future

Retry a function that returns a Future

由 安稳与你 提交于 2020-01-21 08:59:25
问题 Suppose I've got a function foo that performs asynchronous computation and returns a Future : def foo(x: Int)(implicit ec: ExecutionContext): Future[Int] = ??? Now I'd like to retry this computation n times until the computation succeeds. def retryFoo(x: Int, n: Int)(implicit ec: ExecutionContext): Future[Int] = ??? I would like also to return all exceptions thrown while retrying. So, I define new exception class ExceptionsList and require retryFoo to return ExceptionsList when all retries

Flutter Isolate vs Future

由 ▼魔方 西西 提交于 2020-01-21 06:25:47
问题 I might get the wrong idea of Isolate and Future, please help me to clear it up. Here are 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: A Future is used to represent a potential value, or error, that will be available at some time in the future. My confusions are: The doc says Isolate has it own loop? I feel like having its own event queue makes more sense to me, am I wrong? Is

Flutter Isolate vs Future

由 坚强是说给别人听的谎言 提交于 2020-01-21 06:25:05
问题 I might get the wrong idea of Isolate and Future, please help me to clear it up. Here are 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: A Future is used to represent a potential value, or error, that will be available at some time in the future. My confusions are: The doc says Isolate has it own loop? I feel like having its own event queue makes more sense to me, am I wrong? Is

C++11>future，promise

由 懵懂的女人 提交于 2020-01-18 23:56:22
future // promise example # include <iostream> // std::cout # include <functional> // std::ref # include <thread> // std::thread # include <future> // std::promise, std::future void print_int ( std : : future < int > & fut ) { int x = fut . get ( ) ; std : : cout << "value: " << x << '\n' ; std : : system ( "pause" ) ; } int main ( ) { std : : promise < int > prom ; // create promise #创建promise std : : future < int > fut = prom . get_future ( ) ; // engagement with future #与future绑定 std : : thread th1 ( print_int , std : : ref ( fut ) ) ; // send future to new thread #将future传入promise prom .

Can't read a simple payload making HTTP request via hyper::client::Client: the trait bound `Body: Future` is not satisfied

由 浪尽此生 提交于 2020-01-15 12:26:05
问题 I am attempting to convert a Result to a Buffer : let ufc_root: String = String::from("https://www.ufc.com/athletes/all?filters%5B0%5D=status%3A23"); // let ufc_root: String = String::from("https://www.google.com"); let https = HttpsConnector::new(4).unwrap(); let client = Client::builder().build::<_, hyper::Body>(https); client .get(ufc_root.parse::<hyper::Uri>().unwrap()) .and_then(|res| { println!("http status code: {}", res.status()); println!("http response headers:\n{:?}: ", res.headers

How to return socket data from Future in Dart?

由 不羁岁月 提交于 2020-01-15 09:23:08
问题 Likely I send data to server and get data back even very big data using code below between =========== lines. This was to my experiment for I need to some intermediate solution so I can connect my Flutter app to tcp socket. For this I choose auqeduct.io. Today help from Gazi I found the solution to complete my code between =========== lines. Because of I am using auqeduct their handle function look like this. @override Future<RequestOrResponse> handle(Request request) async { So, I try to

How to return socket data from Future in Dart?

由 ☆樱花仙子☆ 提交于 2020-01-15 09:23:06
问题 Likely I send data to server and get data back even very big data using code below between =========== lines. This was to my experiment for I need to some intermediate solution so I can connect my Flutter app to tcp socket. For this I choose auqeduct.io. Today help from Gazi I found the solution to complete my code between =========== lines. Because of I am using auqeduct their handle function look like this. @override Future<RequestOrResponse> handle(Request request) async { So, I try to

How do you convert a list future to a list to use as a variable not a widget?

由 雨燕双飞 提交于 2020-01-15 03:07:09
问题 I'm trying to implement the PaginatedDataTable class in flutter. A required field in the constructor of this class, is the class DataTableSource . Looking at the data table example in the material section of the flutter gallery examples here. There is a member variable for the DataTableSource called List<Dessert> _desserts where it's values are hard coded. In my implementation, I'm making a http call and returning some json to be decoded. List<Result> parseResults(String responseBody) { final

Can't import annotations from __future__

由 别来无恙 提交于 2020-01-14 07:38:26
问题 When running the statement from __future__ import annotations I get the following error: Traceback (most recent call last): File "/usr/lib/python3.5/py_compile.py", line 125, in compile _optimize=optimize) File "<frozen importlib._bootstrap_external>", line 735, in source_to_code File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed File "./prog.py", line 1 from __future__ import annotations ^ SyntaxError: future feature annotations is not defined During handling of the

Dismissible confirmDismiss in combination with new route navigation causes Flutter crash

由 二次信任 提交于 2020-01-13 20:27:54
问题 The context: I stumbled upon a minor crash while testing a ListView of Dismissible s in Flutter. When swiping a dismissible, a Dialog is shown using the confirmDismiss option, for confirmation. This all works well, however the UI crashes when testing an unlikely use case. On the page are several options to navigate to other (named) routes. When a dismissible is swiped, and during the animation an option to navigate to a new route is tapped, the crash happens. How to replicate the crash:
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