Data storage Pub/Sub is a Publisher/Subscriber platform, it’s not data storage. Published messages evaporate, regardless if there was any subscriber. In Redis Streams, stream is a data type, a data structure on its own right. Messages or entries are stored in memory and stay there until commanded to be deleted. Sync/Async communication (Push/Pull) Pub/Sub is … Read more
Let me explain all these things step by step. The CPU generates the logical address, which contains the page number and the page offset. The page number is used to index into the page table, to get the corresponding page frame number, and once we have the page frame of the physical memory(also called main … Read more
This function will save an image in the documents folder: func saveImage(image: UIImage) -> Bool { guard let data = UIImageJPEGRepresentation(image, 1) ?? UIImagePNGRepresentation(image) else { return false } guard let directory = try? FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false) as NSURL else { return false } do { try data.write(to: directory.appendingPathComponent(“fileName.png”)!) return … Read more
According to “What every programmer should know about memory”, by Ulrich Drepper you can do the following on Linux: Once we have a formula for the memory requirement we can compare it with the cache size. As mentioned before, the cache might be shared with multiple other cores. Currently {There definitely will sometime soon be … Read more
Generally one year is advised as a standard max value. See RFC 2616: To mark a response as “never expires,” an origin server sends an Expires date approximately one year from the time the response is sent. HTTP/1.1 servers SHOULD NOT send Expires dates more than one year in the future. Although that applies to … Read more
Like their names said: “Memory Cache” stores and loads resources to and from Memory (RAM). So this is much faster but it is non-persistent. Content is available until you close the Browser. “Disk Cache” is persistent. Cached resources are stored and loaded to and from disk. Simple Test: Open Chrome Developper Tools / Network. Reload … Read more
I know that this thread has been answered, but I have tried a library that has worked great. I was using ASIHttpRequest before and the difference is big. https://github.com/rs/SDWebImage Also, if someone needs to Resize or Crop the remote images, and have the same features that SDWebImage provide, I have integrated SDWebImage library with UIImage+Resize … Read more
Guava provides no way to refresh the cache in bulk, but you can schedule a periodic refresh yourself: LoadingCache<K, V> cache = CacheBuilder.newBuilder() .refreshAfterWrite(15, TimeUnit.MINUTES) .maximumSize(100) .build(new MyCacheLoader()); for (K key : cache.asMap().keySet()) { cache.refresh(key); } But in that case you may want to override the CacheLoader.reload(K, V) method in MyCacheLoader so it performs asynchronously. … Read more
I had the same problem and changing (incrementing) the version number in package.json before running the build command fixed it. For example by default the version number is set to “0.1.0” package.json file: { “name”: “project-name”, “version”: “0.1.1”, “private”: true, … }
The delay seems to be related to instantiating AVAudioPlayer for the first time. If I load any audio, run [audioPlayer prepareToPlay] and then immediately release it, the load times for all of my other audio is very close to imperceptible. So now I’m doing that in applicationDidFinishLaunching and everything else runs well. I can’t find … Read more