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• Mouse doesn't work & internet connection not made in Ubuntu 12.04 LTS

  - by David Skare

  Yesterday, Nov 15, 2012, I booted into my Ubuntu 12.04 LTS system. It has resided on a Crucial 128 GB SSD with about 90% free space since early summer. I also have Windows 7 loaded on another Crucial 256 GB SSD. Ubuntu has set up a dual boot system for me even though each OS has its own SSD. I have been using this setup without problems since summer. Yesterday, when the boot process finished, my Microsoft Comfort Mouse 3000 did not work and there was a message that Ubuntu was not connected to the internet. So w/o the mouse I was forced to turn the machine off manually. About 4 days ago Ubuntu worked fine and booting into Win 7 also works fine. I have a backup machine with the same style mouse on it so I swapped the mouse onto this system. Same results. But both mice work when booting into Win 7. Today I removed both SSDs and installed my Ubuntu 12.04 HD which has not been used since I moved Ubuntu to the SSD from it. Same results. Between the last time I used Ubuntu 12.04 on the SSD and when I tried to use it again I made no changes to my machine, either hardware or software. My machines specs are: AMD FX-6100, MSI 990FXA-GD65 AM3+ format with latest BIOS (Ver 19.9), Corsair Vengeance 1866 MHz memory - 16 GB (4GB X 4 sticks), MSI N580GTX video card (nVidia 306.97 drivers), Sony Bravia 32" HD TV as a monitor, Pioneer BluRay DVD-RW, DSL connection to internet thru a router (10 mps), Crucial 128 GB SSD (90% free space), Microsoft Comfort Mouse 3000 I try to maintain current BIOS and drivers for all devices. I mostly use my Ubuntu system for programming in GCC and OpenCOBOL, surfing the internet and e-mailing. No games are installed. I'm stumped! If anyone has experienced this same problem I'd appreciate knowing how you solved it. TIA, Dave

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• Suggested Resources Visual Studio Plug-In

  Todays post is a quick plug for a new tool developed by my friend Olaf Conijn, who (amongst other things) has been a developer on several versions of Enterprise Library. His new tool is called Suggested Resources for .NET Developers, and the current 0.8 release works with both Visual Studio 2008 and Visual Studio 2010. So what does it do? Well heres what Olaf has to say: This Visual Studio Integration Package is a proof of concept in: Aggregation of online content within the Visual Studio IDE. Analysis of development activities within the Visual Studio IDE. This combination of features allows Suggested Resources for .NET developers to pro-actively suggest online content that applies on the task being performed by a developer... A bit like having a programming pair that searches for online resources while you focus on getting the job done. For more info, screenshots and downloads, head to the Codeplex project site or the Visual Studio Gallery page.Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• ArchBeat Link-o-Rama Top 20 for June 3-9, 2012

  - by Bob Rhubart

  The top twenty most popular links as shared via my social networks for the week of June 3-9, 2012. SOA Analysis within the Department of Defense Architecture Framework (DoDAF) 2.0 – Part II | Dawit Lessanu Driving from Business Architecture to Business Process Services | H. V. Ganesarethinam Book Review: Oracle Application Integration Architecture (AIA) Foundation Pack 11gR1: Essentials | Rajesh Raheja Oracle Enterprise Manager Ops Center 12c: Enterprise Controller High Availability (EC HA)| Anand Akela Integrating OBIEE 11g into Weblogic’s SAML SSO | Andre Correa Introducing Decision Tables in the SOA Suite 11g Business Rule component | Lucas Jellema EJB 3.1: Stateless Session Bean Deployed as .war, Dependency Injection, Asynchronous Methods | Frank Munz Educause Top-Ten IT Issues - the most change in a decade or more | Cole Clark Oracle VM RAC template - what it took | Wim Coekaerts WebCenter Content shared folders for clustering | Kyle Hatlestad CRUD Use Case Implementation and ADF Query Search | @AndrejusB Introducing Oracle Cloud | Larry Ellison Exalogic Webcast Series: Rethink Your Business Application Deployment Strategy BI Architecture Master Class for Partners - Oracle Architecture Unplugged Creating an Oracle Endeca Information Discovery 2.3 Application | Mark Rittman Eclipse DemoCamp - June 2012 - Redwood Shores, CA Oracle Cloud offering - What makes it unique? | Tom Laszewski Virtualization at Oracle - Six Part Series The right way to transform your business via the cloud | David Linthicum Protecting a WebCenter app with OAM 11g | Chris Johnson Thought for the Day "Programming without an overall architecture or design in mind is like exploring a cave with only a flashlight: You don't know where you've been, you don't know where you're going, and you don't know quite where you are." — Danny Thorpe Source: softwarequotes.com

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• Graduate expectations versus reality

  - by Bobby Tables

  When choosing what we want to study, and do with our careers and lives, we all have some expectations of what it is going to be like. Now that I've been in the industry for almost a decade, I've been reflecting a bit on what I thought (back when I was studying Computer Science) programming working life was going to be like, and how it's actually turning out to be. My two biggest shocks (or should I say, broken expectations) by far are the sheer amount of maintenance work involved in software, and the overall lack of professionalism: Maintenance: At uni, we were all told that the majority of software work is maintenance of existing systems. So I knew to expect this in the abstract. But I never imagined exactly how overwhelming this would turn out to be. Perhaps it's something I mentally glazed over, and hoped I'd be building cool new stuff from scratch a lot more. But it really is the case that most jobs are overwhelmingly maintenance, bug fixing, and support oriented. Lack of professionalism: At uni, I always had the impression that commercial software work is very process-oriented and stringently engineered. I had images of ISO processes, reams of technical documentation, every feature and bug being strictly documented, and a generally professional environment. It came as a huge shock to realise that most software companies operate no differently to a team of students working on a large semester-long project. And I've worked in both the small agile hack shop, and the medium sized corporate enterprise. While I wouldn't say that it's always been outright "unprofessional", it definitely feels like the software industry (on the whole) is far from the strong engineering discipline that I expected it to be. Has anyone else had similar experiences to this? What are the ways in which your expectations of what our profession would be like were different to the reality?

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• How to loop section from a song correctly?

  - by Teflo

  I'm programming a little Music Engine for my game in C# and XNA, and one aspect from it is the possibility to loop a section from a song. For example, my song has an intropart, and when the song reached the end ( or any other specific point ), it jumps back where the intropart is just over. ( A - B - B - B ... ) Now I'm using IrrKlank, which is working perfectly, without any gaps, but I have a problem: The point where to jump back is a bit inaccurate. Here's some example code: public bool Passed(float time) { if ( PlayPosition >= time ) return true; return false; } //somewhere else if( song.Passed( 10.0f ) ) song.JumpTo( 5.0f ); Now the problem is, the song passes the 10 seconds, but play a few milliseconds until 10.1f or so, and then jumps to 5 seconds. It's not that dramatic, but very incorrect for my needs. I tried to fix it like that: public bool Passed( float time ) { if( PlayPosition + 3 * dt >= time && PlayPosition <= time ) return true; return false; } ( dt is the delta time, the elapsed time since the last frame ) But I don't think, that's a good solution for that. I hope, you can understand my problem ( and my english, yay /o/ ) and help me :)

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• Is micro-optimisation important when coding?

  - by BozKay

  I recently asked a question on stackoverflow.com to find out why isset() was faster than strlen() in php. This raised questions around the importance of readable code and whether performance improvements of micro-seconds in code were worth even considering. My father is a retired programmer, I showed him the responses and he was absolutely certain that if a coder does not consider performance in their code even at the micro level, they are not good programmers. I'm not so sure - perhaps the increase in computing power means we no longer have to consider these kind of micro-performance improvements? Perhaps this kind of considering is up to the people who write the actual language code? (of php in the above case). The environmental factors could be important - the internet consumes 10% of the worlds energy, I wonder how wasteful a few micro-seconds of code is when replicated trillions of times on millions of websites? I'd like to know answers preferably based on facts about programming. Is micro-optimisation important when coding? EDIT : My personal summary of 25 answers, thanks to all. Sometimes we need to really worry about micro-optimisations, but only in very rare circumstances. Reliability and readability are far more important in the majority of cases. However, considering micro-optimisation from time to time doesn't hurt. A basic understanding can help us not to make obvious bad choices when coding such as if (expensiveFunction() && counter < X) Should be if (counter < X && expensiveFunction()) (example from @zidarsk8) This could be an inexpensive function and therefore changing the code would be micro-optimisation. But, with a basic understanding, you would not have to because you would write it correctly in the first place.

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• Exklusiv für Oracle Academy-Teilnehmer und nur bis 15. Juli 2011: bis zu 68% Preisnachlass auf Self-Study-Kurse

  - by bwolf

  Kennen Sie schon unsere Oracle University-Produkte zum eigenständigen Lernen? Oracle University bieten Ihnen eine große Auswahl von individuellen Kursen verfügbar als Self-Study CDs an. Diese Kurse sind zu 100 % angelehnt an unsere Klassenraumkurse oder beinhalten spezifische und individuelle Schwerpunkte. Die CDs der Oracle University werden jederzeit auf den neuesten IT Standards konzipiert und sind genau auf die Bedürfnisse unserer Kunden zugeschnitten. Ihre Vorteile:  Durch unser einmaliges Angebot der Self-Study CDs können Sie...: ...Ihr bereits vorhandenes Wissen vertiefen oder erweitern ...als individuelles Nachschlagewerk Ihr Know-How immer auf dem neusten Stand halten ...unsere Self-Study CDs unbegrenzt zeitlich nutzen ...jederzeit die Inhalte nochmal nachschlagen und vertiefen ...neue Mitarbeiter einfach einarbeiten ...Reisekosten zu 100% vermeiden ...und können jederzeit zeitlich flexibel sein. Folgende attraktive Preiskonditionen bieten wir exklusiv nur für Oracle Academy-Teilnehmer an. Sie erhalten schon ab der  1. Self-Study CD 58 % Preisnachlass Sie erhalten ab der 11. Self-Study CD 63 % PreisnachlassS Sie erhalten ab der 21. Self-Study CD 68 % PreisnachlassS So erhalten Sie z.B. unseren Self-Study-Kurs Fundamentals of the Java Programming Language, Java SE 6, schon für 218,82 € zzgl. MwSt Die komplette Liste verfügbarer Self-Study-Kurse finden Sie hier Wichtig: Das Angebot ist nur bis zum 15. Juli 2011 gültig! Da das Angebot NICHT bei Online-Buchungen gilt, kontaktieren Sie bitte unsere Kollegin Nele Mletschkowsky (Tel. kostenfrei 0800-1862336).

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• A new mission statement for my school's algorithms class

  - by Eric Fode

  The teacher at Eastern Washington University that is now teaching the algorithms course is new to eastern and as a result the course has changed drastically mostly in the right direction. That being said I feel that the class could use a more specific, and industry oriented (since that is where most students will go, though suggestions for an academia oriented class are also welcome) direction, having only worked in industry for 2 years I would like the community's (a wider and much more collectively experienced and in the end plausibly more credible) opinion on the quality of this as a statement for the purpose an algorithms class, and if I am completely off target your suggestion for the purpose of a required Jr. level Algorithms class that is standalone (so no other classes focusing specifically on algorithms are required). The statement is as follows: The purpose of the algorithms class is to do three things: Primarily, to teach how to learn, do basic analysis, and implement a given algorithm found outside of the class. Secondly, to teach the student how to model a problem in their mind so that they can find a an existing algorithm or have a direction to start the development of a new algorithm. Third, to overview a variety of algorithms that exist and to deeply understand and analyze one algorithm in each of the basic algorithmic design strategies: Divide and Conquer, Reduce and Conquer, Transform and Conquer, Greedy, Brute Force, Iterative Improvement and Dynamic Programming. The Question in short is: do you agree with this statement of the purpose of an algorithms course, so that it would be useful in the real world, if not what would you suggest?

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• Hosting several HTTP servers on single domain name

  - by Nakilon

  Several people have got a single domain name server.company.com server, where they are now supposed to host their infrastructure or temporal projects, written in different ways even in different programming languages. How do they divide the domain? Split into subdomains: john.server.company.com, kate.server.company.com, etc. This would need a lot of admins' assistance, time, etc. -- there would be no way for John and Kate to do it themselves. Split into url namespaces: server.company.com/john/, server.company.com/kate/, etc. Pro: They now can make a single welcome page at root with any additional info (if they need?) Con: Each server would need to know their namespace string constant, and hrefs like / whould need patching. Split into ports: server.company.com:8080, server.company.com:8081, etc. and make a single :80 welcome page. Pro: They still can make a single welcome page at :80 Con: ??? I would like to know more pros and cons for 2 and 3 solution.

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• How can I call a URL as a cron job in Webmin?

  - by EmmyS

  (Possibly this belongs on stackoverflow, although it's not really a programming issue since the code works when run directly. If it needs to be moved, though, no problem.) I have a PHP file (which consumers a National Weather Service web service via SOAP, if it matters) that I need to run on a scheduled basis. I'm trying to set up a cron job in Webmin. If I use an absolute path to the file in the Command field, when I run it I get some strange errors: /var/www/html/mysite.com/test/ndfdXMLclient.php: line 1: ?php: No such file or directory /var/www/html/mysite.com/test/ndfdXMLclient.php: line 2: //: is a directory /var/www/html/mysite.com/test/ndfdXMLclient.php: line 3: //DOCUMENTATION: No such file or directory /var/www/html/mysite.com/test/ndfdXMLclient.php: line 4: //: is a directory /var/www/html/mysite.com/test/ndfdXMLclient.php: line 5: syntax error near unexpected token `"running client code",' /var/www/html/mysite.com/test/ndfdXMLclient.php: line 5: `error_log("running client code", 1, "[email protected]");' The actual code in my file for those 5 lines looks like this: <?php // *************************************************************************** //DOCUMENTATION FROM WEATHER.GOV ALL STORED IN xmlClientComments.txt // *************************************************************************** error_log("running client code", 1, "[email protected]"); The code runs perfectly fine when I run it directly in my browser, so why doesn't webmin recognize it as code? (The same thing happens if I enter the actual URL in the command field - http://mysite.com/test/ndfdXMLclient.php.) I've never worked with webmin before; most of our hosts' cron control panels allow cron jobs to run PHP files like this with no issue. Is there some trick to getting webmin to read php as actual php?

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• Thanks All the readers and community and Happy new year to all of you.

  - by Jalpesh P. Vadgama

  This is my first blog post for new year 2011 and I would like to take this opportunity to thank all the readers for making my blog very successful and accepting me a community member. As year 2010 has lots of up down in IT filed it was recession period and now we almost recovered from it. Personally year 2010 has been very successful to me as I have been awarded as Microsoft Most Valuable Professional for visual C#. And It was one of the greatest achievement of my life. I would like to take this opportunity to thanks Microsoft for this and thanks all friends specially Jacob Sebastian who has given me guidance any time I required it. I have been also awarded dzone most valuable blogger this year and it was a nice surprise from dzone. I would like thanks dzone for this. Once again I am wishing you happy new year and may this year will bring success to all of you. One more thing I have found that I have met lots of people who is quite intelligent and exceptional developers and IT professionals but they are not blogging their stuff. I would say please my blog post a why a developer should write blog and Start blogging immediately because unless and until you don’t blog community will not know what you are doing.  Till then happy blogging and programming ... Stay tuned for more..

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• Delphi Client-Server Application using Firebird 2.5 error

  - by Japie Bosman

  I have got a lengthy question to ask. First of all Im still very new when it comes to Delphi programming and my experience has beem mostly developing small single user database applications using ADO and an Access database. I need to take the transition now to a client server application and this is where the problem starts. I decided to use Firebird 2.5 embeded as my database, as it is open source, and it is can be used with the interbase components in Delphi and that multiple clients can access the database simultanously. So I followed the interbase tutorial in Delphi. I managed to connect the client to the server and see the data in the example (While both are running on my pc), but when i tried to move the client to another pc, keeping the server on mine and running it to see if I can connect to the server it gave me the following error. Exception EIdSocketError in module clientDemo.exe at 0029DCAC. Socket Error # 10061 Connection refused. I understand that this might be because the host is defined as localhost in the client. But here is my first question. In the TSQLConncetion you can set die hostname under Driver-Hostname. The thing I want to know is how do you do this at run time, as I cannot get the property when I try and make an edit box to allow the user to enter the value and then set it via code like for example: SQLConncetion1.Driver.Hostname := edtHost.text; The thing is there is not such property to set, so how do you set the hostname at run time? Im using Delphi XE2 There is still a lot of questions to come especially when it comes to deployment, but I will take this piece by piece and I appreciate the advice.

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• What stops HTML5 and JS apps to perform as good as native apps?

  - by Amogh Talpallikar

  From what I understand, HTML is a mark-up language, so is the content of XAML, XIB and whatever Android uses and other native UI development frameworks. JavaScript is a programming language used along with it to handle client side scripting which will include things like event handling, client side validations and anything else C#,Java,Objective-C or C++ do in various such frameworks. There are MVC/MVVM patterns available in form frameworks like Sencha's, Angular etc. We have localStorage in form of both sqlite and key-value store as other frameworks have and you have API specification for almost everything that it missing. Whenever a native UI frameworks has to render UI , it has to parse a similar the markup and render the UI. Question break-down What stops from doing the same in HTML and JS itself ? Instead of having a web-control or browser as a layer in between why can't HTML(along with CSS) and JS be made to perform the same way ? Even if there is a layer,so does .net runtime and JVM are in other cases where C++,C are not being used. So Lets take the case of Android, like Dalvik, why Can't Chromium be another option(along with dalvik and NDK) where HTML does what android markup does and JavaScript is used to do what Java does ? So the Question is, Even if current implementations aren't as good, but theoretically is it possible to get HTML5 based applications to work as other native apps specially on mobile ?

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• Overwhelmed by complex C#/ASP.NET project in Visual Studio 2008

  - by Darren Cook

  I have been hired as a junior programmer to work on projects that extend existing functionality in a very large, complex solution. The code base consists of C#, ASP.NET, jQuery, javascript, html and xml. I have some knowledge of all these in addition to fair knowledge of object-oriented programming and its fundamental concepts of inheritance, abstraction, polymorphism and encapsulation. I can follow code up through its base classes, interfaces, abstract classes and understand a large part of the code that I read while doing this. However, this solution is so humongous and so many things get tied together whenever I navigate through the code that I feel absolutely overwhelmed. I often find myself unable to fully follow everything that is going on with objects being serialized, large amounts of C# and javascript operating on the same pages and methods being called from template files that consist mainly of markup. I love learning about code, but trying to deal with this really stresses me out. Additionally, I do know that a significant amount of unit testing has been done but I know nothing about unit testing or how to utilize it. Any advice anyone could offer me regarding dealing with a large code base while using Visual Studio 2008 would be greatly appreciated. Are there tools that I can use to help get a handle on what is going on? Perhaps there are things even in Visual Studio that I am not aware of. How can I follow the code to low level functionality in order to get a better grasp of what is going on at a high level?

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• SOA Forcing A Shift In IT Governance

  As more and more companies adopt a service oriented approach to developing and maintaining existing enterprise systems, IT governance also needs to shift its philosophies to fit the emerging development paradigm. When I first started programming companies placed an emphasis on “Code and Go” software development style. They only developed for current problems and did not really take a look at how the company could leverage some of the code we were developing across the entire enterprise system.  The concept of Service Oriented Architecture (SOA) has dramatically shifted how we develop enterprise software with emphasizing software processes as company assets. This has driven some to start developing new components as processes strictly for the possibility of future integration of existing and new systems. I personally like this new paradigm because it truly promotes code reusability. However, most enterprise level IT governance polices were created prior to the introduction of SOA in their respected organization. This can create a sense of the Wild West for developers working on projects related to SOA. This is due to the fact that a lot of the standards and polices implemented by enterprise IT governing boards were initially for developing under the “Code and Go” paradigm and do not take in to account idiosyncrasies found in the SOA/integration based development. As IT governance moves forward its focus should aim more for “Develop to Integrate” versus “Code and Go” philosophies. Examples of “Develop to Integrate” Philosophy: Defining preferred data transfer methodologies (XML vs. JSON), and when to use them Updating security best practices for exposing public services based on existing standard security policies Define when to use create new SOA project vs. implementing localized components that could be reused elsewhere in the enterprise.

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• Music While Coding [closed]

  - by inspectorG4dget

  Hi SO, Generally, while I'm coding, I prefer to listen to some background music. Nothing that'll get me distracted, but something that'll help keep the rhythm and isn't counterproductive when I need to stop coding to debug or to think of a way to solve a small problem that stands in the way of progress. Now, I have read some similar questions on reddit and on SO - specifically: which songs do you find most productive to listen to while coding, Music while programming and more. Sadly a lot of these questions were closed as off-topic, etc. But (1) I don't think this question is off-topic and I think that a lot of programmers can benefit from it. (2) It's a real question. I really want to know what music you guys would recommend because music helps when I'm coding. It's sad that SO: Music to listen to while coding cannot be found and this isn't of much help. I hope this doesn't get closed. PS: I want to turn this into a community wiki, but I don't seem to know how. I'd appreciate any help. Thank you, all. In response to kirk.burleson's comment: In case the question isn't already clear, I'm asking for recommendations/opinions of music to listen to while coding. I would like to know what you listen to when you code so that I can try it too. I am running out of good "coding music" and this is a problem for me because good "coding music" helps me code better.

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• Starting to Program C++ and Java

  - by user0321

  So as the title states, I'm trying to start programming in C++ and Java. I took C++ and Java courses in high school and I'm trying to get back into it. Of course all I want to get working now is a simple "Hello World" program. Couple of things: I want to use an IDE. I've decided on Eclipse. I'm just confused about how I go about downloading/using it. For Java: I get stuck right on their download page. They show Eclipse Classic, Eclipse IDE for Java developers and Eclipse IDE for Java EE Developers. I only programmed in Notepad and compiled in command prompt. Question 1: Which version of Eclipse should I download? Question 2: Do I need to install the Java JDK or does it come built into Eclipse? For C++: I guess I download the separate Eclipse IDE for C/C++ developers? I'm not too sure. I remember using Microsoft Visual for C++. I remember it being weird though. Anyways Question 3: Which version of Eclipse should I download? Question 4: Does C++ have a Development Kit or does it come built into Eclipse?

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• Windows Azure Interop

  - by kaleidoscope

  How Windows Azure Platform is an open cloud platform. What makes it interoperable? The Windows Azure platform supports popular standards and protocols including SOAP, REST, and XML. Developers can use their preferred programming frameworks including .NET, and PHP, now. Tools such as Eclipse have been created for PHP developers for building Windows Azure applications. Now external endpoints (inbound traffic) have been enabled to worker a role, which enables applications that receive internet traffic that aren’t running under IIS. Windows Azure interoperable with Java At PDC 09, solution accelerator for Tomcat is delivered. Tomcat is an open source software implementation of the Java Servlet and JavaServer Pages technologies. The Windows Azure solution accelerator leverages a PDC09 feature that enable arbitrary processes to bind to inbound service endpoints. Windows Azure interoperable with PHP The Windows Azure tools for Eclipse extension builds upon the PHP Development Toolkit (PDT) and integrates Web Tools Platform (WTP) to provide a complete toolkit for Windows Azure web application development. For more details please refer to the link: http://www.microsoft.com/windowsazure/faq/   Rituraj

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• Register now for the UK Windows Azure Self-paced Interactive Learning Course starting May 10th

  - by Eric Nelson

  [Suggested twitter tag #selfpacedazure] We (myself and David Gristwood) have been working in the UK to create a fantastic opportunity to get yourself up to speed on the Windows Azure Platform over a 6 week period starting May 10th – without ever needing to leave the comfort of your home/office.  The course is derived from the internal training Microsoft gives on Azure which is both fun and challenging in equal parts – and we felt was just too good to keep to ourselves! We will be releasing more details nearer the date but hopefully the following is enough to convince you to register and … recommend it to a colleague or three :-) What we have produced is the “Microsoft Azure Self-paced Learning Course”. This is a free, interactive, self-paced, technical training course covering the Windows Azure platform – Windows Azure, SQL Azure and the Azure AppFabric. The course takes place over a six week period finishing on June 18th. During the course you will work from your own home or workplace, and get involved via interactive Live Meetings session, watch on-line videos, work through hands-on labs and research and complete weekly coursework assignments. The mentors and other attendees on the course will help you in your research and learning, and there are weekly Live Meetings where you can raise questions and interact with them. This is a technical course, aimed at programmers, system designers, and architects who want a solid understanding of the Microsoft Windows Azure platform, hence a prerequisite for this course is at least six months programming in the .NET framework and Visual Studio. Check out the full details of the event or go straight to registration.   The course outline is: Week 1 - Windows Azure Platform Week 2 - Windows Azure Storage Week 3 - Windows Azure Deep Dive and Codename "Dallas" Week 4 - SQL Azure Week 5 - Windows Azure Platform AppFabric Access Control Week 6 - Windows Azure Platform AppFabric Service Bus If you have any questions about the course and its suitability, please email [email protected].

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• Changes to the LINQ-to-StreamInsight Dialect

  - by Roman Schindlauer

  In previous versions of StreamInsight (1.0 through 2.0), CepStream<> represents temporal streams of many varieties: Streams with ‘open’ inputs (e.g., those defined and composed over CepStream<T>.Create(string streamName) Streams with ‘partially bound’ inputs (e.g., those defined and composed over CepStream<T>.Create(Type adapterFactory, …)) Streams with fully bound inputs (e.g., those defined and composed over To*Stream – sequences or DQC) The stream may be embedded (where Server.Create is used) The stream may be remote (where Server.Connect is used) When adding support for new programming primitives in StreamInsight 2.1, we faced a choice: Add a fourth variety (use CepStream<> to represent streams that are bound the new programming model constructs), or introduce a separate type that represents temporal streams in the new user model. We opted for the latter. Introducing a new type has the effect of reducing the number of (confusing) runtime failures due to inappropriate uses of CepStream<> instances in the incorrect context. The new types are: IStreamable<>, which logically represents a temporal stream. IQStreamable<> : IStreamable<>, which represents a queryable temporal stream. Its relationship to IStreamable<> is analogous to the relationship of IQueryable<> to IEnumerable<>. The developer can compose temporal queries over remote stream sources using this type. The syntax of temporal queries composed over IQStreamable<> is mostly consistent with the syntax of our existing CepStream<>-based LINQ provider. However, we have taken the opportunity to refine certain aspects of the language surface. Differences are outlined below. Because 2.1 introduces new types to represent temporal queries, the changes outlined in this post do no impact existing StreamInsight applications using the existing types! SelectMany StreamInsight does not support the SelectMany operator in its usual form (which is analogous to SQL’s “CROSS APPLY” operator): static IEnumerable<R> SelectMany<T, R>(this IEnumerable<T> source, Func<T, IEnumerable<R>> collectionSelector) It instead uses SelectMany as a convenient syntactic representation of an inner join. The parameter to the selector function is thus unavailable. Because the parameter isn’t supported, its type in StreamInsight 1.0 – 2.0 wasn’t carefully scrutinized. Unfortunately, the type chosen for the parameter is nonsensical to LINQ programmers: static CepStream<R> SelectMany<T, R>(this CepStream<T> source, Expression<Func<CepStream<T>, CepStream<R>>> streamSelector) Using Unit as the type for the parameter accurately reflects the StreamInsight’s capabilities: static IQStreamable<R> SelectMany<T, R>(this IQStreamable<T> source, Expression<Func<Unit, IQStreamable<R>>> streamSelector) For queries that succeed – that is, queries that do not reference the stream selector parameter – there is no difference between the code written for the two overloads: from x in xs from y in ys select f(x, y) Top-K The Take operator used in StreamInsight causes confusion for LINQ programmers because it is applied to the (unbounded) stream rather than the (bounded) window, suggesting that the query as a whole will return k rows: (from win in xs.SnapshotWindow() from x in win orderby x.A select x.B).Take(k) The use of SelectMany is also unfortunate in this context because it implies the availability of the window parameter within the remainder of the comprehension. The following compiles but fails at runtime: (from win in xs.SnapshotWindow() from x in win orderby x.A select win).Take(k) The Take operator in 2.1 is applied to the window rather than the stream: Before After (from win in xs.SnapshotWindow() from x in win orderby x.A select x.B).Take(k) from win in xs.SnapshotWindow() from b in     (from x in win     orderby x.A     select x.B).Take(k) select b Multicast We are introducing an explicit multicast operator in order to preserve expression identity, which is important given the semantics about moving code to and from StreamInsight. This also better matches existing LINQ dialects, such as Reactive. This pattern enables expressing multicasting in two ways: Implicit Explicit var ys = from x in xs          where x.A > 1          select x; var zs = from y1 in ys          from y2 in ys.ShiftEventTime(_ => TimeSpan.FromSeconds(1))          select y1 + y2; var ys = from x in xs          where x.A > 1          select x; var zs = ys.Multicast(ys1 =>     from y1 in ys1     from y2 in ys1.ShiftEventTime(_ => TimeSpan.FromSeconds(1))     select y1 + y2; Notice the product translates an expression using implicit multicast into an expression using the explicit multicast operator. The user does not see this translation. Default window policies Only default window policies are supported in the new surface. Other policies can be simulated by using AlterEventLifetime. Before After xs.SnapshotWindow(     WindowInputPolicy.ClipToWindow,     SnapshotWindowInputPolicy.Clip) xs.SnapshotWindow() xs.TumblingWindow(     TimeSpan.FromSeconds(1),     HoppingWindowOutputPolicy.PointAlignToWindowEnd) xs.TumblingWindow(     TimeSpan.FromSeconds(1)) xs.TumblingWindow(     TimeSpan.FromSeconds(1),     HoppingWindowOutputPolicy.ClipToWindowEnd) Not supported … LeftAntiJoin Representation of LASJ as a correlated sub-query in the LINQ surface is problematic as the StreamInsight engine does not support correlated sub-queries (see discussion of SelectMany). The current syntax requires the introduction of an otherwise unsupported ‘IsEmpty()’ operator. As a result, the pattern is not discoverable and implies capabilities not present in the server. The direct representation of LASJ is used instead: Before After from x in xs where     (from y in ys     where x.A > y.B     select y).IsEmpty() select x xs.LeftAntiJoin(ys, (x, y) => x.A > y.B) from x in xs where     (from y in ys     where x.A == y.B     select y).IsEmpty() select x xs.LeftAntiJoin(ys, x => x.A, y => y.B) ApplyWithUnion The ApplyWithUnion methods have been deprecated since their signatures are redundant given the standard SelectMany overloads: Before After xs.GroupBy(x => x.A).ApplyWithUnion(gs => from win in gs.SnapshotWindow() select win.Count()) xs.GroupBy(x => x.A).SelectMany(     gs =>     from win in gs.SnapshotWindow()     select win.Count()) xs.GroupBy(x => x.A).ApplyWithUnion(gs => from win in gs.SnapshotWindow() select win.Count(), r => new { r.Key, Count = r.Payload }) from x in xs group x by x.A into gs from win in gs.SnapshotWindow() select new { gs.Key, Count = win.Count() } Alternate UDO syntax The representation of UDOs in the StreamInsight LINQ dialect confuses cardinalities. Based on the semantics of user-defined operators in StreamInsight, one would expect to construct queries in the following form: from win in xs.SnapshotWindow() from y in MyUdo(win) select y Instead, the UDO proxy method is referenced within a projection, and the (many) results returned by the user code are automatically flattened into a stream: from win in xs.SnapshotWindow() select MyUdo(win) The “many-or-one” confusion is exemplified by the following example that compiles but fails at runtime: from win in xs.SnapshotWindow() select MyUdo(win) + win.Count() The above query must fail because the UDO is in fact returning many values per window while the count aggregate is returning one. Original syntax New alternate syntax from win in xs.SnapshotWindow() select win.UdoProxy(1) from win in xs.SnapshotWindow() from y in win.UserDefinedOperator(() => new Udo(1)) select y -or- from win in xs.SnapshotWindow() from y in win.UdoMacro(1) select y Notice that this formulation also sidesteps the dynamic type pitfalls of the existing “proxy method” approach to UDOs, in which the type of the UDO implementation (TInput, TOuput) and the type of its constructor arguments (TConfig) need to align in a precise and non-obvious way with the argument and return types for the corresponding proxy method. UDSO syntax UDSO currently leverages the DataContractSerializer to clone initial state for logical instances of the user operator. Initial state will instead be described by an expression in the new LINQ surface. Before After xs.Scan(new Udso()) xs.Scan(() => new Udso()) Name changes ShiftEventTime => AlterEventStartTime: The alter event lifetime overload taking a new start time value has been renamed. CountByStartTimeWindow => CountWindow

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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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• What is the best way to render a 2d game map?

  - by Deukalion

  I know efficiency is key in game programming and I've had some experiences with rendering a "map" earlier but probably not in the best of ways. For a 2D TopDown game: (simply render the textures/tiles of the world, nothing else) Say, you have a map of 1000x1000 (tiles or whatever). If the tile isn't in the view of the camera, it shouldn't be rendered - it's that simple. No need to render a tile that won't be seen. But since you have 1000x1000 objects in your map, or perhaps less you probably don't want to loop through all 1000*1000 tiles just to see if they're suppose to be rendered or not. Question: What is the best way to implement this efficiency? So that it "quickly/quicker" can determine what tiles are suppose to be rendered? Also, I'm not building my game around tiles rendered with a SpriteBatch so there's no rectangles, the shapes can be different sizes and have multiple points, say a curved object of 10 points and a texture inside that shape; Question: How do you determine if this kind of objects is "inside" the View of the camera? It's easy with a 48x48 rectangle, just see if it X+Width or Y+Height is in the view of the camera. Different with multiple points. Simply put, how to manage the code and the data efficiently to not having to run through/loop through a million of objects at the same time.

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• Career opportunities for mid-20 .Net developer

  - by Valera Kolupaev

  Recently, I have moved to Toronto and started exploring career opportunities here. My first impressions about .net developer/architect career are really controversial. Here options that comes to my mind right now: Grow as a developer, lead and solution architect in large and well-known company, like Logitech or IBM. Doing .net development medium size (10-30) software shops Joining some start-up guys First one, seems very bureaucratic with kills all programming fun, that is such valuable to me. And there is not a lot of start ups, that are based on MS technology stack. Good mid-size company seems like a best fit to me, since I can have a lot of fun, doing new projects. Previously I have been working at large (5000+) outsourcing provider as a .Net developer. I was kind of a 'vanilla' time, because our team were always doing massive scale projects from scratch, on latest .Net stack. I would really appreciate if you share pros and cons of path, that you have chosen and what you value most in your current project. I'll start: Pros for Mid-size You are really close to business and application consumers, without all bureaucratic papers Cons It seems, that career oportunities of vertical growth is rather limited, once I have to switch to my own company or join development team of some big players.

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• USB device changes using udev and D-Bus

  - by kicsyromy

  I am trying to get a list of currently plugged in USB devices in Ubuntu 10.10 and monitor changes that happen, like devices being plugged in or out using udev and D-Bus. I'm fairly new to programming using D-Bus. I saw one example: "Linux: How to detect is usb keyboard is plugged and unplugged". Problem is that it uses HAL and I know that HAL is deprecated. I found some working code, but it's working only with storage devices such as USB sticks, media players or CD-ROM drives. I want the whole thing: mice, keyboards, USB cameras, chargers; anything that is plugged in to the USB. How can I listen D-Bus events for any USB device plug and unplug? This is basically what I have now (also): import dbus import gobject from dbus.mainloop.glib import DBusGMainLoop def device_added_callback(device): print 'Device %s was added' % (device) def device_changed_callback(device): print 'Device %s was changed' % (device) #must be done before connecting to DBus DBusGMainLoop(set_as_default=True) bus = dbus.SystemBus() proxy = bus.get_object("org.freedesktop.UDisks", "/org/freedesktop/UDisks") iface = dbus.Interface(proxy, "org.freedesktop.UDisks.Device") devices = iface.get_dbus_method('EnumerateDevices')() print '%s' % (devices) #addes two signal listeners iface.connect_to_signal('DeviceAdded', device_added_callback) iface.connect_to_signal('DeviceChanged', device_changed_callback) #start the main loop mainloop = gobject.MainLoop() mainloop.run()

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• Using prefix incremented loops in C#

  - by KChaloux

  Back when I started programming in college, a friend encouraged me to use the prefix incrementation operator ++i instead of the postfix i++, citing that there was a slight chance of better performance with no real chance of a downside. I realize this is true in C++, and it's become a general habit that I continue to do. I'm led to believe that it makes little to no difference when used in a loop in C#, regardless of data type. Apparently the ++ operator can't be overridden. Nevertheless, I like the appearance more, and don't see a direct downside to it. It did astonish a coworker just a moment ago though, he made the (fairly logical) assumption that my loop would terminate early as a result. He's a self-taught programmer, and apparently never came across the C++ convention. That made me question whether or not the equivalent behavior of pre- and post-fix increment and decrement operators in loops is well known enough. Is it acceptable for me to continue using ++i in looping constructs because of style preference, even though it has no real performance benefit? Or is it likely to cause confusion amongst other programmers? Note: This is assuming the ++i convention is used consistently throughout all code.

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