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  • What is the correct way to handle debug output in Java?

    - by Federico Zancan
    As my current Java projects grow bigger and bigger, I feel a likewise growing need to insert debug output in several points of my code. To enable or disable this feature appropriately, depending on the opening or closure of the test sessions, I usually put a private static final boolean DEBUG = false at the beginning of the classes my tests are inspecting, and trivially use it this way (for example): public MyClass { private static final boolean DEBUG = false; ... some code ... public void myMethod(String s) { if (DEBUG) { System.out.println(s); } } } and the like. But that doesn't bliss me out, because of course it works but there could be too many classes in which to set DEBUG to true, if you are not staring at just a couple of them. Conversely, I (like - I think - many others) wouldn't love to put the whole application in debug mode, as the amount of text being output could be overwhelming. So, is there a correct way to architecturally handle such situation or the most correct way is to use the DEBUG class member?

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  • Where to put code documentation?

    - by Patrick
    I am currently using two systems to write code documentation (am using C++): Documentation about methods and class members are added next to the code, using the Doxygen format. On a server Doxygen is run on the sources so the output can be seen in a web browser Overview pages (describing a set of classes, the structure of the application, example code, ...) is added to a Wiki I personally think that this approach is easy because the documentation about members and classes is really close to the code, while the overview pages are really easy to edit in the Wiki (and it's also easy to add images, tables, ...). A web browser allows you to see both documentations. My co-worker now suggests to put everything in Doxygen, because we can then create one big help file with everything in it (using either Microsoft's HTML WorkShop or Qt Assistant). My concern is that editing Doxygen-style documentation is much harder (compared to Wiki), especially when you want to add tables, images, ... (or is there a 'preview' tool for Doxygen that doesn't require you to generate the code before you can see the result?) What do big open-source (or closed source) projects use to write their code documentation? Do they also split this up between Doxygen-style and a Wiki? Or do they use another system? What is the most appropriate way to expose the documentation? Via a Web server/browser, or via a big (several 100MB) help file? Which approach do you take when writing code documentation?

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  • Tomorrow's web development: What's the bearing?

    - by pex
    I just read a wonderful article about headaches web developers have to live with nowadays. Several questions from that article busied me for some time as well. Now I am wondering whether I missed something, whether there are approaches other than Sproutcore or Cappucino to combine the eternal detached worlds of backend and frontend. How to only write validations once? How to collect business logic in only one model? Are we heading toward a combination of CouchDB Views, NodeJS and minimalistic client-side scripts including plenty of XHR requests? Or shall we follow the direction of handling everything except the database on client side? Is everything about JavaScript? I simply ask for approaches of setting up the next web application, for best practices and promising new technologies and frameworks.

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  • Do employers prefer software engineering over CS majors?

    - by Joey Green
    I'm in grad school at a university that was one of the first to have a software engineering accredited program. My undergrad is in CS. An employer recently recruited at our university and hired 5 SE majors. None of them were CS. Do employers prefer software engineering majors? The reason I ask is because I can focus on many different areas during my graduate studies and really want to take the classes that will help me land a great job. Right now I'm either going to use CUDA and parallelize an advanced ray-tracer for a graduate project or do research on non-photo-realistic rendering in augmented reality. Pursuing these would leave very little SE classes in my schedule. If I went the software engineering route, I would probably either do research into data-oriented programming or software design complexity. Sometimes I think when I'm 40 and look back will it matter at all? For some reason I'm thinking not.

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  • How do functional languages handle random numbers?

    - by Electric Coffee
    What I mean about that is that in nearly every tutorial I've read about functional languages, is that one of the great things about functions, is that if you call a function with the same parameters twice, you'll always end up with the same result. How on earth do you then make a function that takes a seed as a parameter, and then returns a random number based on that seed? I mean this would seem to go against one of the things that are so good about functions, right? Or am I completely missing something here?

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  • What should be a fair amount of time in an interview before rejecting a candidate?

    - by Danish
    As a panelist for technical interviews, you often come across candidates who have all the requried educational qualifications, skill sets and experience level on resumes, but struggle to answer even the most basic questions. Ideally, technical interviews should try to check different aspects of a candidate and test them on various skills. So, if the candidate falters on one aspect, one should test the other ones before coming to a conclusion. But often, if a candidates falters on the first few questions, the red flag rises up pretty quickly. What in your opinion should be the bare minimum time spent with a candidate before making a fair accessment of his/her skills and suitability for the job?

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  • Best exception handling practices or recommendations?

    - by user828584
    I think the two main problems with my programs are my code structure/organization and my error handling. I'm reading Code Complete 2, but I need something to read for working with potential problems. For example, on a website, if something can only happen if the user tampers with data via javascript, do you write for that? Also, when do you not catch errors? When you write a class that expects a string and an int as input, and they aren't a string and int, do you check for that, or do you let it bubble up to the calling method that passed incorrect parameters? I know this is a broad topic that can't be answered in a single answer here, so what I'm looking for is a book or resource that's commonly accepted as teaching proper exception handling practice.

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  • How do I convince my team that a requirements specification is unnecessary if we adopt user-stories?

    - by Nupul
    We are planning to adopt user-stories to capture stakeholder 'intent' in a lightweight fashion rather than a heavy SRS (software requirements specifications). However, it seems that though they understand the value of stories, there is still a desire to 'convert' the stories into an SRS-like language with all the attributes, priorities, input, outputs, source, destination etc. User-stories 'eliminate' the need for a formal SRS like artifact to begin with so what's the point in having an SRS? How should I convince my team (who are all very qualified CS folks by the way - both by education and practice) that the SRS would be 'eliminated' if we adopted user-stories for capturing the functional requirements of the system? (NFRs etc can be captured too, but that's not the intent of the question). So here's my 'work-flow' argument: Capture initial requirements as user-stories and later elaborate them to use-cases (which are required to be documented at a low level i.e. describing interactions with the UI prototypes/mockups and are a deliverable post deployment). Thus going from user-stories to use-cases rather than user-stories to SRS to use-cases. How are you all currently capturing user-stories at your workplace (if at all) and how do you suggest I 'make a case' for absence of SRS in presence of user-stories?

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  • How do you develop web applications? [closed]

    - by ck3g
    How do you and/or your team develop your web applications? Language, framework or platform doesn't matter. I would like to know about the structure of your environment. For example: Using IDE on workstation and project files on remote host accessing via sftp. Files are saved instantly on remote host; All files are local and are uploaded on remote host during saving; Files are local, web server is running on local computer and is tested at local host. etc. You could write down also about the benefits of your approach, this will be useful for me. Thanks upd: Here must be a question and here it is: which is the best approach by your opinion?

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  • Building massively scalable systems, where to start? [closed]

    - by Mahmoud Hossam
    Recently, I've been seeing these job postings about building scalable systems using Java, and some of the technologies mentioned were: Cassandra Thrift Hadoop MapReduce Among others. How can I get started with these technologies? Is there something else I need to know before actually learning any of these technologies? Maybe some general concepts about building highly available and scalable systems? I already know Java SE, so I won't be starting from scratch.

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  • Buy vs. Build - FTP Service

    - by Joel Martinez
    We have a need to FTP files that are generated by our system, so we're trying to decide whether we should spend the time to build something that meets our criteria (relatively easy, .NET has FTP functionality built in, among other more advanced libs from 3rd parties). Or if we should buy something off the shelf. Our requirements are roughly: Must be able to trigger a file send programmatically Needs to retry N number of times (configurable) Queryable status of FTP requests Callback on completion or fail of an FTP request I don't need to be sold on the relative simplicity of building something like that for myself. However I do want to do the due diligence of seeing what products are available ... because if something does exist that matches the requirements above, I wouldn't mind paying for it :-) Any thoughts or links would be greatly appreciated. Thanks!

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  • How do bug reports factor in to a sprint?

    - by Mark Ingram
    I've been reading up on Scrum recently. From my understanding, a meeting is held before the sprint starts, to decide what gets moved from the product backlog to the upcoming sprint backlog. Once a feature is completed in the current sprint, it will go into the "Ready to QA" bucket, and it's at this point that I'm getting confused. Do bug reports go back into the product backlog? I assume they can't go back into the sprint backlog as we've already decided what work will be done for this cycle? What happens when QA finds a bug? Where does it go?

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  • How can I unit test a class which requires a web service call?

    - by Chris Cooper
    I'm trying to test a class which calls some Hadoop web services. The code is pretty much of the form: method() { ...use Jersey client to create WebResource... ...make request... ...do something with response... } e.g. there is a create directory method, a create folder method etc. Given that the code is dealing with an external web service that I don't have control over, how can I unit test this? I could try and mock the web service client/responses but that breaks the guideline I've seen a lot recently: "Don't mock objects you don't own". I could set up a dummy web service implementation - would that still constitute a "unit test" or would it then be an integration test? Is it just not possible to unit test at this low a level - how would a TDD practitioner go about this?

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  • What is the best way to store anciliary data with a 2D timeseries object in R?

    - by Mike52
    I currently try to move from matlab to R. I have 2D measurements, consisting of irradiance in time and wavelength together with quality flags and uncertainty and error estimates. In Matlab I extended the timeseries object to store both the wavelength array and the auxiliary data. What is the best way in R to store this data? Ideally I would like this data to be stored together such that e.g. window(...) keeps all data synchronized.

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  • Backbone.js, Rails and code duplication

    - by Matteo Pagliazzi
    I'm building a web app and I need a JS framework like Backbone.js to work with my backend rovided by Rails that mostly return JSON objects after DB queries. Searching on the web I've discovered Backbone which seems to be complete, quite populare and actively developed but I've noticed that a lot of things done by Backbone are simply a duplicte of the works done by Rails: for example validation and models. My idea of "perfect" (for my actual needs) JS mvc (it can't be called mvc but i don't have any other names) is something really simple that has a function for each action in my Rails controller that are triggered by a specific event (user/hash changes, click on a button...) and send requests to the server that respond with a JSON object then I'll load a template or execute some JS code. Do you have any concern/suggestion about my idea? Do you know some "micro" js framework like what i have described? If you have worked with backone.js + rails what can you suggest me?

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  • Colleague unwilling to use unit tests "as it's more to code"

    - by m.edmondson
    A colleague is unwilling to use unit tests and instead opting for a quick test, pass it to the users, and if all is well it is published live. Needless to say some bugs do get through. I mentioned we should think about using unit tests - but she was all against it once it was realised more code would have to be written. This leaves me in the position of modifying something and not being sure the output is the same, especially as her code is spaghetti and I try to refactor it when I get a chance. So whats the best way forward for me?

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  • Test Data in a Distributed System

    - by Davin Tryon
    A question that has been vexing me lately has been about how to effectively test (end-to-end) features in a distributed system. Particuarly, how to effectively manage (through time) test data for feature testing. The system in question is a typical SOA setup. The composition is done in JavaScript when call to several REST APIs. Each service is built as an independent block. Each service has some kind of persistent storage (SQL Server in most cases). The main issue at the moment is how to approach test data when testing end-to-end features. Functional end-to-end testing occurs through the UI, and it is therefore necessary for test data to be set up before the test run (this could be manual or automated testing). As is typical in a distributed system, identifiers from one service are used as a link in another service. So, some level of synchronization needs to be present in the data to effectively test. What is the best way to manage and set up this data after a successful deployment to a test environment? For example, is it better to manage this test data inside each service? Or package it together with the testing suite? Does that testing suite exist as a separate project? I'm interested in design guidance about how to store and manage this test data as the application features evolve.

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  • How to popularize Nemerle (or another programming language)?

    - by keykeeper
    Any .NET developer who is interested in different programming languages knows that F# is the most popular functional language for the .NET platform nowadays. The only fact describing the popularity of F# is the great support of Microsoft. But we are not limited with F# at all. There are some other functional languages on the .NET platform. I'm very disappointed with the fact that Nemerle isn't well-known. It's an awesome language which supports three paradigms: object-oriented, functional and meta- programming. I won't try to explain why I like it so much. The problem is that I can't use it at work. I think that only really brave companies can rely on Nemerle. It's almost unknown, that's why it's hard to find new developers for the project. Noone wants to make a first step with Nemerle if it can influence the budget what is reasonable. So, here is a question: what can I do to make Nemerle more popular? Here are my first ideas: implement open-source projects using Nemerle; make presentations on different conferences; write articles.

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  • How common is prototyping as the first stage of development?

    - by EpsilonVector
    I've been taking some software design courses in the past few semesters, and while I see the benefit in a lot of the formalism, I feel like it doesn't tell me anything about the program itself: You can't tell how the program is going to operate from the Use Case spec, even though it discusses what the program can do. You can't tell anything about the user experience from the requirements document, even though it can include quality requirements. Sequence diagrams are a good description of how the software works as the call stack, but are very limited, and give a highly partial view of the overall system. Class diagrams are great for describing how the system is built, but are utterly useless in helping you figure out what the software needs to be. Where in all this formalism is the bottom line: how the program looks, operates, and what experience it gives? Doesn't it make more sense to design off of that? Isn't it better to figure out how the program should work via a prototype and strive to implement it for real? I know that I'm probably suffering from being taught engineering by theoreticians, but I need to ask, do they do this in the industry? How do people figure out what the program actually is, not what it should conform to? Do people prototype a lot, or do they mostly use the formal tools like UML and I just didn't get the hang of using them yet?

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  • Is it more valuable to double major in Computer Science/Software Engineering or get an undergraduate CS degree with a Masters in SE?

    - by Austin Hyde
    A friend and I (both in college) are currently in a debate over which is better, in terms of employment opportunities, experience, and education: a Bachelors degree in both Computer Science and Software Engineering, or a Bachelors in Computer Science with a Masters in Software Engineering. My point of view is that I would rather go to school for 4-4.5 years to learn both sides of the field, and be out working on real projects gaining real experience, by going the double major route. His point of view is that it would look better to potential employers if he had a Bachelors in CS and Masters in SE. That way, when he's finally done after 4 years of CS and 2-4 of SE (depending on where he goes), he can pretty much have his choosing of what he wants to do. We are both in agreement on the distinction between the two degrees: CS is "traditional" and about the theory of algorithms, data structures, and programming, where SE is the study of the design of software and the implementation of CS theory. So, what's your stance on this debate? Have you gone one route or another? And most importantly, why?

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  • How best to implement HTML5 support for my validation library

    - by Vivin Paliath
    I have created an annotation-based validation library called regula. There seems to be some amount of interest around the framework and the next thing I'd like to do is to support HTML5 validation. Originally I figured that I would check to see if the browser supported the HTML5 validation that has been specified and to either emulate or delegate to built-in regula equivalents. This is trivial for things like required, but once you start getting into the date-validation, it gets tricky (date widgets, localization, etc.). So I have a few options in front of me: Full HTML5 Shim along with widgets (for date stuff etc.): I feel like this is overkill and essentially reinventing the wheel since this is already covered by things like modernizr. Use HTML5 validation if available (either native, or provided by shim; otherwise ignore): What this means is that if HTML5 validation is available (natively or through a shim) I will use it, otherwise I will ignore it. I'm leaning towards the latter since currently if someone wants to use HTML5 validation, they will most probably require a shim since not all browsers support HTML5. Which option do you think is better?

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  • Solution with multiple projects and (GitHub) single issue tracker and repository

    - by Luiz Damim
    I have a Visual Studio solution with multiple projects: Acme.Core Acme.Core.Tests Acme.UI.MvcSite1 Acme.UI.MvcSite2 Acme.UI.WinformsApp1 Acme.UI.WinformsApp2 ... The entire solution is checked-in in a single GitHub (private) repo. Acme.Core contains our business logic and all UI projects are deployables. UI projects have different requirements and features, but some of them are implemented in more than one project. All issues are opened in a single issue tracker and classified using labels ([MvcSite1], [WinformsApp1], etc) but I'm thinking it's starting to get messy. Is it ok to use a single repository and issue tracker to track multiple projects in one solution?

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  • DOMDocument groupping nodes, with clone, nodeClone, importNode, fragment... What the better way?

    - by Peter Krauss
    A "DOMNodeList grouper" (groupList() function below) is a function that envelopes a set of nodes into a tag. Example: INPUT <root><b>10</b><a/><a>1</a><b>20</b><a>2</a></root> OUTPUT of groupList($dom->getElementsByTagName('a'),'G') <root><b>10</b> <G><a/><a>1</a><a>2</a></G> <b>20</b></root> There are many ways to implement it, what is the better? function groupList_v1(DOMNodeList &$list,$tag,&$dom) { $list = iterator_to_array($list); // to save itens $n = count($list); if ($n && $list[0]->nodeType==1) { $T = $dom->createDocumentFragment(); $T->appendChild($dom->createElement($tag)); for($i=0; $i<$n; $i++) { $T->firstChild->appendChild( clone $list[$i] ); if ($i) $list[$i]->parentNode->removeChild($list[$i]); } $dom->documentElement->replaceChild($T,$list[0]); }//if return $n; }//func function groupList_v2(DOMNodeList &$list,$tag,&$dom) { $list = iterator_to_array($list); // to save itens $n = count($list); if ($n && $list[0]->nodeType==1) { $T = $dom->createDocumentFragment(); $T->appendChild($dom->createElement($tag)); for($i=0; $i<$n; $i++) $T->firstChild->appendChild( clone $list[$i] ); $dom->documentElement->replaceChild($T,$list[0]); for($i=1; $i<$n; $i++) $list[$i]->parentNode->removeChild($list[$i]); }//if return $n; }//func // ... YOUR SUGGESTION ... // My ugliest function groupList_vN(DOMNodeList &$list,$tag,&$dom) { $list = iterator_to_array($list); // to save itens $n = count($list); if ($n && $list[0]->nodeType==1) { $d2 = new DOMDocument; $T = $d2->createElement($tag); for($i=0; $i<$n; $i++) $T->appendChild( $d2->importNode($list[$i], true) ); $dom->documentElement->replaceChild( $dom->importNode($T, true), $list[0] ); for($i=1; $i<$n; $i++) $list[$i]->parentNode->removeChild($list[$i]); }//if return $n; }//func Related questions: at stackoverflow, at codereview.

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  • Rights and use of developed software

    - by Nils Munch
    I have been working on a piece of software for a company, that they wish to resell. There was an mail-based agreement upon a flat hourly rate for my work, and eager me chose to accept a rather low fee. Due to the stress and tempo of the task, a direct contract was never formed or signed. The software was developed locally on my machine, and I was pretty much alone with it, except by excellent help from StackOverflow when I got stuck. Now, the software is nearing completion, I suddenly hear that they have hired a new developer to make the same piece of software as me, and that I was expected to resign within long. Confused I ask around, and realize that the CEO of the company had informed the rest of the company that I was terminally ill and had cancer, and was expected to leave the company soon. Since I'm perfectly healthy, this confused me even more, until I realized what was going on. When I confronted my boss with this, I was no longer seen as a member of the company, and I left the same day, never to return. Later, I raised the question about my missing pay, since I had been working for quite a bit, and not received any payment for my software. I saw that they had already sold a fair copy of my software, and since it's not exactly sold cheap, the company should have plenty of gold to pay me. The company refused, and said that they owned the software, and everything it contained. That was a lot of drama, but my question is this: Who has the rights to the software ? The source code had my personal watermarks and copyrights inprinted, but they have since simply deleted it. The company claim that they have all the rights, because they have a website made about the product, where they write that they have "All rights reserved" in the bottom. My instinct tells me that if a company buys a service like this, and then refuses to pay their developer, then they should not be allowed to keep, and much less resell the product. I have not signed any agreements about giving the company the use of this product, I have made it in my own time and without help from the rest of the company. This all takes place in Denmark, Europe, but I would guess that the rules about this is somewhat universal. Im not the strongest person to legal-talk, so I might be wrong.

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  • Stagnating in programming

    - by Coder
    Time after time this question came up in my mind, but up until today I wasn't thinking about it much. I have been programming for maybe around 8 years now, and for the last two years it seems I'm not as keen to pick up new technologies anymore. Maybe that's a burnout or something, but I'd say it's experience and what I like, that's stopping me from running after the latest and greatest. I'm C++ developer, by this I mean, I love close to metal programming. I have no problems tracing problems through assembly, using tools like WinDbg or HexView. When I use constructs, I think about how they are realized underneath, how the bits are set and unset under the hood. I love battling with complex threading problems and doing everything hardcore way, even by hand if the regular solutions seem half baked. But I also love the C++0x stuff, and use it a lot. And all C++ code as long as it's not cumbersome compared to C counterparts, sometimes I also fall back to sort of "Super C" if the C++ way is ugly. And then there are all other developers who seem to be way more forward looking, .Net 4.0 MVC, WPF, all those Microsoft X#s, LINQ languages, XML and XSLT, mobile devices and so on. I have done a considerable amount of .NET, SQL, ASPX programming, but the further I go, the less I want to try those technologies. Is that bad? Almost every day I hear people saying that managed code is the only way forward, WPF is the way to go. I hear that C++ is godawful, and you can't code anything in it that's somewhat stable. But I don't buy it. With the experience I have, and the knowledge of how native code is compiled and executes, I can say I find it extremely rare that C++ code is unstable, or leaks, or causes crashes that takes more than 30 seconds to identify and fix. And to tell the truth, I've seen enough problems with other "cool" languages that I'd say C++ is even more stable and production proof than the safe languages, at least for me. The only thing that scares me in C++ is new frameworks, I don't trust them, and I use them extra sparingly. STL - yes, ATL - very sparingly, everything else... Well, not very keen on it. Most huge problems I've ran into, all were related to frameworks, not the language itself. Some overrided operator here, bad hierarchy there, poor class design here, mystical castings there. Other than that, C/C++ (yes, I use them together) still seems a very controlled and stable way to develop applications. Am I stagnating? Should I switch a profession, or force myself in all that marketing hype? Are there more developers who feel the same way?

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