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  • What is the need for 'discoverability' in a REST API when the clients are not advanced enough to make use of it anyway?

    - by aditya menon
    The various talks I have watched and tutorials I scanned on REST seem to stress something called 'discoverability'. To my limited understanding, the term seems to mean that a client should be able to go to http://URL - and automatically get a list of things it can do. What I am having trouble understanding - is that 'software clients' are not human beings. They are just programs that do not have the intuitive knowledge to understand what exactly to do with the links provided. Only people can go to a website and make sense of the text and links presented and act on it. So what is the point of discoverability, when the client code that accesses such discoverable URLs cannot actually do anything with it, unless the human developer of the client actually experiments with the resources presented? This looks like the exact same thing as defining the set of available functions in a Documentation manual, just from a different direction and actually involving more work for the developer. Why is this second approach of pre-defining what can be done in a document external to the actual REST resources, considered inferior?

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  • How does the GPL static vs. dynamic linking rule apply to interpreted languages?

    - by ekolis
    In my understanding, the GPL prohibits static linking from non-GPL code to GPL code, but permits dynamic linking from non-GPL code to GPL code. So which is it when the code in question is not linked at all because the code is written in an interpreted language (e.g. Perl)? It would seem to be too easy to exploit the rule if it was considered dynamic linking, but on the other hand, it would also seem to be impossible to legally reference GPL code from non-GPL code if it was considered static! Compiled languages at least have a distinction between static and dynamic linking, but when all "linking" is just running scripts, it's impossible to tell what the intent is without an explicit license! Or is my understanding of this issue incorrect, rendering the question moot? I've also heard of a "classpath exception" which involves dynamic linking; is that not part of the GPL but instead something that can be added on to it, so dynamic linking is only allowed when the license includes this exception?

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  • Is the abundance of Frameworks dumbing down programmers?

    - by Gratzy
    With all of the frameworks available these days ORM's DI/IoC etc. I find that many programmers are losing or don't have the problem solving skills needed to solve difficult issues. I've seen many times unexpected behaviour creep into applications and the developers unable to really dig in and find the issues. It seems to me that deep understanding of whats going on under the hood is being lost. Don't get me wrong, I'm not suggesting these frameworks aren't good and haven't moved the industry forward, only asking if as a unintended consequence developers aren't gaining the knowledge and skill needed for deep understanding of systems.

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  • How to increase the bus factor and specialize at the same time?

    - by bizso09
    In agile pair programming it is recommended to switch pairs every now and then so as to increase the bus factor of the team. That means, most people in the team should work on different parts of the system at different times so that everyone has an understanding of it. Now it is impssible that everyone has an expert level of understanding of each part of the system. That's because people are urged to specialize in one area of expertise. If you are an expert database admin, what's the point of working on the user interface of the system when you switch pairs? You will not be able to do such a high quality job as someone who has extensive experience in UI design. How can you increase the bus factor and make sure that you have specialization in your team?

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  • Common mistakes made by new programmers without CS backgrounds [on hold]

    - by mblinn
    I've noticed that there seems to be a class of mistakes that new programmers without CS backgrounds tend to make, that programmers with CS backgrounds tend not to. I'm not talking about not understanding source control, or how to design large programs, or a whole host of other things that both freshly minted CS graduates and non-CS graduates tend to not understand, I'm talking about basic mistakes that having a CS background will prevent a programmer from making. One obvious and well trod example is that folks who don't have a basic understanding of formal languages will often try to parse arbitrary HTML or XML using regular expressions, and possibly summon Cthulu in the process. Another fairly common one that I've seen is using common data structures in suboptimal ways like using a vector and a search function as if it were a hash map. What sorts of other things along these lines would you look out for when on-boarding a batch of newly minted, non-CS programmers.

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  • What is So Unique About Node.js?

    - by Adrian Shum
    Recently there has been a lot of praise for Node.js. I am not a developer that has had much exposure to network application. From my bare understanding of Nodes.js, its strength is: we have only one thread handling multiple connections, providing an event-based architecture. However, for example in Java, I can create only one thread using NIO/AIO (which is non-blocking APIs from my bare understanding), and handle multiple connections using that thread, and I provide an event-based architecture to implement the data handling logic (shouldn't be that difficult by providing some callback etc) ? Given JVM being a even more mature VM than V8 (I expect it to run faster too), and event-based handling architecture seems to be something not difficult to create, I am not sure why Node.js is attracting so much attention. Did I miss some important points?

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  • Error Handling for Application in PHP

    - by Zubair1
    I was wondering if someone can show me a good way to handle errors in my PHP app, that i am also easily able to reuse in my codes. So far i have been using the following functions: Inline Errors function display_errors_for($fieldname) { global $errors; if (isset($errors[$fieldname])) { return '<label for="' .$fieldname. '" class="error">' . ucfirst($errors[$fieldname]). '</label>'; } else { return false; } } All Errrors function display_all_errors($showCounter = true) { global $errors; $counter = 0; foreach ($errors as $errorFieldName => $errorText) { if ($showCounter == true) { $counter++; echo '<li>' . $counter . ' - <label for="' .$errorFieldName. '">' .$errorText. '</label></li>'; } else { echo '<li><label for="' .$errorFieldName. '">' .$errorText. '</label></li>'; } } } I have a $errors = array(); defined on the top of my global file, so it is appended to all files. The way i use it is that if i encounter an error, i push a new error key/value to the $errors array holder, something like the following: if (strlen($username) < 3) { $errors['username'] = "usernames cannot be less then 3 characters."; } This all works great and all, But i wondering if some one has a better approach for this? with classes? i don't think i want to use Exceptions with try/catch seems like an overkill to me. I'm planning to make a new app, and i'll be getting my hands wet with OOP alot, though i have already made apps using OOP but this time i'm planning to go even deeper and use OOP approach more extensively. What i have in mind is something like this, though its just a basic class i will add further detail to it as i go deeper and deeper in my app to see what it needs. class Errors { public $errors = array(); public function __construct() { // Initialize Default Values // Initialize Methods } public function __destruct() { //nothing here too... } public function add($errorField, $errorDesc) { if (!is_string($errorField)) return false; if (!is_string($errorDesc)) return false; $this->errors[$errorField] = $errorDesc; } public function display($errorsArray) { // code to iterate through the array and display all errors. } } Please share your thoughts, if this is a good way to make a reusable class to store and display errors for an entire app, or is getting more familiar with exceptions and try/catch my only choice?

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  • AVIO Academy - ADF w/Oracle BPM

    - by BPMWarrior
    Oracle Platinum Partner AVIO Consulting is excited to announce the launch of the industry’s first ADF with Oracle BPM developer training program.  This training program is for any prospects or customers that could benefit from a better understanding of Oracle ADF and Oracle BPM.    Visit the AVIO Academy website for an in-depth description of the new ADF with Oracle BPM Workshop .     What it is: ·         Industry’s first ADF with Oracle BPM training program ·         3-day workshop showcasing application development using ADF with Oracle BPM Suite   Training Purpose: Teaches developers how to use Oracle Application Development Framework (ADF) with the Oracle Business Process Management (BPM) Suite.  The workshop is the only one of its kind on the market today.  During the course, students gain a better understanding of Oracle ADF, and the nuances of making it work with Oracle BPM.   Course Overview This course in AVIO’s BPM series, consists of 11 hands-on lessons designed specifically for developers.   It provides a comprehensive overview of ADF and Oracle BPM concepts, and step-by-step easy to follow instructions for creating and integrating ADF user interfaces with Oracle BPM processes.  Students leave the workshop with the working versions of the projects they build for their future reference.  Rather than just frantically clicking through the lessons, concepts are thoroughly explained and demonstrated.  Students leave understanding the best practices AVIO established during years of developing ADF solutions for Oracle BPM and SOA.   AVIO Academy This new workshop is offered through AVIO Academy, the only program with curriculum specifically developed for the most recent version of the Oracle BPM Suite. The academy specializes in hands-on role based training that uses an organization’s own processes for a more practical learning experience.   Visit the AVIO Academy website for an in-depth description of the new ADF with Oracle BPM Workshop. If you have any questions please contact Brandon Dean at [email protected]

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  • Why Nodes.js being that "unique"?

    - by Adrian Shum
    Recently years there are lots of praise to Nodes.js. I am not a developer that have much exposure on network application. From my bare understanding of Nodes.js, its strength is: We are having only on thread handling multiple connections, providing a event-based architecture. However, for example in Java, what if I am having only one thread, using NIO/AIO (which is non-blocking APIs from my bare understanding), and handle multiple connections using that thread, and I provide an event-based architecture to implement the data handling logic (shouldn't be that difficult by providing some callback etc) ? Given JVM being a even more mature VM than V8 (I expect it run faster too), and event-based handling architecture seems not something difficult to create. I am not sure why Nodes.js is attracting so much attention. Did I miss some important points?

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  • Spring vs Hibernate

    - by Vidar
    Just trying to get my head round Spring and figuring out how I wire up an Oracle connection in xml config file, and now find out I need yet another framework! - Hibernate, this is soooo frustrating as it feels like I'm getting deeper and deeper into more and more frameworks without actually getting what I need done! I looked at Hibernate and it seems to do similar things to Spring, bearing in mind I just want to do some SQL inserts in Oracle. I am reluctant and do not have time to learn 2 frameworks - could I get away with just adopting Hibernate for the simple things I need to do?

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  • Data Model Dissonance

    - by Tony Davis
    So often at the start of the development of database applications, there is a premature rush to the keyboard. Unless, before we get there, we’ve mapped out and agreed the three data models, the Conceptual, the Logical and the Physical, then the inevitable refactoring will dog development work. It pays to get the data models sorted out up-front, however ‘agile’ you profess to be. The hardest model to get right, the most misunderstood, and the one most neglected by the various modeling tools, is the conceptual data model, and yet it is critical to all that follows. The conceptual model distils what the business understands about itself, and the way it operates. It represents the business rules that govern the required data, its constraints and its properties. The conceptual model uses the terminology of the business and defines the most important entities and their inter-relationships. Don’t assume that the organization’s understanding of these business rules is consistent or accurate. Too often, one department has a subtly different understanding of what an entity means and what it stores, from another. If our conceptual data model fails to resolve such inconsistencies, it will reduce data quality. If we don’t collect and measure the raw data in a consistent way across the whole business, how can we hope to perform meaningful aggregation? The conceptual data model has more to do with business than technology, and as such, developers often regard it as a worthy but rather arcane ceremony like saluting the flag or only eating fish on Friday. However, the consequences of getting it wrong have a direct and painful impact on many aspects of the project. If you adopt a silo-based (a.k.a. Domain driven) approach to development), you are still likely to suffer by starting with an incomplete knowledge of the domain. Even when you have surmounted these problems so that the data entities accurately reflect the business domain that the application represents, there are likely to be dire consequences from abandoning the goal of a shared, enterprise-wide understanding of the business. In reading this, you may recall experiences of the consequence of getting the conceptual data model wrong. I believe that Phil Factor, for example, witnessed the abandonment of a multi-million dollar banking project due to an inadequate conceptual analysis of how the bank defined a ‘customer’. We’d love to hear of any examples you know of development projects poleaxed by errors in the conceptual data model. Cheers, Tony

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  • Confusion about Rotation matrices from Euler Angles

    - by xEnOn
    I am trying to learn more about Euler Angles so as to help myself in understanding how I can control my camera better in the game. I came across the following formula that converts Euler Angles to rotation matrices: In the equation, I could see that the first matrix from the left is the rotation matrix about x-axis, the second is about y-axis and the third is about z-axis. From my understanding about ordinary matrix transformations, the later transformation is always applied to the right hand side. And if I'm right about this, then the above equation should have a rotation order starting from rotating about z-axis, y-axis, then finally x-axis. But, from the symbols it seems that the rotation order start rotating about x-axis, then y-axis, then finally z-axis. What should the actual order of the rotation be? Also, I am confuse about if the input vector, in this case, would be a row vector on the left, or a column vector on the right?

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  • Sample code and slides for my TechDays10 (Belgium) talks

    - by Laurent Bugnion
    The source code for my MVVM talk titled “Understanding the MVVM Pattern” given at TechDays 2010 in Antwerpen, Belgium, is available online. It is actually the same code than the MIX10 one, but I added the Windows Phone 7 MVVM Light application (available in the folder titled “Mix10.MvvmDemo2-End”. Note: before unpacking the zip file, you should right click on it, and select properties / Unblock. I also published the slides for my two talks: Understanding the MVVM Pattern A day in the life of a WPF/SL integrator As far as I know, the videos will be online soon, stay tuned and I will announce when it is the case. Get Started page for the MVVM Light Toolkit: http://www.galasoft.ch/mvvm/getstarted   Laurent Bugnion (GalaSoft) Subscribe | Twitter | Facebook | Flickr | LinkedIn

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  • Security &amp; Dev Opinions needed for 2013 Global Information Security Workforce study and have a chance to win an Ipad!

    - by SoftwareSecurity
    You have the opportunity to help guide the security profession world wide with your opinions and experiences by taking part in the 2013 edition of (ISC)2 Global Information Security Workforce Study and have the chance to win an Ipad!  This study will provide an understanding about upcoming trends, technologies, and visions that as technology professional you will be able to provide invaluable understanding.  The study is being conducted by Frost & Sullivan.  You can participate in the study by clicking here.  Read the last study that was conducted in 2011 and provided tremendous insight into upcoming Trends.  Software developers are encouraged to respond!

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  • Beginner's steps to game programming [on hold]

    - by CodeTrasher
    I have graduated from university less than 6 months ago and became a B.Eng in Software Engineering. I have moderate understanding of programming experience from languages like C++, Java and C#. But mostly on simple desktop and mobile applications. I've tried some simple Pong-like games but never finished even the smallest game. I have a couple of nice ideas growing (IMO, at least...) in my mind but don't really know where to begin. 2D is way to go, of course, at the beginning. I just want to hear from more experienced game devs how they started out. Should I make a rough outline of the core idea and mechanics and start working on a prototype of core gameplay? Or should I just practice more by making Pong, Asteroids and that sort of games and get an understanding of those before moving on? Thanks to all!

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  • Is there a canonical source for learning C# and .NET internals?

    - by ta269uec
    I have been a C++ programmer for last several years with a bit of C# here and there. In my latest job, I work heavily on C#. I picked most of my C# by following the code-base or random google searches on what I wanted to do at that point (like threading in C#). I feel a time has come to invest some time into understanding the language internals and also understanding the .NET framework from an architectural point of view. Can someone recommend the "gold standard" text/resource for accomplishing these? What about that resource makes it the best? What were your experiences with it?

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  • Oracle Event: Database Enterprise User Security

    - by user12603048
    One of the high-value benefits of an integrated Identity and Access Management platform is the ability to leverage a unified corporate directory as the primary authentication source for database access. On July 11, 2012 at 08:00 am PDT, Oracle will host a webcast showing how Enterprise User Security (EUS) can be used to externalize and centrally manage database users in a directory server. The webcast will briefly introduce EUS, followed by a detailed discussion about the various directory options that are supported, including integration with Microsoft Active Directory. We'll conclude how to avoid common pitfalls deploying EUS with directory services. Discussion topics will include Understanding EUS basics Understanding EUS and directory integration options Avoiding common EUS deployment mistakes Make sure to register and mark this date on your calendar! - Click here to register.

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  • What are you using the debugger for? [closed]

    - by Peter Gfader
    Some scenarios that I can think of: Reading/Understanding code Understanding the flow (what happens when) Stop program and see where it is up to a. Attach debugger b. Exception -- Debug Discover API Run to breakpoint and verify state The question got closed on SO, so I ask here... http://stackoverflow.com/questions/6462461/what-do-you-use-the-debugger-for What are you using the debugger for? Which scenario did you ran into, that you needed the debugger? Could you have done it differently?

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  • Is it possible to link a method marked with MethodImplOptions.InternalCall to its implementation?

    - by adrianbanks
    In trying to find the possible cause of an exception, I'm following a code path using Reflector. I've got deeper and deeper, but ended up at a method call that looks like: [MethodImpl(MethodImplOptions.InternalCall)] private extern void SomeMethod(int someParameter); This markup on the method tells the framework to call a C++ function somewhere. Is there any way to find out what method actually gets called, and in turn what else is likely to be called? NB: I don't really want to see the source code of this method, I just want to know the possible things that could throw the exception I am seeing that originates out of this method call.

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  • Windows 32-bit and 64-bit and GPT

    - by MrLane
    I know similar questions have been asked before across several sites, but the answers at least to me have been confusing and conflicting. My understanding has always been that 64-bit Windows will create and use GPT disks just fine, but will not boot from them without a UEFI BIOS. Also my understanding WAS that 32-bit Windows could not use GPT at all and so is always restricted to 2.2TB disks, which was another reason to move to 64-bit on top of the 4GB memory limit. But I have now read that this isn't correct: 32-bit Windows will create and use GPT disks just as 64-bit does. The only resriction is that you can't boot 32-bit Windows even if you DO have a UEFI BIOS? I don't think much of the literature has explained this well. There are several tools floating around for creating virtual disks or 2.2+.8GB partition schemes and such for 32-bit systems. Why when it seems you can use GPT in 32-bit Windows anyway. It also seems that people blame MS for lagging behind with respect to all of this: but it seems the issue is with BIOS manufactures not supporting UEFI rather than MS not supporting GPT... Is my new understanding now correct?

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  • Is domain-transfer inherently safe for downtime when the name servers remain the same?

    - by jlmt
    I've been reading around this topic towards understanding whether there's some or no chance of downtime during an upcoming domain transfer for 15 live and very critical domains. In our case there are three companies involved: CompanyA is the original registrar and DNS host, CompanyB is the new DNS host, and CompanyC is the new registrar. I've already changed the nameservers for all domains to those of CompanyB. We suffered some downtime because CompanyA deleted their hosted DNS for our domains directly after the change, but the changes propagated and we're now able to configure our DNS with CompanyB. From what I understand (please correct where wrong!): There exists an SOA record that points oneofourdomains.com to ns.companyb.com. That record is maintained and authoritatively hosted by the ccTLD registry for the domain (eg. Verisign for .com). CompanyA currently has the ability to change the SOA record because they're the registrar. There exist NS records for oneofourdomains.com, which are also related to the link from domain name to nameserver, are similarly hosted by the ccTLD, and which CompanyA are also able to change while acting as registrar. Neither CompanyB nor CompanyC currently have any control over the SOA or NS records. CompanyA are unable to cause us (DNS) problems during the transfer by dropping service early, because they are not the authoritative source for the SOA and NS records. When we transfer the domains, it's administrative control of the SOA and NS records that will be transferred to CompanyC. As long as we advise CompanyC that the SOA and NS records must not change (as regards pointing to CompanyB's nameservers), there's no need for any kind of DNS change, and therefore no possibility of downtime. Is my understanding of this correct? My fear is that CompanyA will somehow cut us off again, and their support dept hasn't given me much confidence in their understanding of the topic.

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