Questions tagged [asynchronous-programming]

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1answer
337 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 ...
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2answers
132 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 ...
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1answer
111 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 ...
0
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1answer
142 views

How do I not lose the “reactive” nature of my services, simply because one of the services isn't reactive?

I've lately been very interested in reactive microservice design with streaming and event-driven architectures. When one writes (i.e., manages) services, this paradigm works extremely well by simply ...
28
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3answers
24k views

How does Javascript code become asynchronous when using callbacks?

I've been doing a lot of reading online trying to figure out how to write asynchronous JavaScript code. One of the techniques that has come up a lot in my research is to use callbacks. While I ...
2
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2answers
55 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. ...
1
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1answer
59 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
40 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, ...
5
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2answers
448 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,...
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0answers
75 views

Domain driven design and asynchronous code (repository)

I am trying to write domain code and I am pretty happy with my architecture so far. Problem started at point when I needed to create different implementation of repository, that required asynchronous ...
0
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1answer
75 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 ...
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1answer
118 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 ...
3
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1answer
124 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, ...
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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 ...
2
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3answers
568 views

Transitioning to asynchronous programming model

Our team is mantaining and developing a .NET web service written in C#. We have stress tested the web service's farm and we have evidence that the actual architecture doesn't scale well, as the number ...
5
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1answer
4k views

Does omitting await keyword once in the call stack break the asynchronous behavior of the whole stack?

Call stack may contain several methods returning Task. If all of them are decorated with async, the flow of execution is quite simple. However, what if one of them is not awaited - are other method ...
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0answers
29 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
128 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 ...
29
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13answers
11k 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 ...
3
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3answers
800 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
137 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
200 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
85 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
87 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 ...
8
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1answer
2k 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
4k 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 ...
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2answers
106 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....
3
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1answer
132 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 ...
0
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1answer
175 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 ...
-4
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2answers
86 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 ...
1
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1answer
195 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 ...
7
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1answer
426 views

API design: stream objects vs. functions vs. messages

I'm designing API for a python library that accepts asynchronous input and produces the asynchronous output: various signals come in, and various signals are generated in response (there's no one-to-...
18
votes
3answers
38k views

Calling multiple async services in parallel

I have few async REST services which are not dependent on each other. That is while "awaiting" a response from Service1, I can call Service2, Service3 and so on. For example, refer below code: var ...
3
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2answers
702 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 ...
2
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3answers
158 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 ...
29
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4answers
21k views

async+await == sync?

Stumbled upon this post that talks about making async web requests. Now simplicity aside, if in real world, all you do is make an async request and wait for it in the very next line, isn't that the ...
3
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2answers
2k views

Combining asynchronous and synchronous programming

I've got trouble wrapping my head around a certain problem: In my data-flow app (a visual editor), I have both autonomous objects which communicate though ports via unordered simultaneous messages ...
1
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1answer
134 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
498 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 ...
3
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1answer
911 views

Using and designing asynchronous APIs with naturally synchronous parts

I've been programming for a long time, but very rarely with anything asynchronous (and not often with anything to do with multithreading, either). Mostly for the fun of it, I'm writing a program to ...
21
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1answer
9k views

Does Akka obsolesce JMS/AMQP message brokers? [closed]

I spent the last week deep diving into the Akka docs and finally understand what actor systems are, and the problems that they solve. My understanding (and experience with) traditional JMS/AMQP ...
17
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3answers
5k views

API Gateway (REST) + Event-Driven Microservices

I have a bunch of microservices whose functionality I expose through a REST API according to the API Gateway pattern. As these microservices are Spring Boot applications, I am using Spring AMQP to ...
3
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1answer
691 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 ...
6
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1answer
1k views

Functional programming pattern for async JavaScript code

I have adopted a pattern in one of my projects that I really like and I suspect it's likely to be something standard. I'd like to describe it here and see if you guys can tell me how other ...
96
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1answer
61k views

Is there really a fundamental difference between callbacks and Promises?

When doing single-threaded asynchronous programming, there are two main techniques that I'm familiar with. The most common one is using callbacks. That means passing to the function that acts ...
0
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1answer
1k views

How to avoid synchronous communication between microservices

Let's say we're talking about a webshop. Microservice 1: Manages products and their prices Microservice 2: Responsible for payment and checkout. If a user wants to pay for a product, the payment ...
0
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1answer
740 views

Is the logic behind `Asyncio.wait()` and async/await, the same, just the code is written differently (syntax)?

I'm learning Python, more specially parallel programming using Python Parallel Programming Cookbook by Giancarlo Zaccone. At the time the book was published async/await was still in the beta version ...
3
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2answers
915 views

CQRS async query from command handler

In a CQRS/async microservices context, I have a command handler e.g. SendOrderConfirmationEmailCommandHandler implemented in a communications service. This depends on information from the orders ...
0
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2answers
757 views

When to check if the user is logged in?

I have an app with an optional login where some functionality requires the user to login. When checking if the user is logged in I use a framework that runs an async function that requests an access ...
3
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1answer
156 views

Design for avoiding concurrent calls to an interface implementation

The application I'm developing requires that some data is obtained through different channels. As this is a network process, I have decided to use async programming. I have designed the following ...