;
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@property (strong, nonatomic, nullable) id<SDWebImageDownloaderResponseModifier> responseModifier; // modify original URLResponse
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@property (strong, nonatomic, nullable) id<SDWebImageDownloaderDecryptor> decryptor; // decrypt image data
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@ -112,6 +112,7 @@ BOOL SDWebImageDownloaderOperationGetCompleted(id<SDWebImageDownloaderOperation>
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_finished = NO;
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_expectedSize = 0;
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_unownedSession = session;
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_downloadCompleted = NO;
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_coderQueue = [[NSOperationQueue alloc] init];
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_coderQueue.maxConcurrentOperationCount = 1;
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_coderQueue.name = @"com.hackemist.SDWebImageDownloaderOperation.coderQueue";
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@ -338,6 +339,91 @@ BOOL SDWebImageDownloaderOperationGetCompleted(id<SDWebImageDownloaderOperation>
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return YES;
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}
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// Check for unprocessed tokens.
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// if all tokens have been processed call [self done].
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- (void)checkDoneWithImageData:(NSData *)imageData
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finisdTokens:(NSArray<SDWebImageDownloaderOperationToken *> *)finisdTokens {
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NSMutableArray<SDWebImageDownloaderOperationToken *> *tokens;
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@synchronized (self) {
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tokens = [self.callbackTokens mutableCopy];
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}
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[finisdTokens enumerateObjectsUsingBlock:^(SDWebImageDownloaderOperationToken * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
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[tokens removeObjectIdenticalTo:obj];
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}];
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if (tokens.count == 0) {
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[self done];
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} else {
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// If there are new tokens added during the decoding operation, the decoding operation is supplemented with these new tokens.
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[self startCoderOperationWithImageData:imageData pendingTokens:tokens finishedTokens:finisdTokens];
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}
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}
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- (void)startCoderOperationWithImageData:(NSData *)imageData
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pendingTokens:(NSArray<SDWebImageDownloaderOperationToken *> *)pendingTokens
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finishedTokens:(NSArray<SDWebImageDownloaderOperationToken *> *)finishedTokens {
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@weakify(self);
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for (SDWebImageDownloaderOperationToken *token in pendingTokens) {
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[self.coderQueue addOperationWithBlock:^{
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@strongify(self);
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if (!self) {
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return;
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}
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UIImage *image;
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// check if we already decode this variant of image for current callback
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if (token.decodeOptions) {
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image = [self.imageMap objectForKey:token.decodeOptions];
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}
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if (!image) {
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// check if we already use progressive decoding, use that to produce faster decoding
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id<SDProgressiveImageCoder> progressiveCoder = SDImageLoaderGetProgressiveCoder(self);
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SDWebImageOptions options = [[self class] imageOptionsFromDownloaderOptions:self.options];
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SDWebImageContext *context;
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if (token.decodeOptions) {
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SDWebImageMutableContext *mutableContext = [NSMutableDictionary dictionaryWithDictionary:self.context];
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SDSetDecodeOptionsToContext(mutableContext, &options, token.decodeOptions);
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context = [mutableContext copy];
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} else {
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context = self.context;
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}
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if (progressiveCoder) {
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image = SDImageLoaderDecodeProgressiveImageData(imageData, self.request.URL, YES, self, options, context);
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} else {
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image = SDImageLoaderDecodeImageData(imageData, self.request.URL, options, context);
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}
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if (image && token.decodeOptions) {
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[self.imageMap setObject:image forKey:token.decodeOptions];
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}
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}
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CGSize imageSize = image.size;
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if (imageSize.width == 0 || imageSize.height == 0) {
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NSString *description = image == nil ? @"Downloaded image decode failed" : @"Downloaded image has 0 pixels";
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NSError *error = [NSError errorWithDomain:SDWebImageErrorDomain code:SDWebImageErrorBadImageData userInfo:@{NSLocalizedDescriptionKey : description}];
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[self callCompletionBlockWithToken:token image:nil imageData:nil error:error finished:YES];
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} else {
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[self callCompletionBlockWithToken:token image:image imageData:imageData error:nil finished:YES];
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}
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}];
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}
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// call [self done] after all completed block was dispatched
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dispatch_block_t doneBlock = ^{
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@strongify(self);
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if (!self) {
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return;
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}
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// Check for new tokens added during the decode operation.
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[self checkDoneWithImageData:imageData
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finisdTokens:[finishedTokens arrayByAddingObjectsFromArray:pendingTokens]];
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};
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if (@available(iOS 13, tvOS 13, macOS 10.15, watchOS 6, *)) {
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// seems faster than `addOperationWithBlock`
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[self.coderQueue addBarrierBlock:doneBlock];
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} else {
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// serial queue, this does the same effect in semantics
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[self.coderQueue addOperationWithBlock:doneBlock];
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}
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}
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#pragma mark NSURLSessionDataDelegate
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- (void)URLSession:(NSURLSession *)session
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@ -478,7 +564,7 @@ didReceiveResponse:(NSURLResponse *)response
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}
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// When cancelled or transfer finished (`didCompleteWithError`), cancel the progress callback, only completed block is called and enough
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@synchronized (self) {
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if (self.isCancelled || SDWebImageDownloaderOperationGetCompleted(self)) {
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if (self.isCancelled || self.isDownloadCompleted) {
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return;
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}
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}
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@ -521,6 +607,8 @@ didReceiveResponse:(NSURLResponse *)response
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// If we already cancel the operation or anything mark the operation finished, don't callback twice
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if (self.isFinished) return;
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self.downloadCompleted = YES;
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NSArray<SDWebImageDownloaderOperationToken *> *tokens;
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@synchronized (self) {
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tokens = [self.callbackTokens copy];
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@ -565,64 +653,9 @@ didReceiveResponse:(NSURLResponse *)response
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} else {
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// decode the image in coder queue, cancel all previous decoding process
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[self.coderQueue cancelAllOperations];
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@weakify(self);
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for (SDWebImageDownloaderOperationToken *token in tokens) {
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[self.coderQueue addOperationWithBlock:^{
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@strongify(self);
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if (!self) {
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return;
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}
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UIImage *image;
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// check if we already decode this variant of image for current callback
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if (token.decodeOptions) {
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image = [self.imageMap objectForKey:token.decodeOptions];
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}
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if (!image) {
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// check if we already use progressive decoding, use that to produce faster decoding
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id<SDProgressiveImageCoder> progressiveCoder = SDImageLoaderGetProgressiveCoder(self);
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SDWebImageOptions options = [[self class] imageOptionsFromDownloaderOptions:self.options];
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SDWebImageContext *context;
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if (token.decodeOptions) {
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SDWebImageMutableContext *mutableContext = [NSMutableDictionary dictionaryWithDictionary:self.context];
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SDSetDecodeOptionsToContext(mutableContext, &options, token.decodeOptions);
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context = [mutableContext copy];
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} else {
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context = self.context;
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}
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if (progressiveCoder) {
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image = SDImageLoaderDecodeProgressiveImageData(imageData, self.request.URL, YES, self, options, context);
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} else {
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image = SDImageLoaderDecodeImageData(imageData, self.request.URL, options, context);
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}
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if (image && token.decodeOptions) {
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[self.imageMap setObject:image forKey:token.decodeOptions];
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}
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}
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CGSize imageSize = image.size;
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if (imageSize.width == 0 || imageSize.height == 0) {
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NSString *description = image == nil ? @"Downloaded image decode failed" : @"Downloaded image has 0 pixels";
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NSError *error = [NSError errorWithDomain:SDWebImageErrorDomain code:SDWebImageErrorBadImageData userInfo:@{NSLocalizedDescriptionKey : description}];
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[self callCompletionBlockWithToken:token image:nil imageData:nil error:error finished:YES];
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} else {
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[self callCompletionBlockWithToken:token image:image imageData:imageData error:nil finished:YES];
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}
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}];
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}
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// call [self done] after all completed block was dispatched
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dispatch_block_t doneBlock = ^{
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@strongify(self);
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if (!self) {
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return;
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}
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[self done];
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};
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if (@available(iOS 13, tvOS 13, macOS 10.15, watchOS 6, *)) {
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// seems faster than `addOperationWithBlock`
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[self.coderQueue addBarrierBlock:doneBlock];
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} else {
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// serial queue, this does the same effect in semantics
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[self.coderQueue addOperationWithBlock:doneBlock];
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}
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[self startCoderOperationWithImageData:imageData
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pendingTokens:tokens
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finishedTokens:@[]];
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}
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} else {
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[self callCompletionBlocksWithError:[NSError errorWithDomain:SDWebImageErrorDomain code:SDWebImageErrorBadImageData userInfo:@{NSLocalizedDescriptionKey : @"Image data is nil"}]];
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