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  • Google App Engine: How to be notified when APIs change or become available?

    - by herpylderp
    I am thinking about writing a GAE app but am a little hesitant because the EULA gives Google full rights to change their APIs anytime they want, for any reason. Obviously, they'd be out of business quick if they just 'upped and refactored their entire APIs, so I have to imagine they have some kind of notification system, perhaps even an RSS feed, etc. to notify developers well in advance of looming changes, or new features coming out in future releases. However, for the life of me I can't seem to find any trace of the existence of such a notification system. Perhaps the Google forums is the only place to get such updates? I guess I'm asking any battle-worn GAE veterans for re-assurance that there are reliable ways of getting notifications about policy or API changes from Google such that I could react and make the necessary app changes without production breaking or impacting any clients. Thanks in advance!

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  • How should I define Pom.xml in each Module so that web module can communicate with the other two ejb modules?

    - by Kayser
    Maven, maven, maven. It must be very nice and it is nice by a small application. Now I want to build an ear project: with two EJB Modules, a web Module and ear module to build an ear file. Web Module is dependent on the other ejb modules.. How should I define Pom.xml in each Module so that web module can communicate with the other two ejb modules in ear and the ear module builds the right ear file? What I have done before: Module 1 -- Basic Module. All other modules are dependent to this Module. Basic functionality like login etc. <packaging>ejb</packaging> Module 1 -- Data Module. All Entites are here Type EJB <dependency> <groupId>com.myCompnay</groupId> <artifactId>Modul_Basic</artifactId> <version>0.0.1-SNAPSHOT</version> <type>ejb</type> </dependency Module 2 -- Business Module. Businnes Facades are here. Type EJB <dependency> <groupId>com.myCompnay</groupId> <artifactId>Modul_Basic</artifactId> <version>0.0.1-SNAPSHOT</version> <type>ejb</type> </dependency Web Module - Type is WAR <dependency> <groupId>com.myCompnay</groupId> <artifactId>Modul_Basic</artifactId> <version>0.0.1-SNAPSHOT</version> <type>ejb</type> </dependency EAR Module -- In this project I try to build the project. <packaging>ear</packaging> <dependencies> <dependency> <groupId>com.myCompnay</groupId> <artifactId>Modul_Basic</artifactId> <version>0.0.1-SNAPSHOT</version> <type>ejb</type> </dependency <dependency> <groupId>com.myCompnay</groupId> <artifactId>Modul_Business</artifactId> <version>0.0.1-SNAPSHOT</version> <type>ejb</type> </dependency <dependency> <groupId>com.myCompnay</groupId> <artifactId>Modul_WEB</artifactId> <version>0.0.1-SNAPSHOT</version> <type>war</type> </dependency </dependencies> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-ear-plugin</artifactId> </plugin> </plugins> </build>

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  • Hostmonster can't change domains around?

    - by loneboat
    (question imported from http://superuser.com/q/204439/53847 ) Horrible title, but I couldn't think of a succinct way to summarize it to fit. I have HostMonster for my web hosting. I have several domain names under the same account (using the same web space, IP address, etc...). Every HM account has one domain set up as the "main domain", and all other domains are "secondary". The only way I have ever encountered this being an issue is in trying to use HTTPS - since (from my limited understanding) HTTPS encrypts headers, you can't route HTTPS requests to different virtual hosts on a server - only unencrypted requests, since it must look in the request to know where to route it. When I registered for my account, I only had one domain name (A). I have since added domain names (B), (C), (D), etc... At one point I switched domain name (B) to be my "main" domain name - so I could use HTTPS with it. I have since sold domain name (B), and would like to make domain name (A) my "main" one again (as it was before), but HM support says, "no, once a domain name has been a 'main' domain name on an account once, we can't set it up to be a 'main' domain name again. You're welcome to use domains (C), or (D), though.". They tell me the only way to reuse domain (A) as a "main" domain would be to set up a new account and transfer over all my files. I'm confused here. If I have domains (D), (E), and (F), they say I'm welcome to make one of them my new main domain name, just never (A) again, since I've already "used" it once. Calls to support only reveal that they can't let me do it because doing so would somehow "break" my account. Can anyone think of any good reason why this should be so? The only thing I can think is that maybe they're using the domain names as keys in some database or something? But if that's the case, that's ridiculous - they need to reorganize their databases!

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  • Use decorator and factory together to extend objects?

    - by TheClue
    I'm new to OOP and design pattern. I've a simple app that handles the generation of Tables, Columns (that belong to Table), Rows (that belong to Column) and Values (that belong to Rows). Each of these object can have a collection of Property, which is in turn defined as an enum. They are all interfaces: I used factories to get concrete instances of these products, depending on circumnstances. Now I'm facing the problem of extending these classes. Let's say I need another product called "SpecialTable" which in turn has some special properties or new methods like 'getSomethingSpecial' or an extended set of Property. The only way is to extend/specialize all my elements (ie. build a SpecialTableFactory, a SpecialTable interface and a SpecialTableImpl concrete)? What to do if, let's say, I plan to use standard methods like addRow(Column column, String name) that doesn't need to be specialized? I don't like the idea to inherit factories and interfaces, but since SpecialTable has more methods than Table i guess it cannot share the same factory. Am I wrong? Another question: if I need to define product properties at run time (a Table that is upgraded to SpecialTable at runtime), i guess i should use a decorator. Is it possible (and how) to combine both factory and decorator design? Is it better to use a State or Strategy pattern, instead?

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  • how to design transparent screen in libgdx

    - by ved
    this question is for LibGdx geeks. I want to make transparent screen in my game. For example, when level completes I want a new transparent screen pop up and show player's high score, buttons to navigate on next level etc like in angry birds kind of screen. This type of screen can also use, when user click on pause button, to show pause screen. Please guide me to design this kind of screen. Or if I am going wrong to make transparent screens for this kind of situation. Please guide me for better one.

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  • Need to find a find a fast/multi-user database program

    - by user65961
    Our company is currently utilizing Excel and have been encountering a series of issues for starters we have multiple users sharing this application. We utilize it write our schedules for our employees and generate staffing levels. May someone give me please or inform me what are the pros and cons of this program and offer suggestions for another database that allows multiple users to share and also give the pros and cons need something that will hold massive data and allow sharing, protecting capabilities.

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  • Updating "Inactive" Chunks

    - by Conner Bryan
    In my game, the only chunks (4x4 areas of tiles) in memory are the ones that the player is in. However, chunks need to have updates applied to them over time. A (likely) well-known example would be MineCraft: even if the player isn't in a chunk, the wheat still needs to grow over time. My current solution is to call a method and pass in the time since the chunk was active.. but what if the chunk depends on nearby chunks for information, i.e. vines spreading or similar? Is there any reasonable solutions to this problem, or should I simply not depend on nearby chunks?

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  • How to add reflection definition to read json files on web game

    - by user3728735
    I have a game which I deployed for desktop and android, I can read json data and create my levels, but the problem is, when it comes to reading json files from web app, I get an error that logs, cannot read the json file, I researched a lot and I found out that I should add my json config class to configurations, I added this line to gameName.gwt.xml, which is in core folder <extend-configuration-property name="gdx.reflect.include" value="com.las.get.level.LevelConfig"/> but it did not work out too, I have no idea where should I place this line, or where should I change to make my web app work, so I can read json files

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  • Adding a short delay between bullets

    - by Sun
    I'm having some trouble simulating bullets in my 2D shooter. I want similar mechanics to Megaman, where the user can hold down the shoot button and a continues stream of bullets are fired but with a slight delay. Currently, when the user fires a bullet in my game a get an almost laser like effect. Below is a screen shot of some bullets being fired while running and jumping. In my update method I have the following: if(gc.getInput().isKeyDown(Input.KEY_SPACE) ){ bullets.add(new Bullet(player.getPos().getX() + 30,player.getPos().getY() + 17)); } Then I simply iterate through the array list increasing its x value on each update. Moreover, pressing the shoot button (Space bar) creates multiple bullets instead of just creating one even though I am adding only one new bullet to my array list. What would be the best way to solve this problem?

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  • Fixing a collision detection bug in Slick2D

    - by Jesse Prescott
    My game has a bug with collision detection. If you go against the wall and tap forward/back sometimes the game thinks the speed you travelled at is 0 and the game doesn't know how to get you out of the wall. My collision detection works by getting the speed you hit the wall at and if it is positive it moves you back, if it is negative it moves you forward. It might help if you download it: https://rapidshare.com/files/1550046269/game.zip Sorry if I explained badly, it's hard to explain. float maxSpeed = 0.3f; float minSpeed = -0.2f; float acceleration = 0.002f; float deacceleration = 0.001f; float slowdownSpeed = 0.002f; float rotateSpeed = 0.08f; static float currentSpeed = 0; boolean up = false; boolean down = false; boolean noKey = false; static float rotate = 0; //Image effect system static String locationCarNormal; static String locationCarFront; static String locationCarBack; static String locationCarBoth; static boolean carFront = false; static boolean carBack = false; static String imageRef; boolean collision = false; public ComponentPlayerMovement(String id, String ScarNormal, String ScarFront, String ScarBack, String ScarBoth) { this.id = id; playerBody = new Rectangle(900/2-16, 700/2-16, 32, 32); locationCarNormal = ScarNormal; locationCarFront = ScarFront; locationCarBack = ScarBack; locationCarBoth = ScarBoth; imageRef = locationCarNormal; } @Override public void update(GameContainer gc, StateBasedGame sbg, int delta) throws SlickException { Input input = gc.getInput(); playerBody.transform(Transform.createRotateTransform(2)); float hip = currentSpeed * delta; float unstuckspeed = 0.05f * delta; if(carBack && !carFront) { imageRef = locationCarBack; ComponentImageRender.updateImage(); } else if(carFront && !carBack) { imageRef = locationCarFront; ComponentImageRender.updateImage(); } else if(carFront && carBack) { imageRef = locationCarBoth; ComponentImageRender.updateImage(); } if(input.isKeyDown(Input.KEY_RIGHT)) { rotate += rotateSpeed * delta; owner.setRotation(rotate); } if(input.isKeyDown(Input.KEY_LEFT)) { rotate -= rotateSpeed * delta; owner.setRotation(rotate); } if(input.isKeyDown(Input.KEY_UP)) { if(!collision) { up = true; noKey = false; if(currentSpeed < maxSpeed) { currentSpeed += acceleration; } MapCoordStorage.mapX += hip * Math.sin(Math.toRadians(rotate)); MapCoordStorage.mapY -= hip * Math.cos(Math.toRadians(rotate)); } else { currentSpeed = 1; } } else if(input.isKeyDown(Input.KEY_DOWN) && !collision) { down = true; noKey = false; if(currentSpeed > minSpeed) { currentSpeed -= slowdownSpeed; } MapCoordStorage.mapX += hip * Math.sin(Math.toRadians(rotate)); MapCoordStorage.mapY -= hip * Math.cos(Math.toRadians(rotate)); } else { noKey = true; if(currentSpeed > 0) { currentSpeed -= deacceleration; } else if(currentSpeed < 0) { currentSpeed += acceleration; } MapCoordStorage.mapX += hip * Math.sin(Math.toRadians(rotate)); MapCoordStorage.mapY -= hip * Math.cos(Math.toRadians(rotate)); } if(entityCollisionWith()) { collision = true; if(currentSpeed > 0 || up) { up = true; currentSpeed = 0; carFront = true; MapCoordStorage.mapX += unstuckspeed * Math.sin(Math.toRadians(rotate-180)); MapCoordStorage.mapY -= unstuckspeed * Math.cos(Math.toRadians(rotate-180)); } else if(currentSpeed < 0 || down) { down = true; currentSpeed = 0; carBack = true; MapCoordStorage.mapX += unstuckspeed * Math.sin(Math.toRadians(rotate)); MapCoordStorage.mapY -= unstuckspeed * Math.cos(Math.toRadians(rotate)); } else { currentSpeed = 0; } } else { collision = false; up = false; down = false; } if(currentSpeed >= -0.01f && currentSpeed <= 0.01f && noKey && !collision) { currentSpeed = 0; } } public static boolean entityCollisionWith() throws SlickException { for (int i = 0; i < BlockMap.entities.size(); i++) { Block entity1 = (Block) BlockMap.entities.get(i); if (playerBody.intersects(entity1.poly)) { return true; } } return false; } }

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  • How can I change this isometric engine to make it so that you could distinguish between blocks that are on different planes?

    - by l5p4ngl312
    I have been working on an isometric minecraft-esque game engine for a strategy game I plan on making. As you can see, it really needs some sort of shading. It is difficult to distinguish between separate elevations when the camera is facing away from the slope because everything is the same shade. So my question is: can I shade just a specific section of a sprite? All of those blocks are just sprites, so if I shaded the entire image, it would shade the whole block. I am using LWJGL. Are there any other approaches to take? Heres a link to a screenshot from the engine: http://i44.tinypic.com/qxqlix.jpg

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  • How can I perform sentiment analysis on extracted text from online sources?

    - by aniket69
    I'm working on extracting the sentiment from YouTube comments, blogs, news content, Facebook wall posts, and Twitter feeds. I'm looking for an automated way to do this: the two third-party solutions I've found have been AlchemyAPI and RapidMiner. Are these the best way to approach this project, or should I be using something else? Is there a more efficient way to approach sentiment analysis? What techniques have worked for you in a project like this?

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  • How to change the state of a singleton in runtime

    - by user34401
    Consider I am going to write a simple file based logger AppLogger to be used in my apps, ideally it should be a singleton so I can call it via public class AppLogger { public static String file = ".."; public void logToFile() { // Write to file } public static log(String s) { AppLogger.getInstance().logToFile(s); } } And to use it AppLogger::log("This is a log statement"); The problem is, what is the best time I should provide the value of file since it is a just a singleton? Or how to refactor the above code (or skip using singleton) so I can customize the log file path? (Assume I don't need to write to multiple at the same time) p.s. I know I can use library e.g. log4j, but consider it is just a design question, how to refactor the code above?

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  • Why wont the LibGDX's main class Initialize on Android Launcher?

    - by BluFire
    So I was searching for different ways that could suit me in programming and came across LibGDX. Naturally I looked at the tutorial. As I was doing it, I was following the steps word for word, except naming the classes. In the end, I was able to create the desktop launcher for the game but not the android launcher. The following error is my error: Cannot instantiate the type Game (Game is the name of the class) I got the tutorial from http://steigert.blogspot.com.au/2012/02/1-libgdx-tutorial-introduction.html The link in the tutorial is the original but it uses jogl instead of lwjgl.

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  • How do I put different textures on different walls? LWJGL

    - by lehermj
    So far I have it so you are running around in a box, but all of the walls are the same texture! I've loaded up other textures for the walls (I want the walls a different texture than the floor) but it seems as if its being ignored... Here's my code: int floorTexture = glGenTextures(); { InputStream in = null; try { in = new FileInputStream("floor.png"); PNGDecoder decoder = new PNGDecoder(in); ByteBuffer buffer = BufferUtils.createByteBuffer(4 * decoder.getWidth() * decoder.getHeight()); decoder.decode(buffer, decoder.getWidth() * 4, Format.RGBA); buffer.flip(); glBindTexture(GL_TEXTURE_2D, floorTexture); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, decoder.getWidth(), decoder.getHeight(), 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer); glBindTexture(GL_TEXTURE_2D, floorTexture); } catch (FileNotFoundException ex) { System.err.println("Failed to find the texture files."); ex.printStackTrace(); Display.destroy(); System.exit(1); } catch (IOException ex) { System.err.println("Failed to load the texture files."); ex.printStackTrace(); Display.destroy(); System.exit(1); } finally { if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } } int wallTexture = glGenTextures(); { InputStream in = null; try { in = new FileInputStream("walls.png"); PNGDecoder decoder = new PNGDecoder(in); ByteBuffer buffer = BufferUtils.createByteBuffer(4 * decoder.getWidth() * decoder.getHeight()); decoder.decode(buffer, decoder.getWidth() * 4, Format.RGBA); buffer.flip(); glBindTexture(GL_TEXTURE_2D, wallTexture); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, decoder.getWidth(), decoder.getHeight(), 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer); glBindTexture(GL_TEXTURE_2D, wallTexture); } catch (FileNotFoundException ex) { System.err.println("Failed to find the texture files."); ex.printStackTrace(); Display.destroy(); System.exit(1); } catch (IOException ex) { System.err.println("Failed to load the texture files."); ex.printStackTrace(); Display.destroy(); System.exit(1); } finally { if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } } int ceilingDisplayList = glGenLists(1); glNewList(ceilingDisplayList, GL_COMPILE); glBegin(GL_QUADS); glTexCoord2f(0, 0); glVertex3f(-gridSize, ceilingHeight, -gridSize); glTexCoord2f(gridSize * 10 * tileSize, 0); glVertex3f(gridSize, ceilingHeight, -gridSize); glTexCoord2f(gridSize * 10 * tileSize, gridSize * 10 * tileSize); glVertex3f(gridSize, ceilingHeight, gridSize); glTexCoord2f(0, gridSize * 10 * tileSize); glVertex3f(-gridSize, ceilingHeight, gridSize); glEnd(); glEndList(); int wallDisplayList = glGenLists(1); glNewList(wallDisplayList, GL_COMPILE); glBegin(GL_QUADS); // North wall glTexCoord2f(0, 0); glVertex3f(-gridSize, floorHeight, -gridSize); glTexCoord2f(0, gridSize * 10 * tileSize); glVertex3f(gridSize, floorHeight, -gridSize); glTexCoord2f(gridSize * 10 * tileSize, gridSize * 10 * tileSize); glVertex3f(gridSize, ceilingHeight, -gridSize); glTexCoord2f(gridSize * 10 * tileSize, 0); glVertex3f(-gridSize, ceilingHeight, -gridSize); // West wall glTexCoord2f(0, 0); glVertex3f(-gridSize, floorHeight, -gridSize); glTexCoord2f(gridSize * 10 * tileSize, 0); glVertex3f(-gridSize, ceilingHeight, -gridSize); glTexCoord2f(gridSize * 10 * tileSize, gridSize * 10 * tileSize); glVertex3f(-gridSize, ceilingHeight, +gridSize); glTexCoord2f(0, gridSize * 10 * tileSize); glVertex3f(-gridSize, floorHeight, +gridSize); // East wall glTexCoord2f(0, 0); glVertex3f(+gridSize, floorHeight, -gridSize); glTexCoord2f(gridSize * 10 * tileSize, 0); glVertex3f(+gridSize, floorHeight, +gridSize); glTexCoord2f(gridSize * 10 * tileSize, gridSize * 10 * tileSize); glVertex3f(+gridSize, ceilingHeight, +gridSize); glTexCoord2f(0, gridSize * 10 * tileSize); glVertex3f(+gridSize, ceilingHeight, -gridSize); // South wall glTexCoord2f(0, 0); glVertex3f(-gridSize, floorHeight, +gridSize); glTexCoord2f(gridSize * 10 * tileSize, 0); glVertex3f(-gridSize, ceilingHeight, +gridSize); glTexCoord2f(gridSize * 10 * tileSize, gridSize * 10 * tileSize); glVertex3f(+gridSize, ceilingHeight, +gridSize); glTexCoord2f(0, gridSize * 10 * tileSize); glVertex3f(+gridSize, floorHeight, +gridSize); glEnd(); glEndList(); int floorDisplayList = glGenLists(1); glNewList(floorDisplayList, GL_COMPILE); glBegin(GL_QUADS); glTexCoord2f(0, 0); glVertex3f(-gridSize, floorHeight, -gridSize); glTexCoord2f(0, gridSize * 10 * tileSize); glVertex3f(-gridSize, floorHeight, gridSize); glTexCoord2f(gridSize * 10 * tileSize, gridSize * 10 * tileSize); glVertex3f(gridSize, floorHeight, gridSize); glTexCoord2f(gridSize * 10 * tileSize, 0); glVertex3f(gridSize, floorHeight, -gridSize); glEnd(); glEndList();

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  • Can I install an Ubuntu app from remote laptop?

    - by Voidcode
    Is their a way to push/send and ubuntu-app/deb-file to be install on my Ubuntu laptop? Usecase... Laptop 1. I find an app, I need to install! But I´am not at home. I just push it to my other laptop to be install.. Laptop 2. I am now at home. My laptop 2 view an dialog asking to install the app I send from laptop 1. Can this be do?.. SSH? Question-update Can it be done so it open Ubuntu Software Center and then laptop2-user only need to write their password and press ok? for non-tec users.. like my father...

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  • Collision detection - player gets stuck in platform when jumping

    - by Sun
    So I'm having some problems with my collision detection with my platformer. Take the image below as an example. When I'm running right I am unable to go through the platform, but when I hold my right key and jump, I end up going through the object as shown in the image, below is the code im using: if(shapePlatform.intersects(player.getCollisionShape())){ Vector2f vectorSide = new Vector2f(shapePlatform.getCenter()[0] - player.getCollisionShape().getCenter()[0], shapePlatform.getCenter()[1] - player.getCollisionShape().getCenter()[1]); player.setVerticleSpeed(0f); player.setJumping(false); if(vectorSide.x > 0 && !(vectorSide.y > 0)){ player.getPosition().set(player.getPosition().x-3, player.getPosition().y); }else if(vectorSide.y > 0){ player.getPosition().set(player.getPosition().x, player.getPosition().y); }else if(vectorSide.x < 0 && !(vectorSide.y > 0)){ player.getPosition().set(player.getPosition().x+3, player.getPosition().y); } } I'm basically getting the difference between the centre of the player and the centre of the colliding platform to determine which side the player is colliding with. When my player jumps and walks right on the platform he goes right through. The same can also be observed when I jump on the actual platform, should I be resetting the players y in this situation?

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  • Is ignoring clients data during an automatic upgrading acceptable?

    - by A competent translator
    I recently faced a deletion of my calendar and notes data inside a third party application ( Horde ) on my online space. When I told the web hosting provider they replied that they were doing an upgrade to system software (!!) and client third party applications are not within their reach or backup policy. They don't even have a backup of my data. Is this practice acceptable from a web hosting provider, even for an individual clients ? I know that backing up my data is my responsibility but I anticipated that backup copies done by the host would be available when needed.

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  • OpenGL Lighting

    - by gopgop
    I have a simple day and night cycle by at day disabling OpenGL lighting and at night enabling openGL Lighting. When I enable everything appears darker. My question is How would I make it that at a specific spot there would be a light that will only light up its surrounding area for example: http://media.giantbomb.com/uploads/0/276/1414275-light_large.png Where the light is is where I want to position my light. My application is in 2D.

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  • How do I implement a "sliding out of / into" effect on a settings menu similar to that in Angry Birds?

    - by VictorB
    I'm trying to implement a settings menu component similar to that in Angry Birds - a button control that makes an options menu slide out of it and back into it when clicked on. I use scene2d.ui to build the UI components: a Button in a Table to implement the button control, a Table to implement the options menu, and a Stack to lay these out one on top of the other and at this moment I have the following behavior: When the user hits the button control for the first time, then the alpha of the table component is set to 1; When the user hits the button control the second time, then the alpha of the table component is set to 0; And so on. Any ideas how I can get the sliding out of and into effect on user clicks with libgdx? Similar to what Angry Birds provides. Maybe using the TweenEngine, actions, interpolations, combinations of these? Thanks in advance.

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  • HowTo Enable jBullet DebugMode

    - by Kenneth Bray
    I would like to render the physics world of jBullet to debug some issues in my game, and I am not finding too much on enabling the debugDraw method of jBullet. Do I need to write my own debugDraw method, or is there an easier way to draw the physics models to the screen? If there is already a built in method I would prefer to use that, otherwise I guess I will start making my own functions to handle this.

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  • How to store a list of Objects that might change in future?

    - by Amogh Talpallikar
    I have set of Objects of the same class which have different values of their attributes. and I need to find the best match from a function under given scenarios out of these objects. In future these objects might increase as well. Quite similar to the way we have Color class in awt. we have some static color objects in the class with diff rgb values. But in my case say, I need to chose the suitable color out of these static ones based on certain criteria. So should I keep them in an arrayList or enum or keep them as static vars as in case of Colors. because I will need to parse through all of them and decide upon the best match. so I need them in some sort of collection. But in future if I need to add another type I will have to modify the class and add another list.add(object) call for this one and then it will violate the open-close principle. How should I go about it ?

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  • Algorithms for Data Redundancy and Failover for distributed storage system?

    - by kennetham
    I'm building a distributed storage system that works with different storage sizes. For instance, my storage devices have sizes of 50GB, 70GB, 150GB, 250GB, 1000GB, 5 storage systems in one system. My application will store any files to the storage system. Question: How can I build a distributed storage with the idea of data redundancy and fail-over to store documents, videos, any type of files at the same time ensuring that should one of any storage devices fail, there would be another copy of these files on another storage device. However, the concern is, 50GB of storage can only store this maximum number of files as compared to 70GB, 150GB etc. With one storage in mind, bringing 5 storage systems like a cloud storage, is there any logical way to distribute or store the files through my application? How do I ensure data redundancy through different storage sizes? Is there any algorithm to collate multiple blob files into a single file archive? What is the best solution for one cloud storage with multiple different storage sizes? I open this topic with the objective of discussing the best way to implement this idea, assuming simplicity, what are the issues of this implementation, performance measurements and discussion of the limitations.

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  • Separate Action from Assertion in Unit Tests

    - by DigitalMoss
    Setup Many years ago I took to a style of unit testing that I have come to like a lot. In short, it uses a base class to separate out the Arrangement, Action and Assertion of the test into separate method calls. You do this by defining method calls in [Setup]/[TestInitialize] that will be called before each test run. [Setup] public void Setup() { before_each(); //arrangement because(); //action } This base class usually includes the [TearDown] call as well for when you are using this setup for Integration tests. [TearDown] public void Cleanup() { after_each(); } This often breaks out into a structure where the test classes inherit from a series of Given classes that put together the setup (i.e. GivenFoo : GivenBar : WhenDoingBazz) with the Assertions being one line tests with a descriptive name of what they are covering [Test] public void ThenBuzzSouldBeTrue() { Assert.IsTrue(result.Buzz); } The Problem There are very few tests that wrap around a single action so you end up with lots of classes so recently I have taken to defining the action in a series of methods within the test class itself: [Test] public void ThenBuzzSouldBeTrue() { because_an_action_was_taken(); Assert.IsTrue(result.Buzz); } private void because_an_action_was_taken() { //perform action here } This results in several "action" methods within the test class but allows grouping of similar tests (i.e. class == WhenTestingDifferentWaysToSetBuzz) The Question Does someone else have a better way of separating out the three 'A's of testing? Readability of tests is important to me so I would prefer that, when a test fails, that the very naming structure of the tests communicate what has failed. If someone can read the Inheritance structure of the tests and have a good idea why the test might be failing then I feel it adds a lot of value to the tests (i.e. GivenClient : GivenUser : WhenModifyingUserPermissions : ThenReadAccessShouldBeTrue). I am aware of Acceptance Testing but this is more on a Unit (or series of units) level with boundary layers mocked. EDIT : My question is asking if there is an event or other method for executing a block of code before individual tests (something that could be applied to specific sets of tests without it being applied to all tests within a class like [Setup] currently does. Barring the existence of this event, which I am fairly certain doesn't exist, is there another method for accomplishing the same thing? Using [Setup] for every case presents a problem either way you go. Something like [Action("Category")] (a setup method that applied to specific tests within the class) would be nice but I can't find any way of doing this.

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  • The input doesn't recognize that I release the key?

    - by joapet99
    I'm creating a window (JOptionPane), in response to a collision. However, if the player is holding a key down when the window pops up, the input doesn't trigger a key release when the key is released. I don't think you can just check it with a isRelease function in the input, since the input is kind of corrupt. Can you help me? The way I check if the key is down: if(input.isKeyDown(Input.KEY_A)&& TestLevel.isFighting == false){ if(owner.canMoveLeft){ position.x -= speed * delta; } } I am not handling the key release by myself, but if I check if the key is down it should work. But it doesn't.

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