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• Examples of continuous integration workflow using git

  - by Andrew Barinov

  Can anyone provide a rough outline of their git workflow that complies with continuous integration. E.g. How do you branch? Do you fast forward commits to the master branch? I am primarily working with Rails as well as client and server side Javascript. If anyone can recommend a solid CI technology that's compatible with those, that'd be great. I've looked into Jenkins but would like to check out other good alternatives. To put some context into this, I am planning on transitioning from working as a single developer into working as part of the team. I'd like to start standardizing my own personal workflow so that I can onboard new devs quickly.

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• Which operating systems book is good as a quick refresher?

  - by rdasxy

  I am preparing for a technical interview and need to review the basics of major operating systems concepts. We used Tanenbaum's Modern Operating Systems in school for our operating systems course, which is a good book, but too long to be reviewed in the course of a few days. For an example, I am looking for what Programming Interviews Exposed is to Weiss's Data Structures & Algorithm Analysis. Any suggestions?

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• choosing Database and Its Design for Rails

  - by Gaurav Shah

  I am having a difficulty in deciding the database & its structure. Let us say the problem is like this. For my product I have various customers( each is an educational institute) Each customer have their own sub-clients ( Institution have students) Each student record will have some basic information like "name" & "Number" . There are also additional information that a customer(institution) might want to ask sub-client(student) like "email" or "semester" I have come up with two solutions : 1. Mysql _insititution__ id-|- Description| __Student__ id-|-instituition_id-|-Name-|-Number| __student_additional_details__ student_id -|- field_name -|- Value Student_additional_details will have multiple records for each student depending upon number of questions asked from institution. 2.MongoDb _insititution___ id-|- Description| _Student__ id-|-instituition_id-|-Name-|-Number|-otherfield1 -|- otherfield2 with mongo the structure itself can be dynamic so student table seems really good in mongo . But the problem comes when I have to relate student with institution . So which one is a better design ? Or some other idea ?

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• Abstracting away the type of a property

  - by L. De Leo

  In Python luckily most of the times you don't have to write getters and setters to get access to class properties. That said sometimes you'll have to remember that a certain property is a list or whatnot and a property would save you there by abstracting the type and providing a setter to add something to such list for example rather than exposing the list directly. Where do you draw the line between exposing the type directly or wrapping its access in a property? What's the general "pythonic" advice?

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• Do I need to match hardware on a Mac to my PC to get the same user experience?

  - by Darth

  I've been playing around with the thought of moving from a PC to a Mac. if you don't want to read this, skip to the "upgrade options" My current setup Most of my time I spent moving back and forth between Linux and Windows. During the last upgrade to Vista, I got myself pc with Core 2 Quad, 8GB of RAM and GeForce 9800GTX+. Currently I'm running dual boot between Ubuntu 10.04 and Windows Vista x64. Most of my work, around 80%, I can do on Ubuntu, which is mostly Ruby/Java programming. If that was all I needed, Ubuntu would be really great. However, I also do quite a lot of Photography and Design, which forces me to use Adobe software (not only Photoshop). I also work with Wacom Intuos4 tablet, which doesn't really have great support on Linux machines. I've tried virtualization both ways (Linux in Win and Win in Linux), but neither was anywhere near satisfying. These are those of many many reasons I want to move to OS X. Upgrade options This is how I see my upgrade options: Mac Mini - cheapest solution, but worst performance iMac - more expensive, better performing with second LCD for free Mac Pro - could match my current PC performance, currently outside of the price range When I compare the Mac hardware vs my current PC, it will be always worse, unless I decide to pump in a lot of money. The question that comes to my head, do I need to match my current PC hardware to get the same user experience with a Mac? If I look at it from the Vista point of view, 2GB RAM is as low as it gets, 4GB is usable ... and the 8GB runs very smoothly. PC HW != Mac HW? If I bought the Mac Mini for roughly the same price I paid for my PC (Core 2 Quad with 8GB RAM), I'd get Core 2 Duo with 4GB RAM. But I don't want to run Vista on it, so I can't compare the hardware directly. Say that I want to do the same things on the Mac Mini as I do on my PC, eg. open up 50 tabs in Google Chrome and start working with a large PSD in Photoshop (couple hundred MB), would running on Mac OS X compensate for the lower hardware performance? My point is, that if I'm about to upgrade, I wouldn't like to upgrade to hardware that runs a lot slower. Good analogy for this is Vista vs Ubuntu, where you can run Ubuntu smoothly on a low end laptop, but in Vista, you'd be happy to open a browser. Does the same principle apply to OS X?

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• Creating an email notification system based on polling database rows

  - by Ashish Sharma

  I have to design an email notification system based on the following requirements: The email notifications would be created based on polling rows in a Mysql 5.5 DB table when they are in a particular 'Completed' state. The email notification should be sent out in no more than 5 minutes from the time the row was created in the DB table (At the time of DB table row creation the state of the row might not be 'Completed'). Once 5 minutes for the DB table row expire in reaching the 'Completed' state, separate email notification need to be sent (basically telling the user that the original email notification would be delayed) and then sending the email notification as and when the row state reaches to being 'Completed'. The rest of the system requirements are : Adding relevant checks to monitor the whole system via MBeans interface. The system should be scalable so that if the rate of DB table rows creation increases so does the Email notification system be able to ramp up. So I request suggestions on following lines: What approach should I take in solving the problem described from a programming/Design pattern point of view? Suggestion for any third party plugin/software that can be used to solve the problem described? Points to take care regarding scalability and monitoring the health of the system? Java is the language of preference but I am open to using off the shelf components that can be interfaced with Java language or provide standard ports for communication. Currently I do have an in house grown system (written in Java) that is catering to the specified requirements, but it's now crumbling under increased load and now I want to give the problem a fresh look. thanks in advance Ashish

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• How do you put price on your source code?

  - by deviDave

  I was asked to sell the source code of small utility app I did years ago with existing users of this app. I tried investigating how to put price on the source code and haven't come up with a good solution so far. I first tried searching the net, but information I found there are somehow far from reality. Then I found a few people how also sold their source code with users as well. But their price seems unrealistic (too high). For example, one person had an app which price was around $200 for 1 user and he had 80 users. He sold the source with users for $30k. How did he come up with this price? Is it a good price if I charge the code by formula: num_of_users x app_price + app_price x num_of_new_users_in_one_year ? This means that I count the price by selling each user for the price of the app then adding the amount of money I earn in 1 year from this app. If this is a good formula, what shall I do with sources who do not have users yet?

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• How to cross-reference many character encodings with ASCII OR UTFx?

  - by Garet Claborn

  I'm working with a binary structure, the goal of which is to index the significance of specific bits for any character encoding so that we may trigger events while doing specific checks against the profile. Each character encoding scheme has an associated system record. This record's leading value will be a C++ unsigned long long binary value and signifies the length, in bits, of encoded characters. Following the length are three values, each is a bit field of that length. offset_mask - defines the occurrence of non-printable characters within the min,max of print_mask range_mask - defines the occurrence of the most popular 50% of printable characters print_mask - defines the occurrence value of printable characters The structure of profiles has changed from the op of this question. Most likely I will try to factorize or compress these values in the long-term instead of starting out with ranges after reading more. I have to write some of the core functionality for these main reasons. It has to fit into a particular event architecture we are using, Better understanding of character encoding. I'm about to need it. Integrating into non-linear design is excluding many libraries without special hooks. I'm unsure if there is a standard, cross-encoding mechanism for communicating such data already. I'm just starting to look into how chardet might do profiling as suggested by @amon. The Unicode BOM would be easily enough (for my current project) if all encodings were Unicode. Of course ideally, one would like to support all encodings, but I'm not asking about implementation - only the general case. How can these profiles be efficiently populated, to produce a set of bitmasks which we can use to match strings with common characters in multiple languages? If you have any editing suggestions please feel free, I am a lightweight when it comes to localization, which is why I'm trying to reach out to the more experienced. Any caveats you may be able to help with will be appreciated.

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• Remapping keyboard to get extra cursor keys - but why stick to VIM standard hjkl

  - by Carlo V. Dango

  Inspired from VIM I recently remapped my keyboard layout to get extra keys for cursor movement. Being fluent in both QWERTY and DVORAK, it came quite natural to me to remap the DF and JK keys rather than the VIM standard hjkl keys. Here is my reasoning It enables me to quickly identify cursor keys since F and J are physically marked on my keyboard I'm using two hands for movement rather than one. I guess from DVORAK I learned to appreciate shifting between hands rather than using primarily one hand. It maps well with the Kinesis keyboard mapping http://www.kinesis-ergo.com/advantage.htm that I use occasionally. I feel I'm using my strongest fingers. I don't have to stretch my right index finger to read H as I would using the VIM layout. However, since I am still doing green field explorations on the cursor key remapping, I'd like others to share their experiences and/or criticize my suggested mapping. PS. If you want to toy around with my remapping using Autohotkey here is my script ; extra cursor keys. !d:: Send {Left} <^>!d:: Send {Left} !f:: Send {Right} <^>!f:: Send {Right} !j:: Send {Up} <^>!j:: Send {Up} !k:: Send {Down} <^>!k:: Send {Down} The question Is this mapping sane or is the VIM mapping superior?

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• Reading and conditionally updating N rows, where N > 100,000 for DNA Sequence processing

  - by makerofthings7

  I have a proof of concept application that uses Azure tables to associate DNA sequences to "something". Table 1 is the master table. It uniquely lists every DNA sequence. The PK is a load balanced hash of the RK. The RK is the unique encoded value of the DNA sequence. Additional tables are created per subject. Each subject has a list of N DNA sequences that have one reference in the Master table, where N is 100,000. It is possible for many tables to reference the same DNA sequence, but in this case only one entry will be present in the Master table. My Azure dilemma: I need to lock the reference in the Master table as I work with the data. I need to handle timeouts, and prevent other threads from overwriting my data as one C# thread is working with the information. Other threads need to realise that this is locked, and move onto other unlocked records and do the work. Ideally I'd like to get some progress report of how my computation is going, and have the option to cancel the process (and unwind the locks). Question What is the best approach for this? I'm looking at these code snippets for inspiration: http://blogs.msdn.com/b/jimoneil/archive/2010/10/05/azure-home-part-7-asynchronous-table-storage-pagination.aspx http://stackoverflow.com/q/4535740/328397

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• How do you guys handle translation for software localization?

  - by JohnFx

  Most of the software I have written over my career has been built for English speaking customers, but recently I've been working on a project where localization of the UI for a wider range of languages is desired. I am just curious how other programming shops obtain the translations. Do they use the notoriously flawed online translation engines? I know there are for-hire translators out there, but am I going to have to track down and contract like a dozen of them to do a thorough job of localizing my interface? Are there services that specialize in doing this for a wide range of languages? Perhaps using something like Amazon's Mechanical Turk would be an option, but I have no idea how diverse the available workforce is on that site. I'd imagine not very.

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• Guidance for a C# developer to become better UI developer

  - by Pankaj Upadhyay

  I am a C# developer and had developed simple websites in regular asp.net(with asp.net controls) and a wpf application. Nowadays, I am trying myself in Asp.net MVC3 and been exposed to the HTML with Razor view Engine. To be honest, I am not too good or I should awful at my knowledge of HTML and CSS. Therefore, I keep posting questions now and then on SO for very simple tasks. This has made me very tired of the this Q&A development process. So, now i am thinking of learning the basics of HTML, CSS and maybe some Javascript. Therefore i would request you to guide me to become an efficient enough developer for these technologies. Something that won't take much time and get me up and running fast.

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• Are VB.NET to C# converters actually compilers?

  - by Rowan Freeman

  Whenever I see programs or scripts that convert between high-level programming languages they are always labelled as converters. "VB.NET to C# converter" on Google results in expected, useful hits. However "VB.NET to C# compiler" on Google results in things like comparisons between the C# and VB.NET compilers and other hits that are not quite what you'd be looking for. Webopedia defines Compiler as A program that translates source code into object code Eric Lipper in an answer to: "How do I create my own programming language and a compiler for it" suggests: One of the best ways to get started writing a compiler is by writing a high-level-language-to-high-level-language compiler. Is a converter really just a compiler? What separates the two?

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• Any experience with Mono on production servers?

  - by Jonas

  I am curios to use .NET for some web applications (e.g. ASP.NET MVC 2). However my budget is limited so I would like to use Mono on Linux. I have never used Mono before, and I haven't read about any bigger sites that is using Mono+Linux on the server in production. What's your experience using Mono on Linux in production? How is the performance and stability compared to .NET on Windows Server? Is there any popular sites that is using it in production? Any articles available online were they share their experiences?

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• Ruby freelancing: realistic expectations?

  - by Sophie

  Hi guys, I'm in a situation where I only need $100 to live at a place. How is this relevant to programming? Well, I would like to hear the opinions of those on this site if it is at all realistic to expect a Ruby noobie to be able to make $100 freelancing by a month from now, assuming a great deal of effort and enthusiasm o_O I'm a complete noob to programming ;d, learning Ruby before Rails. (I also asked this on StackOverflow, but want lots of answers so .<)

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• Software consultancy or in-house development?

  - by JefClaes

  What are the benefits and drawbacks of working as an in-house developer versus working as a consultant and vice versa? I am pretty sure both breeds can be found on these forums and I hope you are willing to share your experience. Edit: Let me clarify the question. I wonder what the experience is like being a developer. For example: being an in-house developer, you are able to learn from your mistakes. Being a consultant is often more challenging, because there is more variety in the problems you have to solve. PS: Although I realise that this is a subjective question, I don't necessarily see it as one of those bad-subjective questions.

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• KnownType Not sufficient for Inclusion

  - by Kate at LittleCollie

  Why isn't the use of KnownType attribute in C# sufficient for inclusion of a DLL? Working with Visual Studio 2012 with TFS responsible for builds, I am on a project in which a service required use of this attribute as in the following: using Project.That.Contains.RequiredClassName; [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall, Namespace="SomeNamespace")] [KnownType(typeof(RequiredClassName))] public class Service : IService { } But to get the required DLL to be included in the bin output and therefore the installer from our production build, I had to add the follow to the constructor for Service: public Service() { // Exists only to force inclusion var ignore = new RequiredClassName(); } So, given that the project that contains RequiredClassName is itself referenced by the project that contains Service, why isn't the use of the KnownType attribute sufficient for inclusion of DLL in the output?

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• Java Transaction Service without the application server

  - by johnny

  Is it possible to have a Java standalone application (no application server attached) that exposes some operations that a client can call and be the one to manage the transactions? I was thinking this application to expose JNDI resources and get a hold of a java:comp/UserTransaction from there, get also a bean from there and call methods A, B and C on it and coordinate the transaction from the client? The application I'm writing isn't complex enough so that I need a big application server around it so I'm thinking to have a standalone JTS inside it that the client could interact with from a transactions point of view. I don't have much experience with distributed transactions and don't really know how to tackle the issue. Is it even possible? Am I getting myself into something beyond what a mere mortal (programmer) can handle? How can I approach this?

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• What's The Difference Between Imperative, Procedural and Structured Programming?

  - by daniels

  By researching around (books, Wikipedia, similar questions on SE, etc) I came to understand that Imperative programming is one of the major programming paradigms, where you describe a series of commands (or statements) for the computer to execute (so you pretty much order it to take specific actions, hence the name "imperative"). So far so good. Procedural programming, on the other hand, is a specific type (or subset) of Imperative programming, where you use procedures (i.e., functions) to describe the commands the computer should perform. First question: Is there an Imperative programming language which is not procedural? In other words, can you have Imperative programming without procedures? Update: This first question seems to be answered. A language CAN be imperative without being procedural or structured. An example is pure Assembly language. Then you also have Structured programming, which seems to be another type (or subset) of Imperative programming, which emerged to remove the reliance on the GOTO statement. Second question: What is the difference between procedural and structured programming? Can you have one without the other, and vice-versa? Can we say procedural programming is a subset of structured programming, as in the image?

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• Transitioning from Oracle based CMS to MySQL based CMS

  - by KM01

  We're looking at a replacement for our CMS which runs on Oracle. The new CMSes that we've looked at can in theory run on Oracle, but most of the vendor's installs run off of MySQL vendor supports install of their CMS on MySQL, and a "theoretical" install on Oracle the vendor's dev shops use MySQL none of them develop/test against Oracle Our DBA team works exclusively with Oracle, and doesn't have the bandwidth to provide additional support for a highly available and performing MySQL setup. They could in theory go to training and get ramped up, but our time line is also short (surprise!). So ... I guess my question(s) are: If you've seen a situation like this, how have you dealt with it? What tipped the balance either way? What type of effort did it take? If you're to do it over, what would you do differently ... ? Thanks! KM

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• Got an idea for an application, but part of it is patented, any suggestions?

  - by tekiegreg

  Hi there, so I've been working on developing an idea for an application that I think has the potential to be successful, however after some initial research I've discovered that at least part of my ideas are covered by a patent out there, the patent in particular is held by a really large company (I don't want to give away specifics for fear I'd draw their attention for sure). I'm debating a few options: 1) Develop patents around my ideas that don't conflict and maybe approach the company in question for a license exchange 2) Just approach them for a license outright 3) Just develop around it anyways and hope for the best :-p What have other people done in these situations? Are companies generally willing to grant patent licenses? Are they willing to grant them at reasonable prices? Thoughts?

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• Git: Fixing a bug affecting two branches

  - by Aram Kocharyan

  I'm basing my Git repo on http://nvie.com/posts/a-successful-git-branching-model/ and was wondering what happens if you have this situation: Say I'm developing on two feature branches A and B, and B requires code from A. The X node introduces an error in feature A which affects branch B, but this is not detected at node Y where feature A and B were merged and testing was conducted before branching out again and working on the next iteration. As a result, the bug is found at node Z by the people working on feature B. At this stage it's decided that a bugfix is needed. This fix should be applied to both features, since the people working on feature A also need the bug fixed, since its part of their feature. Should a bugfix branch be created from the latest feature A node (the one branching from node Y) and then merged with feature A? After which both features are merged into develop again and tested before branching out? The problem with this is that it requires both branches to merge to fix the issue. Since feature B doesn't touch code in feature A, is there a way to change the history at node Y by implementing the fix and still allowing the feature B branch to remain unmerged yet have the fixed code from feature A? Mildly related: Git bug branching convention

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• How do one improve him/her problem-solving ability ?

  - by gcc

  How can one improve him/her problem-solving ability? Every one says same thing "a real programmer knows how to handle real problem", but they forget how they learn this ability, or where (I know in school, no one gives us any ability, of course in my opinion). If you have any idea except above ones, feel free when you give your advice solve more problems do more exercises, write code, search google then write more ... For me, my question is like "Use complex/known library instead of using your own." In other words,t I want your presonal experience, book recommendation, web page on problem solving. Moreover, look your problem-solving method and give us your personal ability as if it is an algorithm

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• When to favor webforms over MVC

  - by P.Brian.Mackey

  I know Microsoft has said "MVC is not a replacement for webforms". Some developers say webforms is faster to develop than MVC, but I believe this all comes down to comfort level with the technology; so I don't want any answers in this direction. Given that MVC gives a developer more control over our application, why is webforms not considered obsolete? When should I favor webforms over MVC for new development?

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• Static objects and concurrency in a web application

  - by Ionut

  I'm developing small Java Web Applications on Tomcat server and I'm using MySQL as my database. Up until now I was using a connection singleton for accessing the database but I found out that this will ensure just on connection per Application and there will be problems if multiple users want to access the database in the same time. (They all have to make us of that single Connection object). I created a Connection Pool and I hope that this is the correct way of doing things. Furthermore it seems that I developed the bad habit of creating a lot of static object and static methods (mainly because I was under the wrong impression that every static object will be duplicated for every client which accesses my application). Because of this all the Service Classes ( classes used to handle database data) are static and distributed through a ServiceFactory: public class ServiceFactory { private static final String JDBC = "JDBC"; private static String impl; private static AccountService accountService; private static BoardService boardService; public static AccountService getAccountService(){ initConfig(); if (accountService == null){ if (impl.equalsIgnoreCase(JDBC)){ accountService = new JDBCAccountService(); } } return accountService; } public static BoardService getBoardService(){ initConfig(); if (boardService == null){ if (impl.equalsIgnoreCase(JDBC)){ boardService = new JDBCBoardService(); } } return boardService; } private static void initConfig(){ if (StringUtil.isEmpty(impl)){ impl = ConfigUtil.getProperty("service.implementation"); // If the config failed initialize with standard if (StringUtil.isEmpty(impl)){ impl = JDBC; } } } This was the factory class which, as you can see, allows just one Service to exist at any time. Now, is this a bad practice? What happens if let's say 1k users access AccountService simultaneously? I know that all this questions and bad practices come from a bad understanding of the static attribute in a web application and the way the server handles this attributes. Any help on this topic would be more than welcomed. Thank you for your time!

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