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-1
votes
1answer
170 views

Is class with callbacks a code smell in JavaScript? [closed]

When writing JavaScript (especially in node.js), I tend to use plain functions and callbacks. However, sometimes there's some context to share between some functions and I don't like to pass this ...
2
votes
2answers
182 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 ...
1
vote
0answers
22 views

What happens differently when you add a task Asynchronously on GAE?

Google's doc on async tasks assumes knowledge of the difference between regular and asynchronously added tasks. add_async(task, transactional=False, rpc=None) Asynchronously add a Task or a list ...
3
votes
5answers
331 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 ...
4
votes
1answer
214 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 ...
2
votes
2answers
244 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 ...
4
votes
1answer
278 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 ...
0
votes
0answers
503 views

Best method for async initialization of view model in MVVM pattern (WPF)

I'm working on a business application (C#, WPF, EF, MVVM). I need to load a bunch of items from database, create view models for them and put them in a window. Is there a way to create the view model ...
1
vote
1answer
103 views

How to Avoid a Busy Loop Inside a Function That Returns the Object That's Being Waited For

I have a function which has the same interface as Python's input builtin, but it works in a client-server environment. When it's called, the function, which runs in the server, sends a message to the ...
-2
votes
1answer
581 views

Do we need even more web frameworks in C# now that async await is here

Developing endless frameworks for web application, websites and web services is always great fun. It's one of the richest areas where you have 100 different ways of achieving pretty much the same ...
4
votes
1answer
438 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. ...
2
votes
1answer
141 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 ...
1
vote
0answers
145 views

Is Windows Workflow Foundation appropriate for a CPU-heavy async application?

At one of the DevDays conferences a presenter said that Workflow Foundation isn't just for applications that require persistence, but they can make it easier to write and maintain Async WCF code and ...
13
votes
3answers
3k 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 ...
9
votes
1answer
2k 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 ...
1
vote
0answers
190 views

Single write, multiple read of stateful objects

Scenario: One data input feed (call this Source) Multiple objects (call these Layer1) read this Source, and analyze the feed. This analysis is stateful. Layer1 objects have configuration parameters. ...
1
vote
0answers
253 views

Atmosphere + Long Polling : No message distribution?

I'm experiencing a strange behavior with Atmosphere + Long Polling. I'd like to have a broadcaster per user, so I have registered a broadcaster on resource suspension with id : /user/. I use ...
-2
votes
2answers
152 views

Calling blocking functions and execute code when result is ready, but without callbacks

I am designing an application that has some scripting capabilities: the host application may call the scripts to perform some operations when some events occur. To keep it easy and newbie-friendly, ...
3
votes
3answers
676 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 ...
8
votes
3answers
5k 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 ...
5
votes
1answer
230 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 ...
8
votes
1answer
449 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 ...
16
votes
5answers
2k 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 ...
7
votes
2answers
11k 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 ...
4
votes
1answer
161 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 ...
10
votes
4answers
2k 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 ...
2
votes
2answers
724 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 ...
4
votes
1answer
363 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 ...
4
votes
2answers
2k 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 ...
0
votes
2answers
886 views

How to present asynchronous state change in chart or diagram?

I started to study about state transition chart. As I see, it assumes all state transition is done instantly with no time consuming. But in most of my case, I'm heavily depending on asynchronous I/O, ...
15
votes
3answers
6k 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 ...
5
votes
2answers
496 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 ...
11
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 ...
0
votes
1answer
1k 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 ...
3
votes
1answer
313 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 ...
3
votes
1answer
369 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. ...
4
votes
2answers
793 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 ...
3
votes
5answers
568 views

Where was “async” all these days?

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 ...
10
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 ...
1
vote
5answers
493 views

Ways of handling asynchronous receive calls

I am implementing a primitive message-passing system. Currently, I am designing a receive function for async calls. Can I implement such a async receive function without using callback functions?
6
votes
2answers
943 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? ...
1
vote
1answer
586 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 ...
14
votes
4answers
2k 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 ...
2
votes
3answers
529 views

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

I understand that (1) XML/XSLT/XPath and (2) asynchoronous 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
3answers
276 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, ...