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• Wiki Application With A Reputation System

  - by Christofian

  I'm really impressed with Stack Exchange's concept of reputation (you gain reputation as you post, and the more you post, the more privileges you get), and I want to apply the concept to a wiki that I am building. Does anyone know of a php wiki that has a concept of privileges/reputation similar to Stack Exchange? I'm not necessarily looking for something identical to SE, I'm just looking for a wiki application that gives users more privileges the more they contribute positively to the wiki (SE has down votes, the wiki should have some way of identifying negative contributions too). The privileges should be category based, so the more active you are in a specific category or page, the more privileges you get for that category. There should also be site wide privileges as well, though those should be harder to access than the category privileges. NOTE: If it is not possible to get category wide privileges and site wide privileges, I will be OK with just category wide privileges or just site wide privileges. I should be able to change the requirements for each privilege, through a administration panel or through editing a file (some wiki applications don't have administration interfaces). Does anyone have a script or a solution that will do this? If the script uses something similar to reputation to determine how much a user has positively contributed to the site, then that is OK too. Please Note: I am looking for a way to rate individual user contributions, not a way to rate the quality of an entire page.

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• Tools for managing eCommerce backend

  - by rboarman

  I am working with an eCommerce company that has outgrown their hacked together backend for managing inventory, pricing and feeds to various shopping engines (Yahoo, 3d cart, Amazon, etc.). They currently manage about 12,000 skus and are doing $40M in revenue. Their internal people are working on a new Magento solution, but that is six months away and they need to replace/improve their current solution in order to hold them over. Their current solution was developed by two people who have left the company. What tools/architecture do other eCommerce sites use to manage their inventory, pricing, product descriptions and feed generation for the shopping engines? The current solution looks like this: 1) Inventory, pricing and product descriptions are maintained in a database and in NetSuite by employees 2) New products are added to the database via import 3) Twice a week data is extracted into a giant Excel spreadsheet 4) The Excel file adjusts pricing based on some simple algorithms 5) The Excel file exports about six different csv feeds which are manually uploaded to Amazon, 3d cart, Yahoo, Google and Merchant Advantage a. Each feed is a variant of the product which different field names and formatting b. Pricing levels differ between feeds c. Some products are not sent to all feeds 6) Orders are manually parsed and the inventory is adjusted as needed once product is sold The new solution should: 1) Import data from ODBC, CSV and NetSuite (CSV via ftp) 2) Apply pricing changes via simple algorithms (< $80 add $10, $200 add $25) 3) Ensure margins are being met 4) Format and generate a bunch of CSV and XML feeds 5) Perhaps upload feeds to shopping engines automatically What I need to do is replace the Excel file with something that is maintainable and automated. Something in the .Net stack is preferable but not mandatory. I’ve been looking at BizTalk but it may take too long to develop and deploy. Any suggestions?

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• Should a project start with the client or the server?

  - by MadBurn

  Pretty simple question with a complex answer. Should a project start with the client or the server, and why? Where should a single programmer start a client/server project? What are the best practices and what are the reasons behind them? If you can't think of any, what reasons do you use to justify why you would choose to start one before the other? Personally, I'm asking this question because I'm finishing up specs for a project I will be doing for myself on the side for fun. But now that I'm finishing this phase, I'm wondering "ok, now where do I begin?" Since I've never done a project like this by myself, I'm not sure where I should start. In this project, my server will be doing all the heavy lifting and the client will just be sending updates, getting information from the server, and displaying it. But, I don't want that to sway the answer as I'm looking for more of an in depth and less specific answer that would apply to any project I begin in the future.

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• How does Wikipedia's SEO work?

  - by Josh Siegl

  i'm sorry if this question is misplaced or doesn't belong here. I'm currently developing an app for android and IOS and of course i'm thinking about the best ways to market it. Last night I Google'd somebody else's app and the third link in was a Wikipedia page on it, I never even thought of apps having Wikipedia pages, but alas there it was. And of course it was very helpful in determining exactly what the app did and in what cases it was useful for (something that's absolutely crucial for potential customers to understand). So then I got to thinking that I should create a Wiki for my app, but how does Wikipedia apply SEO? I know that the question could be overly complicated or specific, i'm just looking for general answers. For instance when somebody Google's my app, where does Wikipedia display on the results? When I create a Wiki for my app, how do I ensure that the Wikipedia page shows in the search results (is there any way to do that? ) I'm sure i'll find all of this out later when I create a Wiki for my app, I guess i'm just asking this out of curiosity. So how does Wikipedia's search engine optimization work? (on a page by page basis)

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• How to create an Orthographic display in OpenGL (ES) that handles different screen sizes and orientations?

  - by Piku

  I'm trying to create an iPad/iPhone game using GLES2.0 that contains a 3D scene with a heads-up-display/GUI overlaid on the top. However, this problem would also apply if I were to port my game to a computer and run the game in a resizable window, or allow the user to change screen resolutions... When trying to make the 2D GUI/HUD work I've made the assumption that all I'm really doing is drawing a load of 2D textured 'quads' on the screen and am trying to treat the orthographic projection as an old-style 2D display with 0,0 in the upper left and screenWidth,ScreenHeight in the lower right. This causes me all sorts of confusion when I rotate my ipad into Landscape mode since I can't work out what to put into my projection and modelview matrices to turn everything around the right way. It also gets messy if I want to support the iPad's large screen, an iPhone or a Retina display since I have to then draw three sets of textures for everything and work out which ones to use. Should I be trying to map the 2D OpenGL co-ords 1:1 with the screen? While typing out this question it occurs to me that I could keep my origin in the centre, still running -1/+1 along the axes. This would let me scale my 2D content appropriately on the different screen sizes, but wouldn't I end up with the textures being scaled and possibly losing quality? I'm using OpenGLES 2.0 and have a matrix library that has equivalents to the GLES1.1 glOrthof() and glFrustrum() calls.

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• How do I initialize a Scala map with more than 4 initial elements in Java?

  - by GlenPeterson

  For 4 or fewer elements, something like this works (or at least compiles): import scala.collection.immutable.Map; Map<String,String> HAI_MAP = new Map4<>("Hello", "World", "Happy", "Birthday", "Merry", "XMas", "Bye", "For Now"); For a 5th element I could do this: Map<String,String> b = HAI_MAP.$plus(new Tuple2<>("Later", "Aligator")); But I want to know how to initialize an immutable map with 5 or more elements and I'm flailing in Type-hell. Partial Solution I thought I'd figure this out quickly by compiling what I wanted in Scala, then decompiling the resultant class files. Here's the scala: object JavaMapTest { def main(args: Array[String]) = { val HAI_MAP = Map(("Hello", "World"), ("Happy", "Birthday"), ("Merry", "XMas"), ("Bye", "For Now"), ("Later", "Aligator")) println("My map is: " + HAI_MAP) } } But the decompiler gave me something that has two periods in a row and thus won't compile (I don't think this is valid Java): scala.collection.immutable.Map HAI_MAP = (scala.collection.immutable.Map) scala.Predef..MODULE$.Map().apply(scala.Predef..MODULE$.wrapRefArray( scala.Predef.wrapRefArray( (Object[])new Tuple2[] { new Tuple2("Hello", "World"), new Tuple2("Happy", "Birthday"), new Tuple2("Merry", "XMas"), new Tuple2("Bye", "For Now"), new Tuple2("Later", "Aligator") })); I'm really baffled by the two periods in this: scala.Predef..MODULE$ I asked about it on #java on Freenode and they said the .. looked like a decompiler bug. It doesn't seem to want to compile, so I think they are probably right. I'm running into it when I try to browse interfaces in IntelliJ and am just generally lost. Based on my experimentation, the following is valid: Tuple2[] x = new Tuple2[] { new Tuple2<String,String>("Hello", "World"), new Tuple2<String,String>("Happy", "Birthday"), new Tuple2<String,String>("Merry", "XMas"), new Tuple2<String,String>("Bye", "For Now"), new Tuple2<String,String>("Later", "Aligator") }; scala.collection.mutable.WrappedArray<Tuple2> y = scala.Predef.wrapRefArray(x); There is even a WrappedArray.toMap() method but the types of the signature are complicated and I'm running into the double-period problem there too when I try to research the interfaces from Java.

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• Thinking skills to be a good programmer

  - by Paul

  I have been programming for last 15 years with non-CS degree. Main reason I got into programming was that I liked to learn new things and apply them to my work. And I was able to find and fix programming errors and their causes faster than others. But I never find myself a a guru or an expert, maybe due to my non-CS major. And when I saw great programmers, I observed they are very good, much better than me of course, at solving problems. One skill I found good in my mid-career is thinking of requirements and tasks in a reverse order and in abstract. In that way, I can see what is really required for me to do without detail and can quickly find parts of solution that already exist. So I wonder if there are other thinking skills to be a good programmer. I've followed Q&As below and actually read some of books recommended there. But I couldn't really pickup good methods directly applicable for my programming work. What non-programming books should a programmer read to help develop programming/thinking skills? Skills and habits to develop to be good at programming (I'm a newbie)

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• Find meeting point of 2 objects in 2D, knowing (constant) speed and slope

  - by Axonn

  I have a gun which fires a projectile which has to hit an enemy. The problem is that the gun has to be automatic, i.e. - choose the angle in which it has to shoot so that the projectile hits the enemy dead in the center. It's been a looooong time since school, and my physics skills are a bit rusty, but they're there. I've been thinking to somehow apply the v = d/t formula to find the time needed for the projectile or enemy to reach a certain point. But the problem is that I can't find the common point for both the projectile and enemy. Yes, I can find a certain point for the projectile, and another for the enemy, but I would need lots of tries to find where the point coincides, which is stupid. There has to be a way to link them together but I can't figure it out. I prepared some drawings and samples: A simple version of my Flash game, dumbed down to the basics, just some shapes: http://axonnsd.org/W/P001/MathSandBox.swf - click the mouse anywhere to fire a projectile. Or, here is an image which describes my problem: So... who has any ideas about how to find x3/y3 - thus leading me to find the angle in which the weapon has to tilt in order to fire a projectile to meet the enemy? EDIT I think it would be clearer if I also mention that I know: the speed of both Enemy and Projectile and the Enemy travels on a straight vertical line.

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• For those of you who are senior developers what do you look for in a new company and development team?

  - by Amy P

  As I move forward in my career new jobs become more difficult to choose between. When I was starting out and for the first 8 years of my career I took the jobs that I could get that would keep me programming on the general technological path that I was on. I am a job hopper, I only stay with a company for between 2 - 3 years. I think that I do this because after 2 years I get bored and unless there are new projects to keep my busy I no longer find work interesting. Now that I am becoming more experienced it is more important for me to only apply for jobs that are interesting and will move my career and my skill set forward. My problem now is that I keep finding jobs where the projects appear to be interesting during the interview but once I get in the company I find the development environment is sub-par and the development team is disjointed. I feel like I am asking the wrong questions during the interview process and don't know what to look for to make sure that the environment I will be working in will be a good one. Now my question: For those of you who are senior developers what do you look for in a new company and development team? I am looking for the key qualities in a company and development team that you look for when interviewing with a company. These qualities are the ones that would give you hints that the company will be a good one to work for.

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• Stuff you learned in school, that you have never used again?

  - by Mercfh

  Obviously we learn plenty of things in our University/College/Whatever that probably don't apply to everyday use, but is there anything that stands out particularly? Maybe something that was concentrated ALOT on? For me it was def. 2 things: OO Concepts and Pointers I still use OO, but not nearly to the amount people made it out to be, i can see where it'd be useful but in my line of work we don't have huge amounts of classes, maybe a couple at most. And there certainly isn't much OO reuse (i finally figured out what that means lol) Pointers are another thing, again I can see where they'd be useful...however I barely barely ever touch them, nor do the others I work with. I guess language choice has alot to do with that but still. What about you guys? edit: For those who are asking I work for a Large Printer company, and most of the Applications we work on are Java+XML and Actionscript for "Printer Apps". But we are moving towards other languages (think like webkits and stuff). So the Code amounts per parts are quite small. I never say OO wasn't useful I just said I personally havent seen it used in my workplace much.

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• links for 2011-02-07

  - by Bob Rhubart

  Creating JAXWS Service in WebLogic Workshop Middleware Magic Jay SenSharma shares "a simple demo which explains how we can create a Complex JAXWS WebService using WebLogic Workshop." (tags: WebLogic jaxws middleware) Wentari: Re-Learning PeopleSoft "If I truly want to be an enterprise architect, what better way than to have hands on knowledge about all the Oracle offerings outside of my specialization in Siebel and OBIEE." -- Peter Yeung (tags: oracle otn businessintelligence obiee siebel) Andrejus Baranovskis's Blog: CreateWithParams Operation for Oracle ADF BC 11g Oracle ACE Director Andrejus Baranovski illustrates how you can apply a CreateWithParams operation in two easy steps. (tags: oracle otn oracleace soa) APEX plugins contributed to the APEX community by AMIS developers AMIS Technology blog The APEX 4.0 plugin framework "allows for more more organized, better structured development with lots more reuse potential," according to Oracle ACE Director Lucas Jellema. (tags: oracle otn oracleace apex) Oracle BI EE 11g and Oracle ADF - Part 2 - Real Time reporting using View Objects Venkatakrishnan J looks into "another reporting innovation (by use of the common ADF Framework) i.e. real time reporting using BI EE by directly reversing metadata from a transactional application. (tags: oracle otn oracleace businessintelligence obiee adf) On-demand Webcast: Java in the Smart Grid (The Java Source) Learn more about the Smart Grid and the role that Java is poised to play in this important initiative. (tags: oracle otn java smartgrid)

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• KISS principle applied to programming language design?

  - by Giorgio

  KISS ("keep it simple stupid", see e.g. here) is an important principle in software development, even though it apparently originated in engineering. Citing from the wikipedia article: The principle is best exemplified by the story of Johnson handing a team of design engineers a handful of tools, with the challenge that the jet aircraft they were designing must be repairable by an average mechanic in the field under combat conditions with only these tools. Hence, the 'stupid' refers to the relationship between the way things break and the sophistication available to fix them. If I wanted to apply this to the field of software development I would replace "jet aircraft" with "piece of software", "average mechanic" with "average developer" and "under combat conditions" with "under the expected software development / maintenance conditions" (deadlines, time constraints, meetings / interruptions, available tools, and so on). So it is a commonly accepted idea that one should try to keep a piece of software simple stupid so that it easy to work on it later. But can the KISS principle be applied also to programming language design? Do you know of any programming languages that have been designed specifically with this principle in mind, i.e. to "allow an average programmer under average working conditions to write and maintain as much code as possible with the least cognitive effort"? If you cite any specific language it would be great if you could add a link to some document in which this intent is clearly expressed by the language designers. In any case, I would be interested to learn about the designers' (documented) intentions rather than your personal opinion about a particular programming language.

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• I know how to program, and how to learn how to program, but how/where do you learn how to make systems properly?

  - by Ryan

  There are many things that need to be considered when making a system, let's take for example a web based system where users log in and interact with each other, creating and editing content. Now I have to think about security, validation (I don't even think I am 100% sure what that entails), "making sure users don't step on each others feet" (term for this?), preventing errors in many cases, making sure database data doesn't become problematic through unexpected... situations? All these things I don't know how or where to learn, is there a book on this kind of stuff? Like I said there seems to be a huge difference between writing code and actually writing the right code, know what I mean? I feel like my current programming work lacks much of what I have described and I can see the problems it causes later, and then the problems are much harder to solve because data exists and people are using it. So can anyone point me to books or resources or the proper subset of programming(?) for this type of learning? PS: feel free to correct my tags, I don't know what I am talking about. Edit: I assume some of the examples I wrote apply to other types of systems too, I just don't know any other good examples because I've been mostly involved in web work.

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• June 2012 Critical Patch Update for Java SE Released

  - by Eric P. Maurice

  Hi, this is Eric Maurice. Oracle just released the June 2012 Critical Patch Update for Java SE.  This Critical Patch Update provides 14 new security fixes across Java SE products.  As discussed in previous blog entries, Critical Patch Updates for Java SE will, for the foreseeable future, continue to be released on a separate schedule than that of other Oracle products due to previous commitments made to Java customers.  12 of the 14 Java SE vulnerabilities fixed in this Critical Patch Update may be remotely exploitable without authentication.  6 of these vulnerabilities have a CVSS Base Score of 10.0.  In accordance with Oracle’s policies, these CVSS 10 scores represent instances where a user running a Java applet or Java Web Start application has administrator privileges (as is typical on Windows XP).  When the user does not run with administrator privileges (typical on the Solaris and Linux operating systems), the corresponding CVSS impact scores for Confidentiality, Integrity, and Availability for these vulnerabilities would be "Partial" instead of "Complete", thus lowering these CVSS Base Scores to 7.5. Due to the high severity of these vulnerabilities, Oracle recommends that customers obtain and apply these security fixes as soon as possible: Developers should download the latest release at http://www.oracle.com/technetwork/java/javase/downloads/index.html    Java users should download the latest release of JRE at http://java.com, and of course  Windows users can take advantage of the Java Automatic Update to get the latest release. In addition, Oracle recommends removing old an unused versions  of Java as the latest version is always the recommended version as it contains the most recent enhancements, and bug and security fixes.  For more information: •Instructions on removing older (and less secure) versions of Java can be found at http://java.com/en/download/faq/remove_olderversions.xml  •Users can verify that they’re running the most recent version of Java by visiting: http://java.com/en/download/installed.jsp   •The Advisory for the June 2012 Critical Patch Update for Java SE is located at http://www.oracle.com/technetwork/topics/security/javacpujun2012-1515912.html

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• Why was my site rejected for Google Adsense?

  - by hyuun jjang

  I have a 3 year old blog and its got around 16 articles/tutorials about some programming problems and solutions. It's getting pretty much a lot of view lately so I decided to apply for a google adsense account. When I first applied via blogger, google replied with the following statement: Page Type: In order to participate in Google AdSense, publishers' websites and application information must satisfy the following guidelines: - Your website must be your own top-level domain (www.example.com and not www.example.com/mysite). - You must provide accurate personal information with your application that matches the information on your domain registration. - Your website must contain substantial, original content... So, as I understood it, I decide to buy a domain and point my blogger blog to that new naked domain. and here is the newly bought domain where all the contents of my old blog resides. http://icodeya.com/ I reapplied, hoping that this time, I will make the cut. But then I got this reply Further detail: Unable to review your site: While reviewing http://www.icodeya.com/, we found that your site was down or unavailable. We suggest you check whether there was a typo in the URL submitted. When your site is operational, you can resubmit your application with the correct site by following the directions below. I'm a bit disappointed. Maybe I did something wrong with DNS configuration or something. But you can clearly see that my site is fully functional. I heard that google sends robots to crawl on to the site etc. It's just sad because I invested on a domain name, and now I can't even find ways to earn from it. Any tips?

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• Refactoring and Open / Closed principle

  - by Giorgio

  I have recently being reading a web site about clean code development (I do not put a link here because it is not in English). One of the principles advertised by this site is the Open Closed Principle: each software component should be open for extension and closed for modification. E.g., when we have implemented and tested a class, we should only modify it to fix bugs or to add new functionality (e.g. new methods that do not influence the existing ones). The existing functionality and implementation should not be changed. I normally apply this principle by defining an interface I and a corresponding implementation class A. When class A has become stable (implemented and tested), I normally do not modify it too much (possibly, not at all), i.e. If new requirements arrive (e.g. performance, or a totally new implementation of the interface) that require big changes to the code, I write a new implementation B, and keep using A as long as B is not mature. When B is mature, all that is needed is to change how I is instantiated. If the new requirements suggest a change to the interface as well, I define a new interface I' and a new implementation A'. So I, A are frozen and remain the implementation for the production system as long as I' and A' are not stable enough to replace them. So, in view of these observation, I was a bit surprised that the web page then suggested the use of complex refactorings, "... because it is not possible to write code directly in its final form." Isn't there a contradiction / conflict between enforcing the Open / Closed Principle and suggesting the use of complex refactorings as a best practice? Or the idea here is that one can use complex refactorings during the development of a class A, but when that class has been tested successfully it should be frozen?

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• Which is a better practice - helper methods as instance or static?

  - by Ilian Pinzon

  This question is subjective but I was just curious how most programmers approach this. The sample below is in pseudo-C# but this should apply to Java, C++, and other OOP languages as well. Anyway, when writing helper methods in my classes, I tend to declare them as static and just pass the fields if the helper method needs them. For example, given the code below, I prefer to use Method Call #2. class Foo { Bar _bar; public void DoSomethingWithBar() { // Method Call #1. DoSomethingWithBarImpl(); // Method Call #2. DoSomethingWithBarImpl(_bar); } private void DoSomethingWithBarImpl() { _bar.DoSomething(); } private static void DoSomethingWithBarImpl(Bar bar) { bar.DoSomething(); } } My reason for doing this is that it makes it clear (to my eyes at least) that the helper method has a possible side-effect on other objects - even without reading its implementation. I find that I can quickly grok methods that use this practice and thus help me in debugging things. Which do you prefer to do in your own code and what are your reasons for doing so?

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• Geekswithblogs.net Influencer Programm

  - by Staff of Geeks

  Recently, @StaffOfGeeks announced to a select group of bloggers, the Geekswithblogs.net Influencer Program.  Here is a little detail about the program. Description (from Influencer Page): Geekswithblogs.net is a community of bloggers passionate about contributing information to the world of developers and IT professionals. Our bloggers are some of the best in the world and receive honors on a regular basis for outside companies (such as the Microsoft© MVP Program). The Geekswithblogs.net Influencer Program is our way as Staff of Geeks to show our appreciation for those bloggers who have the greatest influence on the site. Each influencer in the program is awarded by the amount of posts, views, and comments they receive on their posts in the previous quarter. Each quarter, we select the top 25 bloggers of influence and give them special access to products and services we have obtained through our network of partners. Here is how it works.  Each quarter we select the top 25 bloggers bases on the amount of posts that created in that quarter, and apply points to the views and comments those posts receive.  The selection is purely off of the numbers, we do not select any based on any other basis.  In fact in the first round, several of our key bloggers did not qualify in the top 25.  Though they are still loved dearly, we wanted a program that anyone could be a part of if they put in the hard work. This said, the first quarter ends at the end of March and we will have another round of influencers joining us.  Keep the posts rolling and maybe you will be selected as an influencer! Visit the influencers page to see who has the greatest influence on Geekswithblogs right now.   Technorati Tags: Geekswithblogs

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• Added resolution not working after upgrading to 12.04

  - by David

  After upgrading, my screen resolution (added by xrandr comands on the start) did not work like before. Messages appear showing some errors (that i have never had in 11.10). "No se pudo aplicar la configuración almacenada para los monitores"/"Can't apply the stored configuration for the monitors." This script didn't work either. xrandr --newmode "1280x1024_60.00" 109.00 1280 1368 1496 1712 1024 1027 1034 1063 -hsync +vsync xrandr --addmode VGA1 1280x1024_60.00 xrandr --output VGA1 --mode 1280x1024_60.00 I also tryed deleting monitors.xml but, nothing. This only erase the window message. It's been sayd that ##It's a normal buggy and well know problem for Pc's with Intel integrated video cards.## The new version of gnome-settings-daemon stores its configuration information in dconf rather than gconf. I tryed something, but the problem persist. This is what i did. Install the dconf-tools package, and then run dconf-editor. In the tree on the left, navigate org - gnome - settings-daemon - plugins - xrandr. Uncheck the active checkbox. restart your XServer (Ctrl+Alt+Backspace) (It didn't worked out for me, but it may be helpful to someone)

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• Simple Architecture Verification

  - by Jean Carlos Suárez Marranzini

  I just made an architecture for an application with the function of scoring, saving and loading tennis games. The architecture has 2 kinds of elements: components & layers. Components: Standalone elements that can be consumed by other components or by layers. They might also consume functionality from the model/bottom layer. Layers: Software components whose functionality rests on previous layers (except for the model layer). -Layers: -Models: Data and it's behavior. -Controllers: A layer that allows interaction between the views and the models. -Views: The presentation layer for interacting with the user. -Components: -Persistence: Makes sure the game data can be stored away for later retrieval. -Time Machine: Records changes in the game through time so it's possible to navigate the game back and forth. -Settings: Contains the settings that determine how some of the game logic will apply. -Game Engine: Contains all the game logic, which it applies to the game data to determine the path the game should take. This is an image of the architecture (I don't have enough rep to post images): http://i49.tinypic.com/35lt5a9.png The requierements which this architecture should satisfy are the following: Save & load games. Move through game history and see how the scoreboard changes as the game evolves. Tie-breaks must be properly managed. Games must be classified by hit-type. Every point can be modified. Match name and player names must be stored. Game logic must be configurable by the user. I would really appreciate any kind of advice or comments on this architecture. To see if it is well built and makes sense as a whole. I took the idea from this link. http://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller

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• Friday Tips #6, Part 2

  - by Chris Kawalek

  Here is a question about updating Oracle VM: Question: How can I perform Oracle VM 3 server updates from Oracle VM Manager? Answer by Gregory King, Principal Best Practices Consultant, Oracle VM Product Management: Server Update Manager is a built-in feature of the Oracle VM Manager. Basically, Server Update Manager automatically configures YUM updates on all the Oracle VM Servers, pointing each to our Unbreakable Linux Network (ULN) update channel for Oracle VM. The servers periodically check with our Oracle YUM repository and notify the Oracle VM Manager that an update is available for each server. Actual server updates must be triggered by the Oracle VM administrator – they are not executed automatically. At this point, you can use the Oracle VM Manager to put a server into maintenance mode which live migrates all the running Oracle VM Guests to other Oracle VM Servers in the server pool. Once all the Oracle VM Guests have been migrated, the Oracle VM administrator can trigger the update on the server. The entire process is documented in the Installation and Upgrade Guide of Oracle VM Documentation so I won’t spend time detailing the steps. However, configuring the Server Update Manager is exceedingly simple. Simply navigate to the Tools and Resources tab in the Oracle VM Manager, select the link for Server Update Manager and ensure the following values are added to the text boxes as shown in the illustration below: YUM Base URL: http://public-yum.oracle.com/repo/OracleVM/OVM3/latest/x86_64 YUM GPG Key: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-oracle Every server in the pool will be automatically configured for YUM updates once you choose the Apply button. Many thanks to Greg and Rick for providing the answers to this week's questions. If you want to ask us something, hit up Twitter and use hashtag #AskOracleVirtualization. See you next week! -Chris 

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• December 2012 OTN Member Offers

  - by Cassandra Clark - OTN

  Our partners have answered the special offer call just in time for you to either shop for the tech professional in your life or share the list below with someone who keeps asking you what you want for the holidays.  Go right to the Oracle Technology Network Member Discount Page or read on for more details. Oracle  Store has extended their 10% Savings through December 31st 2012.Oracle Press - Oracle Technology Network members get 40% off the latest Oracle Press book by Oracle ACE Directors Ben Prusinski and Gustavo Gonzalez, Oracle E-Business Suite Financials Handbook, Third Edition in print and ebook format. CRC Press - Has added 3 NEW titles!  Get 20% off the below title at checkout. Secure Java: For Web Application Development Open Source Data Warehousing and Business Intelligence Developing Essbase Applications: Advanced Techniques for Finance and IT Professional Oracle Embedded Programming and Application Development Packt Publishing - Get 25% off the print books and get 35% off the eBooks listed below. You will need to be logged in for the discounts to apply at checkout and codes expire December 31st 2012. Getting Started with Oracle Data Integrator 11g: A Hands-On Tutorial Oracle Business Intelligence Enterprise Edition 11g: A Hands-On Tutorial Oracle Certified Associate, Java SE 7 Programmer Study Guide Safari Online-  Give the Gift of Knowledge This Holiday SeasonGive your friends and colleagues the gift of Safari Books Online! With an ever-expanding library of books and videos from more than 100 publishers (including Oracle Press), a subscription to Safari Books Online is the gift that always fits, helping your friends learn new skills and stay current. Starting at $42.99, gift subscriptions are available for 1, 3, 6 and 12 months. Get all of this and more at the Oracle Technology Network Member Discount Page!

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• Work experience before masters

  - by RJadhav

  I dont know if its the right place to ask such questions: I have a bachelors degree from an Indian university. I want to persue masters in one of the universities in usa, my profile is good enough to get me admitted to the school that I want to get into. I also have an offer letter from one of the top software companies in India (Infosys). I dont know which path to take, I know a masters degree will be of great help in future both in terms of money and career but I do not know whether I want to do it at this moment. I have signed up for both edx and coursera for some of the courses and I really liked learning them online. I am not sure if taking these courses can be a substitute for a masters degree. Also how will i be able to differentiate myself in the real world if I do not have a masters degree, since there are many in india who dont have it. And is it advisable for me to take some work experience say 1-2 years and then apply for a masters degree. Although universities do not explicitly mention work experience as a criteria, will any kind of work experience help me in deciding whether i want to do masters? finally I want to know what are the cons of not doing a masters.

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• How do you KISS?

  - by Conor

  The KISS principle is a highly quoted design mantra. The aim of this principle is to stamp out unnecessary complexity on a project. This is a good thing, saving time, energy and money. It can lead to a relatively stress free implementation and a simple, elegant, maintainable end product. A lot of discussion on KISS provides mechanisms to simplify requirements, design and implementation. Things that spring to mind include: avoid scope creep; simple obvious design and code; minimal run-time dependencies; refactoring to maintain simplicity; etc. However there are a lot of implicit things that we do to KISS. Examples: small team sizes; minimal management layers; tidy desk; mastery of a single IDE; clear concise error messages; scripts to automate/encapsulate tasks; etc Why KISS practices do you apply? How have they been of benefit? I'm especially interested in non-obvious practices.

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• Matrix.CreateBillboard centre rotation problem

  - by Chris88

  I'm having an issue with Matrix.CreateBillboard and a textured Quad where the center axis seems to be positioned incorrectly to the quad object which is rotating around a center point: Using: BasicEffect quadEffect; Drawing the quad shape: Left = Vector3.Cross(Normal, Up); Vector3 uppercenter = (Up * height / 2) + origin; LowerLeft = uppercenter + (Left * width / 2); LowerRight = uppercenter - (Left * width / 2); UpperLeft = LowerLeft - (Up * height); UpperRight = LowerRight - (Up * height); Where height and width are float values passed in (it draws a square) Draw method: quadEffect.View = camera.view; quadEffect.Projection = camera.projection; quadEffect.World = Matrix.CreateBillboard(Origin, camera.cameraPosition, Vector3.Up, camera.cameraDirection); GraphicsDevice.BlendState = BlendState.Additive; foreach (EffectPass pass in quadEffect.CurrentTechnique.Passes) { pass.Apply(); GraphicsDevice.DrawUserIndexedPrimitives <VertexPositionNormalTexture>( PrimitiveType.TriangleList, Vertices, 0, 4, Indexes, 0, 2); } GraphicsDevice.BlendState = BlendState.Opaque; In the screenshots below i draw the image at Vector3(32f, 0f, 32f) The screenshots below show you the position of the quad in relation to the red cross. The red cross shows where it should be drawn http://i.imgur.com/YwRYj.jpg http://i.imgur.com/ZtoHL.jpg It rotates around the red cross position

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