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22
votes
5answers
3k views

Asynchronous Programming in Functional Languages

I'm mostly a C/C++ programmer, which means that the majority of my experience is with procedural and object-oriented paradigms. However, as many C++ programmers are aware, C++ has shifted in emphasis ...
20
votes
3answers
9k views

What determines which Javascript functions are blocking vs non-blocking?

I have been doing web-based Javascript (vanilla JS, jQuery, Backbone, etc.) for a few years now, and recently I've been doing some work with Node.js. It took me a while to get the hang of ...
19
votes
5answers
3k views

At what point is asynchronous reading of disk I/O more efficient than synchronous?

Assuming there is some bit of code that reads files for multiple consumers, and the files are of any arbitrary size: At what size does it become more efficient to read the file asynchronously? Or to ...
16
votes
3answers
8k views

How will C# 5 async support help UI thread synchronization issues?

I heard somewhere that C# 5 async-await will be so awesome that you will not have to worry about doing this: if (InvokeRequired) { BeginInvoke(...); return; } // do your stuff here It looks ...
15
votes
6answers
2k views

Solutions to C# 5 async re-entrancy

So, something's been bugging me about the new async support in C# 5: The user presses a button which starts an async operation. The call returns immediately and the message pump starts running again ...
15
votes
3answers
731 views

How can I diagnose async/await deadlocks?

I am working with a new codebase that makes heavy use of async/await. Most of the people on my team are also fairly new to async/await. We generally tend to hold to Best Practices as Specified by ...
14
votes
3answers
10k views

BackgroundWorker vs. Async/Await

I am new to C# development and wish to create a more responsive UI. In my preliminary research, I have seen two methods for achieving this: Multi-threading in conjunction with the BackgroundWorker ...
13
votes
1answer
4k views

How can NodeJS be “non-blocking”?

I'm learning NodeJS and just wanted to clarify something. In several introductory tutorials and books so far, very early on they've described Node's "non-blocking" architecture - or rather that it's ...
10
votes
2answers
614 views

Why does C# allow you to make an override async?

In C#, when you override a method, it is permitted to make the override async when the original method was not. This seems like poor form. The example that brought me to this was this — I was ...
10
votes
4answers
3k views

How do you keep code with continuations/callbacks readable?

Summary: Are there some well-established best-practice patterns that I can follow to keep my code readable in spite of using asynchronous code and callbacks? I'm using a JavaScript library that ...
9
votes
2answers
24k views

When should I use StringBuilder or StringBuffer?

In a production web application, my fellow programmers used StringBuffer everywhere. Now I am taking care of application development and corrections. After reading StringBuilder and StringBuffer I ...
9
votes
3answers
2k views

Choosing a JavaScript Asynch-Loader [closed]

I’ve been looking at various asynchronous resource-loaders and I’m not sure which one to use yet. Where I work we have disparate group-efforts whose class-modules may use different versions of jQuery ...
9
votes
1answer
613 views

Futures/Monads vs Events

In an application framework when performance impact can be ignored (10-20 events per second at max), what is more maintainable and flexible to use as a preferred medium for communication between ...
8
votes
2answers
2k views

Best practices when managing long running asynchronous jobs

I am in the design phase of a project where the end user will submit a request from a web page that will spawn a long running asynchronous processed job. Is there a "best practice" for this problem? ...
6
votes
1answer
1k views

Designing interfaces and async

Suppose I have created interface IFolderRepository with methods like that: IEnumerable<Folder> GetAllFolders(); Folder GetFolderWithId(int id); void AddFolder(Folder newFolder); void ...
6
votes
1answer
956 views

Blurring the lines between async and regular functions in C# 5.0

Lately I can't seem to get enough of the amazing async-await pattern of C# 5.0. Where have you been all my life? I'm absolutely thrilled with the simple syntax, but I'm having one small difficulty. ...
6
votes
1answer
165 views

Readiness vs. Completion Async IO Memory usage?

I was watching this talk about implementing Async IO in Rust and Carl mentions two potential models. Readiness and Completion. Readiness Model: you tell the kernel you want to read from a socket do ...
6
votes
1answer
239 views

Asynchronously returning a hierarchal data using .NET TPL… what should my return object “look” like?

I want to use the .NET TPL to asynchronously do a DIR /S and search each subdirectory on a hard drive, and want to search for a word in each file... what should my API look like? In this scenario I ...
5
votes
1answer
7k views

Async Controllers in ASP.NET MVC: Real Advantages / How Achieved?

I have been working through an article about asynchronous controller methods in ASP.NET MVC (http://visualstudiomagazine.com/articles/2013/07/23/async-actions-in-aspnet-mvc-4.aspx) and I think I may ...
5
votes
1answer
458 views

Cross-process asynchronous messages in .NET

(Asking this here instead of SO because I don't even know what technology to tag it with :)) My team is about to embark on a project to convert a large part of our code base to use asynchronous file ...
5
votes
2answers
715 views

How can I design an efficient moderation system for comments?

Here's the job I want to do: My project is a website where there will be a lot of comments. Those comments will be moderated: a moderator will connect, see comments and accept or refuse them. I need ...
5
votes
1answer
390 views

What are the benefits of Android way of “saving memory” - explicitly passing Context objects everywhere?

Turned out, this question is not easy to formulate for me, but let's try. In Android, pretty much any UI object depends on a Context, and has defined lifetime. Android can also destroy and recreate UI ...
4
votes
1answer
98 views

How do async action methods maintain their network connnection?

In ASP.Net MVC, the classic (synchronous) way to write an action method is to return ActionResult. More recently, the ability to perform action methods asynchronously was added, by allowing action ...
4
votes
1answer
473 views

C# async/await: Pedantry vs. the Debugger

I'm playing around with async and await, and they seem pretty intuitive, but some of the things I'm reading about these keywords doesn't make sense to me. In fact, some of it seems to me to be ...
4
votes
2answers
5k views

How do you work with Asynchronous functions, recursively?

I am currently working on FLEX and have to call a web services. once I have the result, I have to call the web service again, with the previous result as the input. A compounding problem, is that ...
4
votes
2answers
1k views

How do you decide to Queue/Dispatch events Sync or Async? (in Observer Pattern)

Consider the following elements in an event-driven architecture: Observable Object Event Dispatcher Observer(Listener) Now, we have two messages: From Observable Object to Event Dispatcher From ...
4
votes
1answer
194 views

Asynchronous update design/interaction patterns

These days many apps support asynchronous updates. For example, if you're looking at a list of widgets and you delete one of them then rather than wait for the roundtrip to the server, the app can ...
3
votes
4answers
656 views

Where was “async” all these days? [closed]

It was started with C# 5's new keyword "async". And now I see this async programming everywhere from Javascript to C++, mostly from Microsoft. And from various discussions I came to know, this is a ...
3
votes
1answer
923 views

Implementation of Asynchronous function call in C

I took it upon myself recently to work towards making a general-purpose Translator to automatically translate js programs into C, but I got stuck when thinking of asynchronous behaviour. Using ANSI / ...
3
votes
1answer
446 views

using blocking APIs with non-blocking server

We are using Tornado for our system (behind nginx) -- and everything is working fine. Now we need to integrate a client lib (for Neo4j Graph DB) into our system. The problem is that it is blocking. ...
3
votes
3answers
650 views

What is meant by XML/XSLT/XPath and asynchronous programming?

I understand that (1) XML/XSLT/XPath and (2) asynchronous programming may not be related to one another. My questions are: When a C# developer job is advertised saying: "the following skill is ...
3
votes
1answer
591 views

when is it necessary or when should a controller be async

When is it absolutely necessary for a controller to be async? Should all controllers be async or is it bad practice to make all of them async unless it is necessary. Just looking for some general ...
3
votes
3answers
3k views

How to optimize calls to multiple APIs at once and return as one set?

I have a web app that searches across 2 APIs right now. I have my own Restful web service that I call, and it does all the work on the backend to asynchronously call the 2 APIs and concatenate them ...
3
votes
5answers
634 views

Why can't a server continue to act on a request after sending the response?

Say for example I've got a RESTful webservice, and I need to support creating a widget via a POSTed http request. I need to Deserialize the POSTed widget. Validate the deserialized widget. Persist ...
3
votes
2answers
778 views

Converting event-based asynchrony to C#5 async

We currently have an interface for an asynchronous video decoder that runs on its own thread. Basically you feed it some data and it'll eventually call you back on its thread through some events, like ...
3
votes
1answer
32 views

Asynchronous socket.io for lots of concurrent messages

We have a web application which currently operates like this on a typical view/page: the front has to display 100+ "previews" (in the form of base64 images) each of this preview is built on-demand ...
3
votes
1answer
94 views

Connection between futures and exceptions?

Is there a connection between futures and exceptions? async-await looks very similar to throw-catch.
3
votes
2answers
246 views

Async library guidance

I'm creating a library that contains a class that exposes several Async methods: public class MyClass { public async Task<Foo> DoFooAsync() { /*...*/ } public async Task<Bar> ...
3
votes
3answers
331 views

What scenarios are implementations of Object Management Group (OMG) Data Distribution Service best suited for?

I've always been a big fan of asynchronous messaging and pub/sub implementations, but coming from a Java background, I'm most familiar with using JMS based messaging systems, such as JBoss MQ, ...
3
votes
1answer
341 views

Why do browsers clamp timeouts and intervals?

I've been working on some abstractions of setTimeout and setInterval in order to process large sets of data without blocking the event loop in the browser. Upon this, I have discovered that browsers ...
3
votes
2answers
362 views

Data Access Layer with Asynchronous services like MQ

I am tasked with creating a development, design and architecture guide for a large multi-year project. I have to dictate best design practices for a number of architectural perspectives. See the ...
3
votes
1answer
334 views

How can I use Windows Workflow for validation of a Silverlight application?

I want to use Windows Workflow to provide a validation service. The validation that will be provided may have multiple tiers with chaining and redirecting to other stages of validation. The ...
2
votes
2answers
2k views

Should we (still) consider a synced XMLHTTPRequest bad practice?

As you may know, XMLHTTPRequest can be used synchronously or asynchronously, but synchronized requests have always been considered bad practice, and I've always agreed with that. Not only is the ...
2
votes
2answers
970 views

What's the best practice for async APIs that return futures on Scala?

I have started a project to write an async PostgreSQL driver on Scala and to be async, I need to accept callbacks and use futures, but then accepting a callback and a future makes the code cumbersome ...
2
votes
1answer
98 views

What are the underlying patterns in systems allowing asynchronous operations?

Say I'm working with a system that allows async, nonblocking operations. If I queue up a set of those operations and specify their result buffer references: nonblocking_write( message, write_buffer ...
2
votes
1answer
860 views

Use cases and usage patterns of futures vs callbacks

I've become interested in futures lately, mostly due to their inclusion in standard C++ - but I see there is an active debate over futures vs. callbacks in many programming areas, such as Node.js. ...
2
votes
1answer
29 views

Remote job execution and synchronization

I have master and nodes infrastructure. Master executes remote jobs on nodes. Each job returns success/failure message back to master. So the flow of execution is the following: master receives ...
2
votes
2answers
536 views

What to Return with Async CRUD methods

While there is a similar question focused on Java, I've been in debates with utilizing Task objects. What's the best way to handle returns on CRUD methods (and similar)? Common returns we've seen ...
2
votes
1answer
650 views

How is the “evented-io” in node.js any different from the windows event model

I'm wondering how the "evented-io" in node.js any different from the windows async IO model? Is the callback from node.js executed on a thread, if not, where is it run? I don't mean to question the ...
2
votes
2answers
304 views

Await state async

For speed we sometimes return response to consumer before state is saved in DB. Sometimes (Mostly for our automated consumers) this can break because the want to make actions on the saved data before ...