Questions tagged [asynchronous-programming]
The asynchronous-programming tag has no summary.
185 questions
0
votes
1
answer
201
views
I'm writing an application that needs to log error/ exception messages but should still continue execution if it not a fatal error
I'm writing an application that needs to log error/ exception messages but should still continue execution if the error is not a fatal error. I was thinking of making a method that returns a Task but ...
- 163
0
votes
1
answer
487
views
Heroku request timeout vs Nodejs architecture
At this link (https://blog.heroku.com/timeout-quickly#how-webservers-work), I read:
All webservers will work in a similar way. Any new request will go to
a queue, and the server will process them ...
- 141
0
votes
1
answer
277
views
Should repositories always return Rx Single or Observable?
Let' assume we have an IFiltersRepository repository that provides data about a list of "filters" that are used on the search screen of an app (filter by color, by price etc).
The repository has the ...
- 195
1
vote
2
answers
446
views
Acceptable to use synchronous call to another microservice for time-sensitve state change?
Say there are two microservices (example is simplified)
PickupRequestService: lists pick-up requests of passengers
DriverService: drivers use to accept pickup requests
On a completely decoupled ...
- 343
13
votes
1
answer
10k
views
Is the C# async/Task construct equivalent to Java's Executor/Future?
I'm a long time Java developer, but with so little traffic on SE, I don't limit my viewing to any single tags. I've noticed that C# questions with async/await come up a lot, and as far as I've read it'...
- 1,980
0
votes
2
answers
611
views
Turn an asynchronous delegate pattern into a blocking method
I have to use a built-in API that works like this
class MyAPIWrapper {
func callAPI() {
apiObj.delegate = self
apiObj.doWork() // returns immediately, eventually calls self.delegate....
- 186
0
votes
1
answer
246
views
Which message pattern should I use?
I'd like to develop a microservice architecture application that sends text messages from one communication provider to another and I'm just considering changing architecture would be best suited to ...
- 11
34
votes
14
answers
14k
views
Why don't programming languages automatically manage the synchronous/asynchronous problem?
I have not found many resources about this: I was wondering if it's possible/a good idea to be able to write asynchronous code in a synchronous way.
For example, here is some JavaScript code which ...
- 483
-4
votes
2
answers
293
views
Should I use async for networking application/library [closed]
I decided to make an application, networking application, don't know what it has to do yet but mainly it should be a cross-client kind of like framework networking application/library.
Since ...
1
vote
1
answer
1k
views
Querying in event driven microservices
I am trying to get my head around "event driven" microservices. I understood, there are several techniques and patterns, like event notification, event sourcing, CQRS, etc that can help us to achive ...
- 121
1
vote
1
answer
429
views
Refactor asynchronous code in C#
I got the following code snippet:
public Task DistributeAsync(BankAccount account, decimal amount)
{
lock (account)
{
return repository.AddLoanAsync(account, amount).ContinueWith(task ...
- 19
4
votes
2
answers
5k
views
Is it okay for async function to update a common object
I have a couple of functions, each function verifies a set of rules and updates a common object. The common object is just a container that holds a list of rules that passed or failed. I would like to ...
- 163
51
votes
4
answers
14k
views
Who did async/await first?
Python added the async/await constructs in 3.5 in 2015. The Javascript community made steps towards it for a bazzillion years and finally added a very similar implementation to the draft in ES8 ...
- 3,106
3
votes
1
answer
147
views
Future/Promise objects in Controllers - Best practice - MVC [closed]
I was going through some articles related to Futures and Callables today and was thinking about the best practices when working in an MVC based environment.
I was wondering, should one be creating ...
- 147
3
votes
3
answers
281
views
How are new bounded contexts deployed, and bugs fixed, in message-driven "autonomous" microservice architectures?
I'm coming from the monolith background, using a single large relational database. From my research, many proponents of the microservice architecture favor the event-driven rather than REST driven ...
- 209
1
vote
1
answer
223
views
sequential command processing with an async io cloud upsert
We are new to c# and still trying to grok the async idioms.
We have a windows service that requires us to iterate a list of results queried from a PC database to feed the parse cloud server (which ...
- 119
2
votes
2
answers
2k
views
When consuming an api, what is a good way to deal with their request limits?
My app is consuming a third party api. One of the requirements of this api is that my app cannot send more than 20 requests per second. Because of the nature of this app, and because my user base is ...
- 159
4
votes
1
answer
1k
views
Is it generally bad to await async operations in background processing (not needing the result)
So I've been working with background processing and event-driven systems, namely Azure WebJobs and ServiceBus. And while there is extensive use of async/await programming, I'm always wondering if it ...
- 151
0
votes
1
answer
2k
views
How to avoid synchronous communication between microservices
Let's say we're talking about a webshop.
Microservice 1: Manages products and their prices
Microservice 2: Responsible for payment and checkout.
If a user wants to pay for a product, the payment ...
- 201
0
votes
1
answer
196
views
How do I not lose the "reactive" nature of my services, simply because one of the services isn't reactive?
I've lately been very interested in reactive microservice design with streaming and event-driven architectures.
When one writes (i.e., manages) services, this paradigm works extremely well by simply ...
- 241
4
votes
2
answers
2k
views
CQRS async query from command handler
In a CQRS/async microservices context, I have a command handler e.g. SendOrderConfirmationEmailCommandHandler implemented in a communications service.
This depends on information from the orders ...
- 141
0
votes
2
answers
4k
views
When to check if the user is logged in?
I have an app with an optional login where some functionality requires the user to login.
When checking if the user is logged in I use a framework that runs an async function that requests an access ...
- 476
4
votes
1
answer
213
views
Design for avoiding concurrent calls to an interface implementation
The application I'm developing requires that some data is obtained through different channels. As this is a network process, I have decided to use async programming.
I have designed the following ...
2
votes
1
answer
107
views
How do I approach polyglot plugins for asynchrous python applications?
I've been looking at ways to let my app's users write plugins for it. However, to give them more options, I decided to implement a polyglot plugin system.
From the engineering perspective there are ...
- 131
1
vote
1
answer
360
views
How do I set up short-lived queues?
This scenario seems pretty ordinary, and yet, strangely, messaging systems (like Google Cloud PubSub and Task Queues and ActiveMQ) do not seem to support it -- they assume that topics/queues are long-...
- 1,110
0
votes
1
answer
1k
views
An elegant way to detect the end of an asynchronous recursive file search?
Given a recursive subroutine in single threaded environment which starts numerous asynchronous I/O operations and registers callback functions for each of them. This callbacks will be called on the ...
- 111
-1
votes
2
answers
880
views
Straight line coding - How multithreading simplify asynchronous workflow?
Java author mentions: Threads can simplify the development of complex systems by turning complicated asynchronous code into simpler straight-line code.
Again the book says: Threads make it easier to ...
- 769
3
votes
1
answer
505
views
Composable asynchronous programming in Java without too much GC
Assume I'm writing a library in Java for performing network calls. I want it to be efficient for cases like highly loaded reverse proxies etc (10s to 100s Krps coming in and out; client requests ...
- 179
1
vote
1
answer
2k
views
Best practice to callbacks in OOP (JavaScript)?
For anyone who uses callbacks, how do I approach it when the method is an asynchronous setter?
Here's an example
class API
{
constructor()
{
this.token = null;
}
refreshToken(callback)
...
- 171
4
votes
1
answer
25k
views
Correct usage of async/await and Task.Run()
I am developing an application that will read excel files from disk and then process tests based on the data in the files. In order to keep the user interface from locking up when loading files and ...
- 153
5
votes
4
answers
4k
views
How do I know if my async function is truly asynchronous?
I'm writing a function in the node.js-style asynchronous way, but how do I know if these functions are truly asynchronous, i.e., that they run in parallel and not sequentially?
Here is my code (...
- 264
3
votes
3
answers
1k
views
Is there a pattern for a chain of asynchronous calls, followed by a cleanup?
I have two asynchronous tasks that need to get completed - say they're "make a pie" (make) and "bake a pie" (bake). I also need to cleanup after everything's done - "clean the kitchen" (cleanup). bake ...
- 227
5
votes
3
answers
2k
views
Providing a non-blocking IO API in a C library
I am working on a C library (SlipRock) for interprocess communication.
The library currently exposes a simple, blocking API. This is easy to use, makes misuse (relatively) difficult (this is C after ...
- 826
7
votes
3
answers
1k
views
Why do many languages semantically distinguish "async" functions from "non-async" ones?
I've seen this in C#, Hack, and now Kotlin: await or an equivalent operation can only be performed in special "async" contexts. Return values from these are, to borrow Hack's terminology, "awaitable" ...
- 517
5
votes
2
answers
349
views
Design of asynchronous component
I'm trying to design an asynchronous component. Requirements on this component are :
Component might receive events at any point in time
Component might start a long-running operation and wait for its ...
- 38.2k
1
vote
0
answers
100
views
Capturing keyboard events for a limited time
I'm trying to code a kind of simple video game where there are two kind of players:
Human Players: They enter an keyboard input
CPU Players: A random input is calculated
For Human Players there is a T ...
- 355
4
votes
1
answer
150
views
Building objects from multiple async server queries
I'm building a system that uses objects that are built using multiple Async queries to a remote server (Firebase) and queries to a local DB.
How should I design a module to generate these objects?
...
- 41
3
votes
1
answer
159
views
How to document logical proofs against race conditions?
Specific Background
I'm writing a library to extend the async backbone of a language with cooperative multitasking. (The language is Hack, but C# also implements async-await with Task, if the concept ...
- 517
2
votes
1
answer
941
views
Task Parallel Library Console Application Design - How do I lock a thread to a specific context?
I'm currently developing an application which relies on multiple sockets listening for chat messages. When the messages come in, they're passed off to a bot that's associated with their channels. ...
- 89
3
votes
1
answer
73
views
Asyncronous processes competing for the output area
You enter the URL in the address string of your browser. It takes long time to appear in the client area. You are bored and type another address instead and click enter. Which page will be rendered in ...
- 367
24
votes
3
answers
47k
views
Calling multiple async services in parallel
I have few async REST services which are not dependent on each other. That is while "awaiting" a response from Service1, I can call Service2, Service3 and so on.
For example, refer below code:
var ...
- 1,638
2
votes
1
answer
951
views
Animations and React -- is it bad practice to mix them?
I have been in arguments with programmers that mixing elements with animations and react is very bad practice, and that all animations should be in a style sheet because that is something ...
- 121
2
votes
3
answers
140
views
Synchronising results from asynchronous tasks
In Android, I rather frequently need to get results from more than one service that utilizes an asynchronous callback pattern and I want to know if there's a better way to handle this pattern than ...
- 343
7
votes
1
answer
478
views
API design: stream objects vs. functions vs. messages
I'm designing API for a python library that accepts asynchronous input and produces the asynchronous output: various signals come in, and various signals are generated in response (there's no one-to-...
- 1,115
3
votes
2
answers
351
views
What to call a method that calls itself asynchronously?
In UI-related code, I often end up writing a construct like this:
function doItOnceAndRepeat() {
if (!stillNeededToDoIt()) {
return;
}
doIt();
runLater(doItOnceAndRepeat, 1000)...
- 243
7
votes
1
answer
6k
views
Does omitting await keyword once in the call stack break the asynchronous behavior of the whole stack?
Call stack may contain several methods returning Task. If all of them are decorated with async, the flow of execution is quite simple. However, what if one of them is not awaited - are other method ...
- 543
2
votes
2
answers
2k
views
Why are Promises not "awaited" by default?
In the latest version of languages like TypeScript or ECMAScript you can use async/await constructs to write code that combines the clean structure of synchronous programming with the performance ...
- 288
1
vote
0
answers
80
views
How to display a very delayed success message after async method call in WinForms after Form is closed
The users are on a Windows Form where they fill out a fax cover sheet and hit Send. The remote fax service takes anywhere from two seconds to two minutes to return a result (long timeout). By that ...
- 219
0
votes
1
answer
867
views
Android Activitiy and Service Sync
I've looked for the solution of my problem but I've failed in finding a suitable answer.
I've been trying to develop an Android application with heavy asyncronous networking capabilities. The problem ...
- 101
3
votes
1
answer
489
views
What is the functional programming method for combining two "streams" of data?
I'm trying to figure out what the appropriate way to deal with this problem is in a functional way. I'm assuming there's a functional data structure or technique that will make this easy to handle.
...
- 133