Questions tagged [asynchronous-programming]
The asynchronous-programming tag has no summary.
185 questions
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Best way to add asynchronous execution for already implemented synchronous process
I have a complex process implemented in Java Spring microservice.
Currently this process is triggered on user request and it is synchronously executed.
This often results in a gateway timeout.
...
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6
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584
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How is async implemented natively?
How is async logic implemented natively without threads? What would be the high level structure of the system?
Is it just a separate OS thread that gets and pushes requests and results in 2 queues?
I ...
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Expensive constructors. Should they exist? Should they be replaced?
Suppose I have a constructor that performs an expensive IO operation that takes a noticeable amount of time. I don't like it for a few reasons (first of all, it's simply wrong, but there are practical ...
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What does it mean to be "truly" asynchronous?
Reading the Proactor pattern paper, specifically this part:
I/O Completion Ports in Windows NT: The Windows NT operating system implements the Proactor pattern. Various Asynchronous Operations such ...
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Not await an asynchronous method because it is like an endless loop - good practice?
I inherited a piece of software. This program is connected to an external hardware, which is a measurement device. Every 100 milliseconds, a value is read from this device and displayed to the user. ...
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How can I code synchronous programs in Node?
I'm a career programmer, very comfortable writing programs in Python, and recently started learning Node.
I understand the asynchronous features are useful in many situations, but when I debug my code,...
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5
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336
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Purpose of async/await in web servers when stuck with legacy I/O
A couple days ago I asked about the Purpose of async/await in web servers, and got in-depth answers explaining how in fully asynchronous code, it frees up the CPU completely while also releasing the ...
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Purpose of async/await in web servers
I don't understand why I keep seeing async/await recommended (or sometimes, even enforced) for ASP.NET Core web applications and APIs.
As far as I can tell, every request is already being run on a ...
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142
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In Java's Fork/Join is the operation for combining results limited to addition?
As I understand it, the join() method merge/composes/combines the results from all subtasks. A simple example I saw was summing the numbers from 1 to N and the subtasks would simply sum a range of ...
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519
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How to structure your Python code with asynchronous and synchronous parts
I have a Python FastAPI server application which naturally guides you towards the asynchronous paradigm.
For legacy reasons, I have to support two backends, one which is purely synchronous and one ...
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132
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Return function after kicking off background process
I have a process in golang that I want to kickoff through a RPC call but then have the function return early whilst the process continues in the background. Specifically it’s just a basic db transfer ...
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754
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What is the best way to retain a local object which is performing an asynchronous task?
My problem is the following: inside a method I'm creating an object like this:
MyObject* myObject = [MyObject new];
Then I want it to perform an asynchronous task like this:
[myObject ...
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56
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How to handle multi-region writes for a joint user registration?
UserA and UserB are signing up for some joint service together. They both have to independently agree to T&Cs before sign-up is complete. Once complete they both receive an email to sign-in.
A 1 ...
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292
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If you run a function in a different thread, but you wait for it to finish in your main thread, is that function asynchronous?
Backstory
Probably a stupid question, but I just have a sneaking suspicion that "asynchronous" is the wrong terminology to us for naming my template function here:
template <class T>
...
- 3,649
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122
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How are asynchoronous problems handled with imperative programming?
Context
To level set, I've been working with OOP and FP for my whole career, so my experience with the imperative paradigm is limited. The team I joined is made up of very senior (20+ years xp) ...
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Synchronous vs Asynchronous Event Driven Architecture
I have been searching extensively about the difference between synchronous and asynchronous patterns and how this relates to event driven architecture. On its face it is quite obvious, I simply ...
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What is a right way to handle requests?
A social network has API, but also it has some limitations like the amount of requests that can be done in one second (let's say API will give an error, if it accepts more than 3 requests per second)
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Is calling a completion handler synchronously an anti-pattern?
I have a function that performs a task which can either be performed immediately and without any blocking or it can only be performed after some delay. The caller of that function shouldn't need to ...
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Why is there a shift towards asynchronous and event driven programming?
My question will be mostly about Linux and contemporary X86 hardware.
Clarifying the terms
async event based programming: spawning fixed amount of threads and using some user space scheduling ...
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423
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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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447
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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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472
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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?
2
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3
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2k
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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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239
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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 ...
- 179
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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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288
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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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3
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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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477
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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 ...
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342
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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 ...
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391
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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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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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221
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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 ...
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390
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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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519
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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 ...
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570
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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 ...
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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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1
answer
347
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 ...
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256
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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 ...
- 337
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149
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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, ...
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873
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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 ...
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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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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 ...
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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, ...
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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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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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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,...
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922
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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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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 (...
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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 ...
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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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