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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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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Downloading multiple urls with aiohttp Python 3
I am trying to use aiohttp library in python to download information from url. I have about 300 000 urls. They are saved in file "my_file.txt". When I get web page, I extract pairs of a question and ...
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Processing a company list in which every element is an employee list
Now, there is a company list in which an element is an employee list in every company. I calculate the salary of employees in every company with a RESTful API one by one,. This is very slow, so I join ...
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A syslog to Azure Log Analytics forwarder
I am using this code to forward my syslog logs (converted to json using syslog-ng) to Azure Log Analytics on an ARM board (since there is no official client for ARM)...
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Await socket Response
I wrote this to make the "callback hell" more manageable on the part of the coder when using Socket IO, so that there wasn't really any callback hell to go with, just a simple await.
This should work ...
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Initializing multiple variables with different types using parallel calls
Consider the pattern below, where multiple async calls are made in parallel:
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Search for rows in a 2D array that contain a given sequence
I have a 2d array of m * n dimension (m and n can vary from 1 to 100000). The following snippet of code checks if the sequence exists in the row and stores the index if it exists. The time taken by ...
user180762
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Templatized GLib asynchronous queue
I'm working on a legacy C++ project, which is using GLib for its Main Event Loop. This has caused a lot of ugliness because it mixes C++ and C paradigms (no C++ wrapper for GLib had been used).
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Monitor asynchronous tasks, tracking their running times
Scenario: I'm getting requests through a (thread-safe) queue. Each request then needs to be handled in a separate thread. There is a chance that the function (which is actually calling a Java-program ...
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Collecting folly::Futures with an associated value
I'm trying to implement a batch API where requests are associated with an id. In the batch response, the individual success/failure responses should be associated to their corresponding request id.
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Error handling for a simple 'fetch some data, then save the data' Node function
This is a fairly simple bit of code:
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Python (Sanic) Routing
I wanted to explore how I can associate routes with "controllers" with Sanic as a base. It works fine but "feels" a bit clunky but I can't put my finger on why/how.
routes.py - Returning controller ...
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Custom TaskScheduler: Limited concurrency level [closed]
I'm interested in some feedback for a custom TaskScheduler implementation I wrote today for use on a game server - I wanted to be able to have a single-threaded ...
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Await in... VBA?
Asynchronous programming is tricky enough already, and VBA doesn't make life any easier. I wanted to create some basic functionality to allow async processes to mark completion without having to ...
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AppTaskWorker - Running class methods at sporadic intervals
I decided to write a class to do this for me. I had a lot of methods that needed to be invoked at sporadic intervals, across multiple projects.
The dictionary will eventually be class methods, I ...
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Asyncio HTTP Request Queue
I wrote a simple sitemap.xml checker using asyncio and aiohttp. I followed the documentation demonstrating the producer/consumer pattern. However, I noticed that as the URLs scale larger, it seems to ...
user176168
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Async Queue implementation without locking
I wrote a quick implementation of an async queue that utilizes a backing ConcurrentQueue. It was pretty much based on an implementation given in this Stack Overflow ...
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Scraping urls asynchronous including exception handling
I'm trying to understand how to work with aiohttp and asyncio. The code below retrieves all websites in ...
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Async/Await Computation Expression
When writing asynchronous code in F#, one often needs to call methods in the .NET BCL that return Task or Task<T> rather ...
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Starting a process asynchronous
For executing a Process I've created an separate class which binds the possibilities together, for example reading output, start as Admin, catch Exceptions and also start all this asynchronous.
Are ...
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Status dispatching of my redux-thunk async action (post request)
I'm trying to dispatch to my reducers the current status of my request.
So far I'm wondering how refined the status publishing of my thunk action.
I feel like my code is very verbose and I wonder ...
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Concurrent fire and forget async task queue
I had to do a lot of IO stuff on my server running Node JS where I did not really care about the result of the operations. The list of incoming tasks could be huge, so I had to limit the number of ...
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Async friendly Timer
I'm trying to implement a Timer that schedule an async action with the following requirements:
thread safe
only one action should be running at any given time (period countdown should start when the ...
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Async Task using RxJava2 in Android
I have tried to create the async task using the RxJAVA2. The code is working fine. WHat enhancement can I do in this code?
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TextFileConvert - dos2ux and ux2dos in VB.NET
This provides text file conversion capabilities like the common Unix utilities "ux2dos" and "dos2ux".
I needed the capability to perform Unix text file conversions, round trip, within a VB.NET ...
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An asynchronous solution to send validation email [closed]
I intend to send validating message to User's email to complete a registration with the following codes:
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Validating a collection of proxy servers with maximum possible throughput
I am validating a collection of proxy servers and trying to achieve the maximum possible throughput. I've tested a few different methods, such as Task.WhenAll, TPL ...
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Issue tokens concurrently with synchronization per client
I have an API application with token authorization. A token is valid for one hour. Each business client has its own instance of the API application:
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Non-blocking C++ sockets [closed]
I'm trying to use sockets to create a simple client and server architecture and I'm wondering if there is any other way to create non-blocking, 'async' sockets instead using ...
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Deal with partial messages using SocketAsyncEventArgs
As you know, when dealing with SocketAsyncEventArgs, this is possible to receive partial messages and depending on the protocol used, you have to deal with it. In ...
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Accumulate ids to make a single ajax request
I have multiple places where I need to make ajax requests to fetch the items corresponding to some ids. However, I only want to make a single request by accumulating these ids and debouncing the ...
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Handling a single connection to a server or client
I'm writing an asynchronous TCP server and client for a game in C# and in particular getting sending right is a bit tricky because calling BeginSend() before ...
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ListBox async filtering, cancelling previous task on filter update
I'm trying to come up with a nice way of filtering a ListBox asynchronously, to keep the UI responsive. The filtering gets fired off asynchronously each time the ...
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Simple concurrency implemented in Python
Purpose of the question: learn more about ways to implement concurrency in Python / experimenting.
Context: I want to count all of the words in all of the files that match a particular pattern. The ...
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PauseOrCancelTokenSource
I added this implementation of PauseToken and PauseTokenSource to my project from this MSDN blog post: Cooperatively pausing async methods
Since I will usually be passing in both a PauseToken and a ...
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Making 10000 HTTP requests as fast as possible
I need a program that needs to gather data from large list of API end points. Below is a mock-up program that attempts to make 10000 requests as fast as possible. Any suggestions on how to improve on ...
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Testing validity of Proxy servers concurrently
I am trying to test the validity of a few thousand public proxy servers quickly. To do this, I am sending web requests using each proxy to a website such as example.com, and checking that no errors ...
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Async File Input
I recently started work on my own Async file input "library" in C++. I got it done today and I decided to put it on Code Review to see how well I actually did, and where I can still improve the code.
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Asynchronous file upload to disk
I have a simple webserver written in Python using aiohttp. My goal is a server that can receive many file uploads simultaneously and stream them all to disk. This ...
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Executing asynchronous functions in sequence
I implemented a function for practice that takes a collection of asynchronous functions and a callback. It executes the functions in sequence then calls
the callback with the results (coming from the ...
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Asynchronous File System Abstraction
As a side-project, I'm trying to implement a distributed object storage. I've decided to use C++ and libuv, two technologies I had never played with, since it gave me a good reason to learn them.
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Scraping with asyncio/aiohttp and retrying the request on error
I am doing some practicing with back-connect proxies and asyncio/aiohttp. The IP changes on every request to the proxy and I am allowed up to 1500 threads. The big issue with back-connect proxies, is ...
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Minimalist dynamic task scheduler
Dynamic execution policy did not make the cut for C++17. Submitted for your criticism, a minimalist dynamic task scheduler to use until the std::async sorts it out...
I am interested not only in ...
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Asynchronous Queue
implemented a basic Asynchronous Queue so, that I can do
await queue.push(item);
const item = await queue.pop();
basically I'm trying to convert a synchronous ...
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Asynchronous Stack
implemented a basic asynchronous stack so, that I can do.
await stack.push(item);
const item = await stack.pop();
basically I'm registering listeners when ever i'...
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Testing whether pages can be fetched from two ports
I have an endpoint in my API which does a port test on 4455 and 4456 once a client GET's it. This is accomplished by requesting two web pages. The result will respond to the client with a JSON object:
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Fetching user details, posts, and comments using promises in ExpressJS
I'm creating an API service in NodeJS using Express (version 4) Framework. Created an MVC architecture for the same (no views, only model, and controller as this is an API).
Also, there are routes. ...
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Executing multiple async methods synchronously without throwing
I have a following task: execute multiple asynchronous methods synchronously and always execute them all, even when one of them throws. Rethrow thrown exceptions if any occured only after all tasks ...
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Chaining three promises in Angular.JS
I have demonstrated promise chaining where promise's p1,p2,p3 has to be resolved synchronously.
The code below is using angular.js 1, and here P3 is resolved then P2 and then P1.
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