In the Dart programming language, an Isolate is a single-threaded unit of concurrency.
In the Dart programming language, an Isolate is a single-threaded unit of concurrency. Communication with others Isolates is done via message passing.
Questions tagged [dart-isolates]
296 questions
26
votes
5 answers
Flutter Isolate vs Future
I might have the wrong idea of Isolate and Future. Please help me to clear it up. Here is my understanding of both subjects.
Isolate: Isolates run code in its own event loop, and each event may run smaller tasks in a nested microtask queue.
Future:…
Panda World
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21
votes
3 answers
Dart: handle incoming HTTP requests in parallel
I am trying to write an HTTP server in Dart that can handle multiple requests in parallel. I have been unsuccessful at achieving the "parallel" part thus far.
Here is what I tried at first:
import 'dart:io';
main() {
…
Michael Hixson
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21
votes
3 answers
Will Dart execute isolates in parallel in a multi-core environment?
Question
Will isolates in Dart run in parallel utilizing all available cores on a multiple core environment, or will it multiplex on a single core?
Background
Google has described isolates (a single-threaded unit of concurrency) in the Dart…
Xyz
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12
votes
1 answer
Dart Error: Dart_LookupLibrary: library 'package:background_fetch/background_fetch.dart' not found
How can I solve this problem:
E/flutter (18287): [ERROR:flutter/shell/common/shell.cc(89)] Dart Error: Dart_LookupLibrary: library 'package:background_fetch/background_fetch.dart' not found.
E/flutter (18287):…
Maalmi
- 123
- 5
12
votes
2 answers
Multiple Isolates vs one Isolate
How isolates are distributed across CPU cores
In Dart, you can run multiple isolates at the same time, and I haven't been able to find a guideline or best practice for using isolates.
My question is how will overall CPU usage and performance be…
Mohammed Alfateh
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12
votes
1 answer
What thread / isolate does flutter run IO operations on?
In flutter when using the http package or doing general IO operations for example
import 'package:http/http.dart' as http;
http.Response response = await http.get(url);
if (response.statusCode == 200) {
var json = jsonDecode(response.body);…
ams
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12
votes
2 answers
Bidirectional communication with isolates in Dart 2
I'm trying isolates and I'm wondering how could I spawn some of them doing heavy computations that, when the root Isolate ask them for their current computing value they respond it, "on demand".
As far as I know, the only object that can be used as…
Nico Rodsevich
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11
votes
1 answer
"threads" in Dart using Flutter for web
I'm currently implementing a simulation for some mathematical problems. Since Flutter has such an easy way to create user interfaces and has web-support, I decided to use Flutter for this project. So far, everything works perfectly. The problem…
Alb
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11
votes
1 answer
Flutter - How do I compute a heavy task that includes a future without blocking the UI?
I'm creating an app that fetches posts from the internet as json. I parse the json into Post objects in flutter using a factory. A Post object includes a title, body and image. I display these posts in a listview with a listview builder. The heavy…
Gromdroid
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11
votes
1 answer
How can I dynamically construct a Dart script for spawnUri?
I want to dynamically construct and load a Dart script. How do I do this?
I know I can use Isolate.spawnUri to dynamically load a Dart script. However, I'm only aware that I can load from file: and http: URIs. This means I need to put my script…
Seth Ladd
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10
votes
2 answers
How to pass arguments (besides SendPort) to a spawned isolate in Dart
In this article, they spawned an isolate like this:
import 'dart:isolate';
void main() async {
final receivePort = ReceivePort();
final isolate = await Isolate.spawn(
downloadAndCompressTheInternet,
receivePort.sendPort,
);
…
Suragch
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10
votes
3 answers
is flutter (dart) able to make an api request in separate isolate?
I made a function to post notification to a topic. It works great in normally, then I put it in compute function and hope it can posts notification in the background. But it not works.
Here is my code:
void onSendMessageInBackGround(String message)…
Khánh Vũ Đỗ
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8
votes
1 answer
How to do several asynchronous I/O actions in Dart cleanly (Isolates)?
In Dart, there is a concept of Isolates. I have an application (that I'm experimenting in Dart) that has lots of asynchronous IO where each call (they are database calls) are dependent on the previous one. So I have ended up in a nested callback…
Tower
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8
votes
3 answers
Flutter: avoid UI freeze when massive Database operation is in progress
UPDATE (15 july 2020)
mFeinstein's response, for now, is the only answer which gives me the first acceptable solution.
QUESTION
I have to ask you what is the best approach for doing what i'm trying to do:
Calling a web service in async…
kinghomer
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8
votes
2 answers
In Flutter, how do we use Firebase Messaging onBackgroundMessage to create a notification, using flutter_local_notifications?
We are working on an encrypted chat application where we use Firebase Messaging for data notifications. Some client-side logic needs to be done upon receiving a data notification, before showing an actual notification to the user. For example, a…
b0nes
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