Questions tagged [asynchronous]
Asynchronous programming is simply allowing some portions of code to be executed on separate threads. It makes your applications perform better, be more responsive, and use the resources of the system they are running on to the fullest extent.
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Async collection loading for display in WPF/MVVM
In order to improve UX (User Experience) in WPF for huge collections, I would like to load collection items in asynchronnous and staggered fasion. While the WPF UI is virtualized by default, there ...
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Batching calls to server in python with asyncio
I've written this decorator to avoid too many requests to a backend. Did I get it right? Do I need some locks or can I assume some things are atomic / thread safe because this is asyncio?
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Middleware which lets developer maintain dynamic context
Problem Statement: Users can chat while the replies of the chatbot are based on past messages.
So the chatbot needs to have the context of the previous messages and reply accordingly. Here is ...
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Disabling a form button while there's an http request running
I have a form built with react, formik and yup, and this form has some async validations. Apparently, some users were able to bypass these validations, and to prevent some errors, I wanted to disable ...
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Python Async Request using Tor and User-Agent Rotation
The code below will scrape data from three APIs. The APIs are for property listings. So, for each listing, I will have one request. There will be around 20000 requests. That's why I use ayncio to make ...
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Better way than setInterval to wait for an image load?
This is really a simple affair, I just wonder if there is a better way to do it:
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Mixing Async and Sync in same HTTP request ASP.NET Core C#
Is it bad practice to mix async and sync call in same ASP.NET core API call?
For example, in following code method CropBlackBroderOfAnImageAsync is an async method....
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Cleaner Way to Structure Asynchronous Code
The purpose of the code is to allow the user to select directories that will be crawled recursively in order to find particular files or file types to analyze en masse. The thing to bear in mind is ...
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Python AsyncIO pipeline
I wrote a small snippet to implement asyncio Pipeline - object that connects together Layers, and lets them create and pass ...
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Concurrent execution and coordination of C# tasks
I have a class, 'TaskCoordinator' which has 'BaseTask's applied to it.
The BaseTasks have OnStarted, OnFinished and OnCancelled events which are triggered to notify the calling class of their events....
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Synchronous use of Mongo-Scala Driver
The Mongo-Scala Driver (v2.6) currently only supports asynchronous operations, although my use cases often seem to lend themselves well to synchronous reads. This may be to block downstream code ...
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Seekable HTTP response stream wrapper
I created this wrapper to use together with HttpClient streams and ZipArchive. ZipArchive ...
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Node.js async task queue implementation
Here is an async task queue implementation. The idea is to reuse node.js standard library as much as possible.
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Operation cancellation
Brevity is for kings as it requires context and context is for kings. Me.
GitHub and NuGet
How many times you have been writing something like this passing those tedious logger/token parameters?
<...
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Data encryption / decryption on Node.js
I've implemented my first data encryption / decryption methods on Node.js.
Although it might look similar to hundreds of sample implementations available online, I'm curious to get a feedback.
I'm ...
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Chain of CompletableFutures in Java
I am new to this CompletableFuture function in Java. I have the following code below that works fine but looks quite messy IMHO.
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Action queue manager to perform action in a FIFO fashion
Recently, I needed a class that could execute code in a FIFO fashion in order to update parts of a WinForms or WPF UI which did not block the UI Thread and left the UI responsive to any interaction ...
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BindableBase with a throttle
I have project where I'm using BindableBase for my INotifyPropertyChanged implementation. Some of my objects however are ...
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Python task runner with asyncio
I'm trying to a write super simple task runner with asyncio.
Basically, my goal is to run 100 requests to google as tasks, whilst also being be able to handle tasks being added at a later time.
<...
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Blocking requests within Express
Is this the correct way to block requests in Express?
app.js
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Implementing an efficient async FileSystem class based on libuv in C++
I currently am working on a game engine written in C++ with libuv backed for io system calls. I have a FileSystem class that just 'works'. I am allow to read files without blocking but the current ...
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Asynchronous IBAN API with validation
I am working on an iban api which is about saving the iban of some members after (iban validation) in a database. The code is split between Domain (entities, behaviour for iban validation), Database ...
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Example Multiple Async Await Calls Javascript
I need to make an unknown number of api calls, up to 5 max probably. But most samples I've seen show only a couple of async calls so are effectively hard coded to the number of calls being made.
This ...
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Asynchronous Circular Buffer in C#
Preamble
I want to be able to test methods which communicate over a simple exclusively asynchronous two-way stream-like interface which may underneath use any of a number of communication methods (e....
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C++ - simulating Windows' IO completion ports in Linux
This is a simple implementation of IO completion ports in user mode for Linux.
In Windows IO completion ports work like this: There is a global queue for issuing IO requests. Some worker kernel ...
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Optimizing calls for reauthentication by caching tokens and cookies
I am currently developing a REST service in ASP.NET Core 2.2 that acts as a wrapper upon a REST API provided by a reporting solution.
The reporting systems REST API authenticates the user based on a ...
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Async in Railway Oriented Programming in F#
In F# the Railway Oriented Programming pattern can be implemented synchronously using the Result<'t,'terr> type as result value for functions, so they can be ...
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Asynchronous Stripe API and aiohttp parameters formatting
I'm testing the Stripe payment API. I couldn't find a Python wrapper that provides asynchronous requests so I'm writing one. My first goal was to implement the async equivalent of ...
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Implementation of a time lock with Python's asyncio
I have no idea if this kind of lock is called time lock, but I need something for the following scenario: I'm making a lot of concurrent requests with aiohttp, and ...
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C# Tasks for Asynchronous Operations
I currently use the following code to asynchronously create a cimsession to a remote host, query the remote host, return multiple values and finally updated some textboxes on my WPF window. Just ...
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Wrap a callback method in an awaitable method
I'm using a .NET library which uses a pre-async/await type of asynchronicity. That is, it provides asynchronous (non-awaitable) method with a callback parameter.
I'm trying to write awaitable ...
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Performing an action which may return other actions to be performed, concurrently
I have a program which, at its core, involves repeatedly performing an action on some value, and based on that action also returning a list of new values to perform that action on. The pure version of ...
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Static site generator using JavaScript Promises
I have created a small static site generator (for learning purposes) in Javascript ES6, using Promises, but I am not certain of how to use them well. The code below works fine, but I wonder if i can't ...
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C# asynchronous notification vector v2
As a result of my previous post, I have implemented / refactored my code and have started making successful use of my class. However I have come across a couple of new questions:
The observer must ...
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multiple AJAX requests and multiple SetTimeout animations
I wrote a piece of code that included multiple AJAX requests and multiple SetTimeout animations.
I want the code to perform better, especially the SetTimeout sections.
which part of the code should ...
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Node/Express authenticate Google email address
Trying to set up express server that will authenticate a user's Google email before proceeding.
The code below works, but is there any way to make it more elegant?
The whole ...
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Putting a Queue Between HTTP Request/Response
We currently have two legacy systems: the Consumer and the Worker. These systems are massively complex in ways that are not important to this review, but it is enough to say that a large-scale re-...
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Python server that performs sentiment analysis on Twitter data
I have a fully working Python server that utilizes Tornado, asyncio, websockets and tweepy(Twitter's Streaming api). The main point of this server is to receive a query from the user, call upon tweepy ...
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REST API request automation [closed]
I created a class to automate some requests for an API. Can I improve this code in any way?
The code itself is very simple and easy to understand.
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C# asynchronous notification vector
The purpose of this class is to efficiently notify another thread when data is available with minimal blocking to access/pass the data. The data reader/producer thread processes data in bulk which ...
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Let Them Eat Lists, Eventually (Asynchronous Generic List Consumption with Spring and CompletableFuture)
I want to reduce some repeated code in my Java 1.8/Spring Boot application, and to that end I tried to make a reuseable asynchronous utility module. In essence its an async List.forEach that takes a ...
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Parallel FTP client
I was given the task to download files for a FTP server. The download should be fairly fast. 15 parallel connections can be used.
I have used FluentFTP as the ...
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Asynchronous wrapper for database connection
I'm using a database that has a library for access to it. Connection is done synchronously, it's blocking and I do not have a way to abort it. To connect, I have to write:
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C# Handling Task Cancellations/Timeouts and Exceptions [closed]
I am very new to Tasks and therefore new to handling task cancellations and task exceptions.
I wrote this method that gets a List which is then used to populate an ObsservableCollection shown in a ...
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Asynchronous retrieval of WebExtension browser history visits
I'm writing a small class that wraps the existing functionality of browser.history.search in Firefox's WebExtensions API. The current API only directly searches for ...
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C# Async/Await networking server
I made a simple async networking server and I'd like to get some input on the code, whether things can be done better and whether the code is stable (able to hold more than 1000 connections without ...
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Async SelectMany implementation
Async SelectMany takes an enumeration (length unknown) of tasks, each of which returns another enumeration (length unknown and likely different from one another), and returns results from the second ...
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Upload a file asynchronously
I need your opinion about my practice. I want to improve it.
The requirements are the following:
RESTFUL + OWIN (SelfHosted)
Endpoint - Upload a file asynchronously
Make a request to the endpoint ...
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Aggregate sensor readings from multiple sources
I've developed a toy example to investigate how async works in C#. Though I've learned a lot this week, I'm still unsure of the finer details, as this is my first C#...
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