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  • How do you prefer to handle image spriting in your web projects?

    - by Macy Abbey
    It seems like these days it is pretty much mandatory for web applications to sprite images if they want many images on their site AND a fast load time. (Spriting is the process of combining all images referenced from a style sheet into one/few image(s) with each reference containing a different background position.) I was wondering what method of implementing sprites you all prefer in your web applications, given that we are referring to non-dynamic images which are included/designed by the programming team and not images which are dynamically uploaded by a third party. 1. Add new images to an existing sprite by hand, create new css reference by hand. 2. Generate a sprite server-side from your css files which all reference single images set to be background images of an html element that is the same size of the image you are spriting once per build and update all css references programmatically. 3. Use a sprite generating program to generate a sprite image for you once per release and hand insert the new css class / image into your project. 4. Other methods? I prefer two as it requires very little hand-coding and image editing.

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  • Will LAMP meet the following needs?

    - by Telis Duvoir
    I remember a few years back, when I had a web-site I wanted to develop, that many people recommended I go the LAMP route. Unfortunately, I never got around to studying/practicing that. I'm currently revisiting the web-site idea. The web-site will be dynamic, transactional, and hopefully end up with around 1,000,000 pv/mo and 300,000 members within 18 months. Will LAMP adequately support a site like that (i.e. have you seen it under a site with those specs)?

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  • In the Aggregate: How Will We Maintain Legacy Systems?

    - by Jim G.
    NEW YORK - With a blast that made skyscrapers tremble, an 83-year-old steam pipe sent a powerful message that the miles of tubes, wires and iron beneath New York and other U.S. cities are getting older and could become dangerously unstable. July 2007 Story About a Burst Steam Pipe in Manhattan We've heard about software rot and technical debt. And we've heard from the likes of: "Uncle Bob" Martin - Who warned us about "the consequences of making a mess". Michael C. Feathers - Who gave us guidance for 'Working Effectively With Legacy Code'. So certainly the software engineering community is aware of these issues. But I feel like our aggregate society does not appreciate how these issues can plague working systems and applications. As Steve McConnell notes: ...Unlike financial debt, technical debt is much less visible, and so people have an easier time ignoring it. If this is true, and I believe that it is, then I fear that governments and businesses may defer regular maintenance and fortification against hackers until it is too late. [Much like NYC and the steam pipes.] My Question: Do you share my concern? And if so, is there a way that we can avoid the software equivalent of NYC and the steam pipes?

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  • Is my use case diagram correct?

    - by Dummy Derp
    NOTE: I am self studying UML so I have nobody to verify my diagrams and hence I am posting here, so please bear with me. This is the problem I got from some PDF available on Google that simply had the following problem statement: Problem Statement: A library contains books and journals. The task is to develop a computer system for borrowing books. In order to borrow a book the borrower must be a member of the library. There is a limit on the number of books that can be borrowed by each member of the library. The library may have several copies of a given book. It is possible to reserve a book. Some books are for short term loans only. Other books may be borrowed for 3 weeks. Users can extend the loans. 1. Draw a use case diagram for a library. 2. Give a use case description for two use cases: • Borrow copy of book • Extend loan Diagram: Use case description: 1. Borrow a copy of the book: If the person wishes to borrow a book from Derpville Public Library, he/she must be a member of the library in which case they will be allowed to issue a certain number of books. If the person is not a member, the book will not be issued to them for taking away, rather they will have to sit and read in the library. 2. Extending loan: Some books will be lent for 3 weeks while others will be lent for more than 3 weeks in which case the person borrowing has to come to the library and get the date extended. There is a limit on how much the user can extend the date of a particular book.

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  • File Upload Forms: Security

    - by Snow_Mac
    SO I'm building an application for uploading files. We're paying scientists to contribute information on pests, diseases and bugs (for Plants). We need the ability to drag and drop a file to upload it. The question becomes since the users will be authicentated and setup by us, will it be necessarcy to include a virus scanner to prevent the uploading and insertition of malicious files. How important is this?

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  • What should be the architecture of an urban game system?

    - by pmichna
    I'm going to develop an urban game using a telco API for phone geolocation and sending/receiving messages. A player would pick up one of the scenarios, move around the city and when he hits a given location, he gets a message and possibly has to answer it. I'm wondering, what approach would be the best in my case. I came up with this general idea: Web application as a user interface (user registration, players ranking, scenarios editing) written in Ruby on Rails. Game server (hosting games, game logic like checking players location, sending and receiving messages) written in Ruby. Database (users, scores, scenarios etc.), probably MySQL or someother open source DB. I want to learn Ruby and RoR, that's why I chose these language and framework. Do you think it's a good choice for a game server? Another question: is this project division good? I mean, I have little experience with Ruby and Rails - that's why I'm asking. Maybe it's better to have web application merged with game server and somehow have the server hosting RoR application do the tasks like mobile phone pinging and message sending? How would that be performed? Maybe this is worth mentioning: the API is RESTful, most results are JSON, few are XML.

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  • Next in Concurrency

    - by Jatin
    For past year I have been working a lot on concurrency in Java and have build and worked on many concurrent packages. So in terms of development in the concurrent world, I am quite confident. Further I am very much interested to learn and understand more about concurrent programming. But I am unable to answer myself what next? What extra should I learn or work on to inherit more skills related to Multi-core processing. If there is any nice book (read and enjoyed 'concurrency in practice' and 'concurrent programming in java') or resource's related to Multi-core processing so that I can go to the next level?

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  • Is this kind of design - a class for Operations On Object - correct?

    - by Mithir
    In our system we have many complex operations which involve many validations and DB activities. One of the main Business functionality could have been designed better. In short, there were no separation of layers, and the code would only work from the scenario in which it was first designed at, and now there were more scenarios (like requests from an API or from other devices) So I had to redesign. I found myself moving all the DB code to objects which acts like Business to DB objects, and I've put all the business logic in an Operator kind of a class, which I've implemented like this: First, I created an object which will hold all the information needed for the operation let's call it InformationObject. Then I created an OperatorObject which will take the InformationObject as a parameter and act on it. The OperatorObject should activate different objects and validate or check for existence or any scenario in which the business logic is compromised and then make the operation according to the information on the InformationObject. So my question is - Is this kind of implementation correct? PS, this Operator only works on a single Business-wise Operation.

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  • Pros and cons of using Grails compared to pure Groovy

    - by shabunc
    Say, you (by you I mean an abstract guy, any guy in your team) have experience of writing and building java web apps, know about filters, servlet mappings and so on, and so on. Also, let us assume you know pretty well any sql db, no matter which one exactly, whether it mysql, oracle or psql. At last, let pretend we know Groovy and its standard libraries, for example all that JsonBuilder and XmlSlurper stuff, so we don't need grails converters. The question is - what are benefits of using grails in this case. I'm not trying to start flame war, I'm just asking to compare - what are ups and downs of grails development compared to pure groovy one. For instance, off the top of my head I can name two pluses - automatic DB mapping and custom gsp tags. But when I want to write a modest app which provides small API for handling some well defined set of data, I'm totally OK with groovy's awesome SQL support. As for gsp, we does not use it at all, so we are not interested in custom tags as well.

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  • Does Sublime's "minimap" improve productivity?

    - by Casey Patton
    I'm a pretty big fan of Sublime. One of my favorite features is the ability to scroll through your file by using the compressed image of your text on the upper right hand corner (minimap). My gut feeling is this does positive things for productivity: Does having this minimap to scroll through actually improve productivity? P.S. - Side question: Did Sublime invent this idea, or did they take it from another text editor?

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  • Naming methods that do the same thing but return different types

    - by Konstantin Ð.
    Let's assume that I'm extending a graphical file chooser class (JFileChooser). This class has methods which display the file chooser dialog and return a status signature in the form of an int: APPROVE_OPTION if the user selects a file and hits Open /Save, CANCEL_OPTION if the user hits Cancel, and ERROR_OPTION if something goes wrong. These methods are called showDialog(). I find this cumbersome, so I decide to make another method that returns a File object: in the case of APPROVE_OPTION, it returns the file selected by the user; otherwise, it returns null. This is where I run into a problem: would it be okay for me to keep the showDialog() name, even though methods with that name — and a different return type — already exist? To top it off, my method takes an additional parameter: a File which denotes in which directory the file chooser should start. My question to you: Is it okay to call a method the same name as a superclass method if they return different types? Or would that be confusing to API users? (If so, what other name could I use?) Alternatively, should I keep the name and change the return type so it matches that of the other methods? public int showDialog(Component parent, String approveButtonText) // Superclass method public File showDialog(Component parent, File location) // My method

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  • How do you get positive criticism on your code?

    - by burnt1ce
    My team rarely does code review, mainly because we don't have enough time and people lack the energy and will to do so. But I would really like to know what people think about my code when they read it. This way, I have a better understanding how other people think and tailor my code accordingly so it's easier to read. So my question is, how do I get positive criticism on my code? My intent is to understand how people think so I can write more readable code.

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  • What is the current "standard" for setting up a development environment that supports remote collaboration as well as secure version control?

    - by Andrew
    What is the current "standard" for setting up a development environment that supports remote collaboration as well as secure version control? Considering a virtual dedicated solution with vm for a web layer and a data layer, using VPN for each programmer. We're a small start-up that do both Microsoft and open-source development. Is there a set software tools or packages that are appropriate for a small shop and yet scalable? Thanks.

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  • Why do people hesitate using Python 3?

    - by Ham
    Python 3 has been released in December 2008. A lot of time has passed since then but still today many developers hesitate using Python 3. Even popular frameworks like Django are not compatible with Python 3 yet but still rely on Python 2. Sure, Python 3 has some incompatibilities to Python 2 and some people need to rely on backwards-compatibility. But hasn't Python 3 been around long enough now for most projects to switch or start with Python 3? Having two competiting versions has so many drawbacks; two branches need to be maintained, confusion for learners and so on, so why is there such a big hesitation throughout the Python community in switching to Python 3?

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  • Non-language-specific interview questions for a senior web developer

    - by Songo
    I came across a job posting for a senior web developer position. The posting said that the development will be done using Ruby on Rails, but no prior knowledge is required. I confirmed with a contact in that company that a PHP web developer can apply for it or even an ASP.Net developer. I also confirmed that the interview won't contain any questions specific to PHP or Ruby on Rails. Can anyone please provide a good list of questions for a senior web developer that isn't specific to a certain language? Note This question isn't a duplicate for similar posts asking for questions relating to PHP, .Net or Ruby. Also, I'm not looking for topics to learn as a web developer, but rather interesting questions for a technical interview given the former conditions.

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  • How to make a system time-zone sensitive?

    - by Jerry Dodge
    I need to implement time zones in a very large and old Delphi system, where there's a central SQL Server database and possibly hundreds of client installations around the world in different time zones. The application already interacts with the database by only using the date/time of the database server. So, all the time stamps saved in both the database and on the client machines are the date/time of the database server when it happened, never the time of the client machine. So, when a client is about to display the date/time of something (such as a transaction) which is coming from this database, it needs to show the date/time converted to the local time zone. This is where I get lost. I would naturally assume there should be something in SQL to recognize the time zone and convert a DateTime field dynamically. I'm not sure if such a thing exists though. If so, that would be perfect, but if not, I need to figure out another way. This Delphi system (multiple projects) utilizes the SQL Server database using ADO components, VCL data-aware controls, and QuickReports (using data sources). So, there's many places where the data goes directly from the database query to rendering on the screen, without any code to actually put this data on the screen. In the end, I need to know when and how should I get the properly converted time? There must be a standard method for this, and I'm hoping SQL Server 2008 R2 has this covered...

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  • When does 'optimizing code' == 'structuring data'?

    - by NewAlexandria
    A recent article by ycombinator lists a comment with principles of a great programmer. #7. Good programmer: I optimize code. Better programmer: I structure data. Best programmer: What's the difference? Acknowledging subjective and contentious concepts - does anyone have a position on what this means? I do, but I'd like to edit this question later with my thoughts so-as not to predispose the answers.

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  • Best Software Development Methodology Environment for Fresh Graduates

    - by newbie
    I am looking online for IT-related jobs and most of the time, they are indicating the need that the candidate must have an experience in certain software development methodology (SCRUM, RAD, Waterfall, Agile, etc). Truly, different companies have different needs. What do you think is the best environment / software development methodology for a fresh graduate to be part of so that they could really be a good programmer? What will be avoided?

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  • Is there a pattern or best practice for passing a reference type to multiple classes vs a static class?

    - by Dave
    My .NET application creates HTML files, and as such, the structure looks like variable myData BuildHomePage() variable graph = new BuildGraphPage(myData) variable table = BuildTablePage(myData) BuildGraphPage and BuildTablePage both require access data, the myData object. In the above example, I've passed the myData object to 2 constructors. This is what I'm doing now, in my current project. The myData object, and it's properties are all readonly. The problem is, the number of pages which will require this object has grown. In the real project, there are currently 4, but the new spec is to have about 20. Passing this object to the constructor of each new object and assigning it to a field is a little time consuming, but not a hardship! This poses the question whether it's better practice to continue as I have, or to refactor and create a new static class for myData which can be referenced from any where in my project. I guess my abilities to use Google are poor, because I did try and find an appropriate pattern as I am sure this type of design must be common place but my results returned nothing. Is there a pattern which is suited, or do best practices lean towards one implementation over another.

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  • Where can I start learning to build web applications in C#

    - by Carson Myers
    So far I've written web sites in PHP, except for a pet project of mine written in Python. I'd like to start learning C# for use on the web, but I have no idea where to start. I know nothing of .Net. Are there any good tutorials or online books etc. which give a brief intro to the .Net environment (specifically C#, and specifically for the web)? I'm not even sure what I need to install. Visual Studio I guess, but what else? Anything special, or will VS do the trick?

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  • How to represent a tree structure in NoSQL

    - by Vlad Nicula
    I'm new to NoSQL and have been playing around with a personal project on the MEAN stack (Mongo ExpressJs AngularJs NodeJs). I'm building a document editor of sorts that manages nodes of data. Each document is actually a tree. I have a CRUD api for documents, to create new trees and a CRUD api for nodes in a given document. Right now the documents are represented as a collection that holds everything, including nodes. The children parent relationship is done by ids. So the nodes are an map by id, and each node has references to what nodes are their children. I chose this "flat" approach because it is easier to get a node by id from a document. Being used to having a relation table between nodes and documents, a relation table between nodes and children nodes I find it a bit weird that I have to save the entire "nodes" map each time I update a node. Is there a better way to represent such a data type in NoSQL?

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  • What's the best Open Source code you've ever seen?

    - by Andrew Theken
    Part of the value of Open Source is to provide great example code to people getting started with a new platform or language. What's the best Open Source code you've encountered, and why do you like your choice? Any language will do, but I'm particularly interested in the best examples of Objective-C you can point out. Obviously this is an open-ended question, so I'll leave the question open for a while and see what kinds of answers we get. Thanks!

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  • Most popular Open-Source License on github?

    - by John R
    This is a two part question: 1) What is the most popular Open-Source License used by developers on github? 2) Assuming people follow the rules - will this license (the most popular on github) assure that my name is always associated with the project - regardless of how it forks or is picked up elsewhere. The reason I ask is I have not yet used github nor released an open source project. My main incentive for releasing a particular project is to develop a name for myself and improve my resume. I have a lot of reading to do, but I suspect that knowing the most popular licensing schemes will reduce my reading and my learning curve.

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  • using cin and cout in textmate [migrated]

    - by That Guy
    I am usually a Java programmer, and have used textmate for that almost exclusively, but lately I started using C++ with it. but when i use even the most basic programs and incorporate the cin keyword, and run the program, I dont get an oppurtunity to put in anything during runtime and sometimes it inserts random values by itself! for example, if i ran this in textmate: #include <iostream> int stonetolb(int); int main() { using namespace std; int stone; cout << "enter the weight in stone"; cin >> stone; int pounds = stonetolb(stone); cout << stone << "stone = "; cout << pounds <<" pounds."; return 0; } int stonetolb(int sts) { return 14 * sts; } I would come out with the output: enter the weight in stone32767stone = 458738 pounds. Why is this happening, and how do I stop it?

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  • Idea of an algorithm to detect a website's navigation structure?

    - by Uwe Keim
    Currently I am in the process of developing an importer of any existing, arbitrary (static) HTML website into the upcoming release of our CMS. While the downloading the files is solved successfully, I'm pulling my hair off when it comes to detect a site structure (pages and subpages) purely from the HTML files, without the user specifying additional hints. Basically I want to get a tree like: + Root page 1 + Child page 1 + Child page 2 + Child child page1 + Child page 3 + Root page 2 + Child page 4 + Root page 3 + ... I.e. I want to be able to detect the menu structure from the links inside the pages. This has not to be 100% accurate, but at least I want to achieve more than just a flat list. I thought of looking at multiple pages to see similar areas and identify these as menu areas and parse the links there, but after all I'm not that satisfied with this idea. My question: Can you imagine any algorithm when it comes to detecting such a structure? Update 1: What I'm looking for is not a web spider, but an algorithm do create a logical tree of the relationship of the pages to be able to create pages and subpages inside my CMS when importing them. Update 2: As of Robert's suggestion I'll solve this by starting at the root page, and then simply parse links as you go and treat every link inside a page simply as a child page. Probably I'll recurse not in a deep-first manner but rather in a breadth-first manner to get a more balanced navigation structure.

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