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I am starting a new project, and I want to follow the separation of concerns pattern, and I have been reading on the topic, and now I am in doubt of how I should go about this. Here is how I thought I should go about it: Application/Presentation Layer uses the Business Layer. Works with the entity interfaces. The Bus...
For example I have class ItemDownloader which has method downloadItem. This method creates instance of another class - Download to perform actual downloading. Question is: I want to test ItemDownloader in isolation, so I will probably mock up Download. How should I do it? P.S.: Question is more about design than implem...
I am migrating to using the new Storage Client Library for my Azure Table Storage. Querying with the previous Storage Client Library 1.7 namespace: var orders = serviceContext .CreateQuery<Order>(tableName) .AsTableServiceQuery<Order>() .Where(e => e.PartitionKey == pa...
There are a lot of very smart and experienced people, who claim that if you don't write unit tests then your code will be buggy and God will kill all kittens. On other hand, another bunch of smart people will say that unittesting is counterproductive. So if you will write unittest then kittens will be damned too. Also,...
On my last large project, I used dependency injection really heavily. I started out using constructor injection but even two or three dependencies resulted in really ugly code. public MyClass( IDependency1 dependency1, IDependency2 dependency2 IDependency3 dependency3) I am not a fan of property injection...
I just started building an iOS app and wanted to get some feedback regarding views. I've got specs for Activity Page Activity Recording Activity Create Activity Save Each of the specs show a different function, but would each of these be a brand new view in my iOS app?
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 asynchronous call is made to a web service (to check for user authenticity) The web service returns the user's authenticit...
I recently came across an algorithm design problem that I'd like some help with: Given some letters, for example a,e,o,g,z,k,l,j,w,n and a dictionary of words. Find a word in the dictionary that has most letters. My first attempt: Let us assume that the dictionary is in a tree. Start by finding the permutations of th...
I have read numerous times that programming languages when making games or large software often use multiple languages / scripts together. I'm wondering how that works. How do they compile it? How does it work together? Also, how does this work with web design also, i.e. How does one combine their HTML/CSS with their ...
I would like to have a menu like this in surfdome. I don't mean the UI but the flexibility of this menu. I will try to explain it. I have some products. I want to match these products with some categories and have multiple type of menus based on these categories. e.g. (in [] are the categories and in () are the prod...
I am programming in PHP and I have an include file that I have to, well, include, as part of my script. The include file is 400 MB, and it contains an array of objects which are nothing more than configuration settings for a larger project. Here is an example of the contents: $obj = new obj(); $obj->name = "myname...
I've joined as a fresher (trainee) a software company developing for Windows Store. I don't know much about C#. My company has started Windows Store development recently. They didn't do .Net development before, that's why my company got an Senior .Net employee to complete the project. Whenever he completes the project...
There are plenty of questions around regarding random number generation, but I couldn't find anything that exactly matched my question. Apologies if I missed one. Most random number generators in software tend to have flat distribution - in the given range, any number is as likely to come next as any other (more or les...
I have a question as to the proper best practices revolving forking code. I've taken code base licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 and brought significant changes to it to suit my needs. I feel as though my version could benefit others and wish to redistribute it. I'm unsure what ...
I'm working on a large project at the moment and I'm trying to document the communication protocol that sits on top of a message queue middleware. The documentation is intended for another organisation that is going to be implementing a new back end to the client. The messages format uses protocol buffers, so I'm less...
Frequently, in my programming experience, I need to make a decision whether I should use float or double for my real numbers. Sometimes I go for float, sometimes I go for double, but really this feels more subjective. If I would be confronted to defend my decision, I would probably not give sound reasons. When do you u...
I have the following Azure Storage Table. PositionData table: PartitionKey: ClientID + VehicleID RowKey: GUID Properties: ClientID, VehicleID, DriverID, Date, GPSPosition Each vehicle will log up to 1,000,000 entities per year per client. Each client could have thousands of vehicles. So, I decided to partition by...
Quite recently, I thought about the use of as, is and direct cast in C#. Logically, is it a better idea to use : var castedValue = value as type; if (null != castedValue) { // Use castedValue. } than : if (value is type) { var castedValue = (type)value; // Use castedValue. } But I still have issues ...
I'm in the process of rewriting a small application from console mode to a GUI mode. The input is a file with log data from a measuring device: ... 00029;00044;00076;00044;00021 00309;00032;00037;00000;65535 00013;00016;00008;00007;00005 ... Each row of data represents 5 counters which summarize the range in which the...
I have read a few of the articles related to the Language Oriented Programming paradigm. Therefore, I concluded that LOP paradigm can let programmers be more productive because of it's extensibility. Are there any programming languages that are already implemented LOP or in development status?
Is it considered a good practice to have a remote branch for each individual developer in the project? We're using Git with the following branches: master release develop If each developer had their own branch, they could push code into their branches and others could merge these changes into their own branches.
I have moved to a new project and as the only 'software guy' I'm welcome, and expected, to suggest design improvements to the existing code (code just got out of prototype phase and needs extended to final releasable version; plus adding functionality) The code has multiple stand alone components which are suppose to r...
I need to create a web service using the .NET platform for accepting file uploads. What are the options available for doing this in C#? What is the best approach to use? Can please you provide me with blogs/code samples/references for further reading?
I have some C++ knowledge and know that pointers are commonly used there, but I've started to look at PHP open source code and I never see code using references in methods. Instead, the code always uses a return value instead of passing the reference to the variable to the method, which then changes that variable's va...
At our company we have an existing translation ms-sql table wich stores strings like this: Id | Key | Language | Value 1 | hello-world | nl-BE | Hallo Wereld 2 | hello-world | en-GB | Hello World There are 3 languages in the system and I expect this to grow to a maximum of about 10 in the future This ...
I am in high school at the moment and soon reaching stages where I would have to make choices. To introduce, I love programming. I had started learning programming a year ago and have some experience with ActionScript3 and Java + (the web languages like html CSS JavaScript. But php I have found a bit hard to understand...
Is it a bad practice to rely on an auto-incrementing primary key to sort rows in a table? A coworker and I were having an argument about this subject. We need to be able to find the last-inserted row in a table, and we have no create/update time columns (which might be considered a bad practice in itself, but that's a ...
Background This question stems out of an architectural discussion we had at work. For the current project we are using Python and an object oriented database. There are input services that we consume, and certain interfaces that we are expected to provide output through. Someone on our team started designing a data mod...
I'm working in a software development area in my university, and we've noticed we need some system to track errors and bugs, who and when it is dealt with. I've researched some software management/bug tracking applications, with Redmine being the one that appeals to me the most because of its simple UI (actually I disc...
The question is pretty self-explanatory. I've had some experience with git-flow, and not much more true experience with plain git before that. (I was using it more as a backup-provider.) I'm confused as to what consensus is, given that I can safely assume that there are a large number of git users who miss 'the good...
So, I'm designing an MVC framework. In the name of keeping everything statically typed and non-magical, I've come to quite a problem with "automatically" passing models to a controller. So, traditionally, I usually see no more than one model used at a time in a controller as far as automatic-population. For instance, t...
I am trying to develop a Delete command through BDD that will simply delete an user from the database, given user_id as a parameter. What can be some possible behavioral tests that will drive me to write a proper implementation for the command?
The often known as likely and unlikely macros help the compiler know whether an if is usually going to be entered or skipped. Using it results in some (rather minor) performance improvements. I started using them recently, and I'm not sure how often should such hints be used. I currently use it with error checking ifs,...
I'm working on a simple widget system (single window, fixed size). Each widget gets its parent (i.e. the widget containing it) passed into its constructor - except for the root widget, which I called Screen. I have some doubts if that approach makes sense. I did it because most of the widget systems I used before do it...
Static code analyzers like Fortify "complain" when an exception might be thrown inside a finally block, saying that Using a throw statement inside a finally block breaks the logical progression through the try-catch-finally. Normally I agree with this. But recently I've come across this code: SomeFileWriter writer = nu...
All over the internet, I see the following advice: A GET should never change data on the server- use a POST request for that What is the basis for this idea? If I make a php service which inserts data in the database, and pass it parameters in the GET query string, why is that wrong? (I am using prepared statements...
With pre written programs available, needing just editing, should programmers also learn writing them from scratch?
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 into one result set for my web app to use. I want to scale this out and add as many other APIs as I can (currently lookin...
There's some subscription-based data processing web service - users pay via PayPal for the right to use the service. The "terms of service" document prepared by lawyers explicitly says that there're no guarantees so customers can't possibly file a lawsuit. Now the service doesn't always work trouble-free. Sometimes the...
I'm designing a system that is built on several small applications written in python, some of these will be services and others will be programs that only run during special situations. What I need to achieve is to let the server communicate to a service when a certain event occurs with some small amount of data. So th...
I'm tinkering with a query abstraction over WebSQL/Phonegap Database API, and I find myself both drawn to, and doubtful of, defining a fluent API that mimics the use of natural English language grammar. It might be easiest to explain this via examples. The following are all valid queries in my grammar, and comments exp...
If we have a class main and the constructor of main constructs our setupclass and we put this class in a try catch in main. Theoratically Will all errors go into catch? If they will how will it effect the performance and mantainability? Will the application be crash free?
I'm developing a board game that has a game class that controls the game flow, and players attached to the game class. The board is just a visual class, but the control of the movements is all by the game. The player can try to make false movements that lead to the game telling the player that this kind of movement is ...
This is long question I know. I have a few options for what I want. I don't want to know "this is obviously the best," but maybe any pros or cons I may be missing about the options, as well as any options I'm unaware of. We have a java application seperately run as multuple daemons, each a seperate JVM. Right now S...
In my job I have to maintain a poorly written codebase which is both hard to understand, has tons of comments that are just plain wrong, has a bunch of weird decisionmaking going on in it and a whole lot more. I primarily do bugfixing which ranges from finding that little comment somewhere in the code that makes some ...
I originally asked this on plain old stack but it was closed for being too open-ended. (Which was a good call as this is a better place for such questions.) Original Link: https://stackoverflow.com/questions/15132135/opengl-image-load-store-atomics-applications So, I've been spending the last couple months or so getti...
I've been looking for get this website done for a long time. I thought with a well organized write-up of what I wanted, as well as having clear examples done in photoshop of faux pages to give an idea of the vision, and no hidden surprises, I would be a programmer's dream job. Unfortunately, no company will touch the w...
This is my usecase: Traverse a filesystem, gauge its entire size and then upload it to Dropbox. Looks quite easy and is quite easy. Now if I do it using celery and spawn a thread for each folder(With sub files), then it becomes an easier process to gather all the data and gauge the size and then upload it to dropbox. ...
I'm interested in transitioning my development environment onto the cloud. I currently use VirtualBox with Vagrant to manage separate virtual machines for each individual project. What would be the optimal setup for hosting these virtual machines in the cloud? Given than I have nearly a dozen VMs, setting up separate ...
Several governments are starting to publish open data: datasets generated by the goverment, made freely available for citizens to use for value-added app development, analysis, and feedback. For instance, the City of Vancouver (Canada) Open Data Catalogue publishes 130 datasets. The subject matter ranges from tabular f...
My situation: I have written a framework before I started my new job. I own the copyright. It has a bunch of boilerplate logic inside of it, like any piece of software. (duh!) I don't want to use the whole framework in my new job, but I do need to re-use some parts of it in a similar framework that I am building for m...
As far as I know, main () function has the following prototypes: int main(); int main(int argc, char **argv); Now, C does not support overloading, then how are multiple prototypes of main () supported?
I plan to program web applications for small companies. When I read about ASP.NET Web Forms, I liked its way of building dynamic sites. However, I have heard from a friend that Web Forms could increase the size of the pages because of ViewState output. Will the difference between the size of PHP pages and the generated...
If I am taking data from a website, for example status updates from Facebook and showing them on my website. What possible damage can be caused if I am not taking into account that the code written as status update would execute on my website? For example, Mr. Simon has putted his status update, "<p style="color:red;">...
I want to make a desktop application- an analog-clock with the option of setting alarms using java. For rendering all the graphics and the button features, a Swing applet is the answer. But the problem is that I want to run the applet onto the desktop and so need an applet viewer like thing. Applet viewer comes with th...
My problem is quite complex to explain and my English is not excellent, so I hope you can understand my question. In a service oriented architecture there are some modules that own data used by all the others applications end these modules expose the data via Remote Method Invocation and Web Services. We the developers...
I have been reading up on the seminal and excellent book Code Complete. It discusses about the various kinds of couplings that can happen between modules(which may be classes as well as methods): Simple-data-parameter-coupling Simple-object-coupling Object-parameter-coupling Semantic coupling The book has to say this...
Here's something from Slonneger's "Syntax and Semantics of Programming Languages": A variable may occur both bound and free in the same lambda expression: for example, in λx.yλy.yx the first occurrence of y is free and the other two are bound. I assume the free variable is the y right after the λx. and the bound ...
I came across the analogy of the class being a cookie cutter and the cookies being objects while reading Code Complete. I fail to see why this analogy was drawn.How is it related to the concept of objects being run time instances of their classes?
I have the following task: developing a program where there is a block of sample text which should be typed by user. Any typos the user does during the test are registered. Basically, I can compare each typed char with the sample char based on caret index position of the input, but there is one significant flaw in s...
Every instruction comes from main memory/RAM. In a bootloader, at least on Intel and IBM PC firmware and designations, you have BIOS jump to a memory address to begin fetching instructions for whatever purpose, usually to load a kernel, when or where does the instance of a process begin? The hardware stacks are limited...
I've seen several different ways to design WCF services, and it seems some developers prefer parameter wrappers while others favor 'naked' parameters. To explain what I mean, consider the following service interfaces: 'Naked' Parameters [ServiceContract] public interface IService { [OperationContract] string[] ...
I'm looking for guidance from someone who has successfully hired a freelancer to assist with writing software they later marketed publicly. Simply, what kind of software agreement should I have the freelancer sign so I have full rights over the code and cannot be sued later. I'm currently independent but have plans to ...
This has been bugging me for a while. Most of the time, when it comes to storing data in structures such as hashtables, programmers, books and articles insist that indexing elements in said structures by String values is considered to be bad practice. Yet, so far, I have not found a single such source to also explain ...
The problem We need to store data in a table-like way, but we have very strict space constraints (~1Mb per table of 10k+ rows). We store data like this: ID | reviews | factor | score | interval | etc. ---+---------+--------+-------+----------+----- 1 | 244 | 2.4 | 10 | 4268 | ... in a simple binary form...
If I want to program in a "functional" style, with what would I replace an interface? interface IFace { string Name { get; set; } int Id { get; } } class Foo : IFace { ... } Maybe a Tuple<>? Tuple<Func<string> /*get_Name*/, Action<String> /*set_Name*/, Func<int> /*get_Id*/> Foo; The only reason I'm using an int...
I recently finished this book called The Elements of Computing Systems where you build a working computer system from the ground up, starting from basic logic gates, to creating your own machine code and Assembly language, to intermediate code, and finally a simple object-oriented programming language that compiles dow...
I tried doing a Google search, as well as searching this Stack Exchange site but could not find a question relating directly to this. The PEP 8 -- Style Guide for Python Code has lots of good style recommendations, however I don't think they mention anything about whether a space between a minus or negative sign (-) an...
In C++ I was told that my classes shouldn't have getters and setters: Doing it wrong... blog post. On the other hand, in Objective-C, the direct use of ivar is discouraged, because the getters allow to do lazy instantiation, and setters make KVO easy. Why is that difference?
Our teams is having the following discussion: Let's say we have the following two methods: public Response Withdraw(int clubId, int terminalId,int cardId, string invoice, decimal amount); public Response Withdraw(Club club, Terminal terminal,Card card, string invoice, decimal amount); whats sent over-the-wire are jus...
My team and I took over a medium sized codebase over a year ago when the previous tech lead left the company. Originating from the lack of man power I fear we favored pragmatic solutions over best practices a little too much. Now, I have to deal with a constant decline in code quality and some kind of organic growth of...
I understand that computers are basically a complex system of electrical signatures that can calculate based on logic boards, and some sort of gate mechanism, but how do computers process something like if the number produced by the keyboard is less than 10, or if a mouse is clicked two times in a certain amount of tim...
I have designed a RESTful API and I am now working on creating a web application to use the service. One thing I am struggling with is how to manage alerts in the web application (similar to the alerts stackoverflow gives in your profile for a new answer, response etc). Basically the web application is a workflow betwe...
I am developing an application which will need to store inline, intext metadata. What I mean by that is the following: let's say we have a long text, and we want to store some metadata connected with a specific word, or sentence of the text. What would be the best way to store this information? My first thought was to ...
I know the idea of strong cohesion applies to methods as much it applies to classes. Just to be clear when I say strong cohesion of a method I mean a method which does only one task and does it well. This idea really works for simple getters and setters. But sometimes we usually come across methods that does more than ...
I read from the seminal Code Complete book that method statements that require to be executed in order passing parameter from one to the next is a code smell and is an example of a sequential cohesion. Why is this not a good idea? A contrived example of a sequential cohesion: public Part createPart(input) { Pa...
I have been working on an application alone for several years. I am now asked to transfer knowledge to a few other developers, which I think is a good idea because it will allow us to share the workload. The problem is that I have never been involved in such a process. My manager is asking what I need to facilitate th...
I'm new to the opensource world. The project I'm working on resides on Github. (Just for reference) The project I'm working on is a plug-in for the Plex Media Server. I plan to submit my plug-in to Plex so that it will be included in their "app store". Now to my question. When I first started out, I found an older sem...
I'm a Ruby on Rails developer. I'd like to create a web application. I will let users get a payed subscription to use the product. So I will need a recurring billing system (e.g. via paypal). But there is the fear to fail and make some bad mistakes, because I will handle money from other people.... regardless followin...
My project team is making a site that will use reddit style voting to track users' opinions on various issues, and use the data to create a "heat map". I say heat map in quotes because I'm not sure that it's the correct term - I don't have the math to express it properly. The idea is you'll be able to see, on a 2 dim...
I was wondering what that term even meant. Is it something to do with one's amount of knowledge about the Ruby language or just the plain idea of using it. When can one call themselves a "Rubyist"?
When offering to create a profile (for example, login+pwd) for a web service, what are the best practices one should implement to avoid mass spamming/creation of fake profiles? I am thinking about email confirmation, captchas, etc... any other ideas that work in practice?
I'm trying to figure out a good practice for designing a function with (many) optional components. For a specific example, say I am interested in designing a feature extractor function that takes as input a document and returns a list of features extracted from the document. Question If there are many optional componen...
I'm really struggling to write effective unit tests for a large Django project. I have reasonably good test coverage, but I've come to realize that the tests I've been writing are definitely integration/acceptance tests, not unit tests at all, and I have critical portions of my application that are not being tested ef...
Most issue tracking systems have only single status field. Typical Status: New -> Fixed When code is pushed to repository with commit message "Fixed issue #1234", the issue #1234 is automatically mark as "Fixed". I have the below idea but no system can fulfill. The question is: Am I right or just not finding the suita...
I recently asked a question on StackOverflow that was related to string splitting and pattern matching in .NET. Some beady eyed developers that viewed the question said: "It looks like you're trying to parse a JSON string...why don't you just use JSON.NET or JavaScriptSerializer". The conversation went off at on a tan...
Here's a common scenario for developers who want to integrate static analysis in their workflow. Any suggestions on how to get this working with a minimum of pain? The situation is similar to the one discussed here: http://enterprise-it-solutions.blogspot.dk/2011/02/maven-configure-checkstyle-pmd-eclipse.html The dev s...
Now with gamemaker studio source files are no longer stored in a proprietary format - instead they are stored as simple XML files containing all data. Now I am wondering, can projects created with gamemaker be licensed using an open source license - especially wondering about the GPL and BSD/APACHE families? And if so ...
Edit: As a lot of you have pointed out, efficient can mean a lot of things. I guess when I say that the device 'requires efficient programming', I mean that the device does not have lots of memory or a very high CPU clock rate, and therefore needs to be programmed with these limitations in mind. Original Question: Some...
I'm a writing a small webserver for personal use in c (not c++). I want to allow user input in the console like "shutdown server" or "restart server". In order to allow this kind of input the server is running in a seperate thread (pthreads), so the console isn't blocked. I also want this thread to print output in the ...
I was reading this blog by Joel Spolsky about 12 steps to better code. The absence of Test Driven Development really surprised me. So I want to throw the question to the Gurus. Is TDD not really worth the effort?
I have this old implementation of the Command pattern. It is kind of passing a Context through all the DIOperation implementation, but I realized later on, in the process of learning and learning (that never stops), that is not optimal. I also think that the "visiting" here doesn't really fit and just confuses. I am ac...
Imagine, there is an open-source project with a Maintainer and a Contributor. Both of them have theirs repos exported to some repository hosting (github, bitbucket, sourceforge --- whatever, but they are public). Imagine further, Contributor did several commits, pushed them into his repo and sent pull-request to the Ma...
I've been hired by someone to do some small work on a site. It's a site for a large company. It contains very sensitive data, so security is very important. Upon analyzing the code, I've noticed it's filled with security holes - read, lots of PHP files throwing user get/post input directly into mysql requests and syste...
Let's say I have a not-so-intuitive if statement in my code, but only if you're new to the codebase: def set_markets(markets=None): """ Will accept 'all' as markets to set all markets on. For individual markets, pass in a list of ints. """ if markets: if type(markets) == list: ma...
At my company, I develop and maintain all the operational reporting used by management to run the business. There is no reporting position on the application development team. I've taken it upon myself to step in and attend design review meetings to give input to the development team on how changes will impact report...
Back in the late 90's I worked quite a bit with a code base that used exceptions as flow control. It implemented a finite state machine to drive telephony applications. Lately I am reminded of those days because I've been doing MVC web apps. They both have Controllers that decide where to go next and supply the data t...
I am traditionally a MsSQL or MySQL developer - I have been prototyping a new application that involves storing data from many targets. I have seen that the app appears to get slow after scaling to 10k targets after inputting around 300k results for each (64 bit ints) - especially once I start trying to average and/or...
I think this is a good question for here but I'm not 100% sure. Please flag if it's too vague. I've worked on many websites where common framework classes are overridden. Since I work mostly in .net these days examples would include Page, Masterpage, UserControl, DbContext ect. I believe this could apply to any langu...
I'm exploring a piece of code in Architecture Explorer in Visual Studio 2010 to study the relations between methods. I noticed a strange behavior. Take the following source code. It generates a hello message based on a template and a template engine, the template engine being a method (a sort of strategy pattern simpli...