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  • Are there any "best practices" on cross-device development?

    - by vstrien
    Developing for smartphones in the way the industry is currently doing is relatively new. Of course, there has been enterprise-level mobile development for several decades. The platforms have changed, however. Think of: from stylus-input to touch-input (different screen res, different control layout etc.) new ways of handling multi-tasking on mobile platforms (e.g. WP7's "tombstoning") The way these platforms work aren't totally new (iPhone has been around for quite awhile now for example), but at the moment when developing a functionally equal application for both desktop and smartphone it comes down to developing two applications from ground up. Especially with the birth of Windows Phone with the .NET-platform on board and using Silverlight as UI-language, it's becoming appealing to promote the re-use of (parts of the UI). Still, it's fairly obvious that the needs of an application on a smartphone (or tablet) are very different compared to the needs of a desktop application. An (almost) one-on-one conversion will therefore be impossible. My question: are there "best practices", pitfalls etc. documented about developing "cross-device" applications (for example, developing an app for both the desktop and the smartphone/tablet)? I've been looking at weblogs, scientific papers and more for a week or so, but what I've found so far is only about "migratory interfaces".

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  • DBMS agnostic - What to name the COUNT column from a SQL Query

    - by cyberkiwi
    I have trouble naming the COUNT() column from SQL queries and will swap between various variants _Count [Count] (sql, or "count" or backticks for MySQL etc) C Cnt CountSomething (where "something" is the field being counted, or "CountAll") NoOfRows RowCount etc Has anyone come up with any name that you are happy with and always use without hesitation? This is bothering me because after joining SO just recently, my answers have shown this tendency of flip-flopping with no consistency. I need to get this sorted. Please help. (While we're at it, what do you use for SUM etc?) Note: Before you close this question, consider that this one was not: What's the best name for a non-mutating “add” method on an immutable collection?

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  • What does "context-free" mean in the term "context-free grammar"?

    - by rick
    Given the amount of material that tries to explain what a context-free grammar (CFG) is, I found it surprising that very few (in my sample, less than 1 in 20) give an explanation on why such grammars are called "context-free". And, to my mind, none succeeds in doing so. My question is, why are context-free grammars called context-free? What is "the context"? I had an intuition that the context could be other language constructs surrounding the currently analyzed construct, but that seems not to be the case. Could anyone provide a precise explanation?

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  • [PHP] Version Changes: How considerable are the compatibility issues in project?

    - by AdityaGameProgrammer
    For example if we consider ActionScript2.0(based on Objects but programming does not implement much OOP ) vs 3.0(highly OOP) its like a whole new scripting language in the sense of approach, programming style,features you get the idea. In PHP we can see current versions going from 3-5. brief version changes Question :Developers who work on PHP is it easy to migrate from version to version? Question :Are there any extensive compatibility issues, forward or backward? Question :Does your project stick to a particular version till the end ? Question :Does the programming style ,approach change from version to version? Question :If you had to get started on PHP to contribute to a project built earlier versions, would learning the latest version be counterproductive towards this aim? Some related topics i had come across on SE How should I be keeping track of php script version/changes? What is happening to PHP 6? It would be Really helpful in understanding if you could answer this topic directly to the questions put forth.

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  • How lookaheads are propagated in "channel" method of building LALR parser?

    - by greenoldman
    The method is described in Dragon Book, however I read about it in ""Parsing Techniques" by D.Grune and C.J.H.Jacobs". I start from my understanding of building channels for NFA: channels are built once, they are like water channels with current you "drop" lookahead symbols in right places (sources) of the channel, and they propagate with "current" when symbol propagates, there are no barriers (the only sufficient things for propagation are presence of channel and direction/current); i.e. lookahead cannot just die out of the blue Is that right? If I am correct, then eof lookahead should be present in all states, because the source of it is the start production, and all other production states are reachable from start state. How the DFA is made out of this NFA is not perfectly clear for me -- the authors of the mentioned book write about preserving channels, but I see no purpose, if you propagated lookaheads. If the channels have to be preserved, are they cut off from the source if the DFA state does not include source NFA state? I assume no -- the channels still runs between DFA states, not only within given DFA state. In the effect eof should still be present in all items in all states. But when you take a look at DFA presented in book (pdf is from errata): DFA for LALR (fig. 9.34 in the book, p.301) you will see there are items without eof in lookahead. The grammar for this DFA is: S -> E E -> E - T E -> T T -> ( E ) T -> n So how it was computed, when eof was dropped, and on what condition? Update It is textual pdf, so two interesting states (in DFA; # is eof): State 1: S--- >•E[#] E--- >•E-T[#-] E--- >•T[#-] T--- >•n[#-] T--- >•(E)[#-] State 6: T--- >(•E)[#-)] E--- >•E-T[-)] E--- >•T[-)] T--- >•n[-)] T--- >•(E)[-)] Arc from 1 to 6 is labeled (.

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  • Pursuing violators of software license/copyright

    - by Dmitry Brant
    I've recently discovered a seller on eBay who is selling CDs with my (trialware) software on it. The seller is clearly trying to pass the software off as his own; he's copied all the verbiage from my software's website, except its actual name. This seller also sells a whole bunch of other CDs with free software for which he's misrepresenting authorship. For example, this listing contains screen shots that are obviously of the free program InfraRecorder. However, the name InfraRecorder or its authors aren't mentioned anywhere. Before I splurge on official legal assistance, does the community have any recommendations or past experiences with these kinds of matters? What's the best way to proceed, and at the very least, have the eBay listings taken down? Is it possible to reclaim the earnings from the sales of these CDs (not just for me, but for the other authors of the free software that this person is selling)? I realize that GPL'd software doesn't have any restrictions on "selling" the software, but this person has gone to great lengths to obfuscate the software's authorship, which is surely a violation of the license. (My software is not GPL; it's a custom license, and it does not permit redistribution of any kind without permission)

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  • How do I account for changed or forgotten tasks in an estimate?

    - by Andrew
    To handle task-level estimates and time reporting, I have been using (roughly) the technique that Steve McConnell describes in Chapter 10 of Software Estimation. Specifically, when the time comes for me to create task-level estimates (right before coding begins on a project), I determine the tasks at a fairly granular level so that, whenever possible, I have no tasks with a single-point, 50%-confidence estimate greater than four hours. That way, the task estimation process helps with constructing the software while helping me not to forget tasks during estimation. I come up with a range of hours possible for each task also, and using the statistical calculations that McConnell describes along with my historical accuracy data, I can generate estimates at other confidence levels when desired. I feel like this method has been working fairly well for me. We are required to put tasks and their estimates into TFS for tracking, so I use the estimates at the percentage of confidence I am told to use. I am unsure, however, what to do when I do forget a task, or I end up needing to do work that does not neatly fall within one of the tasks I estimated. Of course, trying to avoid this situation is best, but how do I account for forgotten/changed tasks? I want to have the best historical data I can to help me with future estimates, but right now, I basically am just calculating whether I made the 50%-confidence estimate and whether I made it inside the ranged estimate. I'll be happy to clarify what I'm asking if needed -- let me know what is unclear.

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  • Starting a career in mobile development in next 5 months?

    - by Jungle Hunter
    I will be starting my career shortly and have the opportunity to being my career in mobility. I have an option to be in more traditional fields (the ones that have been around for quite some time now like web development and Java apps development). What are the pros and cons of both? Also, if I do choose mobility, then I might be presented with the option of iOS or Android. Pros and cons of choosing each? Period: Joining in next 5 months. Mobility company profile: Major consulting company.

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  • Establishing relationships with unsolicited recruiters

    - by Michael
    Several times each year, I receive unsolicited introductions from tech recruiters, usually via LinkedIn and usually local firms. I am not currently looking for a new job. Is it advisable to establish a relationship with one or more recruiters when I'm not interested in finding new work, so that they have my resume on file? Here's another way I approach the question: My plumber was first hired at the point of need: I had a plumbing problem, looked up a few of them, and evaluated and hired based on their demeanor and cost estimates. I established a relationship with a general attorney, on the other hand, well in advance of ever actually needing services so that if or when services are needed he already knows enough about me to begin work. Should I approach recruiters like I approached my plumber or my lawyer? A separate discussion, I suppose, is whether or not the type of recruiters who troll LinkedIn for clients are generally helpful or not. Edit: I have never worked with a recruiter before, and therefore have little idea what to expect.

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  • Best Java Book(s) for an Experienced Developer

    - by Steven Elliott Jr
    I have been a .NET developer now for about the past 5/6 years give or take. I have never done any professional Java development and the last time I really touched it was probably back in college. I have been toying with the Scala language a little bit but nothing serious. Recently, I've been offered an opportunity to do some pretty cool work, but using Java instead of .NET. I think I can get by alright with my current skill set, meaning I already know how to program well and am familiar with languages such as C# and C++, etc. So, the syntax and all that language stuff are really not a problem. What I need is a really good reference book and a book about how to think in Java. Each language/Framework/Stack tries to address things a certain way and I'm sure Java is no different. What are some great Java books that you simply can't live without? Are there any books that talk about the most important parts of Java that must be understood before all else? As a side note, I will be doing mostly Java web development. Not really 100% on what types of stuff they are using for persistence, framework, server, etc. Thanks again for the consideration.

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  • Proposal for a new position at work

    - by Seth P.
    I have an idea at work for a new Product Manager position at our office. I work with several developers, and it would be helpful to have someone working in a type of "Scrum Master" capacity, dividing out assignments and making sure they get complete. This position does not currently exist, however I feel that I have enough evidence to indicate that it be very helpful for our business. What is the best way to present this proposal to my boss? Is there a specific template that you know of for new position? It should be able to describe the qualification for the position, their responsibilities, and what metrics we would use to measure them. Thanks. UPDATE++++ With Anna's suggestion, I gave more details about this specific position. However, I would ideally like the most generic way to present a new position to my boss.

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  • Dynamic vs Statically typed languages for websites

    - by Bradford
    Wanted to hear what others thought about this statement: I’ll contrast that with building a website. When rendering web pages, often you have very many components interacting on a web page. You have buttons over here and little widgets over there and there are dozens of them on a webpage, as well as possibly dozens or hundreds of web pages on your website that are all dynamic. With a system with a really large surface area like that, using a statically typed language is actually quite inflexible. I would find it painful probably to program in Scala and render a web page with it, when I want to interactively push around buttons and what-not. If the whole system has to be coherent, like the whole system has to type check just to be able to move a button around, I think that can be really inflexible. Source: http://www.infoq.com/interviews/kallen-scala-twitter

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  • Are #regions an antipattern or code smell?

    - by Craig
    In C# code it allows the #region/#endregion keywords to made areas of code collapsible in the editor. Whenever I am doing this though I find it is to hide large chunks of code that could probably be refactored into other classes or methods. For example I have seen methods that contain 500 lines of code with 3 or 4 regions just to make it manageable. So is judicious use of regions a sign of trouble? It seems to be to me.

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  • Why do some people hate Dart? [closed]

    - by Hassan
    First, I'd like to note that this question is not intended to compare two languages or technologies, but is only asking about criticisms aimed at a language. I've always thought it a good idea to somehow get rid of Javascript. It works, but it's just so messy. I think many will agree with me there. And that's how I interpreted Google's release of Dart. It seems to me like a very good alternative to Javascript. Now, it looks like some are not very happy that Google has released this new language. Take a look at this Wikipedia page to see what I'm talking about. If you don't feel like reading it, I'll tell you now that some seem to think that Dart is similar to Microsoft's VBScript, in that it only works on Microsoft's browsers. This goes against the web's openness. But it's my understanding that Dart can be compiled to Javascript, which will allow it to be run on any modern browser (as the Wikipedia article also states). So my question is: are these criticisms valid? Is there a real fear that Google is trying to control the web's front-end to be more compatible with its browser?

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  • How do you manage extensibility in your multi-tenant systems?

    - by Brian MacKay
    I've got a few big web based multi-tenant products now, and very soon I can see that there will be a lot of customizations that are tenant specific. An extra field here or there, maybe an extra page or some extra logic in the middle of a workflow - that sort of thing. Some of these customizations can be rolled into the core product, and that's great. Some of them are highly specific and would get in everyone else's way. I have a few ideas in mind for managing this, but none of them seem to scale well. The obvious solution is to introduce a ton of client-level settings, allowing various 'features' to be enabled on per-client basis. The downside with that, of course, is massive complexity and clutter. You could introduce a truly huge number of settings, and over time various types of logic (presentation, business) could get way out of hand. Then there's the problem of client-specific fields, which begs for something cleaner than just adding a bunch of nullable fields to the existing tables. So what are people doing to manage this? Force.com seems to be the master of extensibility; obviously they've created a platform from the ground up that is super extensible. You can add on to almost anything with their web-based UI. FogBugz did something similiar where they created a robust plugin model that, come to think of it, might have actually been inspired by Force. I know they spent a lot of time and money on it and if I'm not mistaken the intention was to actually use it internally for future product development. Sounds like the kind of thing I could be tempted to build but probably shouldn't. :) Is a massive investment in pluggable architecture the only way to go? How are you managing these problems, and what kind of results are you seeing? EDIT: It does look as though FogBugz handled the problem by building a fairly robust platform and then using that to put together their screens. To extend it you create a DLL containing classes that implement interfaces like ISearchScreenGridColumn, and that becomes a module. I'm sure it was tremendously expensive to build considering that they have a large of devs and they worked on it for months, plus their surface area is perhaps 5% of the size of my application. Right now I am seriously wondering if Force.com is the right way to handle this. And I am a hard core ASP.Net guy, so this is a strange position to find myself in.

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  • How to solve SocketException: Permission denied: connect

    - by luxinxian
    I recently encountered a problem getting a headache, need help... System consists of: Two subsystems, called A, B (each running on a standalone tomcat instance), currently running on the same machine. A invoke B's service via spring httpInvoker(http). B system also invoke other system's services via http. Symptoms: 1, the system starts to run normally after 10-15 days; 2, the system will run for a period of time after an exception: org.springframework.remoting.RemoteAccessException: Could not access HTTP invoker remote service at [http://xxx.xxx.xxx.xxx/remoting/call]; nested exception is java. net.SocketException: Permission denied: connect 3, when the exception occour, it continues, not only occasional .(it looks like some resources exhausted, but cpu rate < 5%, memory < 15%, network < 5%) 4, A, B when the system call fails, B system via http call to an external service also failed for the same exception. 5, closed two tomcat services, restart, and working properly. So repeatedly (step 1 - 5), has not found the root reason. Emvironment: windows 2008 R2 tomcat7.0.42 x86_64 oralce-jdk-1.7.0_40 Any ideas?

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  • Audio Panning using RtAudio

    - by user1801724
    I use the RtAudio library. I would like to implement an audio program where I can control the panning (e.g. shifting the sound from the left channel to the right channel). In my specific case, I use RtAudio in duplex mode (you can find an example here: duplex mode). It means that I link the microphone input to the speaker output. I have searched on the web, but I did not find anything useful. Should I apply a filter on the output buffer? What kind of filter?

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  • What is the oldest living piece of unaltered production code? [closed]

    - by user1598390
    It's come to my mind that parts of the code in, say, Unix, has maybe passed unaltered from one version or flavor into another. Maybe some pieces of the source code of the ls command is the same, unaltered, than was written years ago. Have any of you read or learn about this ? What would be the oldest living piece of unaltered production code still running, passing from version through version of a program or system ? Will the code we write outlive us for decades ?

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  • Configure Jenkins and Tomcat using Puppet

    - by ex3v
    I'm trying to setup Spring dev environment (jenkins, tomcat) on Vagrant. What I really want to achieve is to limit config to only Puppet scripts, so I can share it with my colleagues and work together on the same environment. So far I managed to set up simple scripts to install jenkins, tomcat and so on, they work fine. What about jenkins configuration though? I'm pretty green in jenkins usage and configuration, not sure if I'm doing it the right way... I found this article and I want to migrate whole setup described in it to Puppet. Any ideas? Thanks.

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  • Help me classify this type of software architecture

    - by Alex Burtsev
    I read some books about software architecture as we are using it in our project but I can't classify the architecture properly. It's some kind of Enterprise Architecture, but what exactly... SOA, ESB (Enterprise Service Bus), Message Bus, Event Driven SOA, there are so many terms in Enterprise software.... The system is based on custom XML messages exchanges between services. (it's not SOAP, nor any other XML based standard, just plain XML). These messages represent notifications (state changes) that are applied to the Domain model, (it's not like CRUD when you serialize the whole domain object, and pass it to service for persistence). The system is centralized, and system participants use different programming languages and frameworks (c++, c#, java). Also, messages are not processed at the moment they are received as they are stored first and the treatment begins on demand. It's called SOA+EDA -:)

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  • What is the best retort to "premature optimization is the root of all evil"

    - by waffles
    Often I hear the sentiment ... "Why worry about performance, write slow code, get your product to market ... don't worry about performance. You can sort that out later" The culmination of this sentiment is: "... premature optimization is the root of all evil ... #winning" I was wondering, does anybody have a good retort to this one liner. Ideally an equally strong one liner that encompasses the reverse of this sentiment?

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  • Ruby on Rails background API polling

    - by Matthew Turney
    I need to integrate a free/busy calendar integration with Zimbra. Unlike outlook, it seems, Zimbra requires polling their API. I need to be able to grab the free/busy data in background tasks for 10's of thousands of users on a regular time interval, preferably every few minutes. What would be the best way to implement this in a Rails application without bogging down our current resque tasks? I have considered moving this process to something like node.js or something similar in Ruby. The biggest problem is that we have no control over the IO, as each clients Zimbra instances could be slow and we don't want to create a huge backup in tasks. Thoughts and ideas?

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  • Developing a php system that tracks other websites analytics

    - by CodeCrack
    I want to develop a PHP website feature where users sign up, get a javascript snippet code that display an image on their site, and let's me track the number of visitors, unique hits, clicks and average visitor duration on their page. Is that something that should be done with some open source analytic software such as http://piwik.org/ or it's pretty doable on your own? If I had to do it myself from scratch, I would use image/pixel as a way to track the visit, drop a cookie with javascript snippet to track uniques, track clicks based on image click and redirect, and not sure about the bounce rate. Any thoughts or opinions are welcome.

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  • OpenGL CPU vs. GPU

    - by Nitrex88
    So I've always been under the impression that doing work on the GPU is always faster than on the CPU. Because of this, in OpenGL, I usually try to do intensive tasks in shaders so they get the speed boost from the GPU. However, now I'm starting to realize that some things simply work better on the CPU and actually perform worse on the GPU (particularly when a geometry shader is involved). For example, in a recent project I did involving procedurally generated terrain, I tried passing a grid of single triangles into a geometry shader, and tesselated each of these triangles into quads with 400 vertices whose height was determined by a noise function. This worked fine, and looked great, but easily maxed out the GPU with only 25 base triangles and caused a very slow framerate. I then discovered that tesselating on the CPU instead, and setting the height (using noise function) in the vertex shader was actually faster! This prompted me to question the benefits of using the GPU as much as possible... So, I was wondering if someone could describe the general pros and cons of using the GPU vs CPU for intensive graphics tasks. I know this mainly comes down to what your trying to achieve, so if necessary, use the above scenario to discuss why the "CPU + vertex shader" was actually faster than doing everything in the geometry shader on the GPU. It's possible my hardware (newest macbook pro) isn't optomized well for the geometry shader (thus causing the slow framerate). Also, I read that the vertex shader is very good with parallelism, and would love a quick explanation of how this may have played a role in speeding up my procedural terrain. Any info/advice about CPU/GPU/shaders would be awesome!

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  • Why is it java code indented as BSD KNF Style and C C++ code indented as Allman or BSD style?

    - by Caffeine
    I do understand that coding convention is a matter of preference, and that different coding conventions have different subtle advantages or shortcomings, and depending on what one wants, one should choose his/her style. But why is usually Java written where the opening brace is on the same line as the function definition of control statement, and in C or C++ the curly braces have a line of their own? BSD KNF style if (data != NULL && res > 0) { if (JS_DefineProperty(cx, o, "data", STRING_TO_JSVAL(JS_NewStringCopyN(cx, data, res)), NULL, NULL, JSPROP_ENUMERATE) != 0) { QUEUE_EXCEPTION("Internal error!"); goto err; } PQfreemem(data); } else { if (JS_DefineProperty(cx, o, "data", OBJECT_TO_JSVAL(NULL), NULL, NULL, JSPROP_ENUMERATE) != 0) { QUEUE_EXCEPTION("Internal error!"); goto err; } } Allman or BSD Style if (x == y) { something(); somethingelse(); } Courtesy: http://en.wikipedia.org/wiki/Indent_style

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