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• Where, in an object oriented system should you, if at all, choose (C-style) structs over classes?

  - by Anto

  C and most likely many other languages provide a struct keyword for creating structures (or something in a similar fashion). These are (at least in C), from a simplified point of view like classes, but without polymorphism, inheritance, methods, and so on. Think of an object-oriented (or multi paradigm) language with C-style structs. Where would you choose them over classes? Now, I don't believe they are to be used with OOP as classes seem to replace their purposes, but I wonder if there are situations where they could be preferred over classes in otherwise object-oriented programs and in what kind of situations. Are there such situations?

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• Dynamic Strategy Pattern [migrated]

  - by Karl Barker

  So I'm writing a web service architecture which includes FunctionProvider classes which do the actual processing of requests, and a main Endpoint class which receives and delegates requests to the proper FunctionProvider. I don't know exactly the FunctionProviders available at runtime, so I need to be able to 'register' (if that's the right word) them with my main Endpoint class, and query them to see if they match an incoming request. public class MyFunc implements FunctionProvider{ static { MyEndpoint.register(MyFunc); } public Boolean matchesRequest(Request req){...} public void processRequest(Request req){...} } public class MyEndpoint{ private static ArrayList<FunctionProvider> functions = new ArrayList<FunctionProvider>(); public void register(Class clz){ functions.add(clz); } public void doPost(Request request){ //find the FunctionProvider in functions //matching the request } } I've really not done much reflective Java like this (and the above is likely wrong, but hopefully demonstrates my intentions). What's the nicest way to implement this without getting hacky?

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• Classless tables possible with Datamapper?

  - by barerd

  I have an Item class with the following attributes: itemId,name,weight,volume,price,required_skills,required_items. Since the last two attributes are going to be multivalued, I removed them and create new schemes like: itemID,required_skill (itemID is foreign key, itemID and required_skill is primary key.) Now, I'm confused how to create/use this new table. Here are the options that came to my mind: 1) The relationship between Items and Required_skills is one-to-many, so I may create a RequiredSkill class, which belongs_to Item, which in turn has n RequiredSkills. Then I can do Item.get(1).requiredskills. This sounds most logical to me. 2) Since required_skills may well be thought of as constants (since they resemble rules), I may put them into a hash or gdbm database or another sql table and query from there, which I don't prefer. My question is: is there sth like a modelless table in datamapper, where datamapper is responsible from the creation and integrity of the table and allows me to query it in datamapper way, but does not require a class, like I may do it in sql?

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• Should I use my real name in my open source project?

  - by Jardo

  I developed a few freeware programs in the past which I had signed with my pseudonym Jardo. I'm now planning to release my first open source project and was thinking of using my full real name in the project files (as the "author"). I thought it would be good to use my name as my "trademark" so if someone (perhaps a future headhunter) googles my name, they'll find my projects. But on the other side, I feel a bit paranoid about disclosing my name (in the least case I could be getting a lot of spam to my email, its not that hard to guess your private email from your name). What do you think can be "dangerous" on disclosing your full name? What are the pros and cons? Do you use your real name or a pseudonym in your projects? I read this question: What are the advantages and disadvantages to using your real name online? but that doesn't apply to me bacause it's about using your real name online (internet discussions, profiles, etc.) where I personally see no reason to use my real name... And there is also this question: Copyrighting software, templates, etc. under real name or screen name? which deals with creating a business or a brand which also doesn't apply to me because I will never sell/give away my open source project and if someone else joins in, they can write their name as co-author without any problems...

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• Where can I find a Script for a crowdfunding website? [closed]

  - by Lincedit

  Possible Duplicate: crowd funding platform? I am looking for a project for a script (PHP/MySql) that provides me the functionality of a crowdfunding website. There are many scripts which should be usable, but I need maybe some scripts for Joomla CMS or any other kind of opensource CMS Websites. I checked all the Resources on Google and could not find some kind of this scripts, because there are no German language installed or prepared for multilingual websites. It is non profit project and I am just looking for any kind of advices, which can be helpfull to me. I hope you can help me here. Please send me some information about some scripts which are running? Many Thanks

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• Separating Db from business with Inherited classes using multiple views

  - by catalinux

  I have a software that has a car model that will be used in different views (listing, ads, detail page, carousel, up sell widget,etc). class CarModel extends DbModel{ } I look for a "nice way" (a combination of flexible, easy to maintain,etc) to have this used in views. I'm thinking at two different ways Having object views for each context CarViewBase{ var car;// of type CarModel function constructor(args){ //will instantienta internal variable car based on args } function getThumb(){ } function getTitle(){ } } CarListingView extends CarViewBase{ function getListing(){ } } CarAdsView extends CarViewBase{ //the busines rule changes for ads widget function getThumb(){ } } Extending directly the CarModel The challenges comes when My Car Model might need an abstract factory. Let's say I have a field on my car object that states the type of the car : a truck, or a bike, or van. How would affect that my object view? Let's say that getTitle() rule would be different for each type of it. How would you do it?

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• What is the preferred pattern when attaching a 'runtime object'?

  - by sebf

  In my application I have the following: public class NeatObject { /* lots of static data, and configuration flags */ } public class NeatObjectConsumer { void DoCleverStuffWithObjectOnGPU(NeatObject obj); } Where NeatObject and its consumer are used to control the GPU. The idea being that, the configuration of an instance of NeatObject and its members, define how the consumer instance behaves. The object can be passed around, edited, and most importantly serialised/deserialised by the application, with and without knowledge of NeatObjectConsumer, then provided back to the consumer to do something else. The purpose of this seperation is: The consumer manages hardware resources, which change depending on the computer, and even on the execution of the application, making preserving the state of an object which does everything difficult. Avoids circular references if the assembly that contains the consumer needs to reference one that only needs to know about NeatObject. However, there is a complication in that the consumer creates hardware resources and needs to associate them with NeatObject. These don't need to be preserved, but still need to be retrieved. DoCleverStuffWithObjectOnGPU() will be called many, many times during execution and so any bottleneck is a concern, therefore I would like to avoid dictionary lookups. What is the preferred method of attaching this information to NeatObject? By preferred, I mean intuitive - other coders can see immediately what is going on - and robust - method doesn't invite playing with the resources or present them in such a way as to make them easily corruptible. Essentially, I want to add my own metadata - how should I do it? Try to use 'actual metadata' functionality like Reflection? A member of the type of an abstract class? Unmanaged pointers? If you took on a project that used this pattern, what would you have liked the previous developer to do?

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• Is there a colloquial term for the web dev equivalent of "Script Kiddies"? [on hold]

  - by Darkcat Studios

  I recently came across a couple of lets say "young people" who were convinced that they were "Web Developers", despite the fact that they were only able to configure a wordpress template, and not even able to edit images properly. So this got me thinking, "back in the day" kids who thought they were hackers but just ran other peoples scripts they had found, were known as Script Kiddies. Do we have a term for these yet?

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• Creating a Predicate Builder extension method

  - by Rippo

  I have a Kendo UI Grid that I am currently allowing filtering on multiple columns. I am wondering if there is a an alternative approach removing the outer switch statement? Basically I want to able to create an extension method so I can filter on a IQueryable<T> and I want to drop the outer case statement so I don't have to switch column names. private static IQueryable<Contact> FilterContactList(FilterDescriptor filter, IQueryable<Contact> contactList) { switch (filter.Member) { case "Name": switch (filter.Operator) { case FilterOperator.StartsWith: contactList = contactList.Where(w => w.Firstname.StartsWith(filter.Value.ToString()) || w.Lastname.StartsWith(filter.Value.ToString()) || (w.Firstname + " " + w.Lastname).StartsWith(filter.Value.ToString())); break; case FilterOperator.Contains: contactList = contactList.Where(w => w.Firstname.Contains(filter.Value.ToString()) || w.Lastname.Contains(filter.Value.ToString()) || (w.Firstname + " " + w.Lastname).Contains( filter.Value.ToString())); break; case FilterOperator.IsEqualTo: contactList = contactList.Where(w => w.Firstname == filter.Value.ToString() || w.Lastname == filter.Value.ToString() || (w.Firstname + " " + w.Lastname) == filter.Value.ToString()); break; } break; case "Company": switch (filter.Operator) { case FilterOperator.StartsWith: contactList = contactList.Where(w => w.Company.StartsWith(filter.Value.ToString())); break; case FilterOperator.Contains: contactList = contactList.Where(w => w.Company.Contains(filter.Value.ToString())); break; case FilterOperator.IsEqualTo: contactList = contactList.Where(w => w.Company == filter.Value.ToString()); break; } break; } return contactList; } Some additional information, I am using NHibernate Linq. Also another problem is that the "Name" column on my grid is actually "Firstname" + " " + "LastName" on my contact entity. We can also assume that all filterable columns will be strings.

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• Complex, yet simple crafting system model

  - by KatShot

  I'm working on some arcade shooter/slasher, and the main logline is "Kick'em with everything you want". There's not so many enemies in GDD, main focus is on tons of weapons and gadgets to cause mayhem. To get weapon, you need to craft it, and now crafting system looks simple, like: 1) You got three slots for weapon parts (like A, B, C) 2) You collect misc weapon parts, and when you got atleast one for every slot, you can craft a weapon (for example, if you got A1, B1, B2, B3 and C1, you can craft such models - A1B1C1, A1B2C1, A1B3C1) As for me, this crafting system is too simple, because weapon parts will just fall from the top of screen, often enough. That's why I'm thinking about adding some more crafting system levels, like resources (collect 10 scrap pieces to make part A1 or C3), etc. My question is: How can i add some more complex, still simple, transparent levels in crafting system? upd. For example, in Minecraft or Terraria, first 5-10 crafting recipies quite transparent and simple IMHO. But then it turns into huge mess to understand, how to craft this or that (for example, fishing rod)

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• Customer Reviews on Company Listings [closed]

  - by GSTAR

  I'm not sure if this is the right place but I am after some general advice on a feature I am looking to implement on my website. The website I have is a Wedding Directory. Here, companies can advertise in the form of a directory listing. This listing contains the company details - such as what they do and how you can contact them. There are three packages available - Basic package is free and Silver and Gold packages are charged for. Now in order to further enhance the directory, I want to enable customer reviews for each listing. This is basically whereby customers who have used a particular company's service can write a review (and rate out of 5) of their experience. The dilemma I face is that if customers are to be paying for their listings then surely they will expect to not have content on their listing that would tarnish their reputation (i.e. negative reviews). But at the same time I want to be impartial and help my site visitors to make informed choices on which companies to book when arranging their weddings. Of course I will exercise my ability to remove offensive or fake reviews but I do not want to be removing reviews just to satisfy my clients. Suppose a client pays me a premium fee to have their listing on my front page and at the top of the listings. Now suppose that client gets lost of negative reviews - the fact that they have increased visibility means that they will also get increased bad publicity. This in turn means they won't renew their package and will most likely request the listing to be taken down. So, how can I get the right balance here and keep everyone happy?

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• When creating a GUI wizard, should all pages/tabs be of the same size? [closed]

  - by Job

  I understand that some libraries would force me to, but my question is general. If I have a set of buttons at the bottom: Back, Next, Cancel?, (other?), then should their location ever change? If the answer is no, then what do I do about pages with little content? Do I stretch things? Place them in the lone upper left corner? According to Steve Krug, it does not make sense to add anything to GUI that does not need to be there. I understand that there are different approaches to wizards - some have tabs, others do not. Some tabs are lined horizontally at the top; others - vertically on the left. Some do not show pages/tabs, and are simply sequences of dialogs. This is probably a must when the wizard is "non-linear", e.g. some earlier choices can result in branching. Either way the problem is the same - sacrifice on the consistency of the "big picture" (outline of the page/tab + location of buttons), or the consistency of details (some tabs might be somewhat packed; others having very little content). A third choice, I suppose is putting extra effort in the content in order to make sure that organizing the content such that it is more or less evenly distributed from page to page. However, this can be difficult to do (say, when the very first tab contains only a choice of three things, and then branches off from there; there are probably other examples), and hard to maintain this balance if any of the content changes later. Can you recommend a good approach? A link to a relevant good blog post or a chapter of a book is also welcome. Let me know if you have questions.

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• Versioning Java APIs in a non-web context

  - by GAP

  I have modular java application which consists of 40 modules. Some of these modules needs to expose external APIs which other modules or any external integration should be using. The system runs as a desktop application and each module is bundled as a separate jar file. My plan is to bundle the external api as a separate jar. But now the question is: how can I maintain multiple versions of the same API to keep backward compatibility in cases where it can co-exist? Are there any de facto standards on handling APIs versioning out of a web context ?

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• Do open world games need less backstory?

  - by Raceimaztion

  I've played a few open-world games and really enjoyed them, though the ones I've really enjoyed have generally received complaints about how little story there is to them. The Saboteur is one example of this. Fully open-world, good enough story (for me, anyway), engaging gameplay, and still has received complaints in reviews about not having enough story. Do open-world games actually need a full, all-encompassing story? Or can fun and engaging gameplay fill in the gap and let the designer get away with a slightly less complete story?

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• "Do it right, against customer's wishes" - how is it called?

  - by SF.

  We know the optimal situation of negotiating corrections of specifications with the customer, getting the specs to do what the client wanted, not what they said or thought they wanted. That's negotiating, explaining. Sometimes, we're unable to convince the client. We're forced to produce broken as designed. This, called "demonology" by merit of mages summoning demons and demons fulfilling their wishes very literally, causing the mage's demise as result, is another approach that will leave the customer very dissatisfied once they realize their error, and of course try to pin the blame on the developer. Now I just faced a very different approach: the customer created simple specs that fail to account for some critical caveat, and is completely unwilling to fix them, admit the obvious errors and accept suggested corrections. The product made to these specs will be critically broken, and possibly might cost human lives. Still, it's too late to drop the contract entirely. The contract has punitive clauses for that, ones we can't really accept. The boss' decision? We do the work right and lie to the customer that we did it according to the specs. The algorithms in question are hidden deep enough under the surface, the product will do the work just fine, won't fail in the caveat situation, and unless someone digs too deep, they will never discover we didn't break it as requested. Is there some common name for this tactics of execution of specs?

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• Encapsulating code in F# (Part 1)

  - by MarkPearl

  I have been looking at F# for a while now and seem a few really interesting samples and snippets on howto’s. This has been great to see the basic outline of the language and the possibilities, however a nagging question in the back of my mind has been what does an F# project look like? How do I code group code in F# so that it can be modularized and brought in and out of a project easily? My Expert F# book has an entire chapter (7) dedicated to this and after browsing the other chapters of the book I decided that this topic was something I really wanted to know more about now! Because of my C# background I keep trying to think in F# of objects. So to try and get a clearer idea of how to do things the F# way I am first going to take a very simplified C# example and try to “translate” it. using System; namespace ConsoleApplication1 { namespace ExampleOfEncapsulationInCSharp { class Program { static void EncapsulatedVariableInAMethod() { int count = 10; Console.WriteLine(count); } static void Main(string[] args) { EncapsulatedVariableInAMethod(); Console.ReadLine(); } } } } From the above example the count integer is encapsulated within EncapsulatedVariableInAMethod method. You couldn’t access the count variable from outside the scope of its parent method but have full access to it within the method. Lets look at my F# equivalent… open System let EncapsulatedVariableInAMethod = let count = 10 Console.WriteLine(count) () EncapsulatedVariableInAMethod Console.ReadLine()   Now, when I first attempted to write the F# code I got stuck… I didn’t have the Console.WriteLine calls but had the following… open System let EncapsulatedVariableInAMethod = let count = 10 EncapsulatedVariableInAMethod Console.ReadLine()   The compiler didn’t like the let before the count = 10. This is because every F# expression must evaluate to a value. If I did not want to make the Console call, I would still need to evaluate the expression to something – and for this reason the Unit Type is provided. I could have done something like…. open System let EncapsulatedVariableInAMethod = let count = 10 () EncapsulatedVariableInAMethod Console.ReadLine()   Which the compiler would be happy with…

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• How can I implement a matchmaker?

  - by csiz

  I'm making a multiplayer game, where players are separated in to rooms that would ideally have about 20 players. So I need a few pointers on an algorithm to distribute the players in to these rooms. A few more constraints: When a players gets in to a room, he should stay there until he decides to exit (the room itself changes levels) There may be more room servers, every server should create more rooms until near full capacity There's a central server that manages all the room servers, and directs the players towards their room

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• What precaution should I take to hire online freelancer designers? [on hold]

  - by tomDev

  For quite some time my company is super busy with our apps, and a few days ago someone contacted me by email offering his services to help me as a graphic designer. He has a fair price, a flickr portfolio (with great stuff but not popular at all), same on Twitter. I was really considering in hiring him for some specific service, but the question is... what precaution should I take when hiring someone I have no idea who is? I can't even be sure I have his real name and his real country. How do I make a contract? How do I pay? How do I know he will not sue us after the graphics reach the App Store asking for more money? And of course, how do I know he will actually do the service and not steal from some stock service? Am I a bit paranoiac or is this a common deal with graphics designers? PS: if someone asks I can provide his flickr, but I think this is a general question and not specific for this designer.

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• How are the conceptual pairs Abstract/Concrete, Generic/Specific, and Complex/Simple related to one another in software architecture?

  - by tjb1982

  (= 2 (+ 1 1)) take the above. The requirement of the '=' predicate is that its arguments be comparable. Any two structures are comparable in this case, and so the contract/requirement is pretty generic. The '+' predicate requires that its arguments be numbers. That's more specific. (socket domain type protocol) the arguments here are much more specific (even though the arguments are still just numbers and the function itself returns a file descriptor, which is itself an int), but the arguments are more abstract, and the implementation is built up from other functions whose abstractions are less abstract, which are themselves built from less and less abstract abstractions. To the point where the requirements are something like move from one location to another, observe whether the switch at that location is on or off, turn the switch on or off, or leave it the same, etc. But are functions also less and less complex the less abstract they are? And is there a relationship between the number and range of arguments of a function and the complexity of its implementation, as you go from more abstract to less abstract, and vice versa? (= 2 (+ 1 1) 2r10) the '=' predicate is more generic than the '+' predicate, and thus could be more complex in its implementation. The '+' predicate's contract is less generic, and so could be less complex in its implementation. Is this even a little correct? What about the 'socket' function? Each of those arguments is a number of some kind. What they represent, though, is something more elaborate. It also returns a number (just like the others do), which is also a representation of something conceptually much more elaborate than a number. To boil it down, I'm asking if there is a relationship between the following dimensions, and why: Abstract/Concrete Complex/Simple Generic/Specific And more specifically, do different configurations of these dimensions have a specific, measurable impact on the number and range of the arguments (i.e., the contract) of a function?

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• Team seeks collaboration for 2D action adventure RPG

  - by AlchemicTempest

  not entirely sure if it's appropriate to post this here, but I'll try: We are looking for all kinds of game dev interested people for our 2D sci-fi action adventure rpg "Quantum Nucleus" This is voluntary collaboration. We are seeking programmers(Java), artists, designers, audio people and writers So basically all kinds of people. Please watch our video, for further information: Video Link Thanks ! :D http://www.Alchemic-Tempest.com

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• Chapters Two, Three, and Four

  - by drsql

  I am trying to blog all of the chapters of the book, but due to deadlines and a lot of shuffling about, I never got around it for these three chapters, two of which I have added since I wrote the original table of contents. All of these contain mostly material from previous editions of the book, updated a good amount, but nothing tremendously different if you had memorized the material from the previous edition. As such, the pre-writing blog ritual wasn’t as necessary (for me at least) as it is going...(read more)

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• Can a domain specific language be used to representing the Open SRD

  - by NeoModulus

  I am in the early stages of creating an open source C# library that would allow developers to drop in the open SRD (http://www.d20srd.org/) into an existing project. Abstracted it is a complex set of tightly coupled business rules. Having previously worked on an adaptive object model project for health care risk management I began with that pattern in mind. Due to the high coupling of rules it is becoming apparent that the project may require some kind of scripting. Have started researching DSL implementation I am now considering scraping the adaptive object model for a domain specific language. I have not work with domain specific languages so my question is it reasonable to assume a domain specific language can be used to representing the open SRD?

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• Full Text Search Strategy For My Website

  - by Hosea146

  I have a website that allows users to search for items in various categories. Each category is a separate area (page) of my website. For example, some categories might be cars, bikes, books etc. At the moment a user has to search for an item by going to the page (for example, cars) and searching for the car they want. I would like to allow the user to search for anything on my site, from my main home page. At the moment, each page (category) has its own set of tables, and I don't really want to turn Full Text Search on for each table (20+ of them) and search each table individually when a search is done. This is going to be slow and tedious. What I'm thinking of doing is creating a single table that will hold all searchable information for each category of item (when an item is saved in its respective table, I would copy all searchable information over to my 'Search' table). I would then turn Full Text Search on for that table, and search that table. Does this sound reasonable? Is there a better way? I've never used Full Text Search before, so this is new to me.

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• What is realism?

  - by eversor

  Beyond the obvious something that seams real, realism in games is a hard feature to hit. In some cases, things that are completely impossible in real life are seen as realistic by gamers. For instance, in some FPS you can survive being hit by a fair amount of bullets when in real life one is enough, Newton-defying car drifts, etc. So, in some cases, reductions of life-like actions or consequences implies a bigger sense of realism. The root of this pseudo-philosophical question lies in: I am going to create a engine for battles in an online (browser-based) strategic game. Browser-based means that the battle would not be seen. And i do not know how to approach this realism issue.

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• Is there ever a time when creating a level/world editor with your game is a bad idea?

  - by Borgel

  I have created a few smaller games on my own in the past. My approach has always been to create a completed editor where it has all the functionality needed to save a level file and load it into the game. This has always made most sense to me but I keep hearing from people that a game is never fully done in the editor. I have never worked in a game development team and so I don't have first hand experience, but not adding everything needed to make the game to the editor just seams wrong. Am I missing something? Is there ever a reason not to add a tool to the editor?

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