Questions tagged [asynchronous-programming]

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4
votes
1answer
126 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? ...
3
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1answer
110 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 ...
2
votes
1answer
833 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. ...
2
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1answer
65 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 ...
18
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3answers
38k 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 ...
2
votes
1answer
742 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 ...
2
votes
3answers
112 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 ...
7
votes
1answer
426 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-...
3
votes
2answers
256 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)...
5
votes
1answer
4k 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 ...
1
vote
2answers
842 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 ...
1
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0answers
53 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 ...
0
votes
1answer
773 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 ...
3
votes
1answer
316 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. ...
-1
votes
2answers
138 views

Designing an application with safe paralleled tasking

The title may have been a little vague... I am working on a piece of software that is designed to perform one task. I would like this task to work in parallel, allowing for multiple asynchronous ...
1
vote
1answer
579 views

Multi threaded and event driven [closed]

I got this problem in an interview and want to confirm multi threading adds no value here. Case: You are writing an agent to buy stocks. The agent is initialized with a set of stocks to buy when ...
1
vote
1answer
388 views

Need Async/Await equivalent for BackgroundWorker

Given the following code in the DoWork() event of a BackgroundWorker object, how can the concept be converted to the Async/Await model? I wish to execute multiple downloads simultaneously in order to ...
0
votes
1answer
95 views

What is the difference between running two blocks of code on the same thread and running them on two synchronous threads?

Suppose I have two blocks of code, A and B. A is to be executed before B. As I understand, I can do one of two things: 1) Put B in a separate thread that is to be executed after A's thread, or 2) Put ...
57
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8answers
9k views

Are events only used for GUI programming?

Are events only used for GUI programming? How do you handle in normal backend programming when something happens to this other thing?
2
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2answers
3k views

Using asynchronous calls for heavy IO operation: How to prevent crushing the CPU?

I have an application that reads a large binary file (1GB on average) and compresses into a bzip2 archive. I started out at first compressing these files synchronously, as I didn't want to impede ...
17
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3answers
5k views

API Gateway (REST) + Event-Driven Microservices

I have a bunch of microservices whose functionality I expose through a REST API according to the API Gateway pattern. As these microservices are Spring Boot applications, I am using Spring AMQP to ...
3
votes
1answer
907 views

Using and designing asynchronous APIs with naturally synchronous parts

I've been programming for a long time, but very rarely with anything asynchronous (and not often with anything to do with multithreading, either). Mostly for the fun of it, I'm writing a program to ...
0
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0answers
439 views

Is there a ddd approach for sending events about embedded aggregate views

I'm investigating how we can notify UI/async clients (websocket) about an update which happened in an embedded view. Let me elaborate... We currently have a newsfeed where NewsItem is an aggregate ...
0
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0answers
56 views

Handling error with Promise

I'm writing a small application in TypeScript that has to do some asynchronous operation and I'm doing it with Promise and async/await sugar. But my problem do not rely on the particular language or ...
0
votes
2answers
654 views

Method to mask variable names in C++ files (cpp, h) and create an intermediate API?

I have a project which involves using C++ files along with an API on a local PC to communicate with a remote server app, and for sake of maintaining a semblance of non-disclosure with any hired ...
4
votes
1answer
2k views

Is there use case for implementing a callback if a future is returned?

If I have function which returns a future, is there any reason to also include a callback where the callback is simply called right before the future completes? The only advantage I can think of ...
7
votes
1answer
3k views

“Reactive programming is programming with asynchronous data streams.” is this true?

I was reading about Reactive programming, and came across this article The introduction to Reactive Programming you've been missing with the quote I put in the question title: Reactive programming ...
0
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4answers
1k views

Callbacks without concurrency? [closed]

To sync on the terms I will first give my perspective on what a callback function in the simplest possible terms: A callback function is a function that is executed as a response to a certain ...
1
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3answers
1k views

Use case for async/await?

Background Most of the applications that I write are hour long sequential tests for electronic equipment. The equipment under test has a specification that is a state-machine that looks like... Get ...
3
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1answer
311 views

Trying to understand some async/await behavior

I was working on a bit of code for a personal project, when I came upon the need to generate checksums on large amounts of files. First off let me say I already solved this problem ideally using ...
2
votes
3answers
130 views

What is the right architecture for scalably scheduling and managing frequent periodic asynchronous?

I have built a setup which solves my problem, but I've pretty much just hacked it together by reading AWS docs and trying things out, so I want to see if there is a better way. For the purpose of ...
1
vote
1answer
1k views

Async I/O operations - proper way to avoid deleting object

Using async I/O operations from boost::asio I often need shared pointers (and enable_shared_from_this and shared_from_this in callbacks) to avoid deleting objects too early. I think that it could be ...
3
votes
3answers
12k views

Writing new code in async but calling sync

I am writing some new code and would like to write it using async and await, but the calling code does not currently support async. Is it right to write the new code in async and call it sync until ...
-1
votes
1answer
66 views

How to name functions which continue a process after an asynchronous step

Say that you have an web application which prints pages in a document. Suppose that after validating the page range, the application does the following: If a billing option is turned on, it first ...
2
votes
1answer
303 views

Would the APM be faster or more efficient than TAP?

I'm doing some research for a project in which I will need to create a service which can handle millions of requests per minute. Clearly I want to use an asynchronous programming model to make the ...
6
votes
2answers
751 views

Synchronous facade hiding asynchronous web service

I'm maintaining a system providing a typical synchronous web service REST API. It routes each request to one of several possible backend services. Now there is a new backend I want to use, but there ...
1
vote
1answer
1k views

HTTP Async/Await Task: avoid flooding server with requests?

I have a scenario where I have a Windows Store Application, there is a page with a search functionality, the user types names in a textbox and the app searches for names similar to the typed text. ...
0
votes
1answer
740 views

Is the logic behind `Asyncio.wait()` and async/await, the same, just the code is written differently (syntax)?

I'm learning Python, more specially parallel programming using Python Parallel Programming Cookbook by Giancarlo Zaccone. At the time the book was published async/await was still in the beta version ...
96
votes
1answer
61k views

Is there really a fundamental difference between callbacks and Promises?

When doing single-threaded asynchronous programming, there are two main techniques that I'm familiar with. The most common one is using callbacks. That means passing to the function that acts ...
5
votes
1answer
2k views

UML: Should an asynchronous request-response message exchange be modelled as two ports/interfaces or one

I want to model an asynchronous request-response message exchange in UML. The request is sent from a client to a server. The server responses asynchronously. This can be modelled in a component ...
0
votes
1answer
871 views

Do any languages have syntax for promises? [closed]

I'm really glad that EcmaScript 6 has promises built into the language, but the syntax will still be quite wordy: new Promise(f).then(r => { ... }).then(r2 => ... }).catch(... I'm just ...
6
votes
1answer
1k views

Best practice for parameters in asynchronous APIs in Java

Is there a best practice for using Guava's ListenableFuture in parameters in API calls? Compare these two versions of an interface that internally does a compare-and-set (I'm using Guava's ...
5
votes
1answer
2k views

How is one supposed to deal with the intermediate buffer of DataReader class?

Summary I am developing a WAV file format reader under WinRT, and for this I need to read random amounts of structs consisting of fundamental types such as int, uint, float and so on. Back in ...
2
votes
1answer
1k views

How should I handle the fetching of cached data in iOS

I'm developing an app at work, this is my first big application and in my smaller projects I didn't use caching at all. What's currently happening When the user logs on for their very first time ...
5
votes
1answer
2k views

C# async/await: Pedantry vs. the Debugger

I'm playing around with async and await, and they seem pretty intuitive, but some of the things I'm reading about these keywords doesn't make sense to me. In fact, some of it seems to me to be flat-...
21
votes
1answer
9k views

Does Akka obsolesce JMS/AMQP message brokers? [closed]

I spent the last week deep diving into the Akka docs and finally understand what actor systems are, and the problems that they solve. My understanding (and experience with) traditional JMS/AMQP ...
2
votes
2answers
2k views

Reading using non-blocking IO on a fd asynchronously in C++ (moving from Node.js)

I'm trying to switch my brain from Node.js/Objective-C iOS programming to C++ programming, and it's a little bit taxing. Node.js and Objective-C with iOS do not have a run loop that I am supposed to ...
3
votes
1answer
294 views

Connection between futures and exceptions?

Is there a connection between futures and exceptions? async-await looks very similar to throw-catch.
3
votes
2answers
617 views

Async library guidance

I'm creating a library that contains a class that exposes several Async methods: public class MyClass { public async Task<Foo> DoFooAsync() { /*...*/ } public async Task<Bar> ...
2
votes
1answer
1k views

JS Async: . Can I forget callbacks all together and replace with promises and/or generators [duplicate]

I've been using Nodejs and I really dislike callbacks (as i think most people do.) I'm starting to learn about promises and generators. Both are a lot cleaner and I'd like to forget the horrors of ...