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This is one of the questions given to us an assignment and I've tried to search for this on the internet but didn't get the required answers. Would be great if examples are provided too :)
I am currently acquiring my associates degree in software engineering. I have been told in order to be successful in a computer science field you have to specialized in something. After researching several areas I have decided I want to specialize in Java Database Connectivity. It earns a decent income and seems intere...
I've collected a bunch of interview questions like "Describe how you would design a photo album application", "Describe how you would design this particular feature of this particular website" (e.g. likes on Facebook, recommendation on Amazon, shopping cart, game of black jack). Then, what if there are millions of this...
I am looking for a way to control large amounts of JavaScript code in a ASP.Net MVC web application. I have been looking at Ember.js and whilst it's pretty compelling it takes control of the routing and as such treats the server as little more than a place from which to receive API calls. This isn't really useful for w...
I am currently working on a C# ASP.Net 3.5 website I wrote some years ago which consists of a "main" public site, and a sub-site which is our customer management application, using forms-based authentication. The sub-site is set up as a virtual folder in IIS and though it's a subfolder of "main", it functions as a sepa...
To make things simple to explain: I've got two tables: Table1 and Countries. The Countries table contains a nice flag and some information, such as DisplayName, the ISO3166 ALPHA3 code and the phone code (+49, +xx). Table1 contains customers with a column Country. Is it (in terms of usability, normalization and common ...
So I am working on a small Project at my company, I am a mere trainee engineer (halfway through a Software Engineering degree), where we are developing an intranet - based project management and people management system - it incorporates Employee appraisals, personal skill management and development and so on. Ive been...
Many projects on Github comprise a LICENSE file, usually looking like: Copyright (C) 2012-2013 Mr. Creator Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without li...
I'm in a team where I am the only Java developer. The rest of the team are VERY experienced in their own programming language, but their area of expertise is not object orientated. I found the first time that I had a code review, it was a lengthy process that involved a lot of tangents about how Java works, or how OOP...
I am going to write an application that reads data from a csv file, and display that data to the user. I intend to apply an MVC design pattern to create this application. A user will interact with this application through a console. Hence the view is a console. There will be a Main.java that is responsible for : Pre...
I'm currently refactoring a part of a large codebase with no unit tests whatsoever. I tried to refactor code the brute way, i.e. by trying to guess what the code is doing and what changes wouldn't change it meaning, but without success: it randomly breaks features all around the codebase. Note that refactoring includes...
I don't hate using assembly language, since I have written some in my os course. But obviously, assembly language lacks abstraction, you have to pay more attention to the details. Is assembly language really essential to write TAOCP?
I'm trying to figure out a way to capture the system audio of an Android and/or Windows Phone. The idea is to provide a stream based on the music I'm currently playing on my phone. What I'm not sure about is what the best approach would be for sending the audio. Preferably I'd like to capture all the device audio (same...
I know, I know -- it isn't possible presently but my question is this: Would it be possible to write a browser plug in for the major browsers that enables true, multi-threaded JavaScript? It just seems like this would be possible and, if so, it would take the web (not to mention JavaScript) to new heights.
My organization is moving to Agile process of software development. As part of it, the developers and quality engineers will sit together with the cubicle walls scaled down. I am just wondering how does it satisfy one of the Joel's test - programmers should have quiet working conditions. Does it not contradict it? If ...
A person I met recently had an argument. It was that a programming language had to be compiled to be considered a programming language. This would make HTML/CSS (unless you're using SCSS or LESS) not a programming language. So, does it have to be compiled?
Let's say I am selling hardware that uses the linux kernel. Do I have to state somewhere that it is running linux(or other gpl code)? The reason I am asking this is because I bought a television, which I found out is running linux. It doesn't say anywhere it is running linux, which seems to me a violation of gpl. If th...
Explanation First let me briefly define how I'm using terms (I might be bending their typical use a little): When I talk about semantic breaking changes, I'm referring to a change in the meaning/behavior of a public API. It may require changes to consumer code, but it isn't immediately obvious, since nothing 'broke'. C...
We're developing a site where individuals (store owners) will be able to take pictures and upload to the site. Our biggest concern is the variance in quality of pictures across the site. The options we are considering are: Minimum image cleaning scripts (including filters, resizing, sharpening, etc.) Approval process...
With advent of WPF and MVVM Microsoft introduced DependencyProperties and INotifyPropertyChange interface to provide a way to implement the "reactive" approach used with those technologies. Sadly both of these constructs are very verbose, require much boilerplate, are clumsy to use, also are not really that safe since ...
I'm wanting to get an assembly book to learn assembly, and was wandering if i get a book for intel x86 processor will there be any problems assembling the code on an amd processor?
I have a model called Car and depending on what type of Car the user select the view is presented differently. For example the user selects from a grid of different cars and depending if it is a Volvo or a Kia or a Ford the view must allow different fields to be editable. For example with a Volvo the color is editable ...
It's pretty easy to track when we fix security vulnerabilities in existing code. But to make sure the whole team is staying on their toes about writing secure code, I'd like to also track how well we are preventing and avoiding writing new security vulnerabilities. What is the right way to measure that?
I faced a question in a .NET interview. As a client i need a LoggingAPI. How you go the approach of design and development and delivering Logging API to the client? I don't care about WPF or a language specific. I want a LoggingAPI which has to log some data? what is your approach in delivering the same. I failed to an...
In this MSDN Magazine article Peter Vogel describes Extension Objects pattern. What is not clear is whether extensions can be later implemented by client code residing in a separate assembly. And if so how in this case can extension get access to private members of the object being extended? I quite often need to set d...
Well this has been a question I have puzzled about for a long time: Suppose I have a dictionary of input:output like: This {2: 6, 5: 15, 20: 60, 26: 78, ... 982: 2946, 997: 2991} where output = input*3. or This {0: 5, 3: 8, 17: 22, 19: 24, ... 991: 996, 996: 1001} where output = input+5 or something els...
I am developing a commercial application. There are several programs under GPL which have some common features with my planned applications. Can I take ideas from those applications under GPL and implement them myself without copying the code? Would this violate the GPL?
Apologies for the long post... Where I work we have a system with many subsystems which are located in different locations. All the subsystems process some data and write the result on A database. In case any other subsystem needs the output f other subsystems it gets connected to the database and read from it. And tha...
I apologise in advance if this question is too subjective but I'm struggling to find a good answer, probably as there is not really a correct answer to give. I'm currently writing a database abstraction layer to unify the use of a single API throughout my applications. Possibly re-inventing the wheel but I'm mainly doi...
I want to use a dictionary (basically a text file, and no code) that is included with an open office spell checking plug-in. The plug-in is under the tri-license GPL/LGPL/MPL which I don't understand. is that legal? If it is illegal, what if I wrote a script that uses the said open office plug-in to generate the dictio...
I see myself using more and more immutable types when the instances of the class are not expected to be changed. It requires more work (see example below), but makes it easier to use the types in a multithreaded environment. At the same time, I rarely see immutable types in other applications, even when mutability woul...
I'm writing a program to automatically make the draw for a competition. There are four objects: Debate Judge School Team Each Debate has two teams and a judge. Each team participates in three debates. With this, there are the following rules: 1) A team cannot face someone from their same school 2) A team cannot face a...
I've read it at many places that unit tests should be independent. In my case I have a class that does data transformation. These steps must be done sequentially, otherwise they don't make sense. For example, load_data parse_float label normalize add_bias save_data For example, I cannot normalize the data before I lab...
I'm writing an application that deals with the network and the hard drive. For the network portion, the application measures in bits per second, while the disk portion measures in bytes per second. This becomes an issue as they both are abbreviated b/s or bps everywhere I've seen. How could I inform the user that one m...
I am building an application which, at the moment, consists of many small Python scripts. Each Python script processes items from one Amazon SQS queue. Emails come into an initial queue and are processed by a script, and typically the script will do a small unit of processing (for example, parse email and store some da...
I've read about the "hypervisor" in hardware virtualization. VMs are not my area, so I can't quite see where the term came from. THe wikipedia article talks about how "the hardware's supervisor state was virtualized as well, allowing multiple operating systems to run concurrently in separate virtual machine contexts" ...
As from March 2013, Microsoft allows Adobe Flash content to play by default on its immersive Internet Explorer 10: http://redmondmag.com/articles/2013/03/11/new-ie-10-flash-policy.aspx When asked about Silverlight, Microsoft says Silverlight will not be supported in immersive Internet Explorer 10 since these capabili...
I'm a bit confused if saving the information to session code below, belongs in the controller action as shown below or should it be part of my Model? I would add that I have other controller methods that will read this session value later. public ActionResult AddFriend(FriendsContext viewModel) { if (!Mode...
I am a student and a freelance programmer. These days I am developing a software in VB6 which has recently crossed 100KB of source code. The main problem, I face is, many times I have to refactor my existing source code which is really very boring. Also the size of my code base is not very big (only 100KB). What are th...
The consensus seems to be that one should follow the convention of the platform they're developing for. See: Underscore or camelcase? Naming conventions: camelCase versus underscore_case? However, PHP doesn't seem to strictly follow any convention internally (no surprises there), even for methods and functions (e.g. my...
Our product registers new players on our service, and we've chosen to host it on Azure (we're using .NET) and we wanted it to be stateless (for scalability) and relatively secure. Since this is the first REST WS I'm writing, I wanted to get some feedback on whether or not it's a solid solution. Some presumptions to kno...
I need to build a web service API for our mobile app to interact with our server & database (in ASP.Net MVC 4, but that's hardly relevant). Wile most actions do not need users to be registered with our service, we would like to restrict access only to users of our app. What are the methods to make sure that calls made...
The question is - what is an effective way to deliver files to users? Consider an asp.net application which gives an ability to view various files. A kind of image library or web file directory. Key points are: user can upload arbitrary files of size <= 10Mb files are stored on disk files never change user can remove ...
I have seen many answers in SO regarding using Google's CDN to load jQuery instead of loading it from the local server. In essence I understand this is the issue related with decreased latency, better caching. But I want to know the technical answer, perhaps an example mentioning why it is even an issue to just load a...
I'm looking to write a program that will generate valid sudoku puzzles. Essentially, a sudoku puzzle is just an 81 digit number. (The blanks are zeroes.) I would then like to use these puzzles in an Android app. Is there any risk to using randomly generated puzzles in an app? If another app has the same puzzle, am I...
I'm a CS student and I have been coding for a few months shy of a year now, and I seem to have developed what I think may be a "bad" habit and I'm wondering if anyone does the same (or whether it's a bad habit at all). When I'm coding / solving a problem with code, I find that my initial implementation is lengthy and o...
We have a project that keeps recurring. The client expects us to run a website twice a year and this is happened for the last year and a half. I took the last working copy and based our latest website on it. Now, a co-worker has suggested that next time we should start from scratch instead of fighting against legacy co...
Let's say I have a set of items {e1, e2, ..., en}, and I also have a set of constraints {c1, c2, ..., cm}, with ci := ej appears before ek, for some j and k. I want to produce an ordering of my items which maximizes the number of satisfied constraints, with the possibility that some of the constraints are contradictory...
i am working on a project consisting of sending and receiving streaming multimedia.So,i have installed JMF, but i have seen that JMF has 32 bit library as mine is 64 bit so i wanted to use Xuggler for streaming videos. Can anyone clarify me about the support of Java Media FrameWork with Xuggler..
I was looking through some Objective C docs.. and got this : UIGraphicsBeginImageContext : Creates a bitmap-based graphics context and makes it the current context. Also, the same term is used in Robotlegs : (http://www.adobe.com/devnet/actionscript/articles/intro-robotlegs-pt1.html) Context: Context is the boo...
I need to implement some graph partitioning algorithms for my thesis. I have mostly Windows experience. I would like to know if it is hard to migrate c++ console program to Linux. I want to program it on Windows but I want to test and compile it on Linux as well. It will be pure cli application, with no use of windows ...
I'm writing an InputStream that processes data streams containing "trailer" data. That is, the final n bytes of the stream is a piece of data that must be handled separately and shouldn't be returned from the read methods. My class will maintain an internal byte array of length n and read data into this byte array fro...
So I'm planning to use APIs for my host app. But the APIs are built such that it requires a sessionkey for every request. So my question is, how would I dogfood my API? Cause, apparently I'm thinking in the line of creating a "special" key for my host app (cause it makes no sense to request for a key for my own use), b...
I have a fairly new C# application, approximately 6 months old, that we are now trying to incorporate testing into. (Should have been done from the start but I can't change the past) Parts of this application involve pushing some documents out to a folder. A third party application then picks these up, does its own wor...
I have a large module which have to process more than 10k request/ response per second. Every request has a json and need to process it and verify it on the database and generate the response on the basis of the db query. Here is an example Function 1 function ('/get' , fucntion (req1 , res1 , next ){ //to proce...
Now, when I make a programming mistake with pointers in C, I get a nice segmentation fault, my program crashes and the debugger can even tell me where it went wrong. How did they do that in the time when memory protection wasn't available? I can see a DOS programmer fiddling away and crashing the entire OS when he made...
We are currently designing a REST API to access classical customer data. One of the elements in the API are the assets of an user. The assets are added under a given service. The backend API will only add an asset to an user under a given service. So, there's no User--Asset relation, but a User--[Service]--Asset rela...
Preamble My aim is to create reusable code for multiple projects (and also publish it on github) to manage subscriptions. I know about stripe and recurring billing providers, but that's not what this module is aiming for. It should just be a wrapper/helper for calculating account balance, easy notifications to renew a ...
I am trying to broaden my understanding of the history and development of object-oriented programming, and I am curious to find out if C was designed to facilitate Object-Oriented programming? (like C++ and Objective-C definitely are) or if it was, on the contrary, simply just a clever exploitation of the language's c...
The problem Let's say I have a class called DataSource which provides a ReadData method (and maybe others, but let's keep things simple) to read data from an .mdb file: var source = new DataSource("myFile.mdb"); var data = source.ReadData(); A few years later, I decide that I want to be able to support .xml files in a...
I have a number of objects storing state. There are essentially two types of fields. The ones that uniquely define what the object is (what node, what edge etc), and the others that store state describing how these things are connected (this node is connected to these edges, this edge is part of these paths) etc. My...
In this blog post about acceptance criteria the author explains that good acceptance criteria should: State an intent not a solution (e.g. “The user can choose an account” rather than “The user can select the account from a drop-down”) Are independent of implementation (ideally the phrasing would be the same regardles...
I'm looking to refactor an existing design; to move a bunch of stuff out of a database and into memory where it should be (There are many reasons the DB approch is dangerous as it is now). My first act was to take all the existing objects and expand more state to them. The previous objects new only their parents, and...
If you had a manager, a couple of levels above you, tell you that building software is like building a bridge, how would you respond to that? If this manager truly believes that we should be able to accurately estimate and build a system, what good metaphors are out there to explain why this isn't the case?
I'm going to develop a fairly basic re-usable blog component, with simple CRUD operations using ASP.Net. Which method of storing blog posts would be best suited to the situation in terms of performance/maintainability? Create an XML file and store data in filesystem, filesize will not likely be any more than 50kb in s...
I'm implementing a Windows 8 app using C#, part of it is One Way Chat. It will be for multiple users such as teacher and student. We want to use a chat room for every course. Teachers teach different courses that include many students and students study different courses, so when the teacher and student open the course...
I have an SQL query which does several things at once¹: it does multiple checks and then, if the checks pass, updates some data. Without entering in the domain-specific details, here's an imaginary example: -- The user password should be updated only if the user account is not removed and -- not locked, and the thresho...
A few times in my past I've wanted to store data in code. This would be data that seldom changes and is used in places where access to a database isn't possible, practical, or desirable. A small example would be storing a list of countries. For that you could do something like: public class Country { public string ...
So I have been building this ORM style library for AngularJS (JavaScript) and since I come from a C++/PHP/C# background, I always try to make sure that private things stay private. While this can be accomplished in JavaScript, I keep running into issues that I have to work around probably because JavaScript really doe...
After reading Applying UML and Patterns (Larman) and looking around on the Internet it still seems ambiguous to me if a UML communication diagram should depict implementation details (such as GUI related function calls) or be more bound to the analysis. What is the correct answer? Does UML even specify it?
So I have a generic framework with a concept of children and parent objects, the objects don't have to be the same type, and I can add or remove any of them. Adding calls add on all the children, and informs the parents, inverse for remove. the concept of Parent is generic enough that there can be a loop across classe...
I have a list of objects that all require the exact same filtering, basically a set of conditionals in a function which outputs if the object is "good" or "bad". I want to keep all of my "good" objects in the list. Lets say I have 1000 objects in this list and the function I want to filter on in written. What langua...
I am working on a CMS that is starting to evolve a bit. We started off with content that had the following priorities ( columnn in the db on the content table): HIGH MED LOW. Data was fetched by priority HIGH being on top etc. Now after a few months a need has risen to have sub priorities: HIGH [ high, med , low ], M...
I was reading this article: Designing Flags Enumerations @ msdn and it says Combining flags enumeration values is an intermediate skill that should not be required for developers implementing common scenarios. I think flags enumeration are awesome - something I learned about during my experience with C. Why does it s...
Before asking my question, I must explain the situation. I'm working for a company as a junior software engineer. One of the seniors always stops me when I have finished my development and want to commit. He always wants me to wait for him to review it. This is ok, because usually he finds some bugs, and does some opti...
I have an abstract class A which declares an abstract method doStuff. Currently there are many classes that inherit from A and implement doStuff. The class' instances are initialized at run-time via AFactory based on user input. Originally all the classes had the same single parameter (the user input). But now I have...
I can see that GitHub allows you to have multiple mail account and associate every organization you are part of with a different address. Can this be done also for SSH keys? What I would like to do is having two different keys, one to push on my private repository, another to push on an organization repository.
When working on code, I face many of the same challenges that my teammates do, and I have written some helpful functions and classes, and so have they. If there is good communication, I'll hear about some great thing someone put together, and six months later when I need it I may remember it and call that function, sav...
I want to know how exactly, we can ensure that a project is 100% tested ? In banking or financial applications not 1% also tolerable. So being a developer, how can you say your code is 100% tested? Explanation with example is highly appreciated.
I work in a team that keeps growing. However, there are no code reviews and I see this as a problem every day. There are people with really limited skills committing code to our repository that I believe should not commit. I'm not the team leader nor am I in a management position. I already proposed code reviews abou...
It seems like Python, PHP, and Ruby all use the name "argv" to refer to the list of command line arguments. Where does the name "argv" come from? Why not something like "args"? My guess is that it comes from C, where the v would stand for "vector". Wikipedia has a footnote that says: the vector term in this variable's...
I'm not necessarily asking if a NoSQL database can be ACID compliant, which has been asked here: Is there any NoSQL that is ACID compliant? I'm wondering if we have a database either now or in the future that is wanting or is another option to a traditional RDBMS? I know NoSQL was supposed to be the big thing and RDBMS...
When I first came to OOP (at first in Java, and then C++) after years of working in C and VB, it was amazing. The idea of extending existing behaviour and operating generically over things of related types was very appealing, and I almost immidiately saw why it was that I wanted this. That is, my motivation for OOP w...
For those who have sold software successfully over the Internet, after going to the effort of writing the software, creating a website, get a domain name, hosting the website, setting up a merchant facility, creating a trial version, etc - what do you do about the legal aspect of allowing the version downloaded from th...
I work for a large bureaucratic (and security paranoid) organisation that provides SVN for its development teams to use. I am working with a 3rd party vendor (at their site) and we currently share code via SVN export and patch files. The only way I have for transferring files is by a FTP drop box or email. I would lik...
I often feel that it would be more convenient if, within an issue tracking system, each issue were attributed to a certain function/method. Then, we can easily list all the issues related to a certain function/method. Many issues can be clearly attributed to a certain function/method. At times, we may want to look at i...
I work in a control systems company, where the primary work is SCADA and PLC, along with other control systems stuff. Software development is not really something the company does, apart from little bits here and there, until there was a decision to create an internal project management and appraisal system. This proje...
I started with sftp, then switched to WebDAV and I'm currently using rsync through ssh to deploy any updates/upgrades from my development server into my production server. I'm still not very happy using this system and think using git to deploy may be better, mainly because of the possibility of rolling back any change...
I am currently a reviewer on a Best Practices document for Developers or Business Analysts in writing a Functional Requirements document. This document is not necessarily a template for functional requirements documents, but a guide to what elements are necessary, optional, and dangerous to include a Functional Requir...
I have a Java HashMap with a String key and POJO value in a long-running application, and it's taking up a large chunk of memory (over 500mb, and this number is expected to grow - I'm guesstimating that it will exceed 2GB in two to three months); this is used to memoize the results of an expensive calculation (typicall...
These days there are more cross programming language compilers (specially from some 'X' language to JavaScript). I wonder how these are developed? What are the general steps to be taken care to write algorithms if I were to develop one? Do I need to be completely thorough in Lexical Analysis? As far as my knowledge is ...
Let's say I have 4 (A,B,C,D) parameters with 3 possible values, also 81 unique combinations. With e.g. orthogonal array, I will end up with 9 test cases, each combining 3 pairs. But that means that if one test case fails, I do not know which combination in the test case is faulty, right? Whether values of A,B or A,C or...
Let's have a program that checks an email mailbox and then "processes" the messages contained there. (For this question it doesn't really matter what it actually does with the message). The program will run once per hour and can easily handle the volume of new messages and there is no penalty for processing a message t...
Can anyone help me think of a way to dynamically generate the patterns section of a tool I am creating? I'm not sure how to store and generate these "patterns" dynamically. What the program does is take a big list of links (100,000), puts them in a database, groups them by domain and then curls a page from each domain ...
I've been thinking a lot about best practices regarding branching in distributed version control systems such as git an mercurial (the two dvcs's I have experience with and use on a daily basis). The way I've been doing it is slightly different in each of these, but generally follows these guidelines: master branch - ...
I hope this is not off topic. I have to save output from a command to file, but only if length of this output is positive. I've thought about two solutions: save output to a python variable, check length, if positive save to destination file; save output to a temporary file, check length, if positive rename to destina...
Please tell me why the same piece of code behaves differently in C++ and JAVA. Ok first I implement a function to calculate the factorial of an Int RECURSIVELY In JAVA: int f(int x) { if(x==1)return 1; return(x*f(x-1)); } System.out.println(f(5)); -----> outputs 120, ok that makes sense. JAVA ...
I'm starting a side project, the first stage will be a building a web application with MVC, in later stages we will be adding clients for mobile platforms. My thought was to create one API that all of the applications (web and mobile) go through to get/save data. Because these different platforms will be on different ...
A customer asked me to add a (fairly generic monitoring and notifications) functionality to the in-house solution he has assembled on top of JBoss and couple of GPL-licensed components (downloadable from the open source vendor as EARs). I am using JMS and JMX to communicate with these components. Do I have to provide t...
The first part of the license implies you can do basically whatever you want with it (copy, modify, sell etc). But the second part says that these freedoms must propagate into all copies of the software. My interpretation of that is, you can incorporate the software into your proprietary project, but that portion must...

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