Questions tagged [async-await]
This covers the asynchronous programming model supported by various programming languages, using the async and await keywords.
5
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1answer
94 views
Async concurrency prevention class
Because I'm quite naive regarding C#'s Task Asynchronous Programming and concurrency in general, and because it's so difficult to test, I'm concerned about the safety of this code. It's likely that ...
5
votes
1answer
166 views
Scraping an parsing jockeys data using Task.Run
I started to have HUGE doubts regarding my code and I need some advice from more experienced programmers and architects.
On the button click, the application runs a method, that is running a ...
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0answers
11 views
DB2 monitor using idb-connector
Monitors DB2 for changes in table data. It doesn't take any actions with the data just yet, only checks to see if new data is available every 2 seconds.
...
5
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0answers
45 views
SQS subscriber pattern in background service
I have the below code to pull messages from a FIFO SQS queue. Using the while (IsRunning) loop makes me feel to question the code design. Is there a pattern I am ...
5
votes
2answers
100 views
Tcp server messenger awaiter in f#
Hi I have a simple tcp server, and that server receives messages with specific length so basically i need to wait for TcpClient to fill buffer with that amount of data, and it works.
But I am not ...
4
votes
0answers
50 views
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 ...
4
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0answers
85 views
Toggle any application feature ON or OFF
When testing or debugging applications it'd be often useful to be able to run it without certain features like committing things to the database, saving files, sending emails, reading files, executing ...
6
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0answers
50 views
Simple integration of async and tkinter in Python
I've been a fan of coroutines and asynchronous programming for a while, and I recently took a trip down memory lane to when I was using Python's tkinter module for ...
3
votes
2answers
113 views
Named Semaphore with async calls
I have multiple distinct processes that need to access external resources that are rate limited. The processes are all async in nature and run in different applications. In times past I would just ...
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0answers
77 views
Implicit Async and none async event handlers
I have implemented a event aggregator for our backend.
...
2
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0answers
47 views
Communication with interactive program using ChildProcess
There is an interactive program, namely Microchip Debugger (Later called MDB), which I want to communicate with from NodeJS program. You can think about it as any console-based debugger - they all do ...
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vote
0answers
35 views
Implementing Async ExecuteNonQuery() for IDBCommand vs SqlCommand.ExecuteNonQueryAsync [closed]
I'm using IDBCommand for my database layer in order to switch to other database providers than SqlDataProvider.
...
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vote
0answers
70 views
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-...
4
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0answers
138 views
Safely executing background tasks in parallel in ASP.NET Core
Context and initial idea
I'm trying to teach myself the CQRS and Event Sourcing patterns by developing a simple ASP.NET Core application, loosely following Greg Young's example CQRS implementation on ...
3
votes
1answer
48 views
Separating Fetch Calls and using in Promise Chain
I´m currently working on a small microservice application, which will in it´s simplest form just receive a Request from a Formular and and based on containing information perform several other Server-...
1
vote
3answers
81 views
Class constructor with async properties set from poke-api
So, this is for a clicker game I'm trying to build with Pokémon data drawn from the PokéAPI. Since I'm using Vue.js for the project, ...
0
votes
1answer
32 views
Displaying multiple objects on map and calculating distances using google api
I am quite new to Javascript. For a school project we wrote a website that displays the user's location on a google map alongside with some objects such as vehicles or passengers.
I rewrote my code ...
1
vote
1answer
147 views
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 ...
2
votes
0answers
67 views
Scheduler built with observables v3 (follow-up) - now testable
This is a 2nd follow-up to my previous one about a Scheduler built with observables.
Although the last one was working correctly, it was only possible to see this ...
3
votes
1answer
35 views
JavaScript that deletes everything inside a folder on Box.com
I just finished a simple script for Node that will delete all the folders and files inside a specified folder ID through Box's API. It works by getting a list of items inside a folder, then generating ...
1
vote
2answers
76 views
Get an array of currency exchange prices based on asset
Function getMarkets
Makes a call to get Cryptocurrency Exchange data based on asset (USD, USDC, USDT)
It calls the endpoint 3 times to return 3 arrays which are then returned to the callee.
I have ...
2
votes
1answer
68 views
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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vote
0answers
191 views
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 ...
3
votes
0answers
170 views
TCP client reading socket asynchronously
I'm relatively new to .Net/UWP networking and have been trying to make sense of the APIs. I'd like to implement a TCP client that is capable of reading and sending messages independently (there is no ...
0
votes
0answers
57 views
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#...
0
votes
1answer
50 views
Enforcing C# Task to exist only once at any given point of time for a given ID
There were multiple times in different applications that I needed to accomplish the following behavior with C# Task and I did it in a certain way, and would like to ...
2
votes
0answers
33 views
Porting python's 'with' construct to TypeScript
Now that async generators are available in the platforms I care about, I figured I'd try porting Python's ingenious with construct to JS as a utility. My first stab ...
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vote
0answers
119 views
Using up to 15 connections to synchronize files from a FTP server with local files
Task: Create a service which will synchronize files on FTP server with files on local drive.
FTP server allows up to 15 concurent connections
Synchronize the files as fast as possible
Files on FTP ...
2
votes
0answers
222 views
MVVM Databinding, Commands, Async - MVVM.Light [closed]
I'm new to C#, WPF and MVVM and I don't want to make common mistakes right from the beginning and get used to them. I already read some similar questions on best practices for WPF/MVVM but none of ...
2
votes
1answer
56 views
Generic Cache-Aware Data Adapter
I've written a generic data adapter that can make use of a cache, for use in a data access layer. It presents an interface allowing CRUD operations, as well as retrieving all objects of a certain type....
2
votes
1answer
58 views
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 ...
3
votes
0answers
703 views
Sending notifications with Django channels
I have project on Django wich use Django Channels. I use Django Channel for sending notifications to users who are subscribed to articles changes (adding/editing/deleting comments on article).
So I'...
2
votes
1answer
42 views
Chart of answered CR posts percentages over time - Part 2
I created a graph to show the change in the percentage of questions answered over time and the first version fetched data from chat transcripts using PHP. The sub-domain I have registered for my ...
0
votes
1answer
45 views
2
votes
1answer
276 views
Executing query until there is nothing more left
I often query a database to get a batch of items to procees. I do this as long as the query returns some items. I use this pattern quite a lot so I thought I create a small helper so that I don't have ...
1
vote
1answer
1k views
Extension method to to run any async method synchronously
Sometimes I need to call async code from a synchronous method. This leads to repetition in code to wait for the task to complete, then ensure that the expected ...
2
votes
0answers
47 views
Conditional AsyncLock implementation
I have a case where I match data from DB by the various filters. Until the match is updated in the DB, I don't want to accept requests for matching with the same criteria, as this could produce ...
3
votes
2answers
98 views
Streaming modified lines of a file from a Controller
I am writing a piece of software that aims at streaming the modified lines of an external file located at given uri (and retrieved as a QueryString parameter).
I am trying to minimize the impact of ...
2
votes
1answer
75 views
Simple but important function to check and retry given action's result
What I'm trying to achieve is
Given a predicate function and an action which returns the object to check,
check predicate, retry and fail after numTries .. or success .
Purpose of this function ...
-1
votes
1answer
42 views
#Error Handling- Propagating errors to calling function.
Im new to javascript programming and i am required to make a web app. Node.js will be used as the js runtime environment. In order to minimize the amount of time needed for debugging as the app ...
4
votes
2answers
128 views
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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vote
0answers
52 views
Async API Function with Mongoose
I'm quite new to the language and I just started using async/await. I've written this function for an API that I'm developing. It checks what is sent by the user, specially the status that he wants to ...
2
votes
1answer
51 views
Javascript class to geocode Dutch addresses
I am relatively new to javascript ES6, the code I've written is working fine. However I am curious if this would be the best approach. I am trying to write a reusable module that I can use in multiple ...
5
votes
2answers
1k views
ForEachAsync extension method (a way to run an async operation on each item of a sequence in parallel)
In a recent project I worked on we faced some issues due to an excess of parallelization (thousands of threads were created and the overall result was a degradation of performance and several spikes ...
2
votes
0answers
209 views
React widget to display, sort and search remote data
I've created a React widget that pulls data on crypto-token pairs from a remote API and makes that data sortable by headers and searchable.
You can view a demo of it here.
Is this a maintainable way ...
0
votes
1answer
171 views
Asynchronously fetching data from the database
The following C# code is written to fetch the Categories data from SQL Server Database using Asynchronous Task for HttpGet. The Dapper library is used as ORM.
I ...
4
votes
0answers
74 views
pool of python coroutines
Task
control how much coroutines are running simultaneously with ability to stop the process from inside.
Use case
when scraping websites you want to control how much memory program consumes and ...
0
votes
0answers
106 views
An `async..await` based way to handle the output of a child process
I've recently answered a question on Stack Overflow where the asker was wondering how to read from the standard out of a child process he was spawning inside a ...
4
votes
1answer
80 views
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 ...
2
votes
0answers
155 views
Server app: pinging up to 500 clients asynchronyosly
TCP/IP server which controls up to 500 clients. There's a list of added computers and the server gets this list, selects computers which are not already connected and ping them using host name.
...
