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• Microsoft Async CTP for DDD9 UK Developer Conference - slides and source code now available

  - by Liam Westley

  Thanks to all the nice comments from people who attended my presentation at DDD9, and extra thanks to Jon Skeet, Mark Rendle and Mike Hadlow for coming on stage for the last ten minutes to help debate whether the Async CTP is the correct way to go to enhance C# 5.0. The presentation is available at Prezi.com http://prezi.com/gysz5nohltye, which I can recommend as a refreshing change to the more standard PowerPoint slidedecks. I've also uploaded all the code samples into a single ZIP file. You will need to install the Async CTP to be able to run them, and I would remind everyone that the current Async CTP is not compatible with either ASP.NET MVC 3 RTM or Visual Studio 2010 Service Pack 1 so you may need to use a test system of virtual machine to play with it! Source code - http://www.tigernews.co.uk/blog-twickers/ddd9/AsyncSrc.zip Again, thanks for all the positive feedback and the whole of the DDD team for putting on a fantastic conference for all the presenters and delegates.

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• How can I remove packages using preseed?

  - by Jorge Castro

  I'm setting up an automated "no questions asked" preseed system and using Dustin Kirkland's server preseed as an example. He uses the following line to install three packages as part of the automated install: d-i pkgsel/include string byobu vim openssh-server I am looking for the inverse of this, basically be able to remove packages as part of the automated install. I've checked the Installation Guide I've checked this example preseed, but it's not clear if this is the canonical list of every single option available. I am thinking I need to to use d-i preseed/late_command string apt-remove packagename to clean up stuff I don't want when the install is done, but I am not sure

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• Can an object oriented program be seen as a Finite State Machine?

  - by Peretz

  This might be a philosophical/fundamental question, but I just want to clarify it. In my understanding a Finite State Machine is a way of modeling a system in which the system's output will not only depend on the current inputs, but also the current state of the system. Additionally, as the name suggests it, a finite state machine can be segmented in a finite N number of states with its respective state and behavior. If this is correct, shouldn't every single object with data and function members be a state in our object oriented model, making any object oriented design a finite state machine? If that is not the interpretation of a FSM in object design, what exactly people mean when they implement a FSM in software? am I missing something? Thanks

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• Video capture Performance

  - by volting

  I have noticed high CPU utilization in a number of applications (except mplayer) which read from the embedded webcam on my laptop. Bizarrely CPU utilization varies proportionately to the level of illumination present. I know that that high CPU usage has nothing to do with rendering the video, as I have written a simple app using the OpenCV library to simply grab frames from the webcam, and cpu usage is still high. I think that mplayer might be using my GPU (and the other apps aren't), but since its not an issue with rendering, I dont think this explains anything. Cheese Low light --- ~12% CPU Bright Light ---- ~63% CPU Camorama Low light --- ~7% CPU Bright Light ---- ~30% CPU Opencv C++ library, (display in a single highgui window) Low light --- ~13% CPU Bright Light ---- ~40% CPU (same test on windows 7, 4-9%) Mplayer No problem, 1-2% regardless of light levels Note: If all I want't to do is capture a feed from my webcam I would use mplayer and forget about it, but I'm developing an application which uses the OpenCV to capture a video feed among other things, performance is important.

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• Suggest-a-Session for Oracle Develop 2010: Last chance to get your paper submitted.

  - by olaf.heimburger

  While working with Oracle Technologies at customer projects we all come across solutions and ideas that are worth to share with a greater audience. When you missed the Call For Paper for Oracle OpenWorld and Oracle Develop you have the chance to get in. The Oracle Mix Community provides a tool called Suggest-a-Session for submitting and voting the sessions you would like to attend. My Suggestions When you pass by, do not forget to vote for my sessions. These are: Real-World Single Sign-On and ADF Security The Personal Newsletter Generator: Implement Cool Applications with ADF Faces Thank you for your support.

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• Ubuntu only recognizes one partition from multi partitions SD card

  - by Jay Ngo

  Hello everybody, I split my sd card into 2 partitions. When i use usb-card-reader to read my sd card, only the one partition shows up on the screen, the other doesn't. I have run the command "sudo fdisk -l" and the result is the same, only one partition is recognized. But i do believe both partitions of my sd card work fine, because i still can boot my single-board computer with that sd card and run some programms, which are inside that unreadable partition. How can i access both partitions of my sd card? Does anyone know how to solve this kind of problem? I really appreciate your help.

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• Getting out of my head

  - by BenCole

  (I put this on SO, but it got a couple close votes saying it belonged here instead...) I've spent the last year as a single person team developing a rich-client application (35,000+ LoC, for what it's worth). It's currently stable and in production. However, I know that my skills were rusty at the beginning of the project, so without a doubt there are major issues to the code. At this point, most of the issues are in architecture, structure, or interactions - the easy problems, even architecture/design problems, have already been weeded out. Unfortunately, I've spent so much time with this project that I'm having a hard time thinking outside of it - approaching it from a new perspective to see the flaws deeply buried or inherent in the design. How do I step outside my head and outside my code so I can get a fresh look at this code so I can make it better? Is this less of an issue than I think it is, or is this a problem for other people as well?

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• Switch from encrypted partition to unencrypted (Error: cryptsetup: evms_activate is not available)

  - by Chris Lercher

  I initially installed Ubuntu 11.04 with an encrypted file system (from the alternate install CD: Guided Partitioning, LVM encrypted). Now I wanted to change this setup to have my root file system on an unencrypted partition. I had the following setup before: /dev/mapper/my-root on / type ext4 (rw,noatime,errors=remount-ro,commit=0,commit=0) /dev/sda1 on /boot type ext2 (rw,noatime) I backed up /, reformatted /dev/sda5 (which had contained the encrypted LVM device) to an ext3 partition, and restored / to that partition. I edited /etc/fstab, removed the line /dev/mapper/my-root / ..., and added the line: /dev/sda5 / ext3 noatime,rw,errors=remount-ro,commit=0 0 1 I edited /etc/crypttab, and commented out the single entry. On reboot, I get the grub screen as usual, but then I get the message cryptsetup:evms_activate is not available, waiting for encrypted source device. I tried reinstalling Grub2 using a LiveCD with the ChRoot method, but that didn't make any difference. Why is Ubuntu still searching for an encrypted device?

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• File system implementation in MongoDB with GridFS

  - by Ralph

  I am working on two projects that will both implement a Webdav server backed by a MongoDB GridFS. In each case, there is the potential for the system to store tens of millions of files spread across thousands of hierarchical directories. I can come up with two different ways of storing the directory structure: As a "true" hierarchical file system, with directories containing the IDs (_id) of subdirectories and regular files. The paths will be separated by slashes (/) as in a POSIX-compliant file system. The path /a/b/c will be represented as a directory a containing a directory b containing a file c. As a flat file system, where file names include the slashes. The path /a/b/c will be stored as a single file with the name /a/b/c What are the advantages and disadvantages of each, with respect to a "real" folder-based file system?

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• Disconnected Online Customer Experience? Connect It with Oracle WebCenter

  - by Christie Flanagan

  Engage. Empower. Optimize. Today's customers have higher expectations and more choices than ever before. Successful organizations must deliver an engaging online experience that is personalized, interactive and consistent across all phases of the customer journey. This requires a new approach that connects and optimizes all customer touch points as they research, select and transact with your brand. Attend this webcast to learn how Oracle WebCenter: Works with Oracle ATG Commerce and Oracle Endeca to deliver consistent and engaging browsing, shopping and search experiences across all of your customer facing websites Enables you to optimize the performance of your online initiatives through integration with Oracle Real-Time Decisions for automated targeting and segmentation Connects with Siebel CRM to maintain a single view of the customer and integrate campaigns across channels Register now for the Webcast. Register Now Thurs., November 8, 2012 10 a.m. PT / 1 p.m. ET Presented by: Joshua DuhlSenior Principal Product ManagerOracle WebCenter Christie FlanaganDirector of Product MarketingOracle WebCenter

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• Hide individual regions on a territory map

  - by Paul

  I have a map of adjacent irregularly-shaped territories. It happens to be a county map, but that's not important. In the game, the player only sees a few to start, and as he progresses to new territories, the ones adjacent to it are revealed. It's a territory-scale fog-of-war. I'm using Unity3D, and my inclination is to make a set of planes, each of which has an image of a single territory on it, and then arrange them manually like a jigsaw puzzle. It then is fairly easy to respond to a click on each region and also to mark the planes as visible or invisible, or even do clever things like fade or zoom on individual regions. This sounds like an arduous task, and if we need to change the visual design of the territories, we'd have to cut up the main map all over again into each of the individual pieces. Does anyone have a more elegant solution to this problem?

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• How to host a simple website using a domain name I own

  - by Cedric Martin

  I'm familiar with hosting webapps when I'm doing "the whole shebang" of installing / configuring / setting up Apache/Tomcat/PostreSQL / "coding" the website myself using HTML / JSP / CSS etc. on dedicated servers I'm renting. But in the above case, I'm "owning" the entire stack: from the Debian GNU/Linux dedicated servers to every single file that is served. Now I'd like to do something much simpler and I must admit I don't know what's involved at all. I'd like to host a simple website made of only a few static pages (no database, no nothing) and I'd like it to be accessible from "example.com". What needs to be technically done to have such a thing? How is the DNS supposed to be set up? Note that I do not want to host this on one of my dedicated servers.

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• Server for online browser game

  - by Tim Rogers

  I am going to be making an online single player browser game. The online element is needed so that a player can login and store the state of their game. This will include things like what buildings have been made and where they have been positioned as well as the users personal statistics and achievements. At this point in time, I am expecting all of the game logic to be performed client side So far, I am thinking I will use flash for creating the client side of the game. I am also creating a MySQL database to store all the users information. My question is how do I connect the two. Presumably I will need some sort of server application which will listen for incoming requests from any clients, perform the SQL query and then return the data. Does anyone have any recommendations of what technology/language to use?

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• Connectify Dispatch Links Multiple Network Nodes Into a Mega Connection

  - by Jason Fitzpatrick

  Connectify Dispatch wants to change the way you interact with the networks around you by making it dead simple to mesh all available Wi-Fi, Cellular, and Ethernet connections into a massive and stable pipeline. Dispatch makes it open-and-click easy to hook up multiple Wi-Fi nodes, your cellphone, and even Ethernet connections into a single blended connection. While the video above gives a great overview of the process, check out the video below to see it in real world action: The project is currently in the last phase of KickStarter funding, so now is a great time to score Connectify Dispatch at a steep discount–pledging as little as $10 to fund the project, for example, scores you 50% of a 6-month Pro license. Hit up the link below to read more about the project, check the KickStarter status, and see all the neat features in the development pipeline. Dispatch: The Internet, Faster. [KickStarter] HTG Explains: What The Windows Event Viewer Is and How You Can Use It HTG Explains: How Windows Uses The Task Scheduler for System Tasks HTG Explains: Why Do Hard Drives Show the Wrong Capacity in Windows?

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• OBIEE 11g recommended patch sets

  - by THE

   Martin has busied himself to combine the recommended patch sets for OBIEE 11g into one single useful KM note.(This one contains the recommendations for 11.1.1.5 as well as those for 11.1.1.6) OBIEE 11g: Required and Recommended Patches and Patch Sets (Doc ID 1488475.1) So if you are looking for update/patch information for your OBIEE installation - this is most likely a useful stop. And as patching is an ongoing process you may want to bookmark this KM doc, as I am sure Martin will keep this current as new patches come out. Oh - and if you are looking for upgrade information from 11.1.1.5 to 11.1.1.6, KM Doc ID 1434253.1 might just be the thing you are looking for.

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• Where are the LXDE sound preferences?

  - by Uri Herrera

  I'm confused,how can I change the sound output in LXDE? There's not even a single option anywhere unlike other environments. I've tried doing anything with alsamixerbut still nothing, the output device is the HDMI audio of a Radeon HD card. Edit: As it Turns out i was able to change the ouput device, but i had to use Gnome for that and its Gnome Sound applet, that is log out and log in in Gnome change the device, log out and log back in LXDE. Now the question becomes Why can't i do this in LXDE?

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• Week in Geek: Malware-Infected Web Sites Doubled Since Last Year

  - by Asian Angel

  This week we learned how to get spelling autocorrect across all applications on a Windows system, “diagnose DSL hang ups, extract media files from PowerPoint presentations, & restrict IE to a single website”, customize the Ubuntu bootloader screen, get smartphone-style word suggestion on Windows systems, learned what character encodings are and how they differ, and more. Photo by Profound Whatever.HTG Explains: What Are Character Encodings and How Do They Differ?How To Make Disposable Sleeves for Your In-Ear MonitorsMacs Don’t Make You Creative! So Why Do Artists Really Love Apple?

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• Internal and external API architecture

  - by Tacomanator

  The company I work for maintains a successful SaaS product that grew "organically" over the years. We are planning to expand the line with a suite of new products that will share data with the existing product. To support this, we are looking to consolidate business logic into a single place: a web service layer. The WS layer will be used by: The web applications A tool to import data A tool to integrate with other client software (not an API per se) We also want to create an API that can be used by our customers that are capable of using it to create their own integrations. We are struggling with the following question: Should the internal API (aka the WS layer) and the external API be one in the same, with security and permission settings to control what can be done by who, or should they be two separate applications where the external API just calls the internal API like any other application? So far in our debate it seems that separating them may be more secure, but will add overhead. What have others done in a similar situation?

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• Best way to address this Magento issue

  - by robgt

  I am in need of some advice/pointers on how best to attack a problem I am faced with in Magento 1.4.0.1. Here is the scenario: Consider a product catalog of multiple thousands of products in which there are many and various retail markup percentages. There is a need to sell some of those products to other retailers, and I need a way to easily categorise them into percentrage markup groups, so that the other traders can easily purchase items from us without needing to call and confirm pricing. All products prices are added to the magento database including VAT - so the actual retail value is the starting point. I think this needs to be done by adding an attribute on the products that determines the maximum discount level that can be applied to any given product. Obviously, this would entail a massive amount of work to update every product. Is there a way to achieve what we need that I don't yet know about (within Magento)? Can single attribute values be mass-populated somehow, without affecting other attributes such as name/description/etc?

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• Actor based concurrency and cancellation

  - by Akash

  I'm reading about actor based concurrency and I appreciate the simplicity of actors sequentially processing messages on a single thread. However there is one scenario that doesn't seen possible. Suppose that actor A sends a message to actor B, who then performs some long running task and returns a completion message to actor A. How can actor A force actor B to cancel the long running task after it has started? If actor B is running the task in its message queue thread, it won't pick up the cancellation message until it had completed the task; if actor B runs the task in a background thread then it seems to be violating the principle of actors. Is there a common way that this scenario is handled with actors? Or does each actor language/framework take a different approach? Or is this not a suitable problem to tackle via actors?

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• Are there well-known examples of web products that were killed by slow service?

  - by Jeremy Wadhams

  It's a basic tenet of UX design that users prefer fast pages. http://www.useit.com/alertbox/response-times.html http://www.nytimes.com/2012/03/01/technology/impatient-web-users-flee-slow-loading-sites.html?pagewanted=all It's supposedly even baked into Google's ranking algorithm now: fast sites rank higher, all else being equal. But are there well known examples of web services where the popular narrative is "it was great, but it was so slow people took their money elsewhere"? I can pretty easily think of example problems with scale (Twitter's fail whale) or reliability (Netflix and Pinterest outages caused by a single datacenter in a storm). But can (lack of) speed really kill?

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• How to build a team of people not working together?

  - by Bernd

  I am in charge of a group of about 30 software development experts and architects. While these people are co-located in the companies organization chart, they do not really feel as a team. This is due to their work enviroment: 1) The people are spread over eight locations, with a max. distance of about 1000km (this is Europe). 2) The people don't work as team but instead get called as single people (and sometimes small groups into projects for as long as the projects run. 3) Travelling is somewhat limited as this requires business reasons. Lot is done via phone. Do you have ideas or suggestions on how I could make these people feeling part of a joint organization where they support others and get supported by others. So that they get to know their peers, build a network, informally exchange information? So that they generally get the feeling of having common ground and derive motivation and job satisfaction?

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• What is the benefit of writing to a temp location, And then copying it to the intended destination?

  - by Devdatta Tengshe

  I am writing an application that works with satellite Images, and my boss asked me to look at some of the commercial application, and see how they behave. I found a strange behavior and then as I was looking, I found it in other standard applications as well. These Programs first write to the temp folder, and then copy it to the intended destination. Example: 7zip first extracts to the temp folder, and then copies the extracted data to the location that you had asked it to extract the data to. I see several problems with this approach: 1.The temp folder might not have enough space, while the intended location might have that much space. 2.If it is a large file, it can take a non-negligible amount of time for the copy operation. I thought about it a lot, but I couldn't see one single positive point to doing this. Am I missing something, or is there a real benefit to doing this?

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• Your software-problem-solution approach

  - by Panoy

  I am unfamiliar with many software development philosophies/approaches such as these: DDD - Domain Driven Development Design TDD - Test Driven Development BDD - Behavior Driven Development Other 3-letter acronym that ends with "development" and many more My question is, when will you get to decide to choose what kind of philosophy/approach to follow? Especially the top 3 approach in the list: What is TDD for? Why use DDD for this problem? Mainly your answer would be a case-to-case basis or maybe that there is no single universal philosophy/approach to consider. In that case, could you just tell me what type of project/scenario and why did you use that philosophy/approach.

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• Splitting up revenue among development team members on Apple's app store

  - by itaiferber

  A friend and I have started developing an app to put on Apple's app store. Development is going fine, but thinking ahead, we're trying to come up with an easy way to share any revenue coming from our efforts. The app store allows you to deposit your revenue into a single bank account, but there's no easy way to split revenue among several people. How do (small) dev teams split up revenue on their products, on, and off the app store? As far as I can tell, banks don't offer an easy way to automatically split the balance on an account 50-50 (or any other percentage, for that matter), especially on a regular basis. So how do teams deal with this? We're not incorporated, and we don't have an official business set up. We're considering depositing all the money into one of our accounts and manually transferring half the money to the other person, but this isn't sustainable over long periods of time. Is there a low-cost, sustainable, automatic process for handling these finances?

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