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We're currently considering whether it makes sense (or if the benefits are worth the added code) to introduce a Message based pattern (such as Request Response) into a Domain Driven Design / Service Oriented Architecture under an MVC app (with DI and potentially used by MVC, WCF, Windows Services, etc.).
Basically (in ... |
I'm currently reading Benjamin C. Pierce's “Types and Programming Languages”. Before really getting into type theory it explains lambda calculus and evaluation strategies.
I am a bit confused by the explanation of call by name vs call by value in this context.
The two strategies are explained in the following manner:
c... |
I want to learn C but I tend to learn best when I have a project to work on. I've never done iPhone development, so I'm hoping to kill two birds with one stone. Will learning objective c also teach me to program c reasonably well, or are they too dissimilar?
EDIT: I'm mostly wondering if objective-c/iphone-development ... |
I currently have a PIL Image object which I store as an array of bits (1's and 0's). However I now would like to be able to rotate that image 45 degrees. One way to do it is take the original PIL image, apply a transform matrix on it, then convert that to an array of bits. Problem with this approach is that it's compu... |
I'm using a REST API through PHP and I'm a bit confused on the CURL_POSTFIELDS behavior, which implies that I must send a querystring or array, but what I'm seeking to do is just to send a string of JSON text.
In the API I'm using there is no such thing as a field: https://developer.atlassian.com/display/JIRADEV/JIRA+R... |
I'm a junior in college majoring in Computer Science. Apart from writing lots of code, I want to start reading source code written by others to improve my coding skills and learn better/different ways of doing stuff. I was thinking I should start reading some of the key parts of the code in C++ compilers. I think this ... |
My background in mathematics is very poor (i.e. last relevant math class taken was high school Trigonometry two years ago - another story for another time). I'm reading 'Javascript: The Definitive Guide' and it's a term that is being repetitively used and I've sort of just ran with it. But I've come to a chapter (Chapt... |
This link really provided some insights into the idea that binary search implications into the optimization problems by giving the main theorem. I am not really confident that I get the idea of the main theorem suggested there. Are there any easy explanations, for the ideas, expressed in that tutorial?
|
Generally for a javascript application, compatibility is mentioned in terms of browser types and browser versions it supports.
Frameworks/Libraries like ExtJs also mention about the browser versions they are compatible with.
Does this mean that if my javascript application can run on Google Chrome 10+ version, then a... |
What constructs in OOP languages (specifically Java) allow you to enforce design decisions and intent?
I think some examples would be the 'final' keyword, access modifiers, template methods, perhaps interfaces - but clearly I am having trouble coming up with an exhaustive list.
Some constructs, like inheritance, feel l... |
The famous Strassen's matrix multiplication algorithm is a real treat for us, as it reduces the time complexity from the traditional O(n3) to O(n2.8).
But of all the resources I have gone through, even Cormen and Steven Skienna's book, they clearly do not state of how Strassen thought about it.
What is the rationale o... |
I plan to make use of this interface in a plug-in architecture.
/// <summary>
/// Generic interface allowing you to react to an event.
/// You can block the event or just use it for notification.
/// </summary>
/// <typeparam name="T"></typeparam>
public interface IEventObserver<in T> where T : class
{
/// <summar... |
I have recently been reading an article about creating a blog using ASP.NET and MVC, and in the article the user splits the Data Access Layer into a separate Class Library, and creates an interface for this to allow the DAL to be mocked for testing.
This works great for small projects, but I am struggling to see how th... |
I'm designing and implementing a multiprocessing postscript interpreter ("lightweight" processes simulated by a single OS-thread), and I need to generate a unique identifier for each process in the system, as well as maintain ids for any dead processes which still have live references. (Reference: Adobe PLRM, 2ed, Ch. ... |
I am trying to create Export Module for our application, this seems to me a bit complex so I am posting it here
to get some guide lines.
In our database we have a list of Products, which can be exported as XML, RTF or PDF
The user can select one or many products from the list to export. After Selecting the product(s)
... |
What is an example of "Business Logic" that should reside in the DomainModel i.e. inside an Entity instead of inside a (Domain) Service, as well as some example logic that should be in a service.
Here are what I would consider to be pretty clear cases(?):
Basic Validation would be done by the ViewModel definition attri... |
I have a program (technically an addon to a program) whose code I want to be freely available for educational purposes or to create derivatives for personal use. However, I do NOT want to allow unregulated redistribution of either modified or unmodified code, whether for free or for profit.
However, I do want to allow ... |
I'm writing a program for some quiz software. I have a question class containing the ArrayLists for the question, answer, options, marks and negative marks. Something like this:
class question
{
private ArrayList<Integer> index_list;
private ArrayList<String> question_list;
private ArrayList<String>... |
I'm writing a specification for a project, and am struggling with separating functional specification from technical specification (see http://www.joelonsoftware.com/articles/fog0000000035.html).
For example, I'm trying to specify the behaviour when a user requests a list of Foo objects they have visibility on. In the... |
What do you think would be the most effective solution to maintain an object status through a life cycle? The goal to be able to be continue from any state any time. During the life cycle likely to have human interactions over a variety of interface.
For example, an order which needs to be approved by a few people. Or ... |
I am new to Clojure, I am new to Macros and I have no prior background in Lisp.
I went on to create my own switch case like form and ended up with this:
(defmacro switch-case [v cases default] (if (cases v) (cases v) default ))
and then tried making a function and ended up with this:
(defn fn-switch-case [v cases def... |
This may seem an odd question, but I want to create an executable which runs under Windows written in C++. The program needs to be able to update a jar file even if Java is not installed on the target machine. I have seen the src.zip in the Java JDK folder and the jar folder but this is Java code. I assume jar.exe i... |
I work on a project that uses a SQL database as a back end, and a desktop app as a front end. We do releases on a regular basis, and as part of a release, our client needs to update their SQL server.
Our business requires that we are upgradable from version 1.x to 1.y, and the way we've been doing it so far is by follo... |
The following questions gave me food for thought:
Efficient way to shuffle objects
I'd like to write an "ultimate shuffle" algorithm to sort my mp3 collection
When you sort a list - you always have a base-line(numbers, alphabet, ...) which tell you how to order the list.
Question: When you shuffle a set - how would ... |
I heard it said that REST is "document-centric". Unclear what this meant, I began poking around and found the term document-oriented being used of databases, particularly NoSQL databases, and in contrast to a barebones key-value store. Thus it seems that documented-orientation of databases has to do with their internal... |
I am developing an ASP.Net MVC 3 intranet site that will use Integrated Windows Authentication exclusively. What are the vulnerabilities of the challenge/response authentication traffic being sent in plain text? Will someone sniffing the network traffic be able to hijack an authenticated session?
|
I'm writing a web service with several APIs, and they will be sharing some of the implementation code. In order not to copy-paste, I would like to ideally implement each API call as a series of tasks, which are executed in a sequence determined by the business logic.
One obvious question is whether that's the best stra... |
Is there, somewhere, a freely usable/accessible script, source file, or whatever, that is able to measure the compliance of a given C++ compiler?
For example, the Acid3 test for browsers: http://acid3.acidtests.org/
The results I dream of would be a global percentage note (or multiple notes, one for each standard, e.g.... |
We are working on automation of deployment using Jenkins. We have different environments - DEV, UAT, PROD. In SVN, we are tagging each release and placing same binaries in DEV, UAT, PROD. The artifacts already contains config files w.r.t each environment but I am not understanding why we are storing binaries in enviro... |
There is a a program that I want to use that is released in two (fully copyrighted) ways:
Stable binary form
Beta release, mostly-stable binary form that is easy to derive the source (uses jars) (this version is free)
Question:
Can I legally download the beta version, make the necessary changes to work properly on m... |
I would like to build some Ruby tests to test my non-Ruby website. I love the Ruby testing tools (webrat, capybara, etc.) but they seem to be targeted to testing local sites.
How can I use these great tools to test external websites? Is there a way to override their settings so that they don't hit http://localhost fo... |
I couldn't find the answer anywhere, but let's say we have a B-Tree with min = 1 and max = 2: What is the formula to calculate the maximum number of nodes in this B-Tree if the depth is say 100? This question was given on an in-class test to which most everyone had no idea what the answer was. I was completely stumped ... |
This is not a technical question but rather about the right logic on handling delete with foreign key constraint. In my exercise app, I cascaded the record with OneToMany relationship with other records. In other words when I delete the record, Hibernate will automatically delete the associated records.
My problem is, ... |
Recently, we worked with a graphic designer (arranged by the client) to provide the skin for a Django+Bootstrap application we had built. The designer provided a series of static images of the new layout, along with a document describing some technical attributes (font sizes, colours, a few dimensions etc).
It turned o... |
For example I have these two classes:
First
public class Example
{
public Example()
{
}
public int ReturnSomething
{
return 1;
}
}
Second
public class Example
{
public Example()
{
}
public static int ReturnSomething
{
return 1;
... |
I've adopted a tagging system of x.x.x.x, and this works fine. However, you also need to leave a comment with your git tag. I've been using descriptions such as "fixes bug Y" or "feature X", but is this the best sort of comment to be leaving? Particularly, what if a tag encompasses several fixes, it seems not to make s... |
I'm currently coding an API for a social network with the Slim Framework. My question is: What are the best practices when there are no rows to return in the json structure?
Lets say that this call /v1/get/movies returns 2 rows from the table movie names:
[
{"name": "Ghostbusters"},
{"name": "Indiana Jones"}
]
... |
Basically, the objective is to create a visual representation of the software specification document. This visual representation would capture various scenarios involved in the software.
Benefits:
Picture speaks louder than words
Catch scenarios so that they need to be handled by the developer
Becomes a knowledge map ... |
I'm securing a WCF webservice with TransportWithMessageCredential security that uses certificates.
So I'll have to choosee between signing headers & body or signing and encrypting.
Now my question is, after reading Understanding Protection Level what the advantage is of just signing? The fact that WCF will notice that ... |
My understanding is that the first step of defining user stories is to define roles. The problem with role-based systems is that this form of authorization is often too coarse-grained. Hence, people created task-based authorization where roles are still used to lump tasks into groups (see for example rhino security . A... |
I do freelance web development and front end dev is not my strongest point. This question came to me in my recent fixed bid project.
Nowadays we use Jquery and Bootstrap and these take care of lots of cross browser stuff. Still, there are lots of errors in different browsers. It requires testing tools and a whole lot o... |
I'm currently trying to get my head round MVVM for WPF - I don't mean get my head round the concept, but around the actual nuts and bolts of doing anything that is further off the beaten track than dumb CRUD.
What I've noticed is that lots of the frameworks, and most/all blog posts are from 'ages' ago.
Is this because ... |
Suppose you're getting the latest version of a file from source control and a conflict occurs. There are four possible types of changes in the conflict:
Yours
Theirs
Both
Conflicting
Naturally, in cases 3 and 4 you'd want to review the changes manually (in the latter case you even have to resolve it). Regarding cases... |
By default, I want all my local variables and method parameters to be final. Unfortunately, the Java language designers chose a different default: variables¶meters are by default non-final, and final variables¶meters need to be declared with the final keyword. So I need to add lots of finals. (And obviously I d... |
I am doing contract work for various clients and I was wondering how best to go about safeguarding myself against non-payment. The projects will be ASP.NET web applications, most likely intranet-based.
I don't have any more details than that. I imagine that the client will want to run and test the applications from the... |
In Mark Seeman's Dependency Injection in .NET he injects a repository into his UI layer. I believe that he is doing this so that he can store everything in the UI configuration, however this just strikes me as bad design. Wouldn't it be better to pass the service reference into the UI? What is to stop a future develope... |
I am a DBA fledgling with a lot of experience in programming.
I have developed several CLI, non interactive apps that solve some daily repetitive tasks or eliminate the human error from more complex albeit not so daily tasks. These tools are now part of our tool box.
I find CLI apps are great because you can include th... |
Suppose I own a copy of a physics book containing original research. Suppose that this book is licensed under a non-free license.
If I use the formulas and concepts explained in that book in my program, am I infringing the book's copyright?
In my opinion the answer is no because I'm copying ideas, not text, and ideas c... |
We've been getting the head revision of the JEDI Code library for a while, we only use it a tiny bit so never have bothered to manage which version we're getting. The problem is they appear to be totally untethered from SVN now and we'd been including it in our repository as an external and now my build server it kapu... |
I'm trying to wrap my head around TDD, specifically the development part. I've looked at some books, but the ones I found mainly tackle the testing part - the History of NUnit, why testing is good, Red/Green/Refactor and how to create a String Calculator.
Good stuff, but that's "just" Unit Testing, not TDD. Specificall... |
I want to understand the architecture of web apps that use subdomains. I don't think that I'm phrasing this well, so let me explain.
Many web apps, like tumblr or shopify create a user's site on a subdomain. Say for example my tumblr account was johndoe then you could find my tumblr blog at johndoe.tumblr.com. Can some... |
I have an SVN repository set up like so:
trunk
branches
UAT
QA
DevelopmentTeam
programmer1
projectA
projectB
programmer2
projectC
projectD
programmer3
projectE
projectF
projectG
projectH
Each programmer can have multiple projects which are branches, and can be merged to their "programmer" branch.
All programmers br... |
I came across this question in a textbook, but there are no solutions and I'm not sure how to solve this.
The question is: Suppose Host A wants to send a large file to Host B. The path from Host A to Host B has three links of rates R1=500Kb/s, R2=2Mb/s and R3=1Mb/s. Assuming that there is another busy flow that travels... |
I am inquiring about a web app which uses Spring MVC and hibernate on the server and
ExtJS 4 (Sencha JavaScript framework) for the client framework (widgets).
The app is cloud-hosted - it is not "distributed" to users. It is required that users
of the app shall need to purchase a license from the vendor in order to u... |
Does a domain specific language use other languages like c++ or java, or is it standalone?
|
I have a client who would prefer to host their application on Linux. However, my coworkers and I have very little experience with Linux. This is a short project with a low budget, so making choices that save time and money are not just desired, they're a must. We are also heavy on continuous integration and automation,... |
Where I work we have over a dozen internal SW systems that we have developed in-house using a variety of technologies, frameworks, and languages. Those include various from Microsoft (ASP.NET Web Forms, WebAPI, WinForms, SharePoint, Office Automation, Win8 Native Apps, SQL Server, SSRS) and others not from Microsoft (p... |
I am an intern at a small software company, doing typical grunt work. Many tasks that the actual developers are doing are above my head however I finally got to see some real "action" and write some code myself. I will admit the task was perhaps a bit too difficult for me but I managed and my coded worked in the end. W... |
I have a cross platform math library that I am working on and I want to make sure that some common operations are performed in an optimized manner, so I wish to use some intrinsic functions wrapped in inline functions to compute things such as sqrt(float/double). I should mention that at this point I only plan on targe... |
We are developing an application; it includes a library developed by another coder, this library communicates with server via multiple network connections, and this involves multiple threads working together. The server side code is quite complicated, and we don't have access to the source code.
Recently I've discov... |
I'm a bit green to web applications although I am in the final phases of developing one for a client. I'm using Django with Gunicorn/Nginx on an AWS m1.medium. The database (MongoDB) is on a separate instance. The client is paranoid about scaling and so I threw together a crude monitoring server which has the ability t... |
Many of us coders, programmers and developers struggle with repetitive stress injuries, carpal tunnel, etc.
I've been curious about introducing voice control into my workflow in order to save myself some stress.
This has led me to my current question: Would it be possible or practical to implement a programming languag... |
I hope this is right area on Stack Exchange to ask this question. People out there have built emulators for every game console but I don't understand how they do it. I consider myself (and have the professional title of) a senior level developer in several languages including Javascript but I don't have the faintest i... |
Ok, so this is not the most advanced programming question - and it kind of borders on e-commerce, but it has specifically come up twice in my career - which is only 10 years old, so I figured I would ask it.
Question: I want to markup a price 10% from its original cost for a website, which is the proper way to do it:
N... |
Background:
We have a class that both listens on a socket and sets values on itself based on what it reads off the socket. I believe that adheres to SRP.
To adhere to ISP we created one interface for socket stuff (eg. StartListening, StopListening) and another interface which contains read only fields for the values r... |
So I'm not sure if this is really the right place to ask or even the right question but I want to give it a try.
Requirements:
We should have a database & webservice (or something similar) which runs in OUR office, clients cann access the application via the internet ("wohooo").
Clients must be able to create orders in... |
If we assume we have this little snippet of code:
string str = "checked";
bool test1;
if (str == "checked")
{
test1 = true;
}
else
{
test1 = false;
}
Is it bad practice to change a simple statement like this to the following?:
bool test2 = (str == "checked");
Because they work exactly the same, and work as r... |
Sue is designing a JavaScript library, Magician.js. Its linchpin is a function which pulls a Rabbit out of the argument passed.
She knows its users may want to pull a rabbit out of a String, a Number, a Function, perhaps even a HTMLElement. With that in mind, she could design her API like so:
The strict interface
Magic... |
Most of my work is creating websites in Django (a Python web framework) and deploying them to my own or clients' servers. I work from a virtualenv to separate site from system packages and have perhaps 60-80 packages installed in there and that lot is shared between two-dozen sites.
This obvious limitation to this app... |
Is it possible to build an operating system that contains some Turing complete compiler (language?) but is unable to run any malware? Or is there any definition for a malware?
This question popped on my mind as I was wondering why Windows has more malware than Linux. If Linux contains a C programming language and its c... |
I'm trying to figure it out some nice workflow for our company, and we have so far the main repository on the github's organization account and we all, the members of the team working on the branches of that repo.
Could you please mention some advantages on forking the repo or some use, by the members of the organizat... |
We've been using Git as our version control but as the team grows, there are more and more pains when it comes to getting all our changes onto a single branch ready for a deployment.
I'm wondering if maybe we're outgrowing Git as an effective collaboration tool. I know there are large OSS projects with many developer... |
I've inherited a hosted system (system "A") which can be used to manage products, inventory, and orders, and can send those products to various third-parties.
Quite simply, system "A" doesn't work. The product and inventory systems are slow, convoluted, and buggy. The third-party integration doesn't work at all. The co... |
As Semantic Versioning (and common sense) declares - the major version is incremented in case if non backward compatible change is introduced.
Now let's assume we have a project called Project that has a current version 1.0.42 and a library Lib it depends on that is of a 2.1.3 version at the moment.
Does that mean that... |
Mocking frameworks are useful for creating mock objects that isolate the code under test from its surrounding software environment. Some mocking frameworks cannot mock non-virtual methods, so they require that you create an Interface for each class, if you don't want to make the methods virtual.
How do you distingui... |
The amount of servers and the complexity of our application is growing and we now have servers in different regions (hosted on AWS). Certain database operations require low latency so we have stuck a database in each region (which is basically a user cache) to keep the network latency low. The way the application ser... |
I can easily follow the Semantic Versioning recommendations if I develop a library or API, but what if the developed product is a website or a desktop application?
When would you increment a major component in that case?
In case of a complete UI redesign? Or something else?
Thoughts?
|
After 2 years, I'm still struggling with MVVM as a practical method of producing working software. In some cases it's great. I did a multithreaded application that controlled a small assembly line that would have been a nightmere without MVVM concepts. An abstraction from the physical assembly line was almost a no b... |
New with Mongodb, and I'm not sure what implications or benefits there are between the use of an array vs an object.
So..
As above what are the implications and benefits between the use of arrays and objects?
For example my case. The idea is to store a document with a "capture" time, and a 2000 slots of "packet" count... |
I have a MVC which has this structure:
ui
controller
db
model
Basically the controller doesn't really do much more than connection ui with db layer.
Do I need to provide JUnit tests for the controller (if the program's point matters, it's my semester project)?
Would that help me somehow as there isn't much code - I b... |
I am currently thinking of the following branching strategy
Main branch
Development branch
Feature branch
Release branch
Basically the whole idea is to have a release branch so that hot fix can be applied quickly for specific release.
Here is the issue what if I have an urgent feature that I need to do for a specif... |
Please can you answer a couple of questions based on the code below (excludes the try/catch blocks), which transforms input XML and XSL files into an output XSL-FO file:
File xslFile = new File("inXslFile.xsl");
File xmlFile = new File("sourceXmlFile.xml");
TransformerFactory tFactory = TransformerFactory.newInstance()... |
When forming opinions, it is a good practice to follow scholastic tradition - think as hard as you can against the opinion you hold and try to find counter-arguments.
However, no matter how hard I try, I just cannot find reasonable arguments in favor of antivirus (and related security measures) on development machines.... |
I'm have been doing some research into making code more testable and modular, but after reading alot about AMD based JavaScript, it doesn't appear to fit the needs of a static website. Is this assumption correct? Is AMD based development geared more toward highly interactive web applications that simple websites?
|
For what I know, encapsulation is useful because:
if you use directly an attribute and change its type in a static typed language you have to change all the code that uses the class. On the contrary, if you have declared getters and setters for that attribute you have not to do this
it hides the internal functioning o... |
I have a service where users can upload/download/replace/delete files. These files have about a dozen attributes that are saved to a SQL Database. Periodicaly throughout their session they will have to download a summary (FileName, size0in-KB, and ID) of a subset of files.
When working in the service it creates an obje... |
I'm currently working on a client's project that involves programming in multiple languages. It has gotten to the point where the amount of source code for each language has grown to such a large volume that it's difficult to navigate. Especially when returning to that code base after an extensive break working on othe... |
Technically not my first, but my new client wants to enter into negotiations regarding the cost of a website.
It's fairly straight-forward, it's a little bit more than a portfolio page, and I should be able to finish it without much complications.
However, I don't know how to make an estimate to enter negotiations. O... |
I have two git branches with almost the same code, but some minor changes in order to support different platforms.
I need to maintain these changes because I need them to run the software on different computers. So there is no master and development branch, both are equally important.
Nevertheless, I need to "synchro... |
We want to be able to offer users of our software the facility of having a miscellaneous folder for each of their clients.
All these client folders would be stored together in another folder called 'miscellaneous data' for example
It would be accessible via an icon in the client record window in our software and would... |
I do Entity Framework stuff using repository patterns that are passed to the controller to than be called by the client using jquery AJAX.. Is there any basic rules on in what format I should be passing around these lists? Within the server code I suppose I could just pass around an Iqueryable? yes? And to the client... |
I started out with a script that was a few hundred lines. Later, I realized I wanted another script that would require much of the same code. I decided to wrap certain areas of the original script that would be shared, into definitions. When I was deciding exactly what should be in a function, I came across various thi... |
I'm in the beginning of creating a website that uses Google Datastore to store information related to clients and I'm curious if the record is too deep for NoSQL or if I'm fine.
Essentially I'll be storing details about clients at a fitness business that get's fairly detailed.
A completely made up record example could ... |
Statistically speaking, user story maybe the most popular requirement technique in Agile but I am curious to know the alternatives and why.
|
I would be interested in formally defining (and consequently demonstrating) a "type system" for, well, a type system. More specifically, I would like to explore the idea of what C++ calls concepts for my bachelor's thesis. How would one go about defining such system (formally) ? It's basically a meta-language for gene... |
Say you have a list of "vehicles" - you have an observableArray of these ko.observable()s.
You let your user add a new vehicle with the following:
var emptyVehicle = {
"make": "chevrolet",
"model": "corvette"
};
app.on('CLICKED_ADD_VEHICLE', function () {
var vehicle = new vehicleViewModel(emptyV... |
I have the following user story:
As a registered user i can request for a new license key
with the following condition
When the user request a license key they required to enter some
hardware id
Should i create another user story base on this condition? example
As a registered user i can request a new license key ... |
I keep hearing about early and late binding, but I do not understand what they are. I found the following explanation which I do not understand:
Early binding refers to assignment of values to variables during design time whereas late binding refers to assignment of values to variables during run time.
Could someone ... |
The C standard states that any character in the machine's standard printing set will never be negative.But the following code:
char c=1234;
printf("%d\t%c",c,c);
gives a negative output and prints a strange character,meaning that the character is in machine's printing character set.Is the C standard being violated her... |
From MSDN, we have the following definition of WCF Binding
Bindings specify how a WCF service endpoint communicates with other endpoints.
At its most basic, a binding must specify the transport (for example, HTTP or TCP) to use. You can also set other characteristics, such as security and transaction support, through ... |
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