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• Didatic approaches to teach versioning with Git

  - by Herberth Amaral

  I have already taught versioning with Git, but I think it could be more enjoyable for the guys I teach if I use another approach to teach them. The guys I mentioned before were used to working with SVN and I tried to teach Git based on SVN. Not such a good idea. It seems that some guys/teams which use SVN need a re-education on version control when they're learning Git or another DCVCS. In another attempt, I tried to show a scenario where a development team try to work without a (D)VCS and then I showed how their lives could be easier if they used a (D)VCS. I had the impression that part of the audience left the presentation without a clue what I was talking about. I've taught other classes on other subjects without problems, so I think this is not a issue with me as a teacher, but with my method. I know Git and versioning as well I know the other subjects I've presented to the other classes. So, basically, how to teach Git/DCVCS? Start with some diffs/patches and manual versioning and then teach how it can be more productive with Git? Start with Git object model? Or try to start with some pretty commands and try to save some time? To be clear: I'm looking for approaches on how to teach DCVCS (focusing on Git) effectively, based on real experiences.

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• Resources for using TFS for Agile Project Development?

  - by Amy P

  Our company just installed TFS for us to start using for project development processes and source control. They want us to start using it to manage our projects as well. We have a small team, no current bug or task tracking software, and 2 developers of the 3 have experience with any actual methodologies. What books, websites, and/or other information can you recommend for us to use to get started?

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• Practicing Java Swing

  - by user1265125

  I've been learning Java by myself through many different online and offline resources. I just finished some basic practice and theoretical knowledge of Swing. Now, to become good at it I need some practice problems which would test my Swing skills, including GUI Building, listeners etc. But I can't figure out where to find such questions/problems for my practice. Do you guys know of an online resource? Some book would also do...

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• What sort of security method is this called (if it has a name)?

  - by loosebruce

  I have thought of a way of securing access to an application interacting with another application. Using this method Application 1 - "What is the sum of 1+1?" Application 2 - "3" Application 1 - "Access granted" Is this method used a lot, does it have a classification in the programming world? The advantages for me of using this is that I do not have to spend more effort implementing security keys/certificates. Any unauthorized machine trying to interpret it would give the correct result and identify itself as untrusted. What sort of weaknesses are there to doing this?

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• Restful WebAPI VS Regular Controllers

  - by Rohan Büchner

  I'm doing some R&D on what seems like a very confusing topic, I've also read quite a few of the other SO questions, but I feel my question might be unique enough to warrant me asking. We've never developed an app using pure WebAPI. We're trying to write a SPA style app, where the back end is fully decoupled from the front end code Assuming our service does not know anything about who is accessing/consuming it: WebAPI seems like the logical route to serve data, as opposed to using the standard MVC controllers, and serving our data via an action result and converting it to JSON. This to me at least seems like an MC design... which seems odd, and not what MVC was meant for. (look mom... no view) What would be considered normal convention in terms of performing action(y) calls? My sense is that my understanding of WebAPI is incorrect. The way I perceive WebAPI, is that its meant to be used in a CRUD sense, but what if I want to do something like: "InitialiseMonthEndPayment".... Would I need to create a WebAPI controller, called InitialiseMonthEndPaymentController, and then perform a POST... Seems a bit weird, as opposed to a MVC controller where i can just add a new action on the MonthEnd controller called InitialisePayment. Or does this require a mindset shift in terms of design? Any further links on this topic will be really useful, as my fear is we implement something that might be weird an could turn into a coding/maintenance concern later on?

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• Actor based concurrency and cancellation

  - by Akash

  I'm reading about actor based concurrency and I appreciate the simplicity of actors sequentially processing messages on a single thread. However there is one scenario that doesn't seen possible. Suppose that actor A sends a message to actor B, who then performs some long running task and returns a completion message to actor A. How can actor A force actor B to cancel the long running task after it has started? If actor B is running the task in its message queue thread, it won't pick up the cancellation message until it had completed the task; if actor B runs the task in a background thread then it seems to be violating the principle of actors. Is there a common way that this scenario is handled with actors? Or does each actor language/framework take a different approach? Or is this not a suitable problem to tackle via actors?

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• How to use TFS as a query tracking system?

  - by deostroll

  We already use tfs for managing defects in code etc, etc. We additionally need a way to "understand the domain & requirements of the products". Normally, without tfs we exchange emails with the consultants and have the questions/queries answered. If it is a feature implementation we sometimes "find" conflicts in the implementation itself. And when that happens the userstory is modified and the enhancement/bug as per that is raised in TFS. Sometimes it is critical we come back to decisions we made or questions we wanted answers to. Hence we need to be able to track how that "requirement idea" or that "query in concern" evolved. Hence how is it that we can use TFS to track all of this? Do we raise an "issue" item for this? Or do we raise a "bug" item? The main things we'd ideally look in a query tracking system are as follows: Area: Can be a module, submodule, domain. Sometimes this may be "General" - to address domain related stuff, or, event more granular to address modules, sub-modules. Take the case for the latter, if we were tracking this in excel sheets, we'd just write module1,submodule2; i.e. in a comma separated fashion. The things I would like here is to be able search for all queries relating to submodule2 sometime in the future. Responses: This is a record of conversations between the consultant and any other stakeholder. For a simple case, it would just be paragraphs. Each para would start with a name and date enclosed in brackets and the response following that...each para would be like a thread - much like a forum thread Action taken: We'd want to know how the query was closed, what was the input given, what were the changes that took place because of that, etc etc. These are fields I think I would need in such a system apart from some obvious ones like status, address to, resovled by, etc. I am open for any other fields which are sort of important. To summarise my question: how can we manage "queries" in the system? Where should we ideally store data pertaining to those three fields I have mentioned above (for e.g. is it wise to store responses in the history tag assuming we are opening a bug for the query)?

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• Help in (re)designing my Swing application

  - by Harihar Das

  I have developed a Swing application that controls execution of several script like jobs. I need to display the interim output of the jobs concurrently. I have followed MVC while writing the application. The application is working as expected. But off late I have the following requirements in hand: A few of the script jobs need special user privileges to execute so as to access specialized resources. There seems to be now way in Java to impersonate as a different user while running an application.[examined in this question]. Also trying to run the Swing application as a scheduled task in windows is not helping. Once started the jobs should be running even if the user logs off after starting the jobs. I am thinking of separating the execution logic from the UI and run that as a service; and introduce JMS in between the two layers so as to store/retrieve the interim the output. Note: I need to run this application on windows Any ideas on meeting my requirements will be highly appreciated.

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• Why is it so hard to find anything on MS site?

  - by Amir Rezaei

  I have always had this question in my mind and I would really be happy to get an explanation for this. Is it only me or do you also feel the same way that it's hard to find anything on MS site. For example, every time I need to download .NET framework I have to Google it. You never know what you can download, no category for downloads. You are simply left to a search field. You never know if you downloaded the latest version of the file. The tragically true is that you have to rely on their competitor Google to find anything on their site. I know that they are a big company. But is it really that hard to have an organized way to publish information?

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• Where to look for a programming partner?

  - by David

  Say that you want to start a new project (I'm talking about a serious project — e.g if you had an idea that seems good and profitable — not about something you start just to learn a new technology or just for your enjoyment) but you don't feel like you can do it alone since, for example, you lack the experience or the technical skills to go through all the phases needed to go from the idea to the final product. Say also that you don't simply want to hire someone. You want someone who can be as passionate as you in the job, that is “proficient” in and enthusiast of the same technologies as you are and that possibly has a background similar to yours (e.g. you both are students, you both come from a prestigious univerity or just you're both Star Trek nerds). So, basically you don't want a person to tell what to do (e.g. “implement this and that, slave!”) but someone who can be inspiring and bring something new and important to your project. Someone to go with you from the earliest stage — from clearly shaping the project's philosophy to drawing mockups etc. Someone who agrees to share the outcome of the project, that strongly believes in the idea behind it and is completely 50-50 with you. Now the question is: how to improve your chances of finding this person (or persons)? Where would you look at first? For example, if you had a lot of funds and were looking for someone to hire, you'd maybe post an ad in SO careers or jobs.73signals; if you already had a team and were looking for funding, you'd start a project on kickstarter or indiegogo, or you'd go to some startup event. But if you had to find a good partner (and programmer, of course) for you're project, where would you start looking? Which strategies would you use?

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• Mail Scanning System

  - by Mr D

  In the same way gmail can generate ads based on email content, I am looking for a way to develop a system which can: Allow users to connect their email address to our site It then would continously monitor all incomming emails From the incomming emails there would be a critera(e.g. a certain address or subject) if any of the emails matched the critea it would would be saved to a database Then once a new email had been found the users would receive an email notification will tells them to log back into the site to see it. My questions are: Would this be possible? What would be a good language to use(generally I like php, python and java) Are there any frameworks which would help do this? How would I connect the users email account to allow access to their emails(do I need a mail server?) Any advice? Thank you! If you need more information please let me know.

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• Monkey Hunter algorithm - Interview question [closed]

  - by Estefany Velez

  Question asked in an Interview: You are a hunter in the forest. A monkey is in the trees, but you don't know where and you can't see it. You can shoot at the trees, you have unlimited ammunition. Immediately after you shoot at a tree, if the monkey was in the tree, he falls and you win. If the monkey was not in the tree, he jumps (randomly) to an adjacent tree (he has to). Find an algorithm to get the monkey in the fewest shots possible. SOLUTION: The correct answer according to me was in the comments, credit to @rtperson: You could eliminate this possibility by shooting each tree twice as you sweep left, giving you a worst case of O(2n). EDIT: ...that is, a worst case of O(2n-1). You don't need to shoot the last tree twice.

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• What does the python Codecs module do?

  - by Aerovistae

  I just read through the documentation on the Codecs module, but I guess my knowledge/experience of comp sci doesn't run deep enough yet for me to comprehend it. It's for dealing with encoding/decoding, especially Unicode, and while to many of you that's a complete and perfect explanation, to me that's really vague. I don't really understand what it means at all. Text is text is text in a .txt file? Or so this amateur thought. Can anyone explain?

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• What tools are available to generate end user documentation?

  - by Rowland Shaw

  End user documentation on how to use applications is an important part of the user experience of applications, irrespective of whether they are winforms, wpf or even asp applications. In a startup or internal development team situation, where there isn't a dedicated documentation department, it can take a lot of resources to maintain screen shots and associated user documentation, such as on-line help or even printable manuals. What tools are available to assist in creating screenshots of all the "screens" within an application (be they winforms, wpf or aspx) to help automate the capture of screen shots, and associating with the relevant documentation? In addiiton, are there any that allow automation of annotations of a particular control (so use cases like: Draw a red box around the Username control with a callout to say "This is where you'd enter your user name, in the form '[email protected]'")?

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• How much will cost to hire a developer who have to make a SEO software? [closed]

  - by Victor

  Hey guys, I know NOTHING about software developing but I got an amazing idea about a software. The thing is I want to know how much money I would approximately need to hire someone to do it for me. The software is gonna have a lot of features, everything is relative to SEO - link building with Web 2.0 sites, Blog comments, Video Submittion, Bookmarking, RSS, Ping Mode, Forum register and submittion, Proxy mode, ect. The point is to be all automated! I mean all profile creation is going to be automate! There are a lot of softwares but nothing is doing everything that I want. So I would like to build my own software, use it for on my own and of course I'll sell it too! So how much do you think I would need to be able to order such a software?

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• Does it make sense to write a build scripts in C++?

  - by Klaim

  I'm using CMake to generate my projects IDE/makefiles, but I still need to call custom "scripts" to manipulate my compiled files or even generate code. In previous projects I've been using Python and it was OK, but now I'm having serious trouble managing a lot of dependencies in two very big projects I'm working on so I want to minimize the dependencies everywhere. Someone suggested to me to use C++ to write my build scripts instead of adding a language dependency just for that. The projects themeselves already use C++ so there are several advantages that I can see: to build the whole project, only a C++ compiler and CMake would be necessary, nothing else (all the other dependencies are C or C++); C++ type safety (when using modern C++) makes everything easier to get "correct"; it's also the language I know the better so I'm more at ease with it even if I'm able to write some good Python code; potential gain in execution speed (but i don't think it will really be perceptible); However, I think there might be some drawbacks and I'm not sure of the real impact as I didn't try yet: might be longer to write the code (that said I'm not sure because I'm efficient enough in C++ to write something that work quickly, so maybe for this system it wouldn't be so long to write) (compilation time shouldn't be a problem for this case); I must assume that all the text files I'll read as input are in UTF-8, I'm not sure it can be easilly checked at runtime in C++ and the language will not check it for you; libraries in C++ are harder to manage than in scripting languages; I lack experience and forsight so maybe I'm missing advantages and drawbacks. So the question is: does it make sense to use C++ for this? do you have experiences to report and do you see advantages and disadvantages that might be important?

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• Are there well-known examples of web products that were killed by slow service?

  - by Jeremy Wadhams

  It's a basic tenet of UX design that users prefer fast pages. http://www.useit.com/alertbox/response-times.html http://www.nytimes.com/2012/03/01/technology/impatient-web-users-flee-slow-loading-sites.html?pagewanted=all It's supposedly even baked into Google's ranking algorithm now: fast sites rank higher, all else being equal. But are there well known examples of web services where the popular narrative is "it was great, but it was so slow people took their money elsewhere"? I can pretty easily think of example problems with scale (Twitter's fail whale) or reliability (Netflix and Pinterest outages caused by a single datacenter in a storm). But can (lack of) speed really kill?

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• What can I do to make sure my code gets maintained in a developer light environment?

  - by asjohnson

  I am a contract data analyst, so I bounce between jobs every 3-6 months, which I find to be a good fit for me, but it leads to some problems when it comes to coding. I mostly do statistics (I've asked a similar question on cross validated, but the answers there are not relevant here), but I have also found out that the business world loves excel and loves copying and pasting the same thing over and over again even more. This led me to learn how to write VBA scripts and then VB.NET programs to automate as many of these reports as I can. I am certain my programs are not the most elegant, but I put a good bit of effort into making sure they work under as many cases as I can test, I add in exceptions and try to code so the program can handle changes in the files that it processes, but there is a limit, if you remove a huge portion of the data, there is a good chance my program is going to trip up, which I accept will inevitably happen. Usually a pretty minor change in the code fixes the problem and I do try and comment my code and make it readable under the assumption that some other person will have to read it some day. My problem is that I generally get put on teams of folks with essentially no experience with programming (like VBA would be a huge stretch for anyone I work directly with). I am wondering what I should be doing as the person that wrote the code to do my best to keep it maintained. I have two approaches in mind (outlined next), but would be very happy to get any advice. Solution 1: Find the more tech savvy coworkers and run them through the programs and what basic changes can be made. Honestly automating excel is about as easy as it can get when it comes to programming, so I feel like I could teach someone the basics of maintaining it pretty quick. Solution 2: Get in touch with the IT department and show them what is going on and maybe they will be able to help. The problem here is that the IT department is constantly swamped (as I'm sure many of you know) and I feel like kind of a jerk for dumping more things on them. I do leave my personal email address with places and am willing to answer quick questions via email, but I view the need for more exhaustive maintenance as something of an inevitability and would like to make sure I do my due diligence to make sure it gets done. I imagine some combination of the two approaches outlined there, but is there any kind of heads up I should give IT? I feel like I would be annoyed if I started getting requests to fix a program that I had never seen from some random guy that is no longer there.

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• Equation solver project

  - by Victor Barbu

  I would like to start a project destinated to students. My application has to solve any kind of equation, passed by the user as a string, exactly like in Matlab solve function. How shluld I do this? What programming language is the best for this purpose? Thanks in advance. P.S This is a screenshot made in Matlab. This is how I would like the user to insert and receive the answer: Another example:

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• PHP ORM style of querying

  - by Petah

  Ok so I have made an ORM library for PHP. It uses syntax like so: *(assume that $business_locations is an array)* Business::type(Business:TYPE_AUTOMOTIVE)-> size(Business::SIZE_SMALL)-> left_join(BusinessOwner::table(), BusinessOwner::business_id(), SQL::OP_EQUALS, Business::id())-> left_join(Owner::table(), SQL::OP_EQUALS, Owner::id(), BusinessOwner::owner_id())-> where(Business::location_id(), SQL::in($business_locations))-> group_by(Business::id())-> select(SQL::count(BusinessOwner::id()); Which can also be represented as: $query = new Business(); $query->set_type(Business:TYPE_AUTOMOTIVE); $query->set_size(Business::SIZE_SMALL); $query->left_join(BusinessOwner::table(), BusinessOwner::business_id(), SQL::OP_EQUALS, $query->id()); $query->left_join(Owner::table(), SQL::OP_EQUALS, Owner::id(), BusinessOwner::owner_id()); $query->where(Business::location_id(), SQL::in($business_locations)); $query->group_by(Business::id()); $query->select(SQL::count(BusinessOwner::id()); This would produce a query like: SELECT COUNT(`business_owners`.`id`) FROM `businesses` LEFT JOIN `business_owners` ON `business_owners`.`business_id` = `businesses`.`id` LEFT JOIN `owners` ON `owners`.`id` = `business_owners`.`owner_id` WHERE `businesses`.`type` = 'automotive' AND `businesses`.`size` = 'small' AND `businesses`.`location_id` IN ( 1, 2, 3, 4 ) GROUP BY `businesses`.`id` Please keep in mind that the syntax might not be prefectly correct (I only wrote this off the top of my head) Any way, what do you think of this style of querying? Is the first method or second better/clearer/cleaner/etc? What would you do to improve it?

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• When do domain concepts become application constructs?

  - by Noren

  I recently posted a question regarding recovering a DDD architecture that became an anemic domain model into a multitier architecture and this question is a follow-on of sorts. My question is when do domain concepts become application constructs. My application is a local client C# 4/WPF with the following architecture: Presentation Layer Views ViewModels Business Layer ??? Domain Layer Classes that take the POCOs with primitive types and create domain concepts (e.g. image, layer, etc) Sanity checks values (e.g. image width 0) Interfaces for DTOs Interface for a repository that abstracts the filesystem Data Access Layer Classes that parse the proprietary binary files into POCOs with primitive types by explicit knowledge of the file format Implementation of domain DTOs Implementation of domain repository class Local Filesystem Proprietary binary files When does the MyImageType domain class with Int32 width, height, and Int32[] pixels become a System.Windows.Media.ImageDrawing? If I put it in the domain layer, it seems like implemenation details are being leaked (what if I didn't want to use WPF?). If I put it in the presentation layer, it seems like it's doing too much. If I create a business layer, it seems like it would be doing too little since there are few "rules" given the CRUD nature of the application. I think all of my reading has lead to analysis paralysis, so I thought fresh eyes might lend some perspective.

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• GPL - what is distribution?

  - by Martin Beckett

  An interesting point came up on another thread about alleged misappropriation of a GPL project. In this case the enterprise software was used by some large companies who essentially took the code, changed the name, removed the GPL notices and used the result. The point was - if the company did this and only used the software internally then there isn't any distribution and that's perfectly legal under GPL. Modifications by their own employees for internal use would also be allowed. So At what point does it become a distribution? Presumably if they brought in outside contractors under 'work for hire' their modifications would also be internal and so not a distribution. If they hired an external software outfit to do modifications and those changes were only used internally by the company - would those changes be distributed? Does the GPL apply to the client or to the external developers? If the company then give the result to another department, another business unit, another company? What if the other company is a wholly owned subsidiary? ps. yes I know the answer is ask a lawyer. But all the discussion I have seen over GPL2/GPL3 distribution has been about webservices - not about internal use.

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• When to use Constants vs. Config Files to maintain Configuration

  - by CoffeeAddict

  I often fight with myself on whether to put certain keys in my web.config or in a Constants.cs class or something like this. For example if I wanted to store application specific keys for whatever the case may be..I could store it and grab it from my web config via custom keys or consume it by referencing a constant in my constants class. When would you want to use Constants over config keys? This question really applies to any language I think.

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• Is Play Framework good for doing some logic parallely?

  - by pmichna

  I'm going to build a web application that's going to host urban games. A user visits my website, clicks "Start game" and starts receiving some SMS messages when gets to some location and has to answer them to get points. My question: is Play suitable for this kind of application? From what I've read I know for sure it's ok for traditional web applications: user interface for same data storage and manipulation. But what if after clicking the "start button" some logic has to go on its own course? How would I handle parallely checking geolocation of the players (I have API for that)? I guess in some threads that would ping them every ~5 sec. and do some processing but is it possible to just "disconnect" them from the main user interface? So to sum up: I want an application written in Play that starts a separate thread for a game after clicking "start game" and other users are able to view their data (statisctics etc.), while the threads work their way with the game logic. I found something like jobs but they are documented for version 1.2 (current one is 2.2). Sorry for my somewhat fuzzy explenation, I tried to do my best.

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• Github Workflow: Pushing small fix branches to remote, or keep them local?

  - by Isaac Hodes

  In Scott Chacon's workflow (explained eg in this SO answer), with essentially two silos (development, and master), if, say I have a small bug to fix (e.g. can be fixed with a few characters) is the optimal way of doing that: a) branch off of development a branch called e.g. fix_123. Push this branch to origin as I work on it. When it's done, code-reviewed, whatever, merge into development and push development to origin. b) Same as above, but without pushing fix_123 to origin.

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