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• Not enough components to start the RAID array?

  - by urig

  I'm trying to retrieve data from a "Western Digital MyBook World Edition (white light)" NAS device. This is basically an embedded Linux box with a 1TB HDD in it formatted in ext3. It stopped booting one day for no apparent reason. I have extracted the HDD from the NAS device and installed it in a desktop machine running Ubuntu 10.10 in the hope of accessing the files on the drive. Unfortunately, Ubuntu has not been able to mount the drive automatically. Having started up Disk Utility I see the drive as a multi disk device called "Array (Array)" showing Metadata Version 0.90.0. The device state is: "Not Running, not enough components to start". When I click the "Start RAID Array" button I get an error saying: "Not enough components to start the RAID array". Can you please tell me which components are missing and how to install them to get access to the drive's filesystem?

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• JavaOne 2012: JDBC Community Discussion

  - by sowmya

  At JavaOne2012, Mark Biamonte of DataDirect Technologies and Lance Andersen of Oracle organized a discussion about JDBC. To learn more about using JDBC to develop database applications, see the JDBC trail in the Java Tutorials. You will know how to use the basic JDBC API to * create tables * insert values into them * query the tables * retrieve the results of the queries * update the tables In this process, you will learn how to use simple statements and prepared statements, and see an example of a stored procedure. You will also learn how to perform transactions and how to catch exceptions and warnings. - Sowmya

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• Get and set accessors do they protect different instances of a variable?

  - by Chris Halcrow

  The standard method of implementing get and set accessors in C# and VB.NET is to use a public property to set and retrieve the value of a corresponding private variable. Am I right in saying that this has no effect of different instances of a variable? By this I mean, if there are different instantiations of an object, then those instances and their properties are completely independent right? So I think my understanding is correct that setting a private variable is just a construct to be able to implement the get and set pattern? Never been 100% sure about this.

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• The Properties dialog box not working for any Start Menu Program Lubuntu 14.04

  - by user236378

  When Lubuntu 14.04 first came out, the Properties dialog was present for all Start Menu Programs but did not work when right-clicked on as nothing happened and no other box popped up the the Start Menu Program information, such as the executable info, etc. Then the issue was fixed. Now the issue has returned when I upgraded to Lubuntu 14.04.1. Is there any way to retrieve the Properties info pop-up box via a configuration file? Does the issue have to do with a faulty LXShortcut? I noticed when I uninstalled the LXShortcut the Properties tab disappeared. When I re-installed the Properties tab returned however once again when you right-click on the Properties tab nothing happens. Any assistance would be greatly appreciated. Thank you.

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• Returning multiple results from one row [migrated]

  - by krock

  I have a set of MySQL data similar to the following: | id | type | start | end | ============================================= | 1 | event | 2011-11-01 | 2012-01-02 | | 2 | showing | 2012-11-04 | 2012-11-04 | | 3 | conference | 2012-12-01 | 2012-12-04 | | 4 | event | 2012-01-01 | 2012-01-01 | I want to retrieve events within a certain date range, but I also want to return individual results for each row that has a time span of more than one day. What's the best way to achieve this? Using PHP is a possibility, but I wanted to avoid doing this because I will need to to take pagination into account, etc. Any ideas would be greatly appreciated.

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• How to get a list of installed software packages? [closed]

  - by mblaettermann

  Possible Duplicate: How to list all installed packages? I am on a "grown" system. My initial setup was using Ubuntu 9.04. But now with the 12.04 Update I got stuck. My System is freezing or wired errors occour. I want to reinstall my system on a clean partition. How can I get a list of the packages I installed in my system? I want a list with the base packages not all the dependecies, so I can install all packages on my clean install again with the correct (maybe new) dependencies. I other words: I want to retrieve a list of all packages installed with apt-get directly. Not the ones it additionally installs with these packages. Thanks!

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• Distributed cache and improvement

  - by philipl

  Have this question from interview: Web Service function given x static HashMap map (singleton created) if (!map.containsKey(x)) { perform some function to retrieve result y map.put(x, y); } return y; The interviewer asked general question such as what is wrong with this distributed cache implementation. Then asked how to improve on it, due to distributed servers will have different cached key pairs in the map. There are simple mistakes to be pointed out about synchronization and key object, but what really startled me was that this guy thinks that moving to database implementation solves the problem that different servers will have different map content, i.e., the situation when value x is not on server A but on server B, therefore redundant data has to be retrieved in server A. Does his thinking make any sense? (As I understand this is the basic cons for distributed cache against database model, seems he does not understand it at all) What is the typical solution for the cache growth issue (weak reference?) and sync issue (do not know which server has the key already cached - use load balancing)? Thanks

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• How to simulate objects floating on water without a physics engine?

  - by user1075940

  In my game the water movement is done in a shader using Gerstner equations. The water movement looks realistic enough for a school project but I encounter serious problem when I wanted to do sailing on waves (similar to this). I managed to do collision with land by calculating quad's vertices and normals beneath ship, however same method can not be applied to water because XZ are displaced and Y is calculated in a shader :( How to approach this problem ? Is it possible to retrieve transformed grid from shader? Unfortunately no external physics libraries can be used.

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• The device is not ready

  - by hmloo

  When you retrieve the drive info using the DriveInfo class, if you don't use the IsReady property to test whether a drive is ready, it will throw error as "The device is not ready". so you must use IsReady property to determines if the drive is ready to be queried, written to, or read from. The following code example demonstrates querying information for all drives on current system. using System; using System.IO; class Test { public static void Main() { DriveInfo[] allDrives = DriveInfo.GetDrives(); foreach (DriveInfo d in allDrives) { Console.WriteLine("Drive {0}", d.Name); Console.WriteLine(" File type: {0}", d.DriveType); if (d.IsReady == true) { Console.WriteLine(" Volume label: {0}", d.VolumeLabel); Console.WriteLine(" File system: {0}", d.DriveFormat); Console.WriteLine( " Available space to current user:{0, 15} bytes", d.AvailableFreeSpace); Console.WriteLine( " Total available space: {0, 15} bytes", d.TotalFreeSpace); Console.WriteLine( " Total size of drive: {0, 15} bytes ", d.TotalSize); } } } }

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• Would opencv be a good choice for image colour summarization?

  - by codecowboy

  I would like to analyse a set of hundreds of thousands of product images (clothing, electronic goods etc) and retrieve the dominant colours in each. I'm only interested in the top 3 or 4 colours. The aim is to achieve a degree of certainty that x image is mostly red or image y is mostly orange and blue. The images are likely to be colour jpegs of reasonable quality and approximately 100kb in size. I would like to use C# and the solution should run on a Linux server, preferably using open source libraries. Would opencv be a good choice for this? What other libraries or specific algorithms might be helpful?

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• Main class passes dbConn obj to all its services, I need to change the dbConn for one of its services. - suggestion for design pattern

  - by tech_learner

  There is this main class and there are several services ( which uses db connection to retrieve data ) These services are initialized in the main class db properties are obtained from the property file and then dbconnection is opened by calling a method dbOpen() written in the main class and the resultant connection object is set to the service objects by iterating through the list of services and by calling setConnection method on the service note: that the services are instantiated in the main class and the main class is not a superclass for services. I also need to mention that there is this recycle db connection scenario only main class is aware of. /** connects to DB, optionally recycling existing connection), * throws RuntimeException if unable to connect */ private void connectDb(boolean recycle) { try { if (recycle) { log.status( log.getSB().append("Recycling DB Connection") ); closeDb(); } openDb(); for ( int i = 0 ; i < service.length ; i++ ) { service[i].setConnection(db); } } One of the service needs to use a different database, what is the best design pattern to use?

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• Why does apt-get keep waiting for headers on Oracle repository?

  - by hughdbrown

  I have this at the end of my /etc/apt/sources.list to retrieve Oracle code: deb http://oss.oracle.com/debian unstable main non-free When I run sudo apt-get update, the app gets stuck displaying this message: 100% [Waiting for headers] If I remove this, apt-get update runs without error. Is there a new, recommended URL for Oracle products and, generally, how do you fix this problem? I am pretty sure this did not happen on 11.10 and has only started with the move to 12.04. I have seen these answers and they do not help: apt-get update stuck on "Waiting for Headers" http://ubuntuforums.org/showthread.php?t=1689579 http://muffinresearch.co.uk/archives/2010/03/30/linux-fix-for-apt-get-update-waiting-for-headers/ http://www.kubuntuforums.net/showthread.php?57567-Ubuntu-problems-on-update

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• Detecting right-click on XAML GridView control item

  - by mbrit

  Leaving aside why you would ever want to do this in a touch-centric world, here's how you tell if the right-mouse button has been clicked on a GridView in XAML/WinRT/Metro-style. You have to retrieve a point relative to the UI element you're in, and then query its properties. void itemGridView_PointerPressed(object sender, PointerRoutedEventArgs e) { if (e.GetCurrentPoint(this).Properties.IsRightButtonPressed) { this.BottomAppBar.IsOpen = true; } } (The reason why you might want to do this can be explained by looking at any of the built-in Win8 apps. You can right-click any of the items on any list to bring up a context-sensitive AppBar.)

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• Is there an apt command to download a deb file from the repositories to the current directory?

  - by Lekensteyn

  I am often interested in the installation triggers (postinst, postrm) or certain parts of packages (like /usr/share and /etc). Currently, I am running the next command to retrieve the source code: apt-get source [package-name] The downside is, this file is often much bigger than the binary package and does not reflect the installation tree. Right now, I am downloading the packages through http://packages.ubuntu.com/: Search for [package-name] Select the package Click on amd64/i386 for download Download the actual file This takes too long for me and as someone who really likes the shell, I would like to do something like the next (imaginary) command: apt-get get-deb-file [package-name] I could not find something like this in the apt-get manual page. The most close I found was the --download-only switch, but this puts the package in /var/cache/apt/archives (which requires root permissions) and not in the current directory.

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• Should I create an Enum mapping to my database table

  - by CrazyHorse

  I have a database table containing a list of systems relevant to the tool I am building, mostly in-house applications, or third-party systems we receive data from. This table is added to infrequently, approx every 2 months. One of these systems is Windows itself, which is where we store our users' LANs, and I now need to explicitly reference the ID relating to Windows to query for user name, team etc. I know it would be bad practice to embed the ID itself into the code, so my question is what would be the best way to avoid this? I'm assuming my options are: create a global constant representing this ID create a global enum containing all systems now create a global enum and add systems to it as & when they are required in the code retrieve the ID from the database based on system name I appreciate this may seem a trivial question, but I am going to have many situations like this during the course of this build, and although we are in complete control of the database I would like to conform to best practice as far as possible. Many thanks!

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• Data-driven animations

  - by saadtaame

  Say you are using C/SDL for a 2D game project. It's often the case that people use a structure to represent a frame in an animation. The struct consists of an image and how much time the frame is supposed to be visible. Is this data sufficient to represent somewhat complex animation? Is it a good idea to separate animation management code and animation data? Can somebody provide a link to animations tutorials that store animations in a file and retrieve them when needed. I read this in a book (AI game programming wisdom) but would like to see a real implementation.

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• How to morph from a programmer noob to a guru?

  - by didxga

  I have been a programmer for two years, and i am getting hard to level up my skill especially working at legacy code maintenance right now. I think working hard is not enough to elevate my skill, because there are ton of opensource around us, the preoject i have been involved are all mixture of opensources --- from front end to back end from presentation tier to business logic tier. My work is just gluing all these together or something fewer complex which is to collect data from UI to logic module then retrieve the data processed and put it to UI. Sometime there is a need to add some simple logic(like assembling the data to a form that fit business logic interface) while transport data. Could you please give me any suggestion what should i do on the side to improve my skill? Thanks!

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• How to do lazy loading in a SOA fashion?

  - by sun1991

  For example, I've got a root object exposed in a SOA service, say Invoice (Invoice has line items as children). Sometimes, I need to retrieve its detail line items. I'm thinking to make it lazy loading, because it's a traffic overhead to transfer line items every time Invoice is required. But in SOA fashion, it seems unlikely. Because all it can expose are Invoice POCOs, with contain no logic. Thus I cannot attach my lazy loading logic to Invoice to instruct it to load lines items when needed.

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• Help installing?

  - by Meghan Dempsey

  I'm having a really big problem with installing Ubuntu on my computer. It seems that when I try to install from BIOS from the CD, nothing happens, and when I say nothing happens it boots up my computer like usual. When I try to install from the CD from My Computer directly from the wubi.exe file, nothing happens. THEN when I try to install from the boot helper, it gives me this error: An error occurred: Could not retrieve the required installation files For more information please see the log file: c:\users\Meghan\appdata\local\temp\wubi-14.04-rev286.log Will it help if I say I have a pirated version of Windows? Maybe that's why? I'm frustrated, and I'm not sure what to do. Please help me

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• Access Token Verification

  - by DecafCoder

  I have spent quite a few days reading up on Oauth and token based security measures for REST API's and I am currently looking at implementing an Oauth based authentication approach almost exactly like the one described in this post (OAuth alternative for a 2 party system). From what I understand, the token is to be verified upon each request to the resource server. This means the resource server would need to retrieve the token from a datastore to verify the clients token. Given this would have to happen upon every request I am concerned about the speed implications of hitting a datastore like MySQL or NoSQL upon every request just to verify the token. Is this the standard way to verify tokens by having them stored in a RDBMS or NoSQL database and retrieved upon each request? Or is it a suitable solution to have them cached (baring in mind that we are talking millions of users)?

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• sprite group doesn't support indexing

  - by user3956

  I have a sprite group created with pygame.sprite.Group() (and add sprites to it with the add method) How would I retrieve the nth sprite in this group? Code like this does not work: mygroup = pygame.sprite.Group(mysprite01) print mygroup[n].rect It returns the error: group object does not support indexing. For the moment I'm using the following function: def getSpriteByPosition(position,group): for index,spr in enumerate(group): if (index == position): return spr return False Although working, it just doesn't seem right... Is there a cleaner way to do this? EDIT: I mention a "position" and index but it's not important actually, returning any single sprite from the group is enough

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• What would one call this architecture?

  - by Chris

  I have developed a distributed test automation system which consists of two different entities. One entity is responsible for triggering tests runs and monitoring/displaying their progress. The other is responsible for carrying out tests on that host. Both of these entities retrieve data from a central DB. Now, my first thought is that this is clearly a server-client architecture. After all, you have exactly one organizing entity and many entities that communicate with said entity. However, while the supposed clients to communicate to the server via RPC, they are not actually requesting services or information, rather they are simply reporting back test progress, in fact, once the test run has been triggered they can complete their tasks without connection to the server. The request for a service is actually made by the supposed server which triggers the clients to carry out tests. So would this still be considered a server-client architecture or is this something different?

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• Initiating processing in a RESTful manner

  - by tom

  Let's say you have a resource that you can do normal PUT/POST/GET operations on. It represents a BLOB of data and the methods retrieve representations of the data, be they metadata about the BLOB or the BLOB itself. The resource is something that can be processed by the server on request. In this instance a file that can be parsed multiple times. How do I initiate that processing? It's a bit RPC like. Is there best practice around this? (First time on programmers. This is the right place for this sort of question, right?)

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• Desktop GUI Client - Remote RDBMS communication

  - by magom001

  Sorry if I am asking a trivial question but I have been searching for a while without any luck. I need to design a system and I am looking for advice on the technology that should be used. The layout is very simple: it is a sales application with a centralized database and multiple clients. Each salesperson has GUI app installed on his/her laptop that should be able to connect to the database to retrieve data and upload data (i.e. register new orders). My question is the following: how should the communication between the client and the server be implemented? I doubt that connecting directly to the RDBMS is a good idea... Should I use web-services? XML-RPC? How to implement authentication and encode the data? Thanks for your advice!

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• C# to develop Android app

  - by opt

  I am learning C# and I'm wondering if there is the potential to develop an Android app that satisfy the need that I'm going to explain. I would basically need an app that, when launched retrieves some data from a webpage (i.e. realtime stock prices), trim the xml to find the data i need and store this value into a variable. Then some calculation is performed on this data and the result is sent via email. It is already possible to launch an app automatically based on some conditions (e.g. every 5 minutes) by using the software Tasker. It is actually also possible to retrieve the data from a webpage and save to a Tasker variable or to a txt file somewhere in the phone (or Dropbox/Box...). But I would like to do that directly via an app so that everything is done "internally" once the app is launched. If that's possible, how should I proceed? Is there any good reference I can use to address my need?

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