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• Getting Started with Amazon Web Services in NetBeans IDE

  - by Geertjan

  When you need to connect to Amazon Web Services, NetBeans IDE gives you a nice start. You can drag and drop the "itemSearch" service into a Java source file and then various Amazon files are generated for you. From there, you need to do a little bit of work because the request to Amazon needs to be signed before it can be used. Here are some references and places that got me started: http://associates-amazon.s3.amazonaws.com/signed-requests/helper/index.html http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSGettingStartedGuide/AWSCredentials.html https://affiliate-program.amazon.com/gp/flex/advertising/api/sign-in.html You definitely need to sign up to the Amazon Associates program and also register/create an Access Key ID, which will also get you a Secret Key, as well. Here's a simple Main class that I created that hooks into the generated RestConnection/RestResponse code created by NetBeans IDE: public static void main(String[] args) {    try {        String searchIndex = "Books";        String keywords = "Romeo and Juliet";        RestResponse result = AmazonAssociatesService.itemSearch(searchIndex, keywords);        String dataAsString = result.getDataAsString();        int start = dataAsString.indexOf("<Author>")+8;        int end = dataAsString.indexOf("</Author>");        System.out.println(dataAsString.substring(start,end));    } catch (Exception ex) {        ex.printStackTrace();    }} Then I deleted the generated properties file and the authenticator and changed the generated AmazonAssociatesService.java file to the following: public class AmazonAssociatesService {    private static void sleep(long millis) {        try {            Thread.sleep(millis);        } catch (Throwable th) {        }    }    public static RestResponse itemSearch(String searchIndex, String keywords) throws IOException {        SignedRequestsHelper helper;        RestConnection conn = null;        Map queryMap = new HashMap();        queryMap.put("Service", "AWSECommerceService");        queryMap.put("AssociateTag", "myAssociateTag");        queryMap.put("AWSAccessKeyId", "myAccessKeyId");        queryMap.put("Operation", "ItemSearch");        queryMap.put("SearchIndex", searchIndex);        queryMap.put("Keywords", keywords);        try {            helper = SignedRequestsHelper.getInstance(                    "ecs.amazonaws.com",                    "myAccessKeyId",                    "mySecretKey");            String sign = helper.sign(queryMap);            conn = new RestConnection(sign);        } catch (IllegalArgumentException | UnsupportedEncodingException | NoSuchAlgorithmException | InvalidKeyException ex) {        }        sleep(1000);        return conn.get(null);    }} Finally, I copied this class into my application, which you can see is referred to above: http://code.google.com/p/amazon-product-advertising-api-sample/source/browse/src/com/amazon/advertising/api/sample/SignedRequestsHelper.java Here's the completed app, mostly generated via the drag/drop shown at the start, but slightly edited as shown above: That's all, now everything works as you'd expect.

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• Why do Core Data sqlite table columns start with 'Z'?

  - by Dia

  I was looking at the sqlite table that Core Data generates and noticed that all table columns start with 'Z'. I realize this is an implementation detail, but I was curious as to why that's the case and if there was a design decision involved in this. Anyone happen to know or guess why? Here's a sample schema output of Core Data sqlite database: sqlite .schema CREATE TABLE ZPOST ( Z_PK INTEGER PRIMARY KEY, Z_ENT INTEGER, Z_OPT INTEGER, ZPOSTID INTEGER, ZUSER INTEGER, ZCREATEDAT TIMESTAMP, ZTEXT VARCHAR ); CREATE TABLE ZUSER ( Z_PK INTEGER PRIMARY KEY, Z_ENT INTEGER, Z_OPT INTEGER, ZUSERID INTEGER, ZAVATARIMAGEURLSTRING VARCHAR, ZUSERNAME VARCHAR ); CREATE TABLE Z_METADATA (Z_VERSION INTEGER PRIMARY KEY, Z_UUID VARCHAR(255), Z_PLIST BLOB); CREATE TABLE Z_PRIMARYKEY (Z_ENT INTEGER PRIMARY KEY, Z_NAME VARCHAR, Z_SUPER INTEGER, Z_MAX INTEGER);

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• Point Light Soft Shadows

  - by notabene

  How to implement soft shadows for omni directional (point) light. We use typical shadow mapping technique. Depth is rendered to texture cube and addresing is pretty simple then. Just using vector from light to fragments world position. It works perfectly. Until you want soft shadows. In our engine we use PCSS technique for spot lights. But for point light there begins troubles. How to sample in 3D? I developed technique when orthonormal basis is created from a direction and upvector (0,1,0). And then multiply sampling vector (something like this (1.0,i/depthMapSize,j/depthMapSize) with this basis. But this (of course :)) looks pretty bad for vectors near (0,1,0) and (0,-1,0). I will appreciate any help on this.

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• Are there any open source projects for car engine sound simulation?

  - by Petteri Hietavirta

  I have been thinking how to create realistic sound for a car. The main sound is the engine, then all kind of wind, road and suspension sounds. Are there any open source projects for the engine sound simulation? Simply pitching up the sample does not sound too great. The ideal would be to something that allows me to pick type of the engine (i.e. inline-4 vs v-8), add extras like turbo/supercharger whine and finally set the load and rpm. Edit: Something like http://www.sonory.org/examples.html

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• SilverlightShow for 13-19 Dec 2010

  - by Dave Campbell

  I still haven't updated my friends at SilverlightShow, but I have their list from last week. Check out the Top Five most popular news at SilverlightShow for last week (13 - 19 Dec 2010). First place for the past week takes the post about Mahesh Sabnis' sample Line-Of-Business app using Silverlight 4. A lot of clicks and downloads got also the recording of SilverlightShow webinar 'Building an end-to-end Silverlight 4 Application' presented by Gill Cleeren on Dec 15th. Here is SilverlightShow's weekly top 5: Line of Business (LOB) Application using Silverlight 4, WCF 4, EF 4 and Commanding Architecture Recording, Demos and Slides of the Webinar 'Build an End-to-end Silverlight 4 Application' SilverlightShow Content Updating to Silverlight 4 Free Webcam Photo Application in Silverlight Unit testing MVVM in Silverlight - SDN Event-Code and Slides Visit and bookmark SilverlightShow. Stay in the 'Light

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• Usefulness of the Backlinks shown in Webmaster Tools

  - by Ewan Heming

  Is the list of links for a site shown in Google Webmaster Tools a complete list or just a sample? I've noticed that the links in there appear to be all the ones I didn't think would have any real value - either because they were nofollow or from irrelivant sites. The few I did think would be some use have never shown up and there's also some links that are sometimes there and sometimes not (such as my linkedIn profile). Does this mean that the missing links don't/no longer carry any value? It almost appears that the list is there for Google to either inform you about problems (there was a useful list there when someone tried to SPAM my site) or mis-imform you about which link-building strategies work or not (to keep people guessing about what works or not).

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• Microsoft Access 2010 Tips and Tricks

  Make Use of Templates If you are totally new to Access 2010 and are worried about starting your own database from scratch, don't worry, as Microsoft has loaded the program with tons of templates to help you get started. The templates range across different industries to cover varying needs, and you can begin using them by simply deleting the sample data and inserting your own. As a side note, you can cut down on browsing time spent on looking for a template by going to the BackStage View's New tab and typing a descriptive term into the Search field. This should give you some results of relat...

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• Best way to load rigid bodies from file

  - by Mel

  I'm trying to switch to bullet for physics simulation. Lemme just say first that I am so pleased with bullet's accuracy and performance. After messing around it for a bit, I'm now trying to load rigid bodies from files. Most of my models are in blender and with some searching, I was able to export them in .bullet format. However, loading the files into bullet doesn't look like an easy task. I've come across this page that points me to a sample application that loads bullet files. But then it goes and says that this loader is just a starting point. Is there any open source library out there that will allow me to load rigid bodies from a file? I don't really wanna spend that much time trying to create my own loader.

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• Google Chrome and Theora

  - by Michas

  I have problem with Google Chrome and Theora video. I have video that plays nice in Opera and Firefox. However, it doesn't play in Google browser and I don't know why. I've made this video in ogg2theora. Test sample: http://wwsi.edu.pl/video/enigma.html Does anyone know how should I encode to Theora that Google Chrome works? P.S. I am not interested in encoding in WebM or h.264, this time. I am not asking what is the best way to publish video on a website. I only do experiments with Ogg Theora. The test site has fallback for h.264 in video tag and WMV in WMP plugin.

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• Coordinating team code review sessions [closed]

  - by Wade Tandy

  My question has two parts: 1) In your team or organization, do you ever do in-person code reviews with all or part of a team, as opposed to online reviews using some sort of tool? 2) How do you structure these meetings? Do you choose to focus on one person's code in a given meeting? Do you look at everything? Take a random sample? Ask people on the team what they'd like to have looked at of theirs? I'd love to add this practice to my development team, so I'd like to hear how others are doing it.

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• Button click event in the Ogre3d for ios

  - by user1184398

  Is it possible to access the button click event by using the cursor? These are the steps I followed for the button click event using the SDK trays m_pTrayMgr = new OgreBites::SdkTrayManager("TrayMgr", m_pRenderWnd, m_pMouse, this); I create the buttons m_LeftBtn = tray->createButton(OgreBites:: TL_LEFT, "sdk_button_down", "Left"); m_RightBtn = tray->createButton(OgreBites::TL_RIGHT, "sdk_button_up", "Right"); And I am calling this function void OgreFramework::buttonHit(OgreBites::Button* button) { if(button->getName().compare("sdk_button_down") == 0 ) { printf("XXX"); } } But the button hit function is not getting called... Could somebody provide some sample code? I'm not using any cursor for the click.

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• How to ask questions on the Forums

  - by TATWORTH

  Based upon answering many questions on forums such as forums.asp.net, here are some tips on getting your questions answered, once you have exhausted searching on your own. Choose a concise but meaningful title but avoid words like "urgent" Post to the correct section of the forum - some people specialise in a particular section of a given forum Make it clear that you have already made an effort to answer yourself. Summerise the environmental context of your question e.g. If using SQL then state the version e.g. SQLExpress 2008 If you need to post a code or markup sample, tidy it up by removing extraneous blank lines and set the tab spacing to 2 rather than 4. Take your time composing the question so that it is set out as clearly as possible. Remember that the majority of people providing answers do so in their own time. Be very polite and thank those that help you.

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• Avoiding coupling

  - by Seralize

  It is also true that a system may become so coupled, where each class is dependent on other classes that depend on other classes, that it is no longer possible to make a change in one place without having a ripple effect and having to make subsequent changes in many places.[1] This is why using an interface or an abstract class can be valuable in any object-oriented software project. Quote from Wikipedia Starting from scratch I'm starting from scratch with a project that I recently finished because I found the code to be too tightly coupled and hard to refactor, even when using MVC. I will be using MVC on my new project aswell but want to try and avoid the pitfalls this time, hopefully with your help. Project summary My issue is that I really wish to keep the Controller as clean as possible, but it seems like I can't do this. The basic idea of the program is that the user picks wordlists which is sent to the game engine. It will pick random words from the lists until there are none left. Problem at hand My main problem is that the game will have 'modes', and need to check the input in different ways through a method called checkWord(), but exactly where to put this and how to abstract it properly is a challenge to me. I'm new to design patterns, so not sure whether there exist any might fit my problem. My own attempt at abstraction Here is what I've gotten so far after hours of 'refactoring' the design plans, and I know it's long, but it's the best I could do to try and give you an overview (Note: As this is the sketch, anything is subject to change, all help and advice is very welcome. Also note the marked coupling points): Wordlist class Wordlist { // Basic CRUD etc. here! // Other sample methods: public function wordlistCount($user_id) {} // Returns count of how many wordlists a user has public function getAll($user_id) {} // Returns all wordlists of a user } Word class Word { // Basic CRUD etc. here! // Other sample methods: public function wordCount($wordlist_id) {} // Returns count of words in a wordlist public function getAll($wordlist_id) {} // Returns all words from a wordlist public function getWordInfo($word_id) {} // Returns information about a word } Wordpicker class Wordpicker { // The class needs to know which words and wordlists to exclude protected $_used_words = array(); protected $_used_wordlists = array(); // Wordlists to pick words from protected $_wordlists = array(); /* Public Methods */ public function setWordlists($wordlists = array()) {} public function setUsedWords($used_words = array()) {} public function setUsedWordlists($used_wordlists = array()) {} public function getRandomWord() {} // COUPLING POINT! Will most likely need to communicate with both the Wordlist and Word classes /* Protected Methods */ protected function _checkAvailableWordlists() {} // COUPLING POINT! Might need to check if wordlists are deleted etc. protected function _checkAvailableWords() {} // COUPLING POINT! Method needs to get all words in a wordlist from the Word class } Game class Game { protected $_session_id; // The ID of a game session which gets stored in the database along with game details protected $_game_info = array(); // Game instantiation public function __construct($user_id) { if (! $this->_session_id = $this->_gameExists($user_id)) { // New game } else { // Resume game } } // This is the method I tried to make flexible by using abstract classes etc. // Does it even belong in this class at all? public function checkWord($answer, $native_word, $translation) {} // This method checks the answer against the native word / translation word, depending on game mode public function getGameInfo() {} // Returns information about a game session, or creates it if it does not exist public function deleteSession($session_id) {} // Deletes a game session from the database // Methods dealing with game session information protected function _gameExists($user_id) {} protected function _getProgress($session_id) {} protected function _updateProgress($game_info = array()) {} } The Game /* CONTROLLER */ /* "Guess the word" page */ // User input $game_type = $_POST['game_type']; // Chosen with radio buttons etc. $wordlists = $_POST['wordlists']; // Chosen with checkboxes etc. // Starts a new game or resumes one from the database $game = new Game($_SESSION['user_id']); $game_info = $game->getGameInfo(); // Instantiates a new Wordpicker $wordpicker = new Wordpicker(); $wordpicker->setWordlists((isset($game_info['wordlists'])) ? $game_info['wordlists'] : $wordlists); $wordpicker->setUsedWordlists((isset($game_info['used_wordlists'])) ? $game_info['used_wordlists'] : NULL); $wordpicker->setUsedWords((isset($game_info['used_words'])) ? $game_info['used_words'] : NULL); // Fetches an available word if (! $word_id = $wordpicker->getRandomWord()) { // No more words left - game over! $game->deleteSession($game_info['id']); redirect(); } else { // Presents word details to the user $word = new Word(); $word_info = $word->getWordInfo($word_id); } The Bit to Finish /* CONTROLLER */ /* "Check the answer" page */ // ?????????????????? ( http://pastebin.com/cc6MtLTR ) Make sure you toggle the 'Layout Width' to the right for a better view. Thanks in advance. Questions To which extent should objects be loosely coupled? If object A needs info from object B, how is it supposed to get this without losing too much cohesion? As suggested in the comments, models should hold all business logic. However, as objects should be independent, where to glue them together? Should the model contain some sort of "index" or "client" area which connects the dots? Edit: So basically what I should do for a start is to make a new model which I can more easily call with oneliners such as $model->doAction(); // Lots of code in here which uses classes! How about the method for checking words? Should it be it's own object? I'm not sure where I should put it as it's pretty much part of the 'game'. But on another hand, I could just leave out the 'abstraction and OOPness' and make it a method of the 'client model' which will be encapsulated from the controller anyway. Very unsure about this.

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• Oracle OpenWorld Update -- Get in the Cloud Now: Building Real Applications with the Java Cloud Service

  - by Ruma Sanyal

  Today we want to highlight a really exciting session focused on what it takes to build a typical application on the Oracle Cloud using the Java Cloud Service. Come to this session to learn the technical ins and outs of building such applications, what services you can use and how you should evaluate the Java Cloud Service for your applications. Whether you are new to the cloud or a veteran of building cloud solutions on other platforms, this will be a dive into the practical issues in the development - tools, build environment, and deployment approaches - that will help you go back home and try the Java Cloud Service out with your applications. This session will include a live demo and a sample application you will be able to try out yourself on the Java Cloud Service. For more information about this and other Cloud Application Foundation sessions, review the Oracle Cloud Application Foundation Focus On document.  Details: Wednesday, Oct 3,  1.15 -- 2.15pm, Marriott Marquis Foothill F  

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• Houston We have a Problem with Silverlight Client OM&hellip;

  - by MOSSLover

  So I was playing around with NavigationNodeCollection, which is basically like SPNavigationNodeCollection just to make sure it worked without a hitch…Here is a little sample snippet of what should work: Unfortunately, you get a nice little javascript error that does not allow you to access the child nodes.  I tried a foreach() loop that gets a NavigationNode for each parent then loops through the NavigationNode.Children that did not work either.  I threw in two ExecuteQueryAsync statements thinking that would help, unfortunately adding a second statement provides no different results.  This appears to be a bug in the Silverlight Client Object Model.  I reported the error.  Hopefully, we get a fix by RTM so that we can use the easier method to get items into Silverlight, otherwise it’s back to WCF and cross domain policies.  We all love cross domain policies right? Technorati Tags: Client Object Model,SharePoint 2010,Silverlight

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• Alternatives to multiple sprite batches for achieving 2D particle system depth

  - by Ergwun

  In my 2D XNA game, I render all my sprites with a single sprite batch using SpriteSortMode.BackToFront and BlendState.AlphaBlend. I'm adding a particle system based on the App Hub particles sample. Since this uses SpriteSortMode.Deferred and BlendState.Additive, I will need to have two SpriteBatch.Begin / SpriteBatch.End pairs: one for 'regular' sprites, and one for particles. In my top-down shooter, If I want to have explosions appear under planes, but above the ground, then I believe I will have to have three Begin/End pairs, first to draw everything under the explosions, then to draw the explosions, then to draw everything above the explosions. If I want to have particle effects at multiple different depths, then I'm going to need even more Begin/Endpairs. This is all easy to code, but I'm wondering if there is an alternative way to handle this?

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• Building iPhone Interfaces for Oracle E-Business Suite

  - by Shay Shmeltzer

  Over on his blog Juan has been showing you how simple it is to develop a rich Web user interface with ADF accessing Oracle E-Business Suite data and even exposing it on an iPad. In this entry I'm starting from his sample application and I'm showing how easy it is to build an interface that will look great on an iPhone (or other mobile devices) using Oracle ADF Mobile Browser. For those of you who are just using ADF and never tried ADF Mobile Browser - you'll find that the development experience is quite familiar and similar to your normal Web application development. In the latest version of JDeveloper (11.1.2.1) which I'm usingin this demo we have a built-in skin that will give your application the native iOS look and feel. In the demo I achieve this by setting the styleclass of a tr:panelHeader component to af_m_toolbar to get this. For more on this styling read the doc. Check out this quick demo:

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• How to verify the Liskov substitution principle in an inheritance hierarchy?

  - by Songo

  Inspired by this answer: Liskov Substitution Principle requires that Preconditions cannot be strengthened in a subtype. Postconditions cannot be weakened in a subtype. Invariants of the supertype must be preserved in a subtype. History constraint (the "history rule"). Objects are regarded as being modifiable only through their methods (encapsulation). Since subtypes may introduce methods that are not present in the supertype, the introduction of these methods may allow state changes in the subtype that are not permissible in the supertype. The history constraint prohibits this. I was hoping if someone would post a class hierarchy that violates these 4 points and how to solve them accordingly. I'm looking for an elaborate explanation for educational purposes on how to identify each of the 4 points in the hierarchy and the best way to fix it. Note: I was hoping to post a code sample for people to work on, but the question itself is about how to identify the faulty hierarchies :)

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• Change default display of the Ubuntu screen

  - by r15

  Currently I am working on a customize device which has Ubuntu 12.10. Now I have to restructure the screen of that device. I have added sample design of the screen. We are getting this screen when we start the device. How can I achive this. I know for this I have make changes in many configuration files of ubuntu. But I don't know how to start and in which files I have to make changes. So that I need some guidelines for this? and we are using lightdm as display manager. Feel free to ask me any question and sorry for bad english.

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• How to study for an Informatics Olympiad [on hold]

  - by Cloud

  One of my goals for next year is to participate in the Australian Informatics Olympiad. As far as I'm aware, it is not too different from Informatics Olympiads in other countries. What would be the best way to study for this? What content should I pay particular attention to while learning in Python? I am currently using the book 'Learn Python the hard way', but are there any other books worthy of a mention? This is the link to their site: http://orac.amt.edu.au/aio/ It contains sample questions, so you can get an idea for the structure or nature of the competition. I know this isn't really a specific programming question, but it would be great if someone could share their experience or give some suggestions for me.

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• SQLSaturday #60 - Cleveland Rocks!

  - by Mike C

  Looking forward to seeing all the DBAs, programmers and BI folks in Cleveland at SQLSaturday #60 tomorrow! I'll be presenting on (1) Intro to Spatial Data and (2) Build Your Own Search Engine in SQL. I've reworked the Spatial Data presentation based on feedback from previous SQLSaturday events and added more sample code. I also expanded the Build Your Own Search Engine code samples to demonstrate additional FILESTREAM functionality. See you all tomorrow! A little road music, please! http://www.youtube.com/watch?v=vU0JpyH1gC...(read more)

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• What do you do when one thinks the code isn't complicated enough?

  - by Chris

  After six months of development on a project, our stakeholders have had a "gut check" and have decided that the path that we've been walking (a custom designed application framework and data access layer) is holding us (the developers) back from quickly developing the features they would like to see. After several days of debate management and the development team have decided to scrap the current incarnation and start over using ASP.net MVC, with Entity Framework as the bases of the a 'quick and dirty', lets just get it done project. In days following, our senior developer who has never worked with MVC or Entity Framework has finally gotten into a sample project and done some work. His take on ASP.net MVC, "this is not software engineering". So my question is this; what do you do, when one doesn't think the code is complicated enough?

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• GeoToolkit Demo Embedded in an Application Framework via Maven

  - by Geertjan

  As a follow on to yesterday's blog entry, here's the equivalent starter application for GeoToolkit (also known as Geotk) on the NetBeans Platform, which ends up looking like this: The above is a border.shp file I found on-line, while here's a USA states shape file rendered in the application: Note that the navigation bar is also included, though that could later be migrated into the menu bar of the NetBeans Platform.  Download the Maven based NetBeans Platform application with GeoToolkit integration here: http://java.net/projects/nb-api-samples/sources/api-samples/show/versions/7.3/tutorials/geospatial/geotoolkit/MyGeospatialSystem It was quite tricky getting this sample together, parts of it, especially the installer, which creates the database, comes from the Puzzle GIS project, while the files come from on-line locations, with the JAI-related dependencies providing problems of their own. But it's definitely a starting point and you now have the basic Maven structure needed for getting started with GeoToolkit in the context of all the services and components provided by the NetBeans Platform.  Many thanks to Johann Sorel for his patience and help. 

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• HackingSilverlight Code Browser

  So sometime ago I had been working on a sample browser for all the different samples I had used for hackingsilverlight and for blog posts. After awhile with all the jumping around between projects, and my failing memory I found I needed a quick easy way to remember all the code clips I used often. For me I needed something like a rola-deck for code so after taking my toys and leaving the sandbox as it were regarding the book HackingSilverlight between projects for the 5 minutes here or there I've...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Very slow direct3D texture sampling

  - by __dominic

  Hi, So I'm writing a small game using Direct3D 9 and I'm using multitexturing for the terrain. All I'm doing is sampling 3 textures and a blend map and getting the overall color from the three textures based on the color channels from the blend map. Anyway, I am getting a massive frame rate drop when I sample more than 1 texture, I'm going from 120+ fps to just under 50. This is the HLSL code responsible for the slow down: float3 ground = tex2D(GroundTex, multiTex).rgb; float3 stone = tex2D(StoneTex, multiTex).rgb; float3 grass = tex2D(GrassTex, multiTex).rgb; float3 blend = tex2D(BlendMapTex, blendMap).rgb; Am I doing it wrong ? If anyone has any info or tips about texture sampling or anything, that would be nice. Thanks.

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