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• Can't Miss Event: Oracle Coherence 12c Launch Webcast

  - by jeckels

  We're super-excited around here about the impending launch of Oracle Coherence 12c as part of the Cloud Application Foundation launch this month! We want you to join us for the Cloud Application Foundation launch event to learn more about Coherence's ability to deliver applications with a mission-critical cloud platform, enhance deployment options for high availability and simplify operations with integrated products and management. Scale your applications to meet mobile and cloud demands! Oracle Cloud Application Foundation Launch Including Oracle WebLogic Server, Oracle Coherence, Oracle Enterprise Manager and Oracle Development ToolsJuly 31st, 2013 10am Pacific Time >> Register now! (of course, it's free) This will be the first release of Coherence we're making available at the same time as an Oracle WebLogic Server release - and that's not a coincidence. One of the main focus areas of this launch is the operational simplicity that we want you to enjoy, and that includes a tight integration not only with WebLogic Server itself, but also with cloud management tools (Enterprise Manager) and developer technologies - like JDeveloper, Eclipse tools, ADF Mobile and more - to ensure you can be productive out of the box on day one. The word is, there are even some heavy-duty capabilities Coherence will be delivering around real-time data processing, elastic scalability, developer technology friendliness and even some deep integration with Oracle Database 12c, which is launching on July 10th. But, we're already giving away too much. We look forward to seeing you there!

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• Do you know about the Visual Studio 2010 Architecture Guidance?

  - by Martin Hinshelwood

  If you have not seen the Visual Studio 2010 Architectural Guidance from the Visual Studio ALM Rangers then you are missing out. I have been spelunking the TFS Guidance recently and I discovered the Visual Studio 2010 Architectural Guidance. This is not an in-depth look at the capabilities of the architectural tools that shipped with Visual Studio 2010 Ultimate, but is instead a set of samples that lead you by example through real world scenarios. There is practical guidance and checklists to help guide lead developers and architects through the common challenges in understanding both existing and new applications. The content concentrates on practical guidance for Visual Studio 2010 Ultimate and is focused on modelling tools. There is integration into Visual Studio so all you need to do to access it is select “Architecture | Visual Studio ALM Rangers – Architecture Guidance”. Figure: Accessing the Architecture guidance is easy This brings up an inline version of the documentation and a kind of Explorer that lets you pick the tasks you want to perform and takes you strait to that part of the Guidance. Figure: Access the Guidance from right within Visual Studio 2010 This is a big help when you just want to figure out how to do something and can’t be bothered searching for and through the content in the provided Word documents. The Question and Answer section is full of useful content and there are six Hands-On-Labs to sink your teeth into: Creating extensions with the feature extension Explore an Existing System Scenario Extensibility Layer Diagrams New Solution Scenario Reusable Architecture Scenario Validation an Architecture Scenario I’m sold! Where can i get my hands on this fantastic content? Download the Visual Studio 2010 Architecture Tooling Guidance and if you like it don’t forget to add a review to make the team that put it together in their spare time feel all the mere loved.

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• Does immutability entirely eliminate the need for locks in multi-processor programming?

  - by GlenPeterson

  Part 1 Clearly Immutability minimizes the need for locks in multi-processor programming, but does it eliminate that need, or are there instances where immutability alone is not enough? It seems to me that you can only defer processing and encapsulate state so long before most programs have to actually DO something. If a program performs actions on multiple processors, something needs to collect and aggregate the results. All this involves multi-process communication before, after, and possibly during some transformations. The start and end state of the machines are different. Can this always be done with no locks just by throwing out each object and creating a new one instead of changing the original (a crude view of immutability)? What cases still require locking? I'm interested in both the theoretical/academic answer and the practical/real-world answer. I know a lot of functional programmers like to talk about "no side effect" but in the "real world" everything has a side effect. Every processor click takes time and electricity and machine resources away from other processes. So I understand that there may be more than one perspective to answer this question from. If immutability is safe, given certain bounds or assumptions, I want to know what the borders of the "safety zone" are exactly. Some examples of possible boundaries: I/O Exceptions/errors Interfaces with programs written in other languages Interfaces with other machines (physical, virtual, or theoretical) Special thanks to @JimmaHoffa for his comment which started this question! Part 2 Multi-processor programming is often used as an optimization technique - to make some code run faster. When is it faster to use locks vs. immutable objects? Given the limits set out in Amdahl's Law, when can you achieve better over-all performance (with or without the garbage collector taken into account) with immutable objects vs. locking mutable ones? Summary I'm combining these two questions into one to try to get at where the bounding box is for Immutability as a solution to threading problems.

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• using a wiki for requirements

  - by apollodude217

  Hi, I'm looking into ways of improving requirements management. Currently, we have a Word document published on a Web site. Unfortunately, we cannot (to my knowledge) look at changes from one revision to the next. I would greatly prefer to be able to do so, much like with a wiki or VCS (or both, like the wiki's on bitbucket!). Also, each document describes changes devs are expected to meet by a given deadline. There is no collection of accumulated app features documented anywhere, so it's sometimes hard to distinguish between a bug and a (poorly-designed) feature when trying to make quick fixes to legacy apps. So I had an idea I wanted to get feedback on. What about: Using a wiki so that we can track who changed what when (mostly to even see if any edits were made since the last time one looked). Having one, say, wiki page per product rather than one per deadline, keeping up with all features of the product rather than the changes that should be implemented. This way, I can look at a particular revision of the page to see what the app should do at a given point in time, and I can look at changes to the page since the last release for the requirements to be implemented by the next deadline. Waddayathink?

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• Running multiple box2D world objects on a server

  - by CharbelAbdo

  I'm creating a multiplayer game using LibGdx (with Box2d) and Kryonet. Since this is the first time I work on multiplayer games, I read a bit about server - client implementations, and it turns out that the server should handle important tasks like collision detection, hits, characters dying etc... Based on some articles (like the excellent Gabriel Gambetta Fast paced multiplayer series), I also know that the client should work in parallel to avoid the lag while the server responds to commands. Physics wise, each game will have 2 players, and any projectiles fired. What I'm thinking of doing is the following: Create a physics world on the client When the game is signaled to start, I create the same physics world on the server (without any rendering obviously). Whenever the player issues a command (move or fire), I send the command to the server and immediately start processing it on the client. When the server receives the command, it applies it on the server's world (set velocity etc...) Each 100ms, the server sends the new state to the client which corrects what was calculated locally. Any critical action (hit, death, level up) is calculated only on the server and sent to the client. Essentially, I would have a Box2d World object running on the server for each game in progress, in sync with the worlds running on the clients. The alternative would be to do my own calculations on the server instead of relying on Box2D to do them for me, but I'm trying to avoid that. My question is: Is it wise to have, for example, 1000 instances of the World object running and executing steps on the server? Tomcat used around 750 MBytes of memory when trying it without any object added to the world. Anybody tried that before? If not, is there any alternative? Google did not help me, are there any guidelines to use when you want to have physics on both the client and the server? Thanks for any help.

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• Making The EBS Upgrade From 11.5.10 Easier - Part III

  - by Annemarie Provisero

  ADVISOR WEBCAST: Making The EBS Upgrade From 11.5.10 Easier - Part III PRODUCT FAMILY: E-Business Suite July 19, 2011 at 8 am PT, 9 am MT, 11 am ET This one-hour session is recommended for technical users who are responsible for upgrading their E-Business Suite applications from Release 11.5.10 to Release 12.1.x. As you begin your upgrade process, there are a number of tools available to assist you in a successful upgrade. A successful upgrade requires careful planning, correct upgrade processing, detailed testing, and user (re)training prior to upgrade. Over three sessions we will discuss the tools that you can use to assist in your upgrade tasks. These tools are available to you via My Oracle Support and as part of the E-Business Suite product offerings. In this third session, we’ll cover the Best Practices for Using The Upgrade Tools. Additionally, this session includes an extended question and answer period. In the first part of the three-session series, we covered the following topics: Overview of Tools Available for Upgrading Upgrade versus Re-implementing Upgrade Community Upgrade Product Information Center Page Detailed Look at Upgrade Advisor In the second session, we covered the following topics: Recap of Part I Detailed Look at Maintenance Wizard Detailed Look at Patch Wizard A replay of those sessions is available via Note 740964.1, Advisor Webcast Archive. A short, live demonstration (only if applicable) and question and answer period will be included. Oracle Advisor Webcasts are dedicated to building your awareness around our products and services. This session does not replace offerings from Oracle Global Support Services. Click here to register for this session ------------------------------------------------------------------------------------------------------------- The above webcast is a service of the E-Business Suite Communities in My Oracle Support. For more information on other webcasts, please reference the Oracle Advisor Webcast Schedule.Click here to visit the E-Business Communities in My Oracle Support Note that all links require access to My Oracle Support.

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• Site Web Analytics not updating Sharepoint 2010

  - by Rohit Gupta

  If you facing the issue that the web Analytics Reports in SharePoint 2010 Central Administration is not updating data. When you go to your site > site settings > Site Web Analytics reports or Site Collection Analytics reports  You get old data as in the ribbon displayed "Data Last Updated: 12/13/2010 2:00:20 AM" Please insure that the following things are covered: Insure that Usage and Data Health Data Collection service is configured correctly. Log Collection Schedule is configured correctly Microsoft Sharepoint Foundation Usage Data Import and Microsoft SharePoint Foundation Usage Data Processing Timer jobs are configured to run at regular intervals One last important Timer job is the Web Analytics Trigger Workflows Timer Job insure that this timer job is enabled and scheduled to run at regular intervals (for each site that you need analytics for). After you have insured that the web analytics service configuration is working fine and the Usage Data Import job is importing the *.usage files from the ULS LOGS folder into the WSS_Logging database, and that all the required timer jobs are running as expected… wait for a day for the report to get updated… the report gets updated automatically at 2:00 am in the morning… and i could not find a way to control the schedule for this report update job. So be sure to wait for a day before giving up :)

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• O'Reilly deals to April 5, 2012 14:00 PT on books on "where"

  - by TATWORTH

  At http://shop.oreilly.com/category/deals/where-conference.do, O'Reilly are offering a series of books on geo-location at 50% off until April 5, 2012 14:00 PT. HTML5 Geolocation Truly revolutionary: now you can write geolocation applications directly in the browser, rather than develop native apps for particular devices. This concise book demonstrates the W3C Geolocation API in action, with code and examples to help you build HTML5 apps using the "write once, deploy everywhere" model. Along the way, you get a crash course in geolocation, browser support, and ways to integrate the API with common geo tools like Google Maps. HTML5 Cookbook With scores of practical recipes you can use in your projects right away, this cookbook helps you gain hands-on experience with HTML5’s versatile collection of elements. You get clear solutions for handling issues with everything from markup semantics, web forms, and audio and video elements to related technologies such as geolocation and rich JavaScript APIs. Each informative recipe includes sample code and a detailed discussion on why and how the solution works. Perfect for intermediate to advanced web and mobile web developers, this handy book lets you choose the HTML5 features that work for you—and helps you experiment with the rest. HTML5 Applications HTML5 is not just a replacement for plugins. It also makes the Web a first-class development environment by giving JavaScript programmers a solid foundation for building industrial-strength applications. This practical guide takes you beyond simple site creation and shows you how to build self-contained HTML5 applications that can run on mobile devices and compete with desktop apps. You’ll learn powerful JavaScript tools for exploiting HTML5 elements, and discover new methods for working with data, such as offline storage and multi-threaded processing. Complete with code samples, this book is ideal for experienced JavaScript and mobile developers alike. There are also other books being offered at a discount at http://shop.oreilly.com/category/deals/where-conference.do

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• SSIS Denali as part of “Enterprise Information Management”

  - by jorg

  When watching the SQL PASS session “What’s Coming Next in SSIS?” of Steve Swartz, the Group Program Manager for the SSIS team, an interesting question came up: Why is SSIS thought of to be BI, when we use it so frequently for other sorts of data problems? The answer of Steve was that he breaks the world of data work into three parts: Process of inputs BI   Enterprise Information Management All the work you have to do when you have a lot of data to make it useful and clean and get it to the right place. This covers master data management, data quality work, data integration and lineage analysis to keep track of where the data came from. All of these are part of Enterprise Information Management. Next, Steve told Microsoft is developing SSIS as part of a large push in all of these areas in the next release of SQL. So SSIS will be, next to a BI tool, part of Enterprise Information Management in the next release of SQL Server. I'm interested in the different ways people use SSIS, I've basically used it for ETL, data migrations and processing inputs. In which ways did you use SSIS?

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• Maximum 5 minute battery life with Ubuntu 11.10 on HP laptop

  - by JamesG

  I apologise if this question is too similar to the numerous others already asked, but it seems that my difference in battery life is significantly more noticeable than others that have been reported. I recently installed Ubuntu 11.10 on my HP Pavilion dv6 laptop (which I purchased brand new just under one year ago). When running Windows 7 on this laptop, I have been able to get up to two and a half to three hours of battery life with wireless disabled and when running only Microsoft Word. However, when running Ubuntu, I am unable to use the laptop if it is not plugged in. Upon unplugging the fully-charged machine from the power cord, if I have wireless enabled, I immediately receive a notification that the battery levels are critically low and that shutdown is imminent. Even if I replace the power plug, the laptop shuts down within thirty seconds. If I disable wireless capability, I am able to run the laptop for an absolute maximum of five minutes on battery powers before receiving the same message. I have tried running with Jupiter on Power Saver mode, but to no noticeable effect. Ignoring the fact that I can't use my laptop without being attached to a power source, I really do enjoy using Ubuntu, and hence would greatly appreciate any help that can be offered.

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• Problem using graphics.h in Ubuntu

  - by blooooomer

  # include<stdio.h> # include<graphics.h> # include<math.h> using namespace std; int main(void) { int gd=DETECT,gm; int r,x,y,p,xc=320,yc=240; initgraph(&gd,&gm,NULL); cleardevice(); printf("Enter the radius "); scanf("%d",&r); x=0; y=r; putpixel(xc+x,yc-y,1); p=3-(2*r); for(x=0;x<=y;x++) { if (p<0) { y=y; p=(p+(4*x)+6); } else { y=y-1; p=p+((4*(x-y)+10)); } putpixel(xc+x,yc-y,1); putpixel(xc-x,yc-y,2); putpixel(xc+x,yc+y,3); putpixel(xc-x,yc+y,4); putpixel(xc+y,yc-x,5); putpixel(xc-y,yc-x,6); putpixel(xc+y,yc+x,7); putpixel(xc-y,yc+x,8); } getch(); closegraph(); } installed graphics.h compiled using gcc filename.cpp -0 filename -lgraph then used ./filename the window apperared for 10 seconds and the error below appears: [xcb] Unknown sequence number while processing queue [xcb] Most likely this is a multi-threaded client and XInitThreads has not been called [xcb] Aborting, sorry about that. heart: ../../src/xcb_io.c:273: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed. Aborted Any solutions?

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• Which software to keep track of my project?

  - by Exa

  I'm about to start the first real phase of my game development which will consist of the acquisition of information, resources and the definition of where I want to go and what I will need for that. I just want to make sure that I'm prepared as best as possible before I actually start development. I don't like the thought of using Microsoft Word or Excel for my project management... I already worked with MS Project but I don't think it fits my needs. I need a software where I can easily maintain project steps, milestones, important issues, information about technologies and engines I use, as well as simple notes and thoughts I just want to write down. I usually prefer a whiteboard for stuff like that but unfortunately it's not a persistent way of storing. ;) Also writing it down the old-school way is something I can think of, but only for quick notes... Which software do you use for that? Are there commonly used programs? Is there any free software at all?

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• How do I get Graphics drivers / bluetooth / card reader working on an Acer Aspire V3-571G?

  - by Adam

  A couple of days ago I bought an Acer Aspire V3-571G laptop without a system installed on it. The only thing that was there was Linux Linpus. I created a bootable CD with Ubuntu 12.04 64-bit - I read that my processor was 64 bit and that it might be a good configuration for my gear (I'm not especially fluent with all the computer stuff, still trying to learn) and replaced Linpus with Ubuntu. Everything seemed to work fine, but there're few exceptions to that which came pass my way. My bluetooth doesn't work. It seems to be switched on, but when I check my system settings the button is actually off, and I can't drag it 'perminently' to the 'on' position. Tried a couple of commands I found on the net, none of them helped and there was no word whatsoever in my BIOS settings about enabling bluetooth. My card reader has some serious problems with copying more than one file at a time. I tried to put some music on my phone through a MicroSD card adapter (because my bluetooth doesn't work) and it got stuck every single time I copied an album on it. I'm not sure if all my drivers were properly installed, so I checked in the terminal if it could tell me sth about my graphics. typed: sudo lshw -c display and what i got was: *-display UNCLAIMED description: VGA compatible controller product: NVIDIA Corporation vendor: NVIDIA Corporation physical id: 0 bus info: pci@0000:01:00.0 version: a1 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress vga_controller cap_list configuration: latency=0 resources: memory:b2000000-b2ffffff memory:a0000000-afffffff memory:b0000000-b1ffffff ioport:2000(size=128) *-display description: VGA compatible controller product: Ivy Bridge Graphics Controller vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 version: 09 width: 64 bits clock: 33MHz capabilities: msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0 resources: irq:44 memory:b3000000-b33fffff memory:c0000000-cfffffff ioport:3000(size=64) As I said I'm no expert and not english-speaking generally, but it doesn't seem to be right. I've got a NVIDIA GeForce GT 640M.

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• QA & Testing with UPK

  - by dan.gallo(at)oracle.com

  Most customers know that UPK produces both the word and excel based test scripts for UAT. Did you know that you can use UPK for QA review and bug tracking? To use UPK for QA, create content and assign it appropriately to authorized reviewers. Then have them open the developer, use customized views to find content assigned to them quickly and check out the topics. Then they can use the topic editor to review the content and provide comments right into the bubbles or use explanation frames. It makes QA-ing content this way easier than publishing and sending out .tpcs or docs for people to review. How about UPK for bug tracking? The hardest part about fixing bugs in software is reproducing the error! When you use UPK for bug tracking, it captures the exact steps the user took that gave them the error. Now development can easily walk through the process in a simulated environment to see what might have caused it, they have a documented procedure for what generated the error and they are able to better communicate with the LOB. Also, they can update or attach the simulation\documentation to any defect management software like bugzilla or something similar -all thanks to UPK.

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• Join our team at Microsoft

  - by Daniel Moth

  If you are looking for a SDE or SDET job at Microsoft, keep on reading. Back in January I posted a Dev Lead opening on our team, which was quickly filled internally (by Maria Blees). Our team is part of the recently announced Microsoft Technical Computing group. Specifically, we are working on new debugger functionality, integrated with Visual Studio (we are starting work on the next version), aimed to address HPC and GPGPU scenarios (and continuing the Parallel Debugging scenarios we started addressing with VS2010). We now have many more openings on our debugger team. We posted three of those on the careers website: Software Development Engineer Software Development Engineer II Software Development Engineer in Test II (don't let the word "Test" fool you: An SDET on our team is no different than a developer in any way, including the skills required) Please do read the contents of the links above. Specifically, note that for both positions you need to be as proficient in writing C++ code as you are with managed code (WPF experience is a plus). If you think you have what it takes, you wish to join a quality and schedule driven project, and want to contribute features to a product that has global impact, then send me your resume and I'll pass it on to the hiring managers. Comments about this post welcome at the original blog.

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• Wessty: Live with HTML 5 (2011 Speaker Tour)

  - by David Wesst

  That’s right: Wessty is on tour. Okay, the banner and the tour is a little over the top, but I am really excited about my upcoming speaking engagements to spread the word about HTML 5! I have already kicked off the tour with the Winnipeg Code Camp last weekend with the world premiere of HTML 5 for .NET Pro presentation, and the turn out fantastic. It was the last presentation of the day, but we still had some great questions about the new standard and got to see how HTML 5 can fit into .NET web applications today. In any case, above you can see the confirmed presentations that I will be doing so far in 2011, but there are a few more events that I have heard about that I hope to add to that list. Ultimately, expect that list to be updated over the course of the year as the year is young and there are plenty of conferences coming up! Presentation Resources As the tour continues, I will be posting the slides and the source code for the demonstrations up here on my site. They will be free of charge and give you the chance to review the demos and hopefully take advantage of some of the cool things you see in the presentations. Become part of the Tour If you are considering hosting an event where you think that HTML 5 could use a voice, drop me a line and let me know. I am always looking for opportunities to grow the tour to talk not just about HTML 5, but a variety of topics that relate to user interface and user experience development. This post also appears at http://david.wes.st

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• Recovering data from /

  - by Abhijit Gavas

  I accidentally installed Ubuntu to one of my data drives from Windows. The drive was a NTFS drive and contained about 80 GB of important data. The size of the drive is 110 GB. Its new file system is ext4. In an attempt to recover the data, I downloaded foremost and tried the following commands: foremost -i / -o /media/281C8DB01C8D7998/Recovery/ -T -v foremost -i /dev/sda7 -o /media/281C8DB01C8D7998/Recovery/ -T -v (sda7 is the drive in question.) It appears that with either command, foremost gets stuck reading some file. Here is the console output: abhi@abi-PC:/dev$ foremost -i /dev/sda7 -o /media/281C8DB01C8D7998/Recovery/ -T -v Foremost version 1.5.7 by Jesse Kornblum, Kris Kendall, and Nick Mikus Audit File Foremost started at Fri Sep 28 20:58:00 2012 Invocation: foremost -i /dev/sda7 -o /media/281C8DB01C8D7998/Recovery/ -T -v Output directory: /media/281C8DB01C8D7998/Recovery_Fri_Sep_28_20_58_00_2012 Configuration file: /etc/foremost.conf Processing: stdin |------------------------------------------------------------------ File: stdin Start: Fri Sep 28 20:58:00 2012 Length: Unknown Num Name (bs=512) Size File Offset Comment Killed As you can see I have to kill it from system monitor. This approach does not seem to be working. What else could I try to recover the files? Please help. The files are very important and I will be devastated if I cannot recover them.

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• How will my Electronic Engineering degree be received in the Canadian Game Development market? [closed]

  - by Harikawashi

  I have a Electronic Engineering with Computer Science Degree from a reputable South African university. The EE with CS degree is basically Electronic Engineering, with some of the high voltage subjects thrown out and replaced with computer science subjects - mostly quite theoretical, but not in too much depth. I went on to earn a Masters Degree in Digital Signal Processing, focussing on Speech Recognition in Educational Applications. I have always loved programming - I taught myself QBASIC when I was in primary school, I learned Java at school, did some low level C at University, and taught myself C# and Python while doing my post graduate degree. C# is currently my strong suit, I think I am pretty capable with it. I have two years work experience in Namibia - working as a consulting electrical engineer (no software content whatsoever) and also developing C# desktop applications for the company I work for. I would like to move to Canada next year and work in the Game Development Industry as programmer or software engineer. My interests in particular are towards the more mathematical applications, like game and physics engines, or statistical disciplines like artificial intelligence. However, these are passions - not areas in which I have any work experience. So the question: How well will my BEngEE&CS and MScEng be received in the game industry? Seeing as it's not a pure software degree and I have no official software development work experience?

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• HTG Explains: What Are Computer Algorithms and How Do They Work?

  - by YatriTrivedi

    Unless you’re into math or programming, the word “algorithm” might be Greek to you, but it’s one of the building blocks of everything you’re using to read this article. Here’s a quick explanation of what they are, and how they work. Disclaimer: I’m not a math or computer science teacher, so not all of the terms I use are technical. That’s because I’m trying to explain everything in plain English for people aren’t quite comfortable with math. That being said, there is some math involved, and that’s unavoidable. Math geeks, feel free to correct or better explain in the comments, but please, keep it simple for the mathematically disinclined among us. Image by Ian Ruotsala Latest Features How-To Geek ETC How To Make Hundreds of Complex Photo Edits in Seconds With Photoshop Actions How to Enable User-Specific Wireless Networks in Windows 7 How to Use Google Chrome as Your Default PDF Reader (the Easy Way) How To Remove People and Objects From Photographs In Photoshop Ask How-To Geek: How Can I Monitor My Bandwidth Usage? Internet Explorer 9 RC Now Available: Here’s the Most Interesting New Stuff Lucky Kid Gets Playable Angry Birds Cake [Video] See the Lord of the Rings Epic from the Perspective of Mordor [eBook] Smart Taskbar Is a Thumb Friendly Android Task Launcher Comix is an Awesome Comics Archive Viewer for Linux Get the MakeUseOf eBook Guide to Speeding Up Windows for Free Need Tech Support? Call the Star Wars Help Desk! [Video Classic]

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• Expanding existing DVCS Wiki

  - by A Lion

  A portion of my job is to maintain technical documentation for a rapidly expanding manufacturing company. Because it is only a portion of my job and the company's product line is expanding so quickly, I can't stay on top of the documentation. As a result, I've been yearning for an information management system with a handful of specific features. I've found many products that have a subset, but none that have all the features I'm looking for. I'm at the point of picking an existing product and expanding it to cover my desired feature set, however, this will be a pet project and I will be learning the underlying language as I go. So, the main question is which existing product will be the easiest to expand to cover the full feature set and has a relatively easy to learn language? Alternatively, have I missed another existing program that will cover the feature set or should be in my list of "close, but not quite there"? Feature Set web interface based on a distributed version control system (e.g., git) easy to edit by logged in novices (e.g. wiki, multimarkdown) outputs in more traditional formats (e.g., doc, odt, pdf) edits held in queue until editor/engineer/manager approves them (e.g., MS Word editing) [this is the really big elephant in list - suggestions on where to start appreciated] edits held in queue specifically for engineer approval [extra limb of the elephant in the list] well-supported in the open source community Closest, but not quite there ikiwiki - http://ikiwiki.info (php) lots of awesome functionality and extensions, including easy to edit and based on DVCS lacks a review/forward for review queue appears to be well-supported within the OSS community gitit - http://gitit.net/ (haskell) easy to edit and based on DVCS lots of outputs in traditional formats a great web-based gui diff interface lacks a review/forward for review queue appears to be primarily maintained by one individual

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• Finding the shortest path through a digraph that visits all nodes

  - by Boluc Papuccuoglu

  I am trying to find the shortest possible path that visits every node through a graph (a node may be visited more than once, the solution may pick any node as the starting node.). The graph is directed, meaning that being able to travel from node A to node B does not mean one can travel from node B to node A. All distances between nodes are equal. I was able to code a brute force search that found a path of only 27 nodes when I had 27 nodes and each node had a connection to 2 or 1 other node. However, the actual problem that I am trying to solve consists of 256 nodes, with each node connecting to either 4 or 3 other nodes. The brute force algorithm that solved the 27 node graph can produce a 415 node solution (not optimal) within a few seconds, but using the processing power I have at my disposal takes about 6 hours to arrive at a 402 node solution. What approach should I use to arrive at a solution that I can be certain is the optimal one? For example, use an optimizer algorithm to shorten a non-optimal solution? Or somehow adopt a brute force search that discards paths that are not optimal? EDIT: (Copying a comment to an answer here to better clarify the question) To clarify, I am not saying that there is a Hamiltonian path and I need to find it, I am trying to find the shortest path in the 256 node graph that visits each node AT LEAST once. With the 27 node run, I was able to find a Hamiltonian path, which assured me that it was an optimal solution. I want to find a solution for the 256 node graph which is the shortest.

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• Restoring GRUB2 on Software RAID 0 using LiveCD after Windows 7 wiped it

  - by unknownthreat

  I have installed Ubuntu 10.10 on my system. However, I need to install Windows 7 back, and I expect that it would alter GRUB and it did. Right now, my partition on my Software RAID 0 looks like this: nvidia_acajefec1 is Ubuntu 10.10 and nvidia_acajefec3 is Windows 7. I've been following some guides around and I am always stuck at GRUB not able to detect the usual RAID content. I've tried running: sudo grub > root (hd0,0) GRUB complains it couldn't find my hard disk. So I tried: find (hd0,0) And it complains that it couldn't find anything. So I tried: find /boot/grub/stage1 It said "file not found". Here's the text from the console: ubuntu@ubuntu:~$ grub Probing devices to guess BIOS drives. This may take a long time. [ Minimal BASH-like line editing is supported. For the first word, TAB lists possible command completions. Anywhere else TAB lists the possible completions of a device/filename. ] grub> root (hd0,0) root (hd0,0) Error 21: Selected disk does not exist grub> find /boot/grub/stage1 find /boot/grub/stage1 Error 15: File not found Fortunately, I got one person suggesting that what I've been trying to do is for GRUB Legacy, not GRUB2. So I went to the suggested website, ** (http://grub.enbug.org/Grub2LiveCdInstallGuide) **try to look around, and try: ubuntu@ubuntu:~$ sudo fdisk -l Unable to seek on /dev/sda This is just the step 2 of the instruction in the http://grub.enbug.org/Grub2LiveCdInstallGuide and I cannot proceed because it cannot seek /dev/sda. However, ubuntu@ubuntu:~$ sudo dmraid -r /dev/sdb: nvidia, "nvidia_acajefec", stripe, ok, 488397166 sectors, data@ 0 /dev/sda: nvidia, "nvidia_acajefec", stripe, ok, 488397166 sectors, data@ 0 So what now? Do you have an idea for how to make fdisk see my RAID array on live cd (Ubuntu 10.10)? Honestly, I am lost, very lost in trying to restore GRUB2 on this software RAID 0 system right now.

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• Create Pivot collections much faster than DeepZoomTools CollectionCreator class

  - by John Conwell

  I've been playing with Microsoft Live Labs Pivot to create a hierarchy of collections all linked together to allow someone to explore a hierarchy of data visually. The problem has been the generation time of the entire hierarchy. I end up creating 500 - 600 collections total and it takes hours and hours using the CollectionCreator class that comes with the DeepZoomTools.  So digging around I found a way to make the actual DeepZoom collection creation wicked fast. Dont use the CollectionCreator!  Turns out Pivot doesnt actually use the image pyramid generated by the CollectionCreator. Or if it does, its only when you open a new collection it shows all the images zooming in. But once the zoom in is complete, Pivot uses the individual DeepZoom images. What Pivot does need is the xml generated by the CollectionCreator, which is in a very simple format.  So what i did was manually generate the xml for the collection image pyramid, and then create the folder structure required (one folder per level of the pyramid), and put a single pixel png file in each folder.  Now, I can create the required files and folders for 500 collections in about 10 seconds. Sweet! Now you still have to use the ImageCreator to create a DeepZoom image for each image in the collection and that still takes some time, but at least the total processing time is way better.

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• Using the Java SE 8 Date Time API with JPA 2.1

  - by reza_rahman

  Most of you are hopefully aware of the new Date Time API included in Java SE 8. If you are not, you should check them out right now using the Java Tutorial Trail dedicated to the topic. It is a significantly leap forward in processing temporal data in Java. For those who already use Joda-Time the changes will look very familiar - very simplistically speaking the Java SE 8 feature is basically Joda-Time standardized. Quite naturally you will likely want to use the new Date Time APIs in your JPA domain model to better represent temporal data. The problem is that JPA 2.1 will not support the new API out of the box. So what are you to do? Fortunately you can make use of fairly simple JPA 2.1 Type Converters to use the Date Time API in your JPA domain classes. Steven Gertiser shows you how to do it in an extremely well written blog entry. Besides explaining the problem and the solution the entry is actually very good for getting a better understanding of JPA 2.1 Type Converters as well. I think such a set of converters may be a good fit for Apache DeltaSpike as a Java EE 7 extension? In case you are wondering about Java SE 8 support in the JPA specification itself, Nick Williams has already entered an excellent, well researched JIRA entry asking for such support in a future version of the JPA specification that's well worth looking at. Another possibility of course is for JPA providers to start supporting the Date Time API natively before anything is formalized in the specification. What do you think?

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• Is this an acceptable approach to undo/redo in Python?

  - by Codemonkey

  I'm making an application (wxPython) to process some data from Excel documents. I want the user to be able to undo and redo actions, even gigantic actions like processing the contents of 10 000 cells simultaneously. I Googled the topic, and all the solutions I could find involves a lot of black magic or is overly complicated. Here is how I imagine my simple undo/redo scheme. I write two classes - one called ActionStack and an abstract one called Action. Every "undoable" operation must be a subclass of Action and define the methods do and undo. The Action subclass is passed the instance of the "document", or data model, and is responsible for committing the operation and remembering how to undo the change. Now, every document is associated with an instance of the ActionStack. The ActionStack maintains a stack of actions (surprise!). Every time actions are undone and new actions are performed, all undone actions are removed for ever. The ActionStack will also automatically remove the oldest Action when the stack reaches the configurable maximum amount. I imagine the workflow would produce code looking something like this: class TableDocument(object): def __init__(self, table): self.table = table self.action_stack = ActionStack(history_limit=50) # ... def delete_cells(self, cells): self.action_stack.push( DeleteAction(self, cells) ) def add_column(self, index, name=''): self.action_stack.push( AddColumnAction(self, index, name) ) # ... def undo(self, count=1): self.action_stack.undo(count) def redo(self, count=1): self.action_stack.redo(count) Given that none of the methods I've found are this simple, I thought I'd get the experts' opinion before I go ahead with this plan. More specifically, what I'm wondering about is - are there any glaring holes in this plan that I'm not seeing?

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