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func concurrent_setResizedImage(withURL url: NSURL) {
let backgroundQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
let mainQueue = dispatch_get_main_queue()
dispatch_async(backgroundQueue) { [frame] in
let resizedURL = photonize(url: url, forSize: frame.size)
let request = requestForImageUrl(resizedURL)
fetchData(request) { data in
dispatch_async(backgroundQueue, {
guard let image = imageFromResponseData(data) else {
return
}
dispatch_async(mainQueue, {
applyImage(image, to: self)
})
})
}
}
}
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