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2
votes
1answer
92 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. ...
0
votes
1answer
83 views

Async properties in interfaces to cater for the possibility of expensive first-time evaluation: Is this a good idea?

First of all, sorry if this post is too long. I'll start with the… Short version: Is it generally advisable or a good idea to design an interface property as asynchronous simply because we cannot be ...
3
votes
1answer
135 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 ...
1
vote
0answers
96 views

Callback pattern handling exceptions - Best practices in .NET 3.5

I am looking to implement the callback pattern with error handling such that error is caught and pass to the callback code with the response. Since I am using .NET 3.5, I cant use Task (TAP) pattern ...
0
votes
2answers
132 views

In Node.js, are non-blocking constructs usually preferable to blocking ones?

Is the following a statement of best practices in Node.js with regard to web applications? If not, how could it be improved? The statement The lifecycle of any web app has at least two phases: a ...
3
votes
1answer
115 views

What is a good design approach in .NET for performing a series of checks in background process?

I have a flight planning system in .NET/SQL Server which needs to perform several validation checks. This needs to work on both a windows and a web client. Currently the checks run synchronously but ...
-2
votes
1answer
105 views

Asynchronous Web Language [closed]

I'm searching for a suitable way to make web requests to databases and display results in real-time. The data will be used in an interface for staff, so there cannot be any blocking or lag as time is ...
1
vote
0answers
44 views

Synchronizing web ui and third party async services

I'm looking for concepts, approaches or even Framework/libraries to help me synchronize state reliably from web UI to a third Party Service. For example: creating a JavaScript irc Client ui you need ...
3
votes
2answers
157 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 ...
3
votes
1answer
141 views

How to handle asynchronous calls in an offline application

I'm using an offline application's javascript API and I'd like to know if I can use deferred objects to handle the callbacks. The API calls do not use HTTP, the calls are to and from the applications ...
1
vote
0answers
133 views

Gevent - Make blocking calls non-blocking

I have the blocking code shown below. Is calling monkey.patch_all() enough/optimal to make it non-blocking? Does Gevent handle iterations like these? # front page def front_page(): database = ...
0
votes
2answers
207 views

Making server logic independent of client interaction

I'm trying to make a realtime multiplayer web-game in node.js with express framework and socket.io library. But I can't seem to make my server-side logic independent of client interactions. I want ...
4
votes
1answer
295 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 ...
5
votes
1answer
1k views

Efficient mixing of sync and async methods within a single method?

Okay, it sounds odd, but the code is very simple and explains the situation well. public virtual async Task RemoveFromRoleAsync(AzureTableUser user, string role) { AssertNotDisposed(); var ...
0
votes
1answer
470 views

Good practice using signals and event driven system

I am using signals (specifically Boost signals2) to create an event driven protocol API and model. Most elements have their own signals, and there are usually multiple of each element. Consider a ...
0
votes
1answer
109 views

Term for an error when code is executed before its ajax response? [closed]

What's the term for an error caused by executing a block of code before its relevant ajax response has come back? e.g., a timeline: 13:00:01 execute getDataViaAjax(); 13:00:02 execute ...
7
votes
1answer
547 views

How can we calculate Big-O complexity in Functional & Reactive Programming

I started learning functional programming, I am trying to compare between different algorithms that are written in an imperative, functional , parallel programming and using Collections and Lambda ...
0
votes
2answers
181 views

Why would Java app make RPC call to itself?

I am working with a multithreaded homegrown multi-module app in my new job. We use the the Thrift protocol to communicate RPC calls between different stand-alone applications in a distributed system. ...
0
votes
1answer
286 views

Design pattern for locking asynchronous operations in Objective-C

I'm writing my first Objective-C Class. It's responsible for interaction with an HTTP SSO authentication service. The process requires multiple HTTP transactions in order to complete. The Class acts ...
4
votes
1answer
559 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. ...
1
vote
6answers
774 views

Benchmark of asynchronous code

Asynchronous programming seems to be getting quite popular these days. One of the most quoted advantages is performance gain from removing operations that block threads. But I also saw people saying ...
1
vote
3answers
499 views

Which layer does async code belong?

I am developing an application that consumes data from an external service. The application is being implemented following a typical layered architecture with UI, Presentation, Domain and Data ...
1
vote
0answers
152 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 ...
1
vote
3answers
292 views

Synchronization in the given Code

I had an interview few weeks back, and I was asked to write a code with Setters and Getters. I had written the following code; // Just an example Class ABC{ private int num; public void ...
0
votes
1answer
435 views

Provide multiple SendCompleted callbacks to SmtpClient

I have an Email class that has a Send method that optionally takes an SmtpClient and sends an email asynchronously using SendAsync. If no SmtpClient is supplied to this method, it instantiates a ...
13
votes
3answers
4k 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
3k 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
2answers
1k views

Design pattern for client/server sessions? [closed]

Are there any common patterns or general guidance I can learn from for how to design a client/server system where the both the client and server must maintain some kind per-client session state? I've ...
8
votes
2answers
8k 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 ...
1
vote
2answers
257 views

In an event-driven environment, how should a “cancel” function abort all further events?

In my iOS app, things are mostly driven by events. The user presses a button The app listens for an external device to be connected to the iOS device Once the device is detected (is connected), an ...
3
votes
5answers
3k views

Is it possible to half-way synchronize javascript functions that include async calls?

I am wondering if there exists a way to half way synchronize javascript functions, where data is requested on the fly. I don't want to make it purely blocking (which I guess is impossible), I just ...
12
votes
3answers
5k 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 ...
2
votes
1answer
103 views

Reporting and handling asynchronous process errors to a client

I have a product with two separate applications. The core of the product lives in the database (oracle) and runs according to a schedule. The other is a client application (currently ASP.NET MVC3) ...
1
vote
2answers
311 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 ...
13
votes
1answer
3k views

Learning Asynchronous programming

Asynchronous non-blocking event driven programming seems to be all the rage. I have a basic conceptual understanding of what this all means. However what I'm not sure is when and where my code can ...