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Testing out interaction between Dart Futures and Dart Isolates
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| /// SPDX-License-Identifier: Apache-2.0 | |
| /// Based on source code in https://levelup.gitconnected.com/fluttering-dart-futures-and-isolates-6b4bce6d804b | |
| import 'dart:math'; | |
| import 'dart:isolate'; | |
| class Cat { | |
| var index; | |
| var meowDelay; | |
| Cat(int index, int meowDelay) { | |
| this.index = index; | |
| this.meowDelay = meowDelay; | |
| } | |
| /// Wait a given number of seconds, meow, and then run `afterMeow`. | |
| void meow(Future<void> afterMeow) async { | |
| await Future.delayed(Duration(seconds: meowDelay)); | |
| print('Kitten $index: Meow!'); | |
| await afterMeow; | |
| print('Kitten $index has finished.'); | |
| } | |
| } | |
| Future<void> createMeowFuture(int index) async { | |
| return print('Just meowed! ($index/10)'); | |
| } | |
| void main() async { | |
| final timeInterval = 10; | |
| final random = Random.secure(); | |
| // Request 10 meows. | |
| await doLoop(random, timeInterval); | |
| // TODO: Wait for all of those meows to finish | |
| print('Just finished!!'); | |
| } | |
| /// Correct | |
| // Kitten 0: Meow! | |
| // Just meowed! (0/10) | |
| // Kitten 1: Meow! | |
| // Just meowed! (1/10) | |
| // Kitten 2: Meow! | |
| // Kitten 3: Meow! | |
| // Just meowed! (2/10) | |
| // Kitten 4: Meow! | |
| // Kitten 5: Meow! | |
| // Just meowed! (3/10) | |
| // Kitten 6: Meow! | |
| // Kitten 7: Meow! | |
| // Just meowed! (4/10) | |
| // Just meowed! (5/10) | |
| // Kitten 8: Meow! | |
| // Kitten 9: Meow! | |
| // Just meowed! (6/10) | |
| // Just meowed! (7/10) | |
| // Just meowed! (8/10) | |
| // Just meowed! (9/10) | |
| // Just finished!! | |
| /// Incorrect | |
| // Just meowed! (0/10) | |
| // Just meowed! (1/10) | |
| // Just meowed! (2/10) | |
| // Just meowed! (3/10) | |
| // Just meowed! (4/10) | |
| // Just meowed! (5/10) | |
| // Just meowed! (6/10) | |
| // Just meowed! (7/10) | |
| // Just meowed! (8/10) | |
| // Just meowed! (9/10) | |
| // Just finished!! | |
| Future<void> doLoop(Random random, int timeInterval) async { | |
| for(var i=0; i<10; i++) { | |
| final kitten = Cat(i, random.nextInt(timeInterval)); | |
| await Isolate.spawn(kitten.meow, createMeowFuture(i)); | |
| } | |
| } |
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@Cliabhach below is just idea... i dont know if help or not!
i think this is just basic problem about
try understanding the below part code....
https://itnext.io/minimalist-guide-to-isolates-in-dart-flutter-dd5bdee031e
one more idea in your case you should understand how and why you want spawn is there is better design you can write your code..