Questions tagged [asynchronous-programming]

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What is the best pattern to implement in order for distributed services which don't communicate to iterate asynchronously through rows of a db table?

Assuming you have multiple servers separately running applications which need to asynchronously process data from a database table, without processing any of the rows multiple times, what would be the ...
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1answer
222 views

Could the async keyword be eliminated in a new programming language?

This post implies that the creators of Rust had to add the "async" keyword to make the async/await functionality backward compatible. Why do we need the async keyword? In a new language, ...
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1answer
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Does native async implementation in languages like Python and C# Solve the "Free Lunch is Over" problem? [closed]

A while ago Herb Sutter wrote The Free Lunch Is Over: A Fundamental Turn Toward Concurrency in Software which I basically interpret to mean that, in order to improve performance, software engineers ...
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2answers
137 views

Does async IO use less energy than multithreading? [closed]

Given the same application written with multi-threading and async IO, will async IO use less power on a computer?
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1answer
75 views

How can message queues improve scalability?

I have read in a DDD book that using message queues between communicating services can make the whole architecture more scalable, amazon's documentation mentions that queues provide granular ...
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1answer
109 views

Why isn't JavaScript always async? [duplicate]

In JS, code runs single-threaded, that's why asynchronicity is necessary. I cannot use code like result = someRequest(), instead I need to give it a callback someRequest(resultCallback) or write a ...
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3answers
96 views

Is it better (or preferred) to initialize allocate and free structures used by a thread, "inside the thread"

Let's say we are building a threaded program in C, for example a message queue system where a thread is spawned to manage one end of the queue, and (re)connect sockets. This can roughly be set up in ...
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3answers
188 views

Confusion with asynchronous programming

I have been reading about the concept but still it doesn't make sense to me. I want to clarify my question by giving an example. First of all, if we have task1 and task2 which have to run in sequence, ...
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3answers
139 views

What happens in terms of call stacks when 10000 setTimeouts are called?

Say we call 10000 setTimeouts, each with a random time, each with a few nested timeouts too. What happens in terms of the 1 call stack, or are there multiple call stacks? How does that work? So for ...
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2answers
152 views

Why/When do we need to call an async method from a sync method?

It is my first question here so I hope I'm not doing a mistake. I see a plethora of questions in SO that people ask "how can I call an async method from a sync method?". Given my little ...
0
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1answer
86 views

How do Asynchronous Webserver (FastApi, Quart etc.) handle many Requests better than synchronous Webservers

I started using Pythons async features and want to fully understand their use cases. I see webserver like FastApi or Quart which use async features. How are they working different from webservers like ...
0
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1answer
130 views

Is this the right way to call async and await

Hi I am new to async/await in C# . I have created a controller which is accessing result from HttpClient injected through HttpFactory. Here is my working example class MyController { private ...
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1answer
76 views

In an MVC-patterned app, how should one build the interface between model and user interface layers to work nicely with threading?

I am wondering about this. This is a sort of follow-up to my last question here: In the MVC pattern, what has the responsibility for creating the view? because now I've run into the question of how to ...
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1answer
196 views

How do I make items disappear based on the size of it's members?

Consider a list of items (take a list of voice channels) where each item has these attributes System::vc: List of voice channels. System::on_join(member, before, after): On the event when a member ...
2
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1answer
116 views

How to design asynchronous communication in microservices?

Intro Hey, my question is kind of hard to explain so I apologize in advance. Question I'm trying to implement microservices for our ecommerce and I'm having issues on how to respond to a request when ...
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1answer
175 views

Is async/await a good alternative for locks in JavaScript?

Yes, I know, the question title is a bit provocatory. But let me explain. I needed to execute a sequence of async tasks in JavaScript. They are async because I need them to be non-blocking, but I ...
1
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1answer
206 views

std::future everywhere? Why or why not? [closed]

I recently had a discussion with colleagues about the use of futures (std::future in C++) or asynchronous calls in server applications. On one hand, if you have server logic that needs to access an ...
0
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1answer
111 views

How to maintain SRP with a chain of async functions?

For code maintainability I understand that it is generally better to have code structured like this: void abc() { a(); b(); c(); d(); } Instead of like: void abcd() { a(); bcd(...
1
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1answer
144 views

What is the name of this kind of (intra-process, inter-thread, queue-based) event system?

Context Espressif's embedded development libraries for the ESP32 microcontroller contain an event system based on FreeRTOS. The event system handles connectivity, interrupts and other IO activity, but ...
0
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1answer
73 views

Handling background tasks that may not be relevant when they are completed

Imagine the following pattern: you have a window with information that needs to be updated asynchronously. You launch and detach a thread to handle fetching the information, but while the information ...
1
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1answer
44 views

How could I optimize an AJAX-based site by avoiding unnecessary/duplicate file-reads for each AJAX call?

I'm an IT guy (read: not a professional programmer) and have made an internal monitoring webtool which allows users to search for printers on our print servers. Based on the filtering criteria given, ...
0
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1answer
245 views

What is the relationship between reactive programming and stream processing engines?

When would I use reactive programming libraries like RX Java and Project Reactor compared to stream processing engines such as Storm and Flink? I am aware that these concepts might not be directly ...
0
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1answer
3k views

How to approach a large number of multiple, parallel HttpClient requests?

I have a website which offers pages in the format of https://www.example.com/X where X is a sequential, unique number increasing by one every time a page is created by the users and never reused even ...
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2answers
140 views

What is the best practice for incorporating asynchronous code in this case?

Context: I'm building a popup widget. The html and css files are stored in S3. I need to get those files asynchronously and then continue with the rest of the logic. In the code below, I'm getting ...
4
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1answer
375 views

Is this a good design for wrapping asynchronous API calls into a RESTful interface?

I'm working with an API that has many asynchronous calls and handlers. I'd like to extend these with a RESTful interface and endpoints in spring. I'm imagining the usual Controller and Service layers, ...
2
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1answer
229 views

Implementing both Sync and Async clients with DRY

I'm developing a client library. I'd like to provide both Sync and Async interfaces to endpoints on a server. They would be rather easy to implement as completely separate entities, but I would like ...
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2answers
76 views

How to GET multiple values from a database while keeping the request asynchronous?

This is a very small-scale project that I am coding myself, so I am able to build all of the resources however I like. I've done research on this site for help on this issue and can't find anything ...
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2answers
2k views

Is it good approach to await async tasks in object destructor?

I'm currently working on class with some async tasks under the hood. In fact I need to delegate few tasks to asynchronous execution and be sure that all of them are finished before class was destroyed,...
2
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2answers
205 views

Design tips for waiting for a user input while working on another thread

I am working on an application with multiple threads (using Qt, C++). One of this threads is designed to execute a batch of operations like reading/writing from/to files as well as creating new ones. ...
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0answers
32 views

Using TPL to manage hundreds of contexts

Overview of application: A chat bot that connects via IRC, using TPL. As messages come from the socket (from .ReadAsync()), they are ultimately parsed and passed to a handler within the bot itself (...
2
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2answers
137 views

Name of locking approach

I've seen this approach several times, both in async and multithreaded code. A counter is used to track asynchronous behavior or thread behavior - whenever a new action is started, the counter is ...
5
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3answers
2k views

Why is it necessary for every new api to be async?

I'm expressing my frustration here somewhat, but why do many new libraries only have asynchronous APIs? For example I'm creating a small utility to fetch a web page and parse some data from it. ...
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1answer
141 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 ...
0
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1answer
427 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 ...
0
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1answer
145 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 ...
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2answers
159 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 ...
10
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1answer
4k 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'...
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2answers
409 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....
0
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1answer
195 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 ...
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14answers
12k 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 ...
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2answers
161 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 ...
0
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1answer
576 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 ...
1
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1answer
281 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 ...
4
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2answers
2k 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 ...
31
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2answers
7k 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
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1answer
134 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 ...
2
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3answers
200 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 ...
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1answer
147 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 ...
2
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2answers
765 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 ...
4
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1answer
918 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 ...