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• Raid 5 mdadm Problem - Help Please

  - by user66260

  My Raid 5 array (4 1tb Disks WD10EARS) had was showing as degraded. I looked and one of the disks wasnt installed, so i re-added it with the mdadm add command. the array is now showing as (null)Array , but cant be mounted if i run: root@warren-P5K-E:/home/warren# sudo mdadm --misc --detail /dev/md0 I get: mdadm: cannot open /dev/md0: No such file or directory and running: root@warren-P5K-E:/home/warren# cat /proc/mdstat gives me: Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] unused devices: < none > The data is very important root@warren-P5K-E:/home/warren# mdadm --examine /dev/sda /dev/sda: Magic : a92b4efc Version : 0.90.00 UUID : 00000000:00000000:00000000:00000000 Creation Time : Sat May 26 12:08:14 2012 Raid Level : -unknown- Raid Devices : 0 Total Devices : 4 Preferred Minor : 0 Update Time : Sat May 26 12:08:40 2012 State : active Active Devices : 0 Working Devices : 4 Failed Devices : 0 Spare Devices : 4 Checksum : 82d5b792 - correct Events : 1 Number Major Minor RaidDevice State this 1 8 0 1 spare /dev/sda 0 0 8 16 0 spare /dev/sdb 1 1 8 0 1 spare /dev/sda 2 2 8 32 2 spare /dev/sdc 3 3 8 48 3 spare /dev/sdd root@warren-P5K-E:/home/warren# mdadm --examine /dev/sdb /dev/sdb: Magic : a92b4efc Version : 0.90.00 UUID : 00000000:00000000:00000000:00000000 Creation Time : Sat May 26 12:08:14 2012 Raid Level : -unknown- Raid Devices : 0 Total Devices : 4 Preferred Minor : 0 Update Time : Sat May 26 12:08:40 2012 State : active Active Devices : 0 Working Devices : 4 Failed Devices : 0 Spare Devices : 4 Checksum : 82d5b7a0 - correct Events : 1 Number Major Minor RaidDevice State this 0 8 16 0 spare /dev/sdb 0 0 8 16 0 spare /dev/sdb 1 1 8 0 1 spare /dev/sda 2 2 8 32 2 spare /dev/sdc 3 3 8 48 3 spare /dev/sdd root@warren-P5K-E:/home/warren# oot@warren-P5K-E:/home/warren# mdadm --examine /dev/sdc /dev/sdc: Magic : a92b4efc Version : 0.90.00 UUID : 00000000:00000000:00000000:00000000 Creation Time : Sat May 26 12:08:14 2012 Raid Level : -unknown- Raid Devices : 0 Total Devices : 4 Preferred Minor : 0 Update Time : Sat May 26 12:08:40 2012 State : active Active Devices : 0 Working Devices : 4 Failed Devices : 0 Spare Devices : 4 Checksum : 82d5b7b4 - correct Events : 1 Number Major Minor RaidDevice State this 2 8 32 2 spare /dev/sdc 0 0 8 16 0 spare /dev/sdb 1 1 8 0 1 spare /dev/sda 2 2 8 32 2 spare /dev/sdc 3 3 8 48 3 spare /dev/sdd root@warren-P5K-E:/home/warren# mdadm --examine /dev/sdd /dev/sdd: Magic : a92b4efc Version : 0.90.00 UUID : 00000000:00000000:00000000:00000000 Creation Time : Sat May 26 12:08:14 2012 Raid Level : -unknown- Raid Devices : 0 Total Devices : 4 Preferred Minor : 0 Update Time : Sat May 26 12:08:40 2012 State : active Active Devices : 0 Working Devices : 4 Failed Devices : 0 Spare Devices : 4 Checksum : 82d5b7c6 - correct Events : 1 Number Major Minor RaidDevice State this 3 8 48 3 spare /dev/sdd 0 0 8 16 0 spare /dev/sdb 1 1 8 0 1 spare /dev/sda 2 2 8 32 2 spare /dev/sdc 3 3 8 48 3 spare /dev/sdd That on the 4 drives.

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• Merge\Combine two datatables

  - by madlan

  I'm trying to merge\combine two datatables. I've looked at various examples and answers but they seem to create duplicate rows or require indexes (merge on datatable etc) I can't do this via SQL as one source is from a linked Oracle server accessed via MSSQL and the other from a different MSSQL Server that does not have linked access. The data is currently very simple: Name, Email, Phone DataTable1: "John Clark", "", "01522 55231" "Alex King", "[email protected]", "01522 55266" "Marcus Jones", "[email protected]", "01522 55461" DataTable2: "John Clark", "[email protected]", "01522 55231" "Alex King", "[email protected]", "" "Marcus Jones", "[email protected]", "01522 55461" "Warren bean", "warren[email protected]", "01522 522311" Giving a datatable with the following: "John Clark", "[email protected]", "01522 55231" "Alex King", "[email protected]", "01522 55266" "Marcus Jones", "[email protected]", "01522 55461" "Warren bean", "warren[email protected]", "01522 522311" Name is the field to match records on, with the first datatable taking priority.

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• Where can I ask web design questions of a more amateur nature?

  - by Warren van Rooyen

  I don't want to bother pro web designers with simple questions as I see most of the questions here are quite technical. An example would be, 'I have a template I've downloaded. The folder contains a css folder and PHP files. How would I bring this into Dreamweaver?' It's unfortunately in a space between what I'd be able to find on Google and asking here without feeling like a hinderance for those who don't want to answer such simple questions. Thanks, Warren.

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• Webcast: June 29th at 11am Eastern - Optimize ePermitting Reviews & Approvals with AutoVue

  - by Warren Baird

  I'm pleased to announce that the Enterprise Visualization special interest group (SIG) is organizing it's first webcast on June 29th - Palm Beach County is going to present how they use AutoVue as part of their e-permitting processes.  This is a must-see for anyone in the Public Sector, but even for people who aren't in the Public Sector, it should be very interesting to see how Palm Beach County has tied AutoVue tightly into their business processes.If you haven't already done so, I'd suggest joining up for our SIG at http://groups.google.com/group/enterprise_visualization_sig.The registration link for the webcast is: https://www3.gotomeeting.com/register/565294190 - more details are below:The Enterprise Visualization Special Interest Group (EVSIG) is proud to present the first in a series of webcasts designed to educate the AutoVue user community on innovative and compelling AutoVue solutions.  Attend the Webcast and discover how AutoVue can make building permit application and approval processes more efficient.Presenters:Oracle: Warren Baird, Principal Product Manager, AutoVue Enterprise VisualizationPalm Beach County: Paul Murphy, Systems IntegratorLaura Yonkers, Permit Section SupervisorChuck Lemon, Project Business AnalystAbstract:In their efforts to deliver better services to citizens, save money and “think green”, many cities, states and local governments have implemented online e-permitting processes that allow developers and citizens to apply for and receive building permits via the Web.Attend this webcast and discover how AutoVue visualization solutions enhance ePermitting processes by streamlining the review and approval of digital permit applications.  Hear from Palm Beach County about how they leveraging AutoVue within their ePermitting system to:·         provide structure to the land development review and approval process·         accelerate and improve efficiency throughout the permitting process·         decrease permit review times·         increase the level of transparency during the permit application and review process·         improve accountability in the organization·         improve citizen services by providing 24-7 ability to submit and track applicationsSign up for the Enterprise Visualization SIG to learn about future AutoVue Webcasts. Register today at http://groups.google.com/group/enterprise_visualization_sig and become a part of our growing online user community. We look forward to seeing you on the 29th of June.

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• Five Point Partners Reviews Oracle Utilities Mobile Workforce Management 2.0

  - by caroline.yu

  Oracle recently provided Five Point Partners, Research and Analysis Division's Warren B. Causey and Bart Thielbar a one-hour briefing of Oracle Utilities Mobile Workforce Management 2.0. Based on that briefing, Warren and Bart provided an evaluation of the new software. The review notes that this is the first major rewrite of a mobile system. Oracle Utilities has made numerous updates in structure, architecture and functionality to the software that should well-position Oracle Utilities Mobile Workforce Management 2.0 for the current utility market. Additionally, the reviewers noted that one of the most significant improvements in the new version of Oracle Utilities Mobile Workforce Management is that it has moved to the same Java technical stack of other Oracle Utilities products. Utilities can deploy the software in multiple environments including Linux, Unix and Windows. This will simplify integration with existing Oracle products, as well as with other systems, thus potentially lowering cost of installation and ownership for utilities. Overall, Warren and Bart note that Oracle Utilities now has an impressive, state-of-the-art mobile workforce management system that utilities can readily deploy in a bundle with other Oracle solutions, or use as a stand-alone system with relatively easy integration to other utility systems. They state that Oracle Utilities Mobile Workforce Management 2.0 should significantly strengthen Oracle's competitive position in the mobile workforce management solution space. To take a look at the full review, click here.

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• Re-enabling audio on an iMac

  - by Warren Seine

  Hello guys, I know Super User is not a 'tech support' forum, so I will try to make it short: my computer's sound does not work anymore. I have asked for support on the Apple board but I feel a bit on my own. To summarize, the Sound Panel of my iMac does not display any outgoing channel (headphones or internal speakers). It does not work on Windows either. Contrary to what it may seem, I have the feeling that it is not a hardware issue (and that GarageBand is somehow interfering). If you have an idea to solve the problem, please share. Making it work again is a lost cause without sending it back to Apple, so the question I'm asking is: What is the best workaround (cheap Firewire sound card?) for getting my sound back? Thanks.

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• jQuery.load() Retrieving partial page content causes duplicate ID in DOM

  - by Warren Buckley

  Hello all, I currently have a JS function that allows me to load partial content from another page into the current page using jQuery.load() However I noticed when using this that I get a duplicate ID in the DOM (when inspecting with FireBug) This function is used in conjuction with a Flash Building viewe so it does not contain any code to retrieve the URL from the anchor tag. function displayApartment(apartmentID) { $("#apartmentInfo").load(siteURL + apartmentID + ".aspx #apartmentInfo", function () { //re-do links loaded in $("a.gallery").colorbox({ opacity: "0.5" }); }); } The code above works just fine in retrieving the content, however it just bugs me that when inspecting with firebug I get something like this. <div id="apartmentInfo"> <div id="apartmentInfo"> <!-- Remote HTML here..... --> </div> </div> Can anyone please suggest anything on how to remove the duplicate div? Thanks, Warren

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• New Walkthrough Capability in AutoVue 20

  - by warren.baird

  New in AutoVue 20 is the capability to view a 3D model of a building from the inside - this is a very powerful tool for anyone who needs to work with models of plants, refineries, or other buildings. All of the standard AutoVue functionality is available, so you can click on any part of the building to get attribute data, manipulate the view, do measurement, etc. For example, in the image below we've made the Architectural model (Walls, Floors, etc.) transparent, but left the electrical and mechanical models opaque, so it's easy to see where the wires and piping run behind the walls. Additionally you can bring together different files and different types of files, using our digital mockup capability - in the image below the heating and air conditioning sytem on the left came from one file, and the electrical box on the right came from another wile, and the model of the room came from yet a third file, but with everything brought together into AutoVue you can do things like use our measurement capability to ensure there's enough space to get maintenance equipment down the hallway, before the building is even built. For more information about Walkthrough, you can view a video demo at http://download.oracle.com/autovue/3D_walkthrough_movie.wmv We're very excited about this new capability - do you think this will be useful for you in your work with AutoVue? Let us know!

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• AutoVue at AIIM expo

  - by warren.baird

  Myself and a few other people from the AutoVue team will be at the #AIIM "info360" conference in Philadelphia next week. If you are attending, let me know, or come by the Oracle booth to say hello!

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• Using an Apt Repository for Paid Software Updates

  - by Scott Warren

  I'm trying to determine a way to distribute software updates for a hosted/on-site web application that may have weekly and/or monthly updates. I don't want the customers who use the on-site product to have to worry about updating it manually I just want it to download and install automatically ala Google Chrome. I'm planning on providing an OVF file with Ubuntu and the software installed and configured. My first thought on how to distributed software is to create six Apt repositories/channels (not sure which would be better at this point) that will be accessed through SSH using keys so if a customer doesn't renew their subscription we can disable their account: Beta - Used internally on test data to check the package for major defects. Internal - Used internally on live data to check the package for defects (dog fooding stage). External 1 - Deployed to 1% of our user base (randomly selected) to check for defects. External 9 - Deployed to 9% of our user base (ramdonly selected) to check for defects. External 90 - Deployed to the remaining 90% of users. Hosted - Deployed to the hosted environment. It will take a sign off at each stage to move into the next repository in case problems are reported. My questions to the community are: Has anyone tried something like this before? Can anyone see a downside to this type of a procedure? Is there a better way?

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• CIC 2010 - Ghost Stories and Model Based Design

  - by warren.baird

  I was lucky enough to attend the collaboration and interoperability congress recently. The location was very beautiful and interesting, it was held in the mountains about two hours outside Denver, at the Stanley hotel, famous both for inspiring Steven King's novel "The Shining" and for attracting a lot of attention from the "Ghost Hunters" TV show. My visit was prosaic - I didn't get to experience the ghosts the locals promised - but interesting, with some very informative sessions. I noticed one main theme - a lot of people were talking about Model Based Design (MBD), which is moving design and manufacturing away from 2d drawings and towards 3d models. 2d has some pretty deep roots in industrial manufacturing and there have been a lot of challenges encountered in making the leap to 3d. One of the challenges discussed in several sessions was how to get model information out to the non-engineers in the company, which is a topic near and dear to my heart. In the 2D space, people without access to CAD software (for example, people assembling a product on the shop floor) can be given printouts of the design - it's not particularly efficient, and it definitely isn't very green, but it tends to work. There's no direct equivalent in the 3D space. One of the ways that AutoVue is used in industrial manufacturing is to provide non-CAD users with an easy to use, interactive 3D view of their products - in some cases it's directly used by people on the shop floor, but in cases where paper is really ingrained in the process, AutoVue can be used by a technical publications person to create illustrative 2D views that can be printed that show all of the details necessary to complete the work. Are you making the move to model based design? Is AutoVue helping you with your challenges? Let us know in the comments below.

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• Trying to use HUAWEI E173 on Ubuntu 12.04

  - by Scott Warren

  I have a HUAWEI E173 usb stick to access the internet. It works normally on windows but I need to use it on my Ubuntu system. I plug it in, and after 25-20 seconds the status light turns green and blinks twice every 3 seconds. I see no changes in my system whatsoever, nothing gets installed, I don't get prompted for my PIN. I tried to create a connection using edit connections. I entered the following parameters: Turkey, Turkcell, My Plan is not listed, Internet. Nothing happens. I tried the lsusb command and got the following: tosh2000@tosh:~$ lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 002: ID 058f:a001 Alcor Micro Corp. Bus 001 Device 004: ID 12d1:14ba Huawei Technologies Co., Ltd. I tried the usb-devices command and can see the device: T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 4 Spd=480 MxCh= 0 D: Ver= 2.00 Cls=00(ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=12d1 ProdID=14ba Rev=00.00 S: Manufacturer=HUAWEI Technology S: Product=HUAWEI Mobile C: #Ifs= 2 Cfg#= 1 Atr=e0 MxPwr=500mA I: If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage I: If#= 1 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage Based on other advice I found, I tried the following command: sudo modprobe usbserial vendor=0x12d1 product=0x14ba Again, nothing happened. My question is why does the "enable mobile broadband" not populate automatically in the dropdown networking menu and how can I can I start using the device? Thank you.

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• AutoVue for Mobile Asset Management

  - by Warren Baird

  Our partner VentureForth is working with us on a solution to use AutoVue in their mobile asset management system. The idea is to allow workers in the field to easily be able to access visual information they might need while doing their work - and to annotate them.   For instance the worker can take a photo of something unexpected they found on-site, and indicate on the drawing what they found, so there's a record of it for the future.VentureForth's vMobile suite allows workers to take information for EBS eAM and PeopleSoft CAM, as well as multiple other systems) offline with them while working in the field, and with the AutoVue integration the workers can then view and annotate CAD drawings or photographs and have that information saved back into the asset management system.VentureForth has posted a video of this in action on YouTube:  http://youtu.be/X5Lv_X2v7uc - Check it out and let us know what your thoughts are!Learn more about VentureForth at http://ventureforth.com/

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• WiFi not working on Dell Inspiron 1564

  - by Zack Warren

  hope you can offer some help! I'm new to Ubuntu (and Linux for that matter), but I managed to install Ubuntu 12.04 yesterday on an old Dell Inspiron 1564 Laptop. Everything works fine, with the exception of the wireless connection. Using my wired ethernet, I was able to look up several solutions which seemed as if they would work, but I've had no luck. Currently, wireless does show as enabled, but all wireless networks are disconnected, in fact, none of the networks are even listed (and I can see them on other devices in the home). Let me know what you need to help me! Thanks in advance!

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• Why isn't my monitor's native resolution appearing as an option?

  - by Warren Pena

  I'm on a clean install of Ubuntu 10.04 LTS. My monitor's native resolution is 1280x1024. However, in the Monitor Preferences application, I am only presented with 640x480 and 800x600 as options. My video card is an on board Matrox G200eW. I tried installing the proprietary driver from Matrox's website, but the installer immediately throws four errors. I also tried using xrandr to set my resolution, but it simply pops back saying "Size 1280x1024 not found in available modes." How can I get 1280x1024 added to my available sizes to that I can switch to it?

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• AutoCad 2011 support available for AutoVue 20.0!

  - by warren.baird

  I'm happy to announce that support for AutoCad 2011 has been released for AutoVue 20.0. The support is available as a patch on My Oracle Support. To find the patch, visit https://support.oracle.com and click on the 'Patches & Updates' tab at the top of the screen. In the Patch Search area, enter patch # 9576064 and click search, then click on the patch # and click 'download'. Let us know how it works for you!

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• Hotspotting - tying Visualization into Other applications

  - by warren.baird

  AutoVue 20 included our first step towards providing a rich hotspotting capability that will allow visualization capabilities to be very tightly integrated into a wide range of applications. The idea is to have a close link between the visual representation of an object or place, and the business objects associated with that object or place. We've been working with our partner Enigma to enable this capability in their parts catalogue - the screenshot above shows what it looks like - the image on the right is a trimmed down version of AutoVue displaying a drawing of the various parts in an interactive way - when you click on item '6' in the AutoVue drawing, the appropriate item is highlighted in the parts catalogue - making it easy to select the parts you need, and to ensure that the correct parts are selected. The integration works in both directions - when you select a part in the part catalogue, the appropriate part is highlighted in the drawing as well. To get slightly technical for a moment, this is a simple javascript integration - the external application provides a javascript callback that AutoVue calls whenever an item is clicked on, and AutoVue provides a javascript function to call when an item is selected in the external application. There are also direct java APIs available. This makes it easy to tie AutoVue into many types of applications - you can imagine in an asset lifecycle management application being able to click on the appropriate asset in a drawing to create a work-order, instead of finding the right asset ID to enter. Or being able to click on a part or sub-assembly to trigger a change order in a product lifecycle management application. We're pretty excited about the possibilities that this capability opens up, and plan on expanding on it a lot in the future. Would this be useful in your enterprise applications? What kinds of integrations like this would be useful for you? Let us know in the comments below!

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• Why does Ubuntu Download recommend 32-bit install?

  - by Warren Pena

  The Ubuntu desktop download screen has a pair of radio buttons you use to select whether you wish to download the 32-bit or 64-bit version. The 64-bit version is labeled "Not recommended for daily desktop usage." If you have a 64-bit processor, why would you not want to use the 64-bit version of Ubuntu? Update for 10.10: They've removed the "Not recommended" label from the 64-bit version and added a "Recommended" label to the 32-bit version. Update for 11.04: Same as 10.10. Update for 12.04: Still says "Recommended" next to 32-bit version of desktop

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• Smallest netbook that runs Ubuntu?

  - by Warren P

  I am looking for an ubuntu netbook that is very small. If possible, the size of the hp 95lx. If anybody remembers those old DOS, or Windows CE devices, that were basically calculator size, with keyboards, I'm sure you can see what I mean. I am aware of pandora and it seems nearly perfect (if you settle for running its custom LInux instead of ubuntu), but as it's a small privately produced unit, and not currently commercially available, I'm looking for something that IS available now in north america.

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• Using an Apt Repository for Paid Software Updates

  - by Scott Warren

  I'm trying to determine a way to distribute software updates for a hosted/on-site web application that may have weekly and/or monthly updates. I don't want the customers who use the on-site product to have to worry about updating it manually I just want it to download and install automatically ala Google Chrome. I'm planning on providing an OVF file with Ubuntu and the software installed and configured. My first thought on how to distributed software is to create six Apt repositories/channels (not sure which would be better at this point) that will be accessed through SSH using keys so if a customer doesn't renew their subscription we can disable their account: Beta - Used internally on test data to check the package for major defects. Internal - Used internally on live data to check the package for defects (dog fooding stage). External 1 - Deployed to 1% of our user base (randomly selected) to check for defects. External 9 - Deployed to 9% of our user base (randomly selected) to check for defects. External 90 - Deployed to the remaining 90% of users. Hosted - Deployed to the hosted environment. It will take a sign off at each stage to move into the next repository in case problems are reported. My questions to the community are: Has anyone tried something like this before? Can anyone see a downside to this type of a procedure? Is there a better way?

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• What expectation should I have of South African web development rates / duration? [closed]

  - by Warren van Rooyen

  I am a developer but only intend on doing the front-end work for getting Reddit-like upvote / downvote functionality going on an upcoming site I'm building. I have never had to contract a developer for back-end work to implement code for me so I am quite in the dark on how much I should expect to pay and how long it could take to get the site going. I could be taken for a ride as the developer could distort the time it would take at a seemingly regular rate (hourly/day) or could otherwise distort their rate. Please could you give me help on this. I know you need some guidance on the nature of the site so here it is. I have a Reddit type template with CSS and PHP included. I then downloaded Pligg code that's intended to do the job of the Reddit upvote downvote functionality. How long would a developer roughly need to unite the theme and front end with the back-end functionality? I do understand it's not a lot of info but I'm sure you're experienced enough to have an instinct for the size of the project. Also, should I work on an hourly/day rate/ project payment agreement?

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• AutoVue for Agile 20.2.2 Now Available!!

  - by Warren Baird

  We are happy to announce that AutoVue for Agile 20.2.2 is now available via the Oracle Software Delivery Cloud.   AutoVue for Agile 20.2.2 is a minor release within the 20.2 product family that is specifically targeted for users of Agile PLM 9. AutoVue 20.2.2 brings a number of improvements, including support for SolidWorks 2013, AutoCAD and Inventor 2014, SolidEdge ST5, and Cadence Allegro 16.6.   It also includes support for Adobe Illustrator CS4 and up.   Another improvement involves bringing our support for Oracle Linux and Java Virtual Machine versions in-line with Agile's support. Please see our previous post (https://blogs.oracle.com/enterprisevisualization/entry/autovue_20_2_2_is) for more details on the specifics introduced in AutoVue 20.2.2. Agile PLM 9.3.3 has also been released, which as part of its many improvements introduces support for associating AutoVue annotations with change request objects in Agile, and a preliminary solution using Augmented Business Visualization to allow the creation of change objects from within AutoVue.   Please see the Agile Transfer of Information sessions in the KM note 1589164.1 for more details. We will provide additional posts over the next couple of weeks providing more details on these improvements.  Until then, if you have any questions, let us know in the comments! 

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• Ambiguous reference when getter/setter have different visibilities

  - by Warren Seine

  The following code raises an ambiguous reference to value at compile time: import flash.display.Sprite; public class Main extends Sprite { private var _value : Number = 0.; public function get value() : Number { return _value; } private function set value(v : Number) : void { _value = v; } public function Main() : void { value = 42.; } } I suspect some kind of bug in the compiler, though I didn't actually read the ECMA standard. Before someone asks those questions: Private setters do make sense. The ambiguity also exists with custom namespaces (which is the problem I'm facing).

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• Macro to improve callback registration readability

  - by Warren Seine

  I'm trying to write a macro to make a specific usage of callbacks in C++ easier. All my callbacks are member functions and will take this as first argument and a second one whose type inherits from a common base class. The usual way to go is: register_callback(boost::bind(&my_class::member_function, this, _1)); I'd love to write: register_callback(HANDLER(member_function)); Note that it will always be used within the same class. Even if typeof is considered as a bad practice, it sounds like a pretty solution to the lack of __class__ macro to get the current class name. The following code works: typedef typeof(*this) CLASS; boost::bind(& CLASS :: member_function, this, _1)(my_argument); but I can't use this code in a macro which will be given as argument to register_callback. I've tried: #define HANDLER(FUN) \ boost::bind(& typeof(*this) :: member_function, this, _1); which doesn't work for reasons I don't understand. Quoting GCC documentation: A typeof-construct can be used anywhere a typedef name could be used. My compiler is GCC 4.4, and even if I'd prefer something standard, GCC-specific solutions are accepted.

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• Force an object to be allocated on the heap

  - by Warren Seine

  A C++ class I'm writing uses shared_from_this() to return a valid boost::shared_ptr<>. Besides, I don't want to manage memory for this kind of object. At the moment, I'm not restricting the way the user allocates the object, which causes an error if shared_from_this() is called on a stack-allocated object. I'd like to force the object to be allocated with new and managed by a smart pointer, no matter how the user declares it. I thought it could be done through a proxy or an overloaded new operator, but I can't find a proper way of doing that. Is there a common design pattern for such usage? If it's not possible, how can I test it at compile time?

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