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  • Cocos2d-x CCFollow Zooming issue

    - by blakey87
    Hi I am currently building a cocos2d-x game which incorporates pinch zoom using CCLayerPanZoom class which can be found here The problem is basically when using CCFollow and zooming and out, it does'nt zoom on the actually followed node, so the camera appears to zoom towards the bottom left corner of the screen, when I would rather it zoom centrally on the followed node. If I could resolve this I would pretty darn happy. I converted a fix from the cocos2d objective C version in the CCfollow class to cocos2d-x which improved the issue,but if you look at the post in latter link you will see the guy is having the exact same problem, he gave up on fixing it sadly. I think its close but I don't really know what going on, hopefully someone out there has already faced and fixed this problem. My converted code is below. CCPoint p1 = ccpMult(m_obHalfScreenSize, m_pTarget->getScale() ); CCPoint p2 = ccpMult(m_pobFollowedNode->getPosition(), m_pTarget->getScale() ); CCPoint offect = ccpMult(ccpSub(p1, m_obHalfScreenSize), 0.5f); CCPoint tempPos = ccpAdd(ccpSub(p1, p2), offect); m_pTarget->setPosition(ccp(clampf(tempPos.x,m_fLeftBoundary,m_fRightBoundary), clampf(tempPos.y,m_fBottomBoundary,m_fTopBoundary))); I have attached before and after to hopefully make things more clear.

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  • SQL SERVER – Guest Post – Architecting Data Warehouse – Niraj Bhatt

    - by pinaldave
    Niraj Bhatt works as an Enterprise Architect for a Fortune 500 company and has an innate passion for building / studying software systems. He is a top rated speaker at various technical forums including Tech·Ed, MCT Summit, Developer Summit, and Virtual Tech Days, among others. Having run a successful startup for four years Niraj enjoys working on – IT innovations that can impact an enterprise bottom line, streamlining IT budgets through IT consolidation, architecture and integration of systems, performance tuning, and review of enterprise applications. He has received Microsoft MVP award for ASP.NET, Connected Systems and most recently on Windows Azure. When he is away from his laptop, you will find him taking deep dives in automobiles, pottery, rafting, photography, cooking and financial statements though not necessarily in that order. He is also a manager/speaker at BDOTNET, Asia’s largest .NET user group. Here is the guest post by Niraj Bhatt. As data in your applications grows it’s the database that usually becomes a bottleneck. It’s hard to scale a relational DB and the preferred approach for large scale applications is to create separate databases for writes and reads. These databases are referred as transactional database and reporting database. Though there are tools / techniques which can allow you to create snapshot of your transactional database for reporting purpose, sometimes they don’t quite fit the reporting requirements of an enterprise. These requirements typically are data analytics, effective schema (for an Information worker to self-service herself), historical data, better performance (flat data, no joins) etc. This is where a need for data warehouse or an OLAP system arises. A Key point to remember is a data warehouse is mostly a relational database. It’s built on top of same concepts like Tables, Rows, Columns, Primary keys, Foreign Keys, etc. Before we talk about how data warehouses are typically structured let’s understand key components that can create a data flow between OLTP systems and OLAP systems. There are 3 major areas to it: a) OLTP system should be capable of tracking its changes as all these changes should go back to data warehouse for historical recording. For e.g. if an OLTP transaction moves a customer from silver to gold category, OLTP system needs to ensure that this change is tracked and send to data warehouse for reporting purpose. A report in context could be how many customers divided by geographies moved from sliver to gold category. In data warehouse terminology this process is called Change Data Capture. There are quite a few systems that leverage database triggers to move these changes to corresponding tracking tables. There are also out of box features provided by some databases e.g. SQL Server 2008 offers Change Data Capture and Change Tracking for addressing such requirements. b) After we make the OLTP system capable of tracking its changes we need to provision a batch process that can run periodically and takes these changes from OLTP system and dump them into data warehouse. There are many tools out there that can help you fill this gap – SQL Server Integration Services happens to be one of them. c) So we have an OLTP system that knows how to track its changes, we have jobs that run periodically to move these changes to warehouse. The question though remains is how warehouse will record these changes? This structural change in data warehouse arena is often covered under something called Slowly Changing Dimension (SCD). While we will talk about dimensions in a while, SCD can be applied to pure relational tables too. SCD enables a database structure to capture historical data. This would create multiple records for a given entity in relational database and data warehouses prefer having their own primary key, often known as surrogate key. As I mentioned a data warehouse is just a relational database but industry often attributes a specific schema style to data warehouses. These styles are Star Schema or Snowflake Schema. The motivation behind these styles is to create a flat database structure (as opposed to normalized one), which is easy to understand / use, easy to query and easy to slice / dice. Star schema is a database structure made up of dimensions and facts. Facts are generally the numbers (sales, quantity, etc.) that you want to slice and dice. Fact tables have these numbers and have references (foreign keys) to set of tables that provide context around those facts. E.g. if you have recorded 10,000 USD as sales that number would go in a sales fact table and could have foreign keys attached to it that refers to the sales agent responsible for sale and to time table which contains the dates between which that sale was made. These agent and time tables are called dimensions which provide context to the numbers stored in fact tables. This schema structure of fact being at center surrounded by dimensions is called Star schema. A similar structure with difference of dimension tables being normalized is called a Snowflake schema. This relational structure of facts and dimensions serves as an input for another analysis structure called Cube. Though physically Cube is a special structure supported by commercial databases like SQL Server Analysis Services, logically it’s a multidimensional structure where dimensions define the sides of cube and facts define the content. Facts are often called as Measures inside a cube. Dimensions often tend to form a hierarchy. E.g. Product may be broken into categories and categories in turn to individual items. Category and Items are often referred as Levels and their constituents as Members with their overall structure called as Hierarchy. Measures are rolled up as per dimensional hierarchy. These rolled up measures are called Aggregates. Now this may seem like an overwhelming vocabulary to deal with but don’t worry it will sink in as you start working with Cubes and others. Let’s see few other terms that we would run into while talking about data warehouses. ODS or an Operational Data Store is a frequently misused term. There would be few users in your organization that want to report on most current data and can’t afford to miss a single transaction for their report. Then there is another set of users that typically don’t care how current the data is. Mostly senior level executives who are interesting in trending, mining, forecasting, strategizing, etc. don’t care for that one specific transaction. This is where an ODS can come in handy. ODS can use the same star schema and the OLAP cubes we saw earlier. The only difference is that the data inside an ODS would be short lived, i.e. for few months and ODS would sync with OLTP system every few minutes. Data warehouse can periodically sync with ODS either daily or weekly depending on business drivers. Data marts are another frequently talked about topic in data warehousing. They are subject-specific data warehouse. Data warehouses that try to span over an enterprise are normally too big to scope, build, manage, track, etc. Hence they are often scaled down to something called Data mart that supports a specific segment of business like sales, marketing, or support. Data marts too, are often designed using star schema model discussed earlier. Industry is divided when it comes to use of data marts. Some experts prefer having data marts along with a central data warehouse. Data warehouse here acts as information staging and distribution hub with spokes being data marts connected via data feeds serving summarized data. Others eliminate the need for a centralized data warehouse citing that most users want to report on detailed data. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Best Practices, Business Intelligence, Data Warehousing, Database, Pinal Dave, PostADay, Readers Contribution, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • Java Spotlight Episode 77: Donald Smith on the OpenJDK and Java

    - by Roger Brinkley
    Tweet An interview with Donald Smith about Java and OpenJDK. Joining us this week on the Java All Star Developer Panel are Dalibor Topic, Java Free and Open Source Software Ambassador and Arun Gupta, Java EE Guy. Right-click or Control-click to download this MP3 file. You can also subscribe to the Java Spotlight Podcast Feed to get the latest podcast automatically. If you use iTunes you can open iTunes and subscribe with this link:  Java Spotlight Podcast in iTunes. Show Notes News Jersey 2.0 Milestone 2 available Oracle distribution of Eclipse (OEPE) now supports GlassFish 3.1.2 Oracle Linux 6 is now part of the certification matrix for 3.1.2 3rd part of Spring -> Java EE 6 article series published Joe Darcy - Repeating annotations in the works JEP 152: Crypto Operations with Network HSMs JEP 153: Launch JavaFX Applications OpenJDK bug database: Status update OpenJDK Governing Board 2012 Election: Results jtreg update March 2012 Take Two: Comparing JVMs on ARM/Linux The OpenJDK group at Oracle is growing App bundler project now open Events April 4-5, JavaOne Japan, Tokyo, Japan April 11, Cleveland JUG, Cleveland, OH April 12, GreenJUG, Greenville, SC April 17-18, JavaOne Russia, Moscow Russia April 18–20, Devoxx France, Paris, France April 17-20, GIDS, Bangalore April 21, Java Summit, Chennai April 26, Mix-IT, Lyon, France, May 3-4, JavaOne India, Hyderabad, India May 5, Bangalore, Pune, ?? - JUG outreach May 7, OTN Developer Day, Mumbai May 8, OTN Developer Day, Delhi Feature InterviewDonald Smith, MBA, MSc, is Director of Product Management for Oracle. He brings worldwide enterprise software experience, ranging from small "dot-com" through Fortune 500 companies. Donald speaks regularly about Java, open source, community development, business models, business integration and software development politics at conferences and events worldwide including Java One, Oracle World, Sun Tech Days, Evans Developer Relations Conference, OOPSLA, JAOO, Server Side Symposium, Colorado Software Summit and others. Prior to returning to Oracle, Donald was Director of Ecosystem Development for the Eclipse Foundation, an independent not-for-profit foundation supporting the Eclipse open source community. Mail Bag What’s Cool OpenJDK 7 port to Haiku JEP 154: Remove Serialization Goto for the Java Programming Language

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  • Should we always prefer OpenGL ES version 2 over version 1.x

    - by Shivan Dragon
    OpengGL ES version 2 goes a long way into changing the development paradigm that was established with OpenGL ES 1.x. You have shaders which you can chain together to apply varios effects/transforms to your elements, the projection and transformation matrices work completly different etc. I've seen a lot of online tutorials and blogs that simply say "ditch version 1.x, use version 2, that's the way to go". Even on Android's documentation it sais to "use version 2 as it may prove faster than 1.x". Now, I've also read a book on OpenGL ES (which was rather good, but I'm not gonna mention here because I don't want to give the impression that I'm trying to make hidden publicity). The guy there treated only OpenGL ES 1.x for 80% of the book, and then at the end only listed the differences in version 2 and said something like "if OpenGL ES 1 does what you need, there's no need to switch to version 2, as it's only gonna over complicate your code. Version 2 was changed a lot to facillitate newer, fancier stuff, but if you don't need it, version 1.x is fine". My question is then, is the last statement right? Should I always use Open GL ES version 1.x if I don't need version 2 only stuff? I'd sure like to do that, because I find coding in version 1.x A LOT simpler than version 2 but I'm afraid that my apps might get obsolete faster for using an older version.

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  • FREE Online Azure Workshop includes a **FREE Azure Account**

    - by Jim Duffy
    My friend and all around good guy, Microsoft Developer Evangelist for the Carolinas, Brian Hitney, along with fellow Microsofties Jim O’Neil and John McClelland will be presenting a FREE Windows Azure online workshop tomorrow, Tuesday, May 4th from 7pm-9pm. What? You can’t make it Tuesday evening? Not to worry. This webcast will be repeated again a number of times over the next month or so. Taken from Brian’s blog post about it: “Elevate your skills with Windows Azure in this hands-on workshop! In this event we’ll guide you through the process of building and deploying a large scale Azure application. Forget about “hello world”! In less than two hours we’ll build and deploy a real cloud app that leverages the Azure data center and helps make a difference in the world. Yes, in addition to building an application that will leave you with a rock-solid understanding of the Azure platform, the solution you deploy will contribute back to Stanford’s Folding@home distributed computing project. There’s no cost to you to participate in this session; each attendee will receive a temporary, self-expiring, full-access account to work with Azure for a period of 2-weeks.” Did you catch that last sentence??  “each attendee will receive a temporary, self-expiring, full-access account to work with Azure for a period of 2-weeks.” A FREE, full-access, Windows Azure account to experiment and learn with? Now we’re talking. For more information check out Brian’s blog post or head here. Have a day. :-|

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  • Some SharePoint NDA Information

    - by Sahil Malik
    Ad:: SharePoint 2007 Training in .NET 3.5 technologies (more information). Many years ago, at the last to last to last MVP summit, Microsoft was kind enough to share with us what they were thinking wayyyyyyyyyyyy ahead! I specially remember John Durant talking about the specific enhancements planned for SharePoint 2010 development experience. If you haven’t seen John Durant talking on stage, the guy has more enthusiasm than tiger woods in Amsterdam! The energy of his presentations is simply amazing. So, I pulled out my phone, and I snapped a picture! And, I emailed that picture to everyone in the MVP land, and Microsoft land, saying “We have evidence”, i.e. here are the promises that were made, and dammit we’ll see by the time you release SP2010 how many of these do you actually release. Here is the picture ladies and gentlemen -     It’s a good karate chop action shot isn’t it? Of course, we were all immediately warned not to share any of this seriously strictly NDA information at the time. Well, now that the information is out in the world, I can finally share now, this small tidbit of how far ahead Microsoft is thinking in their plans. Frankly, I wouldn’t be surprised, if today that they have a very clear idea what SharePoint vNext will be all about, or should I say vNextvNext? Have fun! Comment on the article ....

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  • Java Spotlight Episode 84: Anil Gaur on JavaEE 7

    - by Roger Brinkley
    Tweet Interview with Anil Gaur, VP of Java Platform for Enterprise Edition and GlassFish Server, on JavaEE 7. Joining us this week on the Java All Star Developer Panel are Dalibor Topic, Java Free and Open Source Software Ambassador and Arun Gupta, Java EE Guy. Right-click or Control-click to download this MP3 file. You can also subscribe to the Java Spotlight Podcast Feed to get the latest podcast automatically. If you use iTunes you can open iTunes and subscribe with this link:  Java Spotlight Podcast in iTunes. Show Notes News Tori Wieldt - Judges Selected for Duke's Choice Awards Donald Smith - #OpenJDK interview in Java Magazine Henrik Ståhl - Java 7 adoption at 23% JavaOne Kicks Off with Sunday Keynotes at Masonic Auditorium Jersey 2.0 M4 JSF 2.2 Latest Snapshot NetBeans IDE 7.2 - Deploy to Cloud Events May 30, OTN Java Developer Day, Redwood Shores June 11-14, Cloud Computing Expo, New York City June 12, Boulder JUG June 13, Denver JUG June 13, Eclipse Juno DemoCamp, Redwoood Shore June 13, JUG Münster June 14, Java Klassentreffen, Vienna, Austria June 18-20, QCon, New York City June 26-28, Jazoon, Zurich, Switzerland July 5, Java Forum, Stuttgart, Germany July 30-August 1, JVM Language Summit, Santa Clara Feature InterviewAnil Gaur is the Vice President of Java Platform, Enterprise Edition, and GlassFish Server at Oracle in the Fusion Middleware Group. Is responsible for creation of Java EE Specifications, Reference Implementation, and Compatibility Test Suites. Leading the evolution on Java EE into Cloud and PaaS environment through the Java EE 7 standard. Prior to that, managed the delivery of Java EE 6 Platform and SDK which quickly gained momentum in enterprise application development and deployments. In this episode we talk about GlassFish 3.1 release. Mail Bag What’s Cool RFR (L): Adding core file parsing on Mac OS X to SA Sergio Del Valle @swdelvalle is the 1,000 @JavaSpotlight twitter follower

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  • Java Spotlight Episode 86: Tony Printezis on Garbage Collection First

    - by Roger Brinkley
    Interview with Tony Printezis on Garbage Collection First (GC1). Joining us this week on the Java All Star Developer Panel is Arun Gupta, Java EE Guy. Right-click or Control-click to download this MP3 file. You can also subscribe to the Java Spotlight Podcast Feed to get the latest podcast automatically. If you use iTunes you can open iTunes and subscribe with this link:  Java Spotlight Podcast in iTunes. Show Notes News JSR 358: A major revison of the Java Community Process - JCP 3.Next JAX-RS 2.0 Early Draft- Third Edition Events June 11-14, Cloud Computing Expo, New York City June 12, Boulder JUG June 13, Denver JUG June 13, Eclipse Juno DemoCamp, Redwoood Shore June 13, JUG Münster June 14, Java Klassentreffen, Vienna, Austria June 18-20, QCon, New York City June 19, CJUG, Chicago June 20, 1871, Chicago June 26-28, Jazoon, Zurich, Switzerland Jun 27, Houston JUG ?? July 5, Java Forum, Stuttgart, Germany Jul 13-14, IndicThreads, Delhi July 30-August 1, JVM Language Summit, Santa Clara Feature InterviewTony Printezis is a Principal Member of Technical Staff at Oracle, based in Burlington, MA. He has been contributing to the Java HotSpot Virtual Machine since 2006. He spends most of his time working on dynamic memory management for the Java platform, concentrating on performance, scalability, responsiveness, parallelism, and visualization of garbage collectors. He obtained a Ph.D. in 2000 and a BSc (Hons) in 1995, both from the University of Glasgow in Scotland. In addition, he is a JavaOne Rock Star, a title awarded for his highly rated JavaOne session on GC. Mail Bag What’s Cool JavaOne content selection is complete. Notifications done.

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  • Rolling your own Hackathon

    - by Terrance
    Background Info Hey, I pitched the idea of a company Hackathon that would donate our time to a charity to work on a project (for free) to improve morale in my company and increase developer cohesion. As it turns out most like the idea but, guess who's gonna be the one to put it together. lol Yeah me. I should add that we are a fairly small shop with about 10-12 programmers (some pull double duty as programmers, inters etc..) So, that might make things a bit easier. Base Question While I am no means a project manager or of any level of authority (Entry level guy) I was wondering if anyone knew the best approach for someone in my position to put together such an even with possibly (some) company backing. Or for that matter have any helpful advice to pass along to a young padawan. So far..... As of right now it is just an idea so, to start with I presumably would have to put together some sort of proposal and do some that office stuff that I became a programmer to steer clear of to some extent.

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  • Common mistakes which lead to corrupted invariants

    - by Dave B.
    My main source of income is web development and through this I have come to enjoy the wonders of programming as my knowledge of different languages has increased over the years through work and personal play. At some point I reached a decision that my college education was not enough and that I wanted to go back to school to get a university degree in either computer science or software engineering. I have tried a number of things in my life and it took me a while before I found something that I feel is a passion and this is it. There is one aspect of this area of study that I find throws me off though. I find the formal methods of proving program correctness a challenge. It is not that I have trouble writing code correctly, I can look at an algorithm and see how it is correct or flawed but I struggle sometimes to translate this into formal definitions. I have gotten perfect or near perfect marks on every programming assignment I have done at the college level but I recently got a swath of textbooks from a guy from univeristy of waterloo and found that I have had trouble when it comes to a few of the formalisms. Well at this point its really just one thing specifically, It would really help me if some of you could provide to me some good examples of common mistakes which lead to corrupted invariants, especially in loops. I have a few software engineering and computer science textbooks but they only show how things should be. I would like to know how things go wrong so that it is easier to recognize when it happens. Its almost embarrassing to broach this subject because formalisms are really basic foundations upon which matters of substance are built. I want to overcome this now so that it does not hinder me later.

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  • Inside Red Gate - Introduction

    - by Simon Cooper
    I work for Red Gate Software, a software company based in Cambridge, UK. In this series of posts, I'll be discussing how we develop software at Red Gate, and what we get up to, all from a dev's perspective. Before I start the series proper, in this post I'll give you a brief background to what I have done and continue to do as part of my job. The initial few posts will be giving an overview of how the development sections of the company work. There is much more to a software company than writing the products, but as I'm a developer my experience is biased towards that, and so that is what this series will concentrate on. My background Red Gate was founded in 1999 by Neil Davidson & Simon Galbraith, who continue to be joint CEOs. I joined in September 2007, and immediately set to work writing a new Check for Updates client and server (CfU), as part of a team of 2. That was finished at the end of 2007. I then joined the SQL Compare team. The first large project I worked on was updating SQL Compare for SQL Server 2008, resulting in SQL Compare 7, followed by a UI redesign in SQL Compare 8. By the end of this project in early 2009 I had become the 'go-to' guy for the SQL Compare Engine (I'll explain what that means in a later post), which is used by most of the other tools in the SQL Tools division in one way or another. After that, we decided to expand into Oracle, and I wrote the prototype for what became the engine of Schema Compare for Oracle (SCO). In the latter half of 2009 a full project was started, resulting in the release of SCO v1 in early 2010. Near the end of 2010 I moved to the .NET division, where I joined the team working on SmartAssembly. That's what I continue to work on today. The posts in this series will cover my experience in software development at Red Gate, within the SQL Tools and .NET divisions. Hopefully, you'll find this series an interesting look at what exactly goes into producing the software at Red Gate.

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  • Are You Using Windows Live Mesh?

    - by Ben Griswold
    Most of the time, I’m the guy who authors the show notes for the Herding Code Podcast.  The workflow is relatively straight-forward: Jon shares the pre-production audio with me, I compete my write up and then ship the notes back to Jon for publishing with the edited audio.  All file sharing is all done with shared folders in the Windows Live Mesh. The director of my kid’s preschool was looking for a way to access her work computer from her home office.  VPN connection?  Remote desktop?  FTP?  Nope. I installed Windows Live Mesh in a matter of minutes, synchronized a number of folders and she was off and running.  (The neat thing is she’s running a PC in the office and a Mac at home.) I was using Dropbox before discovering Mesh. Dropbox is still very cool but I’m in and out of Mesh enough that it’s taken over.  Actually I still have a Dropbox folder – it’s just being synched by Mesh now. If you’re interested in giving Live Mesh a whirl, here’ are the notable links as found on the product’s site: What you need Create your mesh Sync folders Share folders Use your Live Desktop Connect to a remote computer Use a mobile phone Good luck!

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  • How to conciliate OOAD and Database Design?

    - by user1620696
    Recently I've studied about object oriented analysis and design and I liked a lot about it. In every place I've read people say that the idea is to start with the minimum set of requirements and go improving along the way, revisiting this each iteration and making it better as we contiuously develop and contact the customer interested in the software. In particular, one course from Lynda.com said a lot of that: we don't want to spend a lot of time planing everything upfront, we just want to have the minimum to get started and then improve this each iteration. Now, I've also seem a course from the same guy about database design, and there he says differently. He says that although when working with object orientation he likes the agile iterative approach, for database design we should really spend a lot of time planing things upfront instead of just going along the way with the minimum. But this confuses me a little. Indeed, the database will persist important data from our domain model and perhaps configurations of the software and so on. Now, if I'm going to continuously revist the analysis and design of the model, it seems the database design should change also. In the same way, if we plan all the database upfront it seems we are also planing all the model upfront, so the two ideas seems to be incompatible. I really like agile iterative approach, but I'm also looking at getting better design for the database also, so when working with agile iterative approach, how should we deal with the database design?

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  • The art of Unit Testing with Examples in .NET

    - by outcoldman
    First time when I familiarized with unit testing was 5 or 6 years ago. It was start of my developing career. I remember that somebody told me about code coverage. At that time I didn’t write any Unit tests. Guy, who was my team lead, told me “Do you see operator if with three conditions? You should check all of these conditions”. So, after that I had written some code, I should go to interface and try to invoke all code which I wrote from user interface. Nice? At current time I know little more about tests and unit testing. I have not participated in projects, designed by Test Driven Development (TDD). Basics of my knowledge are a spying code of my colleagues, some articles and screencasts. I had decide that I should know much more, and became a real professional of unit testing, this is why I had start to read book The art of Unit Testing with Examples in .NET. More than, in my current job place looks like I’m just one who writing unit tests for my code. I should show good examples of my tests. ,a href="http://outcoldman.ru/en/blog/show/267"Read more...

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  • Learning frameworks without learning languages

    - by Tom Morris
    I've been reading up on GUI frameworks including WPF, GTK and Cocoa (UIKit). I don't really do anything related to Windows (I'm a Mac and Linux guy) or .NET, but I'd like to be able to throw together GUIs for various operating systems. We are in the enviable position now of having high level scripting languages that work with all of the major GUI toolkits. If you are doing Linux GUI programming, you could use GTK in C, but why not just use PyGTK (or PyQt). Similarly, for Java, one can use JRuby. For Mac, there's MacRuby. And on .NET, there's IronRuby. This is all fine and good, and if you are building a serious project, there are tradeoffs that you might encounter when deciding whether to, say, build a WPF app in C# or in IronRuby, or whether you are going to use PyGTK or not. The subjective question I have is: what about learning those frameworks? Are there strong reasons why one should or should not learn something like WPF or Cocoa in a language one is familiar with rather than having to learn a new language as well? I'm not saying you should never learn the language. If you are building Windows applications and you don't know C#, that might be a bit of a problem. But do you think it is okay to learn the framework first? This is both a general question and a specific question. I've used some Cocoa classes from Ruby and Python using things like PyObjC and there always seems to be an impedance mismatch because of the way Objective C libraries get built. Experiences and strong opinions welcome!

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  • Change in Job Title and Responsibilities

    - by John Conwell
    I've spent the past 7 years focused primarily on code and database performance.  It's an area that I have a passion for, as well as a propensity.  But what I've found is that its very hard to change the culture of a development environment.  You can teach performance, you can encourage performance, you might see slight shift in how devs think about performance.  But without full management backing and support you wont get long lasting changes in the development culture.  And in the end, you are back to being the "Perf Guy", fixing performance design flaws, after the fact, one by one by one. Which is why last year I asked my boss to changed my title and responsibilities to more naturally align with the team I was working for.  So now I'm a Computing Research Engineer (vague, I know), researching in the field of Big Data analytics and visualization. I've found this change revitalizing and a lot of fun.  And given the nature of Big Data (its, um…big) the performance aspects are always ever present.

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  • Rockmelt, the technology adoption model, and Facebook's spare internet

    - by Roger Hart
    Regardless of how good it is, you'd have to have a heart of stone not to make snide remarks about Rockmelt. After all, on the surface it looks a lot like some people spent two years building a browser instead of just bashing out a Chrome extension over a wet weekend. It probably does some more stuff. I don't know for sure because artificial scarcity is cool, apparently, so the "invitation" is still in the post*. I may in fact never know for sure, because I'm not wild about Facebook sign-in as a prerequisite for anything. From the video, and some initial reviews, my early reaction was: I have a browser, I have a Twitter client; what on earth is this for? The answer, of course, is "not me". Rockmelt is, in a way, quite audacious. Oh, sure, on launch day it's Bay Area bar-chat for the kids with no lenses in their retro specs and trousers that give you deep-vein thrombosis, but it's not really about them. Likewise,  Facebook just launched Google Wave, or something. And all the tech snobbery and scorn packed into describing it that way is irrelevant next to what they're doing with their platform. Here's something I drew in MS Paint** because I don't want to get sued: (see: The technology adoption lifecycle) A while ago in the Guardian, John Lanchester dusted off the idiom that "technology is stuff that doesn't work yet". The rest of the article would be quite interesting if it wasn't largely about MySpace, and he's sort of got a point. If you bolt on the sentiment that risk-averse businessmen like things that work, you've got the essence of Crossing the Chasm. Products for the mainstream market don't look much like technology. Think for  a second about early (1980s ish) hi-fi systems, with all the knobs and fiddly bits, their ostentatious technophile aesthetic. Then consider their sleeker and less (or at least less conspicuously) functional successors in the 1990s. The theory goes that innovators and early adopters like technology, it's a hobby in itself. The rest of the humans seem to like magic boxes with very few buttons that make stuff happen and never trouble them about why. Personally, I consider Apple's maddening insistence that iTunes is an acceptable way to move files around to be more or less morally unacceptable. Most people couldn't care less. Hence Rockmelt, and hence Facebook's continued growth. Rockmelt looks pointless to me, because I aggregate my social gubbins with Digsby, or use TweetDeck. But my use case is different and so are my enthusiasms. If I want to share photos, I'll use Flickr - but Facebook has photo sharing. If I want a short broadcast message, I'll use Twitter - Facebook has status updates. If I want to sell something with relatively little hassle, there's eBay - or Facebook marketplace. YouTube - check, FB Video. Email - messaging. Calendaring apps, yeah there are loads, or FB Events. What if I want to host a simple web page? Sure, they've got pages. Also Notes for blogging, and more games than I can count. This stuff is right there, where millions and millions of users are already, and for what they need it just works. It's not about me, because I'm not in the big juicy area under the curve. It's what 1990s portal sites could never have dreamed of achieving. Facebook is AOL on speed, crack, and some designer drugs it had specially imported from the future. It's a n00b-friendly gateway to the internet that just happens to serve up all the things you want to do online, right where you are. Oh, and everybody else is there too. The price of having all this and the social graph too is that you have all of this, and the social graph too. But plenty of folks have more incisive things to say than me about the whole privacy shebang, and it's not really what I'm talking about. Facebook is maintaining a vast, and fairly fully-featured training-wheels internet. And it makes up a large proportion of the online experience for a lot of people***. It's the entire web (2.0?) experience for the early and late majority. And sure, no individual bit of it is quite as slick or as fully-realised as something like Flickr (which wows me a bit every time I use it. Those guys are good at the web), but it doesn't have to be. It has to be unobtrusively good enough for the regular humans. It has to not feel like technology. This is what Rockmelt sort of is. You're online, you want something nebulously social, and you don't want to faff about with, say, Twitter clients. Wow! There it is on a really distracting sidebar, right in your browser. No effort! Yeah - fish nor fowl, much? It might work, I guess. There may be a demographic who want their social web experience more simply than tech tinkering, and who aren't just getting it from Facebook (or, for that matter, mobile devices). But I'd be surprised. Rockmelt feels like an attempt to grab a slice of Facebook-style "Look! It's right here, where you already are!", but it's still asking the mature market to install a new browser. Presumably this is where that Facebook sign-in predicate comes in handy, though it'll take some potent awareness marketing to make it fly. Meanwhile, Facebook quietly has the entire rest of the internet as a product management resource, and can continue to give most of the people most of what they want. Something that has not gone un-noticed in its potential to look a little sinister. But heck, they might even make Google Wave popular.     *This was true last week when I drafted this post. I got an invite subsequently, hence the screenshot. **MS Paint is no fun any more. It's actually good in Windows 7. Farewell ironically-shonky diagrams. *** It's also behind a single sign-in, lending a veneer of confidence, and partially solving the problem of usernames being crummy unique identifiers. I'll be blogging about that at some point.

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  • SharePoint MVP Chat &ndash; tomorrow and day after

    - by Sahil Malik
    Ad:: SharePoint 2007 Training in .NET 3.5 technologies (more information). Yes we’re doing it again! After two very successful chats, a number of MVPs will be online in chat style answering your SharePoint questions. Here’s the schedule Tuesday May 25th at 4PM PDT (join here) Agnes Molnar Bill English Brian Farnhill Bryan Phillips Clayton Cobb David Mann <—ask him to tell a joke, he has a great sense of humor! Also bug him about Workflows. Matt McDermott Paul Stork Rob Bogue <—Ask him about WFs too. Rob Foster <— Him and Nick Swan run a SharePoint podcast. Sahil Malik <—I know him Saifullah Shafiq Ahmed   Wednesday at 9AM PDT (join here) Andrew Connell <— youngest MVP ever! LOL. Becky Bertram Bil Simser Chadima Kulathilake Claudio Brotto Gary Lapointe <—the stsadm extensions guy, ask him about powershell Darrin Bishop John Ross Michael Mukalian Muhanad Omar Randy Drisgill <—he created SP2010 starter master pages. Ask him about branding Shane Young Todd Bleeker Zlatan Dzinic Comment on the article ....

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  • Getting really weird entries in Apache log from Baidu.com?

    - by Undo
    I was looking through my server logs today, and I noticed this: (it's all one row) 118.244.179.250 - - [16/Oct/2013:20:59:25 +0000] "GET http://www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttphttp/www.baidu.comhttphttphttphttphttp/www.baidu.comhttphttphttphttp/www.baidu.comhttphttphttp/www.baidu.comhttphttp/www.baidu.comhttp/www.baidu.com/ HTTP/1.1" 301 4605 "http://www.baidu.com/" "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)" "GET http://www.baidu.comhttphttphttphttphttp...? Am I doing something wrong? Am I hosting someone else's website without knowing it? Is a guy named baidu trying to drive me crazy?

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  • Can I save & store a user's submission in a way that proves that the data has not been altered, and that the timestamp is accurate?

    - by jt0dd
    There are many situations where the validity of the timestamp attached to a certain post (submission of information) might be invaluable for the post owner's legal usage. I'm not looking for a service to achieve this, as requested in this great question, but rather a method for the achievement of such a service. For the legal (in most any law system) authentication of text content and its submission time, the owner of the content would need to prove: that the timestamp itself has not been altered and was accurate to begin with. that the text content linked to the timestamp had not been altered I'd like to know how to achieve this via programming (not a language-specific solution, but rather the methodology behind the solution). Can a timestamp be validated to being accurate to the time that the content was really submitted? Can data be stored in a form that it can be read, but not written to, in a proven way? In other words, can I save & store a user's submission in a way that proves that the data has not been altered, and that the timestamp is accurate? I can't think of any programming method that would make this possible, but I am not the most experienced programmer out there. Based on MidnightLightning's answer to the question I cited, this sort of thing is being done. Clarification: I'm looking for a method (hashing, encryption, etc) that would allow an average guy like me to achieve the desired effect through programming. I'm interested in this subject for the purpose of Defensive Publication. I'd like to learn a method that allows an every-day programmer to pick up his computer, write a program, pass information through it, and say: I created this text at this moment in time, and I can prove it. This means the information should be protected from the programmer who writes the code as well. Perhaps a 3rd party API would be required. I'm ok with that.

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  • How to Achieve OC4J RMI Load Balancing

    - by fip
    This is an old, Oracle SOA and OC4J 10G topic. In fact this is not even a SOA topic per se. Questions of RMI load balancing arise when you developed custom web applications accessing human tasks running off a remote SOA 10G cluster. Having returned from a customer who faced challenges with OC4J RMI load balancing, I felt there is still some confusions in the field how OC4J RMI load balancing work. Hence I decide to dust off an old tech note that I wrote a few years back and share it with the general public. Here is the tech note: Overview A typical use case in Oracle SOA is that you are building web based, custom human tasks UI that will interact with the task services housed in a remote BPEL 10G cluster. Or, in a more generic way, you are just building a web based application in Java that needs to interact with the EJBs in a remote OC4J cluster. In either case, you are talking to an OC4J cluster as RMI client. Then immediately you must ask yourself the following questions: 1. How do I make sure that the web application, as an RMI client, even distribute its load against all the nodes in the remote OC4J cluster? 2. How do I make sure that the web application, as an RMI client, is resilient to the node failures in the remote OC4J cluster, so that in the unlikely case when one of the remote OC4J nodes fail, my web application will continue to function? That is the topic of how to achieve load balancing with OC4J RMI client. Solutions You need to configure and code RMI load balancing in two places: 1. Provider URL can be specified with a comma separated list of URLs, so that the initial lookup will land to one of the available URLs. 2. Choose a proper value for the oracle.j2ee.rmi.loadBalance property, which, along side with the PROVIDER_URL property, is one of the JNDI properties passed to the JNDI lookup.(http://docs.oracle.com/cd/B31017_01/web.1013/b28958/rmi.htm#BABDGFBI) More details below: About the PROVIDER_URL The JNDI property java.name.provider.url's job is, when the client looks up for a new context at the very first time in the client session, to provide a list of RMI context The value of the JNDI property java.name.provider.url goes by the format of a single URL, or a comma separate list of URLs. A single URL. For example: opmn:ormi://host1:6003:oc4j_instance1/appName1 A comma separated list of multiple URLs. For examples:  opmn:ormi://host1:6003:oc4j_instanc1/appName, opmn:ormi://host2:6003:oc4j_instance1/appName, opmn:ormi://host3:6003:oc4j_instance1/appName When the client looks up for a new Context the very first time in the client session, it sends a query against the OPMN referenced by the provider URL. The OPMN host and port specifies the destination of such query, and the OC4J instance name and appName are actually the “where clause” of the query. When the PROVIDER URL reference a single OPMN server Let's consider the case when the provider url only reference a single OPMN server of the destination cluster. In this case, that single OPMN server receives the query and returns a list of the qualified Contexts from all OC4Js within the cluster, even though there is a single OPMN server in the provider URL. A context represent a particular starting point at a particular server for subsequent object lookup. For example, if the URL is opmn:ormi://host1:6003:oc4j_instance1/appName, then, OPMN will return the following contexts: appName on oc4j_instance1 on host1 appName on oc4j_instance1 on host2, appName on oc4j_instance1 on host3,  (provided that host1, host2, host3 are all in the same cluster) Please note that One OPMN will be sufficient to find the list of all contexts from the entire cluster that satisfy the JNDI lookup query. You can do an experiment by shutting down appName on host1, and observe that OPMN on host1 will still be able to return you appname on host2 and appName on host3. When the PROVIDER URL reference a comma separated list of multiple OPMN servers When the JNDI propery java.naming.provider.url references a comma separated list of multiple URLs, the lookup will return the exact same things as with the single OPMN server: a list of qualified Contexts from the cluster. The purpose of having multiple OPMN servers is to provide high availability in the initial context creation, such that if OPMN at host1 is unavailable, client will try the lookup via OPMN on host2, and so on. After the initial lookup returns and cache a list of contexts, the JNDI URL(s) are no longer used in the same client session. That explains why removing the 3rd URL from the list of JNDI URLs will not stop the client from getting the EJB on the 3rd server. About the oracle.j2ee.rmi.loadBalance Property After the client acquires the list of contexts, it will cache it at the client side as “list of available RMI contexts”.  This list includes all the servers in the destination cluster. This list will stay in the cache until the client session (JVM) ends. The RMI load balancing against the destination cluster is happening at the client side, as the client is switching between the members of the list. Whether and how often the client will fresh the Context from the list of Context is based on the value of the  oracle.j2ee.rmi.loadBalance. The documentation at http://docs.oracle.com/cd/B31017_01/web.1013/b28958/rmi.htm#BABDGFBI list all the available values for the oracle.j2ee.rmi.loadBalance. Value Description client If specified, the client interacts with the OC4J process that was initially chosen at the first lookup for the entire conversation. context Used for a Web client (servlet or JSP) that will access EJBs in a clustered OC4J environment. If specified, a new Context object for a randomly-selected OC4J instance will be returned each time InitialContext() is invoked. lookup Used for a standalone client that will access EJBs in a clustered OC4J environment. If specified, a new Context object for a randomly-selected OC4J instance will be created each time the client calls Context.lookup(). Please note the regardless of the setting of oracle.j2ee.rmi.loadBalance property, the “refresh” only occurs at the client. The client can only choose from the "list of available context" that was returned and cached from the very first lookup. That is, the client will merely get a new Context object from the “list of available RMI contexts” from the cache at the client side. The client will NOT go to the OPMN server again to get the list. That also implies that if you are adding a node to the server cluster AFTER the client’s initial lookup, the client would not know it because neither the server nor the client will initiate a refresh of the “list of available servers” to reflect the new node. About High Availability (i.e. Resilience Against Node Failure of Remote OC4J Cluster) What we have discussed above is about load balancing. Let's also discuss high availability. This is how the High Availability works in RMI: when the client use the context but get an exception such as socket is closed, it knows that the server referenced by that Context is problematic and will try to get another unused Context from the “list of available contexts”. Again, this list is the list that was returned and cached at the very first lookup in the entire client session.

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  • What causes bad performance in consumer apps?

    - by Crashworks
    My Comcast DVR takes at least three seconds to respond to every remote control keypress, making the simple task of watching television into a frustrating button-mashing experience. My iPhone takes at least fifteen seconds to display text messages and crashes ¼ of the times I try to bring up the iPad app; simply receiving and reading an email often takes well over a minute. Even the navcom in my car has mushy and unresponsive controls, often swallowing successive inputs if I make them less than a few seconds apart. These are all fixed-hardware end-consumer appliances for which usability should be paramount, and yet they all fail at basic responsiveness and latency. Their software is just too slow. What's behind this? Is it a technical problem, or a social one? Who or what is responsible? Is it because these were all written in managed, garbage-collected languages rather than native code? Is it the individual programmers who wrote the software for these devices? In all of these cases the app developers knew exactly what hardware platform they were targeting and what its capabilities were; did they not take it into account? Is it the guy who goes around repeating "optimization is the root of all evil," did he lead them astray? Was it a mentality of "oh it's just an additional 100ms" each time until all those milliseconds add up to minutes? Is it my fault, for having bought these products in the first place? This is a subjective question, with no single answer, but I'm often frustrated to see so many answers here saying "oh, don't worry about code speed, performance doesn't matter" when clearly at some point it does matter for the end-user who gets stuck with a slow, unresponsive, awful experience. So, at what point did things go wrong for these products? What can we as programmers do to avoid inflicting this pain on our own customers?

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  • Amazon how does their remarkable search work?

    - by JonH
    We are working on a fairly large CRM system /knowledge management system in asp.net. The db is SQL server and is growing in size based on all the various relationships. Upper management keeps asking us to implement search much like amazon does. Right from there search you can specify to search certain objects like outdoor equipment, clothing, etc. and you can even select all. I keep mentioning to upper management that we need to define the various fields to search on. Their response is all fields...they probably look at the search and assume that it is so simple. I'm the guy who has to say hold on guys we are talking about amazon here. My question is how can amazon run a search on an "all" category. Also one of the things management here likes is the dynamic filters. For instance, searching robot brings up filters specific to a robot toy. How can I put management in check and at least come up with search functionality that works like amazon. We are using asp.net, SQL server 2008 and jquery.

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  • Rock Stars and now OPN All-Stars? Bring it.

    - by sandra.haan
    We are talking everything OPN All-Star - from home-court advantage to taking too many shots across a wide variety of industries, skill sets, focus areas, broad solution sets, applications and technologies. As a Platinum Partner, Intelenex levels of quality specialization range from ERP/EBS, CRM, AIA to Hyperion. Slam dunk! This is what gives Intelenex a well deserved star studded "baller" celebrity status like the LA Lakers very own Kobe Bryant. While Intelenex has been busy multi-specializing and taking names, Tyler Prince, group vp, North America Sales tells us a little bit about the value OPN's overall strategy brings to the table. This exclusive partnership allows OPN Specialized partners to provide customers with a solution that helps them adapt swiftly to new expansion conditions and changes. Namely, partners can pick an area to focus and can leverage that focus and competency to differentiate from the competition. You will be so HOT on the OPN court the Miami Heat will have nothing on you. Watch out, Lebron. Additionally, this specialization in products or set of products is recognized by the entire Oracle sales force, which is vital to all partners, but most importantly your end-customers. You will be so stylishly famous your cheerleader squad will not be able to steal the spotlight from you. Are you really All-Star worthy this season? Jump in and join Tyler's halftime report on OPN's All-Star program in this VAR Guy FastChat video to find out: Now that's what we call some March Madness - Good selling, The OPN Communications Team

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  • HTML5 game engine for a 2D or 2.5D RPG style "map walk"

    - by stargazer
    please help me to choose a HTML5 game engine or Javascript libraries I want to do the following in the game: when the game starts a part the huge map (full size of the map: about 7 screens) is shown. The map itself is completely designed in the editor mapeditor.org (or in some comparable editor - if you know a good alternative to mapeditor.org - let me know) and loaded at runtime or at design time. The game engine should support loading of isometric maps (well, in worst case only orthogonal maps will be sufficient) both "tile layer" and "object layer" from mapeditor.org should be supported. Scrolling/performance of this map should be fast enough. The map and the game should be either in 2D (orthogonal map) or in 2.5D (isometric map) The game engine should support movement of sprites with animation. Let say I have a sprite for "human" with animation sequences showing "walking" in 8 directions - it should be imported into game engine and should "walk" on the map without writing a lot of Javascript code. Automatic scrolling of the map the "human" nears the screen border. Collision detection, "solid" objects. The mapeditor.org supports properies on tiles. Let say I assign a "solid" property to some tiles in editor. It should be easy to check this "solid" property in the game engine and implement kind of "solid" behavior, so the animanted sprites do not walk through the walls. Collision detection - it should be easy to implement some custom functionality like "when sprite A is close to sprite B - call this function" Showing "dialogs" or popup windows on top of the map - should be easy to implement. Cross-browser audio support - (it is implemented quite well in construct 2 from scirra, so I'm looking for the comparable audio quality) The game itself is a king of RPG but without fighting scenes and without huge "inventory". The main character just walking on the map, discovers some things, there are dialogs and sounds. The functionality of this example from sprite.js http://batiste.dosimple.ch/sprite.js/tests/mapeditor/map_reader.html is very close to what I'm developing. But I'm not a Javascript guru (and a very lazy guy) and would like to write even less Javascript code as in the example...

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