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• When using membership provider, do you use the user ID or the username?

  - by Chris

  I've come across this is in a couple of different applications that I've worked on. They all used the ASP.NET Membership Provider for user accounts and controlling access to certain areas, but when we've gotten down into the code I've noticed that in one we're passing around the string based user name, like "Ralph Waters", or we're passing around the Guid based user ID from the membership table. Now both seem to work. You can make methods which get by username, or get by user ID, but both have felt somewhat "funny". When you pass a string like "Ralph Waters" you're passing essentially two separate words that make up a unique identifier. And with a Guid, you're passing around a string/number combination which can be cast and made unique. So my question is this; when using Membership Provider, which do you use, the username or the user ID to get back to the user? Thanks all!

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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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• Languages on embedded systems in aeronautic and spatial sector

  - by Niels

  I know that my question is very broad but a general answer would be nice. I would like to know which are the main languages used in aeronautic and spatial sector. I know that the OS which run on embedded systems are RTOS (Real time OS) and I think that, this languages must be checked correctly by different methods (formal methods, unit tests) and must permit a sure verification of whole process of a program.

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• Do you think asking to sign contributor license agreement for a open source project creates a resistance for contributors?

  - by Appu

  I am working on a open-source project which is backed by an organization. Organization pays a team to make this open-source project. This project will be licensed with GPLv3. We are debating on having a CLA for contributors. Do you think mandating a CLA will reduce the number of contributors? I have observed that people have no issues in signing a CLA when the project is really popular. So do you think CLA will create a resistance to contribute?

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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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• Do real developers use UML and other CASE tools?

  - by Avi

  I'm a CS student, currently a junior, and in one of my classes this semester they have us studying all sorts of UML diagramming methods. Among others, we've touched on Petri nets, DFD diagrams, sequence diagrams, use case diagrams, collaboration diagrams, Jackson System Development diagrams, entity-relation diagrams, and more. I've worked on more than a few professional projects over the years and never encountered anyone who used these systems to any great degree (other than a general class diagram or a diagram of the tables in a database). I was just wondering if I could query the hive mind to see if this is true in your work experience too. Have you used these models at all and found them to be as important as they tell us students they are? Or is all this stuff just academic ivory-tower crap that people in the real world hardly ever touch? Which of these systems have you found to be effective and useful? Are there specific kinds of scenarios that they are more intended to be used in than what the typical software developer encounters?

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• Comunicate NodeJS and PHP

  - by Zenth

  i need ideas to solve this: I have a entire website in PHP (5.2) in a PHP "shared server", only i can use apache+PHP, CGI & NodeJS, no memcached, redis or another software. And i need to comunicate the PHP and the NodeJS Script. My first approach is using socket connection, creating in NodeJS a socket listener and connect to it witch PHP, and then, send commands, whait for response, and close connection (and end PHP Script). To the other side, i can call PHP script via ¿httprequest? ¿or using sockets again? The problem of using sockets fron Node to PHP, i CANT leave PHP script runing with set_time_limit(0) because the fuc... server, need to "call" PHP for another way. The NodeJS and Apache + PHP are in the same machine, i need to make the code for the fast response time (sockets better than web-calls). Better ideas or other solutions? thanks!

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• How does a web browser save passwords?

  - by marcus

  How do current web browsers (or mobile mail clients and any software in general) save user passwords? All answers about storing passwords say we should store only hashes, not the password themselves. But I'm having a hard time searching the web trying to find the best techniques to store passwords when we know we will need them in plain text later on — without storing them in plain text, without using a weak encryption (known key) and without asking the user for a master password. Any ideas?

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• In the future, when mobile devices are embedded in your body, what kind of APIs might be availbe to an application developer?

  - by Conor

  Mobile devices have APIs that allow an application to send and receive SMS, make a phone call, determine location etc. In the future, when mobile devices are embedded in your body, what kind of APIs might be availbe to an application developer? EDIT: This is not intended to be a joke question (but what's the harm in some funny answers?). It's to spur a discussion on how one aspect of mobile device application could pan out and what kind of application might be available. For example: health monitoring - various APIs available to get body temperature, sugar levels, etc for transmission to your GP.

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• Are nullable types preferable to magic numbers?

  - by Matt H

  I have been having a little bit of a debate with a coworker lately. We are specifically using C#, but this could apply to any language with nullable types. Say for example you have a value that represents a maximum. However, this maximum value is optional. I argue that a nullable number would be preferable. My coworker favors the use of zero, citing precedent. Granted, things like network sockets have often used zero to represent an unlimited timeout. If I were to write code dealing with sockets today, I would personally use a nullable value, since I feel it would better represent the fact that there is NO timeout. Which representation is better? Both require a condition checking for the value meaning "none", but I believe that a nullable type conveys the intent a little bit better.

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• Principles of an extensible data proxy

  - by Wesley

  There is a growing industry now with more than 30 companies playing in the Backend-As-A-Service (BaaS) market. The principle is simple: give companies a secure way of exposing data housed on premises and behind the firewall publicly. This can include database data, as well as Legacy PC data through established connectors; SAP for example provides a connector for transacting with their legacy systems. Early attempts were fixed providers for specific systems like SAP, IBM or Oracle, but the new breed is extensible, allowing Channel Partners and Consultants to build robust integration applications that can consume whatever data sources the client wants to expose. I just happen to be close to finishing a Cloud Based HTML5 application platform that provides robust integration services, and I would like to break ground on an extensible data proxy to complete the system. From what I can gather, I need to provide either an installable web service of some kind, or a Cloud service which the client can configure with VPN for interactions. Then I can build in connectors, which can be activated with a service account, and expose those transactions via web services of some kind (JSON, SOAP, etc). I can also provide a framework that allows people to build in their own connectors, and use some kind of schema to hook those connectors into the proxy. The end result is some kind of public facing web service that could securely be consumed by applications to show data through HTML5 on any device. My gut is, this isn't as hard as it sounds. Almost all of the 30+ companies (With more popping up almost weekly) have all come into existence in the last 18 months or so, which tells me either the root technology, or the skillset to create the technology is in abundance right now. Where should I start on this? Are there some open source projects I can leverage? A specific group of developers I can hire? I'm confident someone here can set me on the right path and save me some time. You don't see this many companies spring up this rapidly if they are all starting from scratch with proprietary technology. The Register: WTF is BaaS One Minute Video from Kony on their BaaS

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• When to start thinking about scalability?

  - by Rits

  I'm having a funny but also terrible problem. I'm about to launch a new (iPhone) app. It's a turn-based multiplayer game running on my own custom backend. But I'm afraid to launch. For some reason, I think it might become something big and that its popularity will kill my poor lonely single server + MySQL database. On one hand I'm thinking that if it's growing, I'd better be prepared and have a scalable infrastructure already in place. On the other hand I just feel like getting it out into the world and see what happens. I often read stuff like "premature optimization is the root of all evil" or people saying that you should just build your killer game now, with the tools at hand, and worry about other stuff like scalability later. I'd love to hear some opinions on this from experts or people with experience with this. Thanks!

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• Objective-C Lesson in Class Design

  - by Pota Onasys

  I have the following classes: Teacher Student Class (like a school class) They all extend from KObject that has the following code: - initWithKey - send - processKey Teacher, Student Class all use the functions processKey and initWithKey from KObject parent class. They implement their own version of send. The problem I have is that KObject should not be instantiated ever. It is more like an abstract class, but there is no abstract class concept in objective-c. It is only useful for allowing subclasses to have access to one property and two functions. What can I do so that KObject cannot be instantiated but still allow subclasses to have access to the functions and properties of KObject?

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• DDD and filtering

  - by tikhop

  I am developing an app in ddd maner. So I have a complex domain model. Suppose I have a Fare object and Airline. Each Airline should contain several or much more Fares. My UI should represent Model (only small part of complex model) as a list of Airline, when the user select the Airline, I must show the list of Fares. User can filtering the Fares (by travel time, cost, etc.). What is the appropriate place for filtering Fares and Airlines? I am assuming that I should do it in ViewModel. Like: My domain model has wrapped with Service Layer - UI works with ViewModel - ViewModel obtain data from Service Layer filtering it and create DTO objects for UI. Or I'm wrong?

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• Quality of Code in unit tests?

  - by m3th0dman

  Is it worth to spend time when writing unit tests in order that the code written there has good quality and is very easy to read? When writing this kinds of tests I break very often the Law of Demeter, for faster writing and not using so many variables. Technically, unit tests are not reused directly - are strictly bound to the code so I do not see any reason for spending much time on them; they only need to be functionaly.

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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 should I pronounce the :: and -> in PHP?

  - by Renesis

  When I read these lines aloud to someone: $controller->process(); UserManager::getInstance(); How should the -> and :: be pronounced? Reading the characters themselves in cumbersome and I don't know of any nicknames for them. Being a developer who is used to C-style syntax, I'd like to say "dot", but I'd like something that is easy to say and people can easily understand. It would also be good to know if there are any pronunciations that have become de-facto standards among teams of developers.

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• excel vba to CRUD drupal nodes

  - by Kirk Hings

  We need to periodically migrate Excel reports data into Drupal nodes. We looked at replicating some Excel functionality in Drupal with slickgrid, but it wasn't up to snuff. The Excel reports people don't want to double-enter their data, but their data is important to be in this Drupal site. They have hundreds of Excel reports, and update a row in each weekly. We want a button at the row end to fire a VBA macro that submits the data to Drupal, where a new node is created from the info submitted. (Yes, we are experienced with both Drupal and VBA; all users and the site are behind our firewall.) We need the new node's nid or URL returned so we can then create a link in Excel directly to that node Site is D6, using Services 3.x module. I tried the REST server module, but we can't get it to retrieve data without session authentication on, which we can't do from Excel. (unless you can?) I also noticed the 'data' it was returning via browser url was 14 or 20 nodes' info, not the one nid requested (Example: http://mysite.com/services/rest/report/node/30161) When I attempt to create a simple node like this from VBA: Dim MyURL as String MyURL = "http://mysite.com/services/rest/report/node?node[type]=test&node[title]=testing123&node[field_test_one][0][value]=123" Set objHTTP = CreateObject("MSXML2.ServerXMLHTTP") With objHTTP .Open "POST", MyURL, False .setRequestHeader "Content-Type", "application/x-www-form-urlencoded" .send (MyURL) End With I get HTTP Status: Unauthorized: Access denied for user 0 "anonymous" and HTTP Response: null Everything I search for has examples in php or java, nothing in VBA. Also tried switching to using an XMLRPC server but that's even more confusing. We would like json (used application/json, set formatter accordingly in REST server settings), but will use anything that works. Ideas? Thanks in advance!

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• How to price code reviews to encourage good behavior?

  - by Chris Clark

  I work for a company that has a hosted .net internet application with many clients. Those clients often want to write customizations for our application. We have APIs to hook into the app, but the customizations themselves are written in .net. This is a shared, secure hosting environment and we have to code review these customizations before we can deploy them in our datacenter to ensure that they don't degrade performance, crash our servers, or open any security vulnerabilities. We charge for these code reviews. The current pricing model is simply a function of the number of lines of code. I think this is a bad idea for a variety of reasons, but primarily because, if we are interested in verifying that the code works as expected, we should be incentivizing good, readable code, not compaction. I would like to propose a pricing model that incorporates some, or all of the following as inputs: Lines of code Cyclomatic complexity Avg function length # of functions Are there any other metrics I should incorporate, or other ideas for how we can reasonably create pricing for code reviews that encourages safe and understandable code?

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• Increase the size of a memory mapped file

  - by sandun dhammika

  I am maintaning a memory mapped file to store my tree like datastructure. When I'm updating the datastructure ,I got this problem. The file is limited on it's size and can't be too long or too small. I have a methods like void mapfile_insert_record(RECORD* /* record*/); void mapfile_modify_record(RECORD* /* record*/); Both operations could lead to exceed the space which is free on memory file. How do I overcome this? What strategy I should use. calculate whether it requires to exceed the file as a pre-condition on both methods. Dynamically exceed it , for a example manage a timer and constantly polling file for it's free avaliable size and then automatically extend it. Any ideas or patterns to overcome this problem?

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• What does "general purpose system" mean for Java SE Embedded?

  - by Majid Azimi

  The Oracle website says this about Java SE Embedded license: development is free, but royalties are required upon deployment on anything other than general purpose systems What does "general purpose system" mean here? We have a sensor network around the country. On each box we have installed, there is a micro controller based board that gets data from the environment and send data on serial port to a ARM based embedded board. On this board system there is a Java process which reads and submits data to our central server using JMS. Is this categorized as general purpose system? Sorry I'm asking this here. We are in Iran, there is no Oracle office here to ask.

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• Are there any formalized/mathematical theories of software testing?

  - by Erik Allik

  Googling "software testing theory" only seems to give theories in the soft sense of the word; I have not been able to find anything that would classify as a theory in the mathematical, information theoretical or some other scientific field's sense. What I'm looking for is something that formalizes what testing is, the notions used, what a test case is, the feasibility of testing something, the practicality of testing something, the extent to which something should be tested, formal definition/explanation of code coverage, etc. UPDATE: Also, I'm not sure, intuitively, about the connection between formal verification and what I asked, but there's clearly some sort of connection.

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• Mentioning a price for a service behind a free app in App Store

  - by David

  We are making a business service and have created an app to be used as a front-end. The app is free, but the service is not. Due to Apple taking 30% of in-app purchases, our service cannot be bought as an in-app purchase. My question is: Could Apple choose to throw out our app if we mention the price of the service in the description of our app in iTunes or in a help-text in the app? It seems unreasonable that this would cause problems, but the potential consequences to our business could be terrible so I want to make sure.

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• Object behaviour or separate class?

  - by Andrew Stephens

  When it comes to OO database access you see two common approaches - the first is to provide a class (say "Customer") with methods such as Retrieve(), Update(), Delete(), etc. The other is to keep the Customer class fairly lightweight (essentially just properties) and perform the database access elsewhere, e.g. using a repository. This choice of approaches doesn't just apply to database access, it can crop up in many different OOD scenarios. So I was wondering if one way is preferable over the other (although I suspect the answer will be "it depends")! Another dev on our team argues that to be truly OO the class should be "self-contained", i.e. providing all the methods necessary to manipulate and interact with that object. I personally prefer the repository approach - I don't like bloating the Customer class with all that functionality, and I feel it results in cleaner code having it elsewhere, but I can't help thinking I'm seriously violating core OO concepts! And what about memory implications? If I retrieve thousands of Customer objects I'm assuming those with the data access methods will take up a lot more memory than the property-only objects?

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• How can I convince my boss to invest into the developer environment?

  - by user95291

  Our boss said that developers should have fewer mistakes so the company would have money for displays, servers etc. An always mentioned example is a late firing of an underperforming colleague whose salary would have covered some of these expenses. On the other hand it happened a few times that it took a few days to free up some disk space on our servers since we can't get any more disk. The cost of mandays was definitely higher than the cost of a new HDD. Another example is that we use 14-15" notebooks for development and most of the developers get external displays after they spent one year at the company. The price of a 22-24" display is just a small fraction of a developers annual salary. Devs say that they like the company because of other reasons (high quality code, interesting projects etc.) but this kind of issues not just simply time-consuming but also demotivate them. In the point of view of the developers it seems that the boss always can find an issue in the past which they could have been done better so it's pointless to work better to get for a second display/HDD/whatever. How can I convince my boss to invest more into development environment? Is it possible to break this endless loop?

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