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• Scalability of multi-threading in game server

  - by Taylor Hill

  What is a reasonable number of threads for a simple 2D mmo in Java? Is it reasonable to have two threads per connection, one for the input stream and one for the output stream? The reason I ask is because I use a blocking method on the input stream, and a workaround seems unnecessarily complex if I were to try to get around it without adding threads. This is mostly for my own edification; I don't expect to have 5 million people playing it ever, or even 5, but I'm wondering what a good scalable solution is, and if this is reasonable for a small server (<30 connections).

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• Safest way (i.e. HTTPS, POST, PGP) to send decryption keys through the web?

  - by theGreenCabbage

  I am in the final stages of development for my Revit plugin. This plugin is programmed in C#, and distributed via a DLL. One of the DLLs is an encrypted SQLite database (with proprietary data) that is in the form of a DLL. Currently, in development stages, the decryption key for the SQLite database is hardcoded in my main DLL (the program's DLL). For distribution, since DLLs are easily decompilable, I am in need of a new method to decrypt the DLL. My solution is to send our decryption keys from our servers securely to the host's computer. I was looking in POST, thinking it was more secure than GET, but upon research, it appears it's similarly insecure, only more "obscure" than GET. I also looked into HTTPS, but Hostgator requires extra money for HTTPS use. I am in need of some advice - are there any custom solutions I can do to implement this?

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• Transparent PHP script execution using mod_rewrite

  - by tori3852

  I am looking for a solution for this a problem: I need that every HTTP request (method is irrelevant) in Apache http server would be served only after execution of specific PHP script. This is needed because I need to gather some information about requests, etc. As far as I understand - this could be achieved using mod_rewrite module. So far I have done this (in .htaccess file): RewriteEngine on RewriteRule ^(.*)$ script.php [C] script.php is executed, but I need that after this original request would be executed. Thanks - any help is appreciated.

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• Benefits of TOGAF or similar?

  - by Lunatik

  I can read the website blurb and be impressed by the alleged benefits, but I haven't worked anywhere or with anyone who followed the TOGAF (or any alternative) architecture framework. Our organisation has declared itself dedicated to moving from what is currently a fairly shambolic design & development model towards something approaching a modern structured process. Things like TOGAF have been mentioned as helping achieve a world-class enterprise development environment (!) but I'm convinced that no-one here really understands the real-world benefits that wholesale adoption might bring and, perhaps more importantly, the effort/pain required to achieve the same. Do you have experience in using TOGAF or similar to wrestle control in an organisation? Do you think that use of the framework brought any benefit? Edit: For clarification TOGAF is "The Open Group Architecture Framework", a detailed method and set of tools for developing an enterprise architecture. See: http://www.opengroup.org/architecture/togaf8-doc/arch/

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• Is there any complications or side effects for changing final field access/visibility modifier from private to protected?

  - by Software Engeneering Learner

  I have a private final field in one class and then I want to address that field in a subclass. I want to change field access/visibility modifier from private to protected, so I don't have to call getField() method from subclass and I can instead address that field directly (which is more clear and cohessive). Will there be any side effects or complications if I change private to protected for a final field? UPDATE: from logical point of view, it's obvious that descendant should be able to directly access all predecessor fields, right? But there are certain constraints that are imposed on private final fields by JVM, like 100% initialization guarantee after construction phase(useful for concurrency) and so on. So I would like to know, by changing from private to protected, won't that or any other constraints be compromised?

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• How do I swap two objects in a GC language without triggering GC?

  - by TenFour04

  I have two array lists. that I want to swap each frame. My question is, does the variable 'temp' need to be a member variable to avoid triggering GC, assuming this method is called on dozens of objects each frame? I'm not creating a new object, just a new reference to an object. public void LateUpdate(){ ArrayList<int> temp = previousFrameCollisions; previousFrameCollisions = currentFrameCollisions; currentFrameCollisions = temp; currentFrameCollisions.clear(); } I've been told there's no reason to make a primitive into a member variable just to avoid GC, so my best guess is that this also applies to object references.

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• sprite group doesn't support indexing

  - by user3956

  I have a sprite group created with pygame.sprite.Group() (and add sprites to it with the add method) How would I retrieve the nth sprite in this group? Code like this does not work: mygroup = pygame.sprite.Group(mysprite01) print mygroup[n].rect It returns the error: group object does not support indexing. For the moment I'm using the following function: def getSpriteByPosition(position,group): for index,spr in enumerate(group): if (index == position): return spr return False Although working, it just doesn't seem right... Is there a cleaner way to do this? EDIT: I mention a "position" and index but it's not important actually, returning any single sprite from the group is enough

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• how to serialize function depending on what instance of object calls it, if same instance call in a thread then do serialize else not

  - by LondonDreams

  I have a function which fetches and updates some record from db and I am trying to make sure each if the function is called by same instance of object(same Or different thread) then function should behave synchronized else its a call from different object instance function need not to be synchronized. I have tried it use a lock per client. That is, instead of synchronizing the method directly using explicit locking through lock objects using Map. function is like :- getAndUpdateMyHitCount(myObjId){ //go to db and get unique record by myObjId //fetch value , increment , save update } And this function may get call is same thread by different Or same object instance But as fetching and matching from Map is slow , Is there other optimized way to do this ? Found similar at this Question but dont feel that is optimized

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• How can I add a Google search box to my website? [migrated]

  - by wahle509

  I am trying to add a Google search box to my own website. I would like it to search Google itself, not my site. There was some code I had that use to work, but no longer does: <form method="get" action="https://www.google.com/search"> <input type="text" name="g" size="31" value=""> </form> When I try making a search, it just directs to the Google homepage. Well, actually it directs here: https://www.google.com/webhp Does anyone have a different solution? What am I doing wrong?

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• When do you say "near ID" / "far ID" when using RTMFP in ActionScript 3?

  - by Panzercrisis

  I've been using RTMFP streaming for around a year in ActionScript 3, and I pretty much know the difference between a near ID and far ID. The near ID is your peer ID, and the far ID is the other guy's peer ID. The problem I'm having is that, to my knowledge, choosing whether to use one term or the other in a given sentence is a little like choosing whether to say "go" or "come". In English, "go" and "come" have opposite meanings, but ironically, they can still be used almost interchangeably. It's because whether you're going or coming is so heavily dependent on perspective, as opposed to anything concrete. Is the choice of words between "near ID" and "far ID" just as ambiguous, or is there some sort of method to the madness? Thanks!

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• Observer Pattern Implementation

  - by user17028

  To teach myself basic game programming, I am going to program a clone of Pong. I will use the Observer design pattern, with an interface between the input and the game engine. However, I'm not sure what the interface should do. One idea I had was for the input interface to tell the game engine that (e.g.) the screen was clicked, then to let the game engine decide what to do with that information (shoot a bullet, for example). Another idea I had was for the input interface, having caught the mouse click, to tell the game engine to shoot a bullet. Which method would be better for me to use?

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• Get and set accessors do they protect different instances of a variable?

  - by Chris Halcrow

  The standard method of implementing get and set accessors in C# and VB.NET is to use a public property to set and retrieve the value of a corresponding private variable. Am I right in saying that this has no effect of different instances of a variable? By this I mean, if there are different instantiations of an object, then those instances and their properties are completely independent right? So I think my understanding is correct that setting a private variable is just a construct to be able to implement the get and set pattern? Never been 100% sure about this.

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• Should single purpose utility app use a class

  - by jmoreno

  When writing a small utility app, that does just one thing, should that one thing be encapsulated in a seperate class, or just let it be part of whatever class/module is used to start the application? I.e. Main would consist of 2 or three lines calling the constructor and then the DoIt methods, nothing else. Or should Main be the DoIt method, with whatever functions it needs added to the main class? Asking because I want to get some alternative perspective, but couldn't find a similar question. If my google-fu is bad and there's a dup, please close.

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• Android game scrolling background

  - by Stevanicus

  Hi There, I'm just trying to figure out the best approach for running a scolling background on an android device. The method I have so far.... its pretty laggy. I use threads, which I believe is not the best bet for android platforms @Override public void run() { // Game Loop while(runningThread){ //Scroll background down bgY += 1; try { this.postInvalidate(); t.sleep(10); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } where postinvalidate in the onDraw function simply pushings the background image down canvas.drawBitmap(backgroundImage, bgX, bgY, null); Thanks in advance

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• Adding gesture recognizer (or dragging) to CCSprite

  - by user339946

  I'm trying to allow a CCSprite to be dragged across the screen. I've succeeded so far by doing it on a Layer level (from this tutorial). However, this only allows ONE sprite to be dragged at a time as the method implementation can only identify a single sprite to move at a time. I'd like to be able to perhaps add a gesture recognizer or somehow implement ccTouchesBegan/Moved in my own little CCSprite subclass. However, from what I understand, you can't just add gesture recognizers to CCSprites. ccTouchMoved are also not available on CCSprites?? Really confused as to how to implement touches on Cocos2D. What is the easiest way to add some position translation code to a CCSprite so it can be dragged around? Thanks!

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• How to Install Xampp on Windows XP

  To begin, visit the XAMPP for Windows home page, located at: http://www.apachefriends.org/en/xampp-windows.html. You will have several options for which flavor of XAMPP you wish to install, including the Installer, Zip, and 7zip versions. For simplicity's sake, this tutorial will use the simplest method: the installer. Click on the Installer link and you will be redirected to the program's SourceForge page. You may get a pop-up like the one below; if so, click Run: Next, you will be prompted to choose an installation language. Choose English (or whichever language you wish) and click the quo...

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• Why can't my jsp page read chinese chars from mysql? [migrated]

  - by Canking

  The mysql chars is utf-8, and the jsp page is also set to utf-8. I use the method: DriverManager.getConnection("jdbc:mysql://localhost:3306/jsptest?"+"useUnicode=true&characterEncoding=UTF-8","root",""); But it can not be use. When I insert Chinese chars into mysql and select it out, that would be proper functioning. The question is when I select some Chinese chars that I write into mysql at first, it would be all the "?" at the Chinese char place! Please watch the picture:

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• How do you usually manage callbacks in Java using Swing library?

  - by none

  I'm quite new to the Java Swing programming, and GUI development as well. As a beginner, I'm currently reading Design Pattern, but finding what I'm looking for is quite hard, most of the times. So far, I've never had huge problems defining a view hierarchy - I just use to subclass component from component. But the hard-to-do here is how managing callbacks, which often become hard to maintain due to the hard code. During my last projects, I tried to separate GUI, Listener and Callbacker objects which cooperated together, but in this way it was really hard adding new features. So, which kind of best patterns or best practices do you tend to use when trying to maintain, add new features or even worst avoid to hard-code classes which manage callbacks method in this kind of frameworks (mainly Java Swing)?

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• Tile transitions - external vs internal

  - by omgnoseat

  I've been looking at a couple of games and noticed that the transitions between tiles are handled somewhat different. I was wondering which methods are to be used in different situations and why. I'm currently using internal edges in a top-down game, and it's working out so far. But I don't want to run into problems later on, and have to redo the whole tileset. I noticed that platforming games mostly use the internal edges, and top-down games mostly use external and hybrid transitions. I can see how these tiles are used to create "depth" in top-down games, where the player apears to be standing in front of a wall for example. But it seems unlikely that such a small feature decides the entire method for tile transitions. You could always alter the bounding box to create the same effect.

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• implementing a high level function in a script to call a low level function in the game engine

  - by eat_a_lemon

  In my 2d game engine I have a function that does pathfinding, find_shortest_path. It executes for each time step in the game loop and calculates the next coordinate pair in the series of coordinates to reach the destination object. Now I want to call this function in a scripting language and have it only return the last coordinate pair result. I want the game engine to go about the business of rendering the incremental steps but I don't want the high level script to care about the rendering. The high level script is only for ai game logic. Now I know how to bind a method from C to python but how can I signal and coordinate the wait time between the incremental steps without the high level function returning until its time for the last step?

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• OpenGL: Drawing to a texture

  - by Danran

  Well im just a bit stuck wondering how to draw an item to a texture. Specifically, i'm using; glDrawArrays(GL_LINE_STRIP, indices[0], indices.size()); Because what i'm drawing via the above function updates every-frame, i'm just totally not sure how to go about drawing what i have to a texture. Any help is greatly appreciated! Edit: Well unfortunately my graphics card doesn't support FrameBuffer Objects :/. So i've been trying to get the copy contents from backbuffer method working. Here's what i currently have; http://pastebin.com/dJpPt6Pd And sadly all i get is a white square. Its probably something stupid that i'm doing wrong. Just unsure what it could be?

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• Java graphic objects as in flashgames

  - by Ryu Kajiya

  How is it possible (with the standard Java2D engine) to use small sprites like graphic objects? For those who don't know what I mean, in all those Flash-games like on Facebook they put small sprites on the screen which react to mouse-over and clicks. I tried to do the same in Java but can't find a good method. Swing components always spread over the whole bitmap, but I only want to get a reaction from the object when the mouse is over a pixel that's not transparent. So basically checking every time if the object below the mouse contains a non-transparent pixel (which i believe could be pretty intense in a gameloop or repaint loop). I have no idea how to implement such a thing efficiently.

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• Magento Subscription Form with Image upload

  - by Pankaj Upadhyay

  We have a peculiar requirement and our site is in magento. Requirement We want the user to fill in a personal information form with their image. After that, the user should be redirected to a product subscription page where he can select either 3 month, 6 month or on yearly basis. Now, when the selection is made, the user should make the payment via our payment method. How can I develop this? I am not able to figure it out. Should I go about editing the registration page or what? Let me know how you will deal with such a requirement?

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• Placing advice on any parameter of a given type in AspectJ

  - by user12558

  Hi, Im doing a POC using Aspectj. class BaseInfo{..} class UserInfo extends BaseInfo{..} class UserService { public void getUser(UserInfo userInfo){..} public void deleteUser(String userId){..} } I've defined an advice, that gets invoked when I pass an UserInfo instance.But when i try to pass the BaseInfo, the advice is not getting invoked. Below block executes the afterMethod as expected for getUser. &ltaop:pointcut id="aopafterMethod" expression="execution(* UserService.*(..,UserInfo,..))" / &gtaop:after pointcut-ref="aopafterMethod" method="afterMethod" / But when i try to give BaseInfo instead of UserInfo, the aspect is not getting triggered. Am i missing something? Kindly help me on this issue.

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• How to remove a page from site without affecting google serp

  - by Savas Zorlu

  I have a travel website. Just for information purposes, I had put a weather page. Now I realize that this page is increasing my overall bounce rate; because people who are looking for the weather forecast are landing on that page and getting what they want and exiting. What is the safest method to get rid of that page? Would it hurt my google rank if I remove it completely? Or is there a better way to handle this situation? I realize that around 21 percent of my daily hits are on that page. I would have been happy if my aim was to provide weather data for the location; however, my site needs to focus on selling hotels. So I think I need to get rid of this weather page immediately. What do you think?

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