Calling cancelAllOperations on an NSOperationQueue will simply call cancel on each of its operations. Making statements based on opinion; back them up with references or personal experience. Is there a way to get time from signature? Status 2015.10.04 The project has alpha status. Asking for help, clarification, or responding to other answers. How to exactly find shift beween two functions? You can use this server client class to manage all interactions with your external server. When I do a count check after canceling the operations I still get 4 but was expecting less (and hoping for 0). Short story in which a scout on a colony ship learns there are no habitable worlds. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, It looks like an operation may become cancelled before being started. Thanks to @KenThomases and @lead_the_zeppelin (see the comments in the OP) I was able to pinpoint the flaw in my code: Since I created the custom NSOperation subclass to import data to a Core Data model, my flaw was that the code which performs the import called from the -main method of the subclass, was embedded inside the scope of the block callback of the asynchronous performBlock method of the ManagedObjectContext that I am using to manage the import execution. This could be the issue, NSOperation remains in an NSOperationQueue after cancellation, The cofounder of Chef is cooking up a less painful DevOps (Ep. Also, if I try to see what operations are queued in my NSOperationQueue using the operations property, the array is empty. What are the downsides of having no syntactic sugar for data collections? Every Operation retains a StoreThumbRequest object encapsulating all request specific data including a target view, waiting for an image. Connect and share knowledge within a single location that is structured and easy to search. But I log the connectionDidFinishLoading delegate and so the first task is completed, so I was expecting at least that to be gone. An operation can be dependant on an operation in a different queue so you can put your final operation on a separate queue to the worker operations and use cancelAllOperations on the worker queue. Why do microcontrollers always need external CAN tranceiver? Although respecting the value returned by the isCancelled is expected of all operations, your code must explicitly check the value returned by this method and abort as needed. rev2023.6.28.43514. I have to hit my server continuously ie I will be calling my server whenever user types in the textbox. Connect and share knowledge within a single location that is structured and easy to search. In my case, to fix the issue, I changed performBlock: with performBlockAndWait:. Personally I think an array with operations to be cancelled is less hassle (except maybe the hassle of making sure to clean up properly). octy says: September 14, 2010 at 9:03 am. I perform downloading images using NSOperation and an NSOperationQueue. Thansk, So for my scenario I cant able to use nsoperation? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Find centralized, trusted content and collaborate around the technologies you use most. Can you legally have an (unloaded) black powder revolver in your carry-on luggage? In Operation start method I have this code. NSOperation remains in a queue only when it's cancelled. The NSOperation's block should be carefully divided into sub-block, such that it is safe to discontinue the execution of rest of the block. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. When/How do conditions end when not specified? Would limited super-speed be useful in fencing? I tried that even though my final API hit is not called immediately. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Theoretically can the Ackermann function be optimized? Making statements based on opinion; back them up with references or personal experience. solve my problem. For currently executing operations, this means that the operation object's work code must check the cancellation state, stop what it is doing, and mark itself as finished. Thus, back to super navigation view while the nsoperation is still running, the UI will become stuck! Xcode lists a possible replacement as addBarrierBlock: but with no documentation. How to transpile between languages with different scoping rules? Thank you Ismail ! When you cancel any operation, we have three scenarios that one of them will happen: -Your operation is already finished. Temporary policy: Generative AI (e.g., ChatGPT) is banned, NSOperation with dependency on another operation on a different queue does not start, Cancelling NSOperationQueue from within NSOperation, NSOperationQueue cancel specific operations, Objective c - Canceling operations in NSOperationQueue, [NSOperation cancelAllOperations]; does not stop the operation, NSOperationQueue doesn't stop when [operation cancelAllOperations] is called, NSOperation & NSOperationQueue Cancellation, How to cancel specific Operation from OperationQueue in swift, Alternative to 'stuff' in "with regard to administrative or financial _______.". Find centralized, trusted content and collaborate around the technologies you use most. You can call cancel on all the dependencies of your RenderCompleteOperation: Thanks for contributing an answer to Stack Overflow! broken linux-generic or linux-headers-generic dependencies. How to get around passing a variable into an ISR. Similar quotes to "Eat the fish, spit the bones". In CP/M, how did a program know when to load a particular overlay? +1 a quick example would be useful: MONOperation --, thanks, i put some self.isCancelled flag in the NSOperation to check some time in the download, and now works :). Temporary policy: Generative AI (e.g., ChatGPT) is banned, Get notification when NSOperationQueue finishes all tasks, ios NSOperationQueue, operations all run when added and don't queue. then what is the best way to hit the final api immediately. 584), Improving the developer experience in the energy sector, Statement from SO: June 5, 2023 Moderator Action, Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood. Store a NSOperation with Core . '90s space prison escape movie with freezing trap scene. Are there causes of action for which an award can be made without proof of damage? Can I 1031 split real estate, then move into both sequentially? Can you legally have an (unloaded) black powder revolver in your carry-on luggage? rev2023.6.28.43514. When/How do conditions end when not specified? I'm encountering some weird issues with some custom NSOperation instances queued in an NSOperationQueue instance: When I call either [myOperation cancel] or [myOperationQueue cancelAllOperations] the isCancelled getter for the cancel boolean remains unchanged for my custom NSOperation subclass instances. Asking for help, clarification, or responding to other answers. Can I safely temporarily remove the exhaust and intake of my furnace? Ios - NSOperationQueue cancel specific operations. The delays on main thread is due to a the mode of the runloop while you scroll. How well informed are the Russian public about the recent Wagner mutiny? How do I store enormous amounts of mechanical energy? How to exactly find shift beween two functions? Instead, it updates the objects internal flags to reflect the change in state. Did UK hospital tell the police that a patient was not raped because the alleged attacker was transgender? Replace all instances of the following line : It turned out, that in the 'main' method I did not check if the operation was already cancelled. Why do microcontrollers always need external CAN tranceiver? To learn more, see our tips on writing great answers. Temporary policy: Generative AI (e.g., ChatGPT) is banned. Exploiting the potential of RAM in a computer with a large amount of it. A third option is to keep an array of your worker operations and cancel each of them yourself in a loop (which is all cancelAllOperations does anyway). Asking for help, clarification, or responding to other answers. NSOperation running but missing from NSOperationQueue, Cancelling an NSOperation from another NSOperation. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. Asking for help, clarification, or responding to other answers. Why do microcontrollers always need external CAN tranceiver? If I understand you correctly, you have a NSOperationQueue and if your application enters the background, you would like to . Connect and share knowledge within a single location that is structured and easy to search. Edit: I don't need to save these operations as I am storing the incoming request in a mutable array and which just create a new OQ once they have been appended. So my final api hit is not called immediately. How do barrel adjusters for v-brakes work? Can you clarify? Thanks for contributing an answer to Stack Overflow! Or is it possible to ensure the message was signed at the time that it says it was signed? When/How do conditions end when not specified? Short story in which a scout on a colony ship learns there are no habitable worlds. For currently executing operations, this means that the operation objects work code must check the cancellation state, stop what it is doing, and mark itself as finished. rev2023.6.28.43514. To learn more, see our tips on writing great answers. Temporary policy: Generative AI (e.g., ChatGPT) is banned, Cancelling NSOperationQueue from within NSOperation, NSOperation best practice, responding to cancellation, Objective c - Canceling operations in NSOperationQueue, [NSOperation cancelAllOperations]; does not stop the operation, NSOperationQueue doesn't stop when [operation cancelAllOperations] is called, NsoperationQueue Cancel all operations is not cancelled until it finishes the operation. So I need a way to cancel just the RenderOperation objects and can't see how to do this without calling operations. I'm looking for a means to handle separate but related NSURLRequest and thought that I could add them to an NSOperationQueue and then manage them (run the request or not based on http status code - if the status code is 200 they can run, if not, stop all of them as the url string needs to be appended). How many ways are there to solve the Mensa cube puzzle? After adding all request to the OQ I then check to see if it has been suspended and if so, cancel all the operations.That works, at least the check if it has been suspended. NSOperationQueue is a higher-level Objective-C framework that provides a simplified interface for managing tasks. Theoretically can the Ackermann function be optimized? NSOperationQueue manages its internal queue of NSOperations. What steps should I take when contacting another researcher after finding possible errors in their work? Source - https://developer.apple.com/library/mac/documentation/Cocoa/Reference/NSOperationQueue_class/Reference/Reference.html. How to properly align two numbered equations? I'm trying to cancel the operations when the app delegate applicationWillResignActive method is called. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, The cofounder of Chef is cooking up a less painful DevOps (Ep. If it managed to finish its task, it is gracefully removed from its NSOperationQueue. I perform downloading images using NSOperation and an NSOperationQueue. Making statements based on opinion; back them up with references or personal experience. How to transpile between languages with different scoping rules? Multiple boolean arguments - why is it bad? I mean override the start method of that thread. You can cancel a particular operation or all operations for any given queue. (Is there a way to see this report?) So what happened was that the code inside -main was running asynchronously in another thread than my operation instance which, not surprisingly, was reporting that it finished its execution. If a GPS displays the correct time, can I trust the calculated position? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. When contacting us, please include the following information in the email: User-Agent: Mozilla/5.0 _iPhone; CPU iPhone OS 15_5 like Mac OS X_ AppleWebKit/605.1.15 _KHTML, like Gecko_ GSA/218.0.456502374 Mobile/15E148 Safari/604.1, URL: stackoverflow.com/questions/32282946/nsoperationqueue-cancel-all-operations-is-not-cancelled-until-it-finishes-the-op. What would happen if Venus and Earth collided? Get specific NSOperation from NSOperationQueue, The cofounder of Chef is cooking up a less painful DevOps (Ep. Your code says, NSOperation & NSOperationQueue Cancellation, The cofounder of Chef is cooking up a less painful DevOps (Ep. This retain loop is carefully broken at 'cancel' and 'main' methods in appropriate times. When does the NSOperationQueue remove an operation from the queue? the current operation thread completed rolling everything back and cleaning up)? NSOperationQueue and background support. Sometimes, I want to cancel some specific operations from my operation queue, that's why I have defined an identifier property for my NSOperation subclass : But when I loop into my queue's operations and I want to compare my operation's identifier to the identifier of the operation I want to fetch, I got an EXC_BAD_ACCESS pointing out the if condition: The operation's identifier should be something like 33a37fb0-8f77-0132-6c0b-5254005d9147 but when it crashes, it's something like 0x7be4af00 ( when I use po operation.identifier ). Thanks @jarora. But you can cancel the taskQueue like you're doing. declval<_Xp(&)()>()() - what does this mean in the below context? their priority and readiness. Find centralized, trusted content and collaborate around the technologies you use most. Does Pre-Print compromise anonymity for a later peer-review? Find centralized, trusted content and collaborate around the technologies you use most. rev2023.6.28.43514. Are there causes of action for which an award can be made without proof of damage? If a GPS displays the correct time, can I trust the calculated position? For example, Previously I was creating 100 operations if user types 100 characters now I will create some 20 operations for 100 characters. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. @Austin remark should be it's own independent answer. I need to know that When does a NSOperationQueue remove an operation from the queue? Not the answer you're looking for? Deallocate NSOperationQueue as soon as all operations in queue are finished. Manual It is waiting for some time (all operation have to finish) and then it called. When does an NSOperationQueue start its first operation? How can I cancel an NSOperation in the same thread that the operation? So I create one NSOperation for single API hit. Alternative to 'stuff' in "with regard to administrative or financial _______.". If the NSOperation does not override cancel then its never going to get cancelled. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. How is the term Fascism used in current political context? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. And put a custom KVO in the subclass of operation to quiet the operation immediately when needed. 584), Improving the developer experience in the energy sector, Statement from SO: June 5, 2023 Moderator Action, Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood. Exploiting the potential of RAM in a computer with a large amount of it. 0. declval<_Xp(&)()>()() - what does this mean in the below context? Reaching this limit prevented 'main' method of new NSOperations from being called. Not the answer you're looking for? cancel all operations and ; wait until the cancellations are processed. Displaying on-screen without being recordable by another app. If there is an operation in the queue it seems to cancel it but if it isExecuting then it doesn't seem to stop it. Can I 1031 split real estate, then move into both sequentially? How do I store enormous amounts of mechanical energy? When I do a count check after canceling the operations I still get 4 but was expecting less (and hoping for 0). . I now changed the way I run the NSRunLoop using 'runMode:beforeDate:'. How do barrel adjusters for v-brakes work? Where is it specifically documented that a dependency can be made to an operation in a different queue? 1. How common are historical instances of mercenary armies reversing and attacking their employing country? iOS 2.0+ iPadOS 2.0+ macOS 10.5+ Mac Catalyst 13.1+ tvOS 9.0+ watchOS 2.0+ Declaration - (void)cancelAllOperations; Discussion This method calls the cancel method on all operations currently in the queue. Another interesting thing is that in the same method which should cancel the operations, if I check with NSLog the isCancelled, isExecuting, isAsynchronous the booleans are set to NO but the isFinished boolean is set to YESeven though the operations are executing at that time. Can I just convert everything in godot to C#. What is the best way to loan money to a family member until CD matures? Objective c - Canceling operations in NSOperationQueue, [NSOperation cancelAllOperations]; does not stop the operation, NSOperation & NSOperationQueue Cancellation, iOS: Force to cancel Operation in NSOperationQueue. Basically your code for the operation should check isCancelled and stop if needed. Implement a cancel override in your Operation subclass. Making statements based on opinion; back them up with references or personal experience. Making statements based on opinion; back them up with references or personal experience. cancel () to cancel the operation, but you need to take additional steps to really stop your operation from running as cancel () only set the isCanceled property to true.
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