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  • What is the correct pattern to use in this case?

    - by nulliusinverba
    I'm sure this scenario has arisen before, and I want to know what experience has taught to be the best solution. I have a number of classes that are all of a kind. Say all the objects are "Content". They may be "Article", or "Book" for example. The reason I want the "Content" abstraction is because I want to define a number of behaviours for all "Content" objects and not have to build a new DB Table and 10 classes of essentially the same code for each type of "Content". For example, to attach a "Tag" or a "Premise" to a content object would be much nicer if, say, I just had two columns one for ContentID and one for TagID. A solution I've played around with is to have a Content table with a unique ID, and then to have foreign key references on all the other tables (Book, Article, etc). This has actually proven quite solid, but I'm just not sure about it. Do you know how to call this described pattern?

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  • Ubuntu 12.04 does not start

    - by ferr
    Im using Lenovo G580. I installed Win7 first, two months ago. Now, i want to install Ubuntu 12.04. I used usb for installation. It went very well, but when i was reboot laptop after installation, it started Win7 not Ubuntu or bootloader for choice. LiveUbuntu is working very well. I tried install ubuntu a couple of times from other .iso. I tried recover Grub. When i change "boot" flag in gparted to partition with Ubuntu, BIOS show me error "missing operating system".("boot" flag is optionally on Windows partition c:/). Can it be hardware mistake? Or i did some mistakes?

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  • Gnome breaks Unity [on hold]

    - by user208020
    I just did a clean install of Ubuntu 13.10. I thought I'd play around with the GNOME desktop so, I installed it. However, it now seems there is no going back. When I attempt to switch back to Unity from the login screen, I get a hybrid of both Unity and GNOME. I have two questions: How do I restore Unity? It appears to be broken. I've also heard that Cinnamon breaks Unity in 13.10. What desktops are currently compatible with 13.10?

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  • Implementing cache system in Java Web Application

    - by TGM
    I worked with JPA (Eclipselink implementation) and Hibernate. As I understand these two have great caching systems. I am interested in caching in a Web application and in order to better understand the process I'm trying to implement something on my own. Sadly, I cannot find any in depth documentation about this subject. I'm interested in things like high scalability, sharing memory on different machines and other important theoretical matters. Is there any tutorial or open project I could check out? Thank you! *LE: * I want to cache DB information in POJOs just like JPA or Eclipselink

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  • Ubuntu 12.04 mdadm inactive

    - by user32274
    For a while now, my RAID 5 has ceased to work. Everytime I tried "madm --detail /dev/md127", its states all the drive and drive info, but that two of the drives have been removed. After some restarts, doing the same thing, i am getting /dev/md127 does not appear to be active. When I go into DiskUtil, I can see all 6 Hard Drives healthy and present, and i can see the Raid 5 at the bottom under Multi-disk Devices. However, the Raid says 0.0kb, and is not active. Please help and let me know how to proceed from here. I would really like to avoid rebuilding the RAID, especially because all 6 drives seem to be healthy and present. Thanks so much.

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  • ATI ES1000 graphic card

    - by Jorge Biurrun
    I am installing Ubuntu 12.04 on an IBM x3250 M2 server, It has an ATI ES1000 with no acceleration (that does not bother me, we don't need it), we use it to connect remotely via FreeNX. FreeNX works fine, (except than in Windows 7 machines NX Client shows only icons and no text ?!) but the only resolution I can get in the monitor directly attached to the server is 800x600. The display manager also shows me two monitors!, the real one and one IBM 15". Which driver should I install?. It seems that the ATI driver that comes with Ubuntu does not work properly. Any help will be apreciated. Thanks in advance. j&b

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  • Are my Google Analytics ( 2 domains 1 site) duplicated or unique?

    - by MarcDJay
    We have recently built a new website with a new domain to replace an old website, and on the advice of our IT guys and web dev team have pointed both oldaddress.com's & newaddress.com's a records to the new website. Now, they both share the same google analytics code (UA-12345-1) and as such we have two entries in the Google Analytics dashboard. The problem is I'm still fairly novice with GA and as the reports seem VERY similar (~25k pageviews for each domain), are these figures exclusively for that domain? For example: oldaddress.com 25,400 pageviews newaddress.com 25,600 pageviews Does this mean that in total for this website I have 51,000 pageviews. Hope this is clear enough but let me know if anything needs clarifying. Thanks.

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  • CSS&ndash;margin or padding

    - by woodbase
    I was beginning the implementation of a new design, and once again I found that my margin property on a div-tag, did not behave as I expected. So I decided to look for best practice when it comes to using margin or padding. What I found was this very short and concise description of the difference between the two: “Margin is on the outside of block elements while padding is on the inside. Use margin to separate the block from things outside it, padding to move the contents away from the edges of the block.” So what is best practice? Well it depends on the context. In my case I should have used padding…

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  • ssh client times out to some servers, works on others

    - by mmdanziger
    I have a strange problem and I'm not sure where to begin. My ssh client works on some servers but times out on others. Obviously, I checked that the servers are accessible via ssh from other locations. From my machine A I can log on to C only by logging on to B first. There are at least two servers for which this is the case. To make matters more strange sudo ufw status - Status: inactive nmap -sT -p 22 <problem_server> - ...22/tcp open ssh... On one affected server I am getting: ssh_exchange_identification: Connection closed by remote host and on the other I am getting ssh: connect to host <problem_server> port 22: Connection timed out With both of these servers I can log in from other machines. How can I troubleshoot such a problem?

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  • Distinguishing between sets of status reports

    - by user1769486
    I am working on an internal database monitoring system and am at a point where I sort of hit the wall in terms of application design. Basically I have an extensible plugin architecture where I shall have an OK, a warning or an error upon running a db verification. My first question whether it is sufficient to have only one status reported with an optional status message or provide the ability to have more than one returned (with attached messages) and then calculate an aggregated overall status. In particular in the latter case my second issue would be how to distinguish between two verification reports with the same status code (as it can come from different triggers). I would need to do this to see whether some change happened between the current and last verification. I could simply have string comparisons of the attached status messages mentioned above but that does not seem very reliable.

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  • Lubuntu does not render font accurately [closed]

    - by mac
    I'm experiencing a weird bug, which I don't see to be able to track down to anything in particular.... Sometimes, Lubuntu won't display entirely a letter or two of the font used system-wide. I attached a screenshot of the last occurrence of the problem, where the affected letter is t. Any idea on what is causing it? And even better: any idea on how to fix it? PS: My Lubuntu installation is pretty much a stock one. I installed some additional software like "kupfer", "tilda" or "alsamixer"... but - as far as I remember - I did not tweak in any way the LXDE settings...

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  • Ubuntu crashed during the update to 12.04, not I can't recover my files, help please

    - by mrah
    I'm pretty new to Linux and I've only installed Ubuntu as I couldn't afford to buy Windows, worked well and I liked it. But I chose to upgrade it to the newest version after a prompt. The update froze and the machine was unresponsive which forced me to hard reboot it. Now nothing seems to load and I've reached my wits end (mainly cos I'm lost in all the command lines). I've decided to try and recover my data from the hard drive, only two folders, by selecting the try Ubuntu option when I insert the OS CD into the machine. The problem I'm experiencing now is it won't let me copy my folders, I get a 'The folder contents could not be displayed. You do not have the permissions necessary to view the contents of "folder_name".' Does anyone know how I can recover this data?

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  • Cross-platform & 3D mobile game development [on hold]

    - by Sylvia MBemba
    I am not a developer or programmer and, I am planning an educative project that will involve having students to develop a cross-platform, 3D mobile game, similar to the SimCity concept. I need to write a project requirement and I'd like to pick someone's brain to understand what's involved in developing such a project: Is it realistic to have one or two students to do it? and along their other modules at uni? How much time can it take to develop from scratch? what are the different skills required?

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  • Can i have a facebook fangate between pages of my website

    - by Onaiza
    I am not sure whether this is possible can i have a fan gate between two pages of a website, so that before a visitor can access a particular url it would be mandatory to like our fan page on facebook? Scenario I have a travel website puneritraveller.com, and for each destination featured in the website i have listed hotels, with a direct link to the website of the hotel. for example i have featured a destination 'Alibaug' with a hotels page - puneritraveller.com/alibaug-hotels.html , in this page i have given banner ads for a few hotels for example Yellow house which on clicking redirects to www.yellowhousealibag.com What i want to achieve is, when someone clicks on the banner ad for Yellow house they should be redirected to a page with a like button to facebook.com/puneritraveller and once he/she clicks on the like button should be redirected to www.yellowhousealibag.com Is this possible? Please help

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  • What to do about USB support?

    - by RhZ
    USB speeds are consistently slow in ubuntu, and have been for years. I just bought two new machines with usb 3.0, running 10.04, and yet nothing has changed, top speeds are only about 8.0 MB per second and they quickly drop to 2 or less. Its very frustrating. Are there any fixes for this at all? I find almost nothing online. The board is a gigabyte 970A-DS3 motherboard. Is there any driver I should install? I am using brand new usb sticks (kingston) and making sure to plug into the 3.0 (blue) slot.

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  • PHP class data implementation

    - by Bakanyaka
    I'm studying OOP PHP and have watched two tutorials that implement user login\registration system as an example. But implementation varies. Which way will be more correct one to work with data such as this? Load all data retrieved from database as array into a property called something like _data on class creation and further methods operate with this property Create separate properties for each field retrieved from database, on class creation load all data fields into respective properties and operate with that properties separately? Then let's say I want to create a method that returns a list of all users with their data. Which way is better? Method that returns just an array of userdata like this: Array([0]=>array([id] => 1, [username] => 'John', ...), [1]=>array([id] => 2, [username] => 'Jack', ...), ...) Method that creates a new instance of it's class for each user and returns an array of objects

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  • Is Java a good choice for small to medium size websites? [closed]

    - by mephisto
    Why do I ask? I want to use one language not two. Yes I know with Java and .NET I can program anything, but, as a website it should have a good design, I don't want to build ugly sites. Which is why for smaller sites I use PHP, I can get the e-comm I want and also a nice UI pretty easily, unlike in ASP.NET. But would I run into this design rstriction with Java (I've never used it). Plus, Java would also give me exposure to Android development. So..then I could ditch PHP? I guess I am looking for the 'one ring to rule them all', and not 2 or 3 (languages). Thanks in advance,

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  • How can I paste text by pressing the left and right mouse buttons at the same time?

    - by Badministrator
    I am coming from Ubuntu 10. I just recently upgraded to 12.04 LTS. In 10, I use to be able to cut and paste from Terminal by selecting text, and just pressing my two mouse buttons. In 12.04, I can't seem to do this. I have to highlight text, then right click to copy, then right click to paste. Or, I can do ctrl-shift-c and ctrl-shift-v. Both are okay methods, but not as fast as before. How do I configure Ubuntu to preserve 'old-school' cut and paste?

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  • Separating Db from business with Inherited classes using multiple views

    - by catalinux
    I have a software that has a car model that will be used in different views (listing, ads, detail page, carousel, up sell widget,etc). class CarModel extends DbModel{ } I look for a "nice way" (a combination of flexible, easy to maintain,etc) to have this used in views. I'm thinking at two different ways Having object views for each context CarViewBase{ var car;// of type CarModel function constructor(args){ //will instantienta internal variable car based on args } function getThumb(){ } function getTitle(){ } } CarListingView extends CarViewBase{ function getListing(){ } } CarAdsView extends CarViewBase{ //the busines rule changes for ads widget function getThumb(){ } } Extending directly the CarModel The challenges comes when My Car Model might need an abstract factory. Let's say I have a field on my car object that states the type of the car : a truck, or a bike, or van. How would affect that my object view? Let's say that getTitle() rule would be different for each type of it. How would you do it?

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  • What's New in JMS 2 - Part 1

    - by reza_rahman
    JMS 2 is one of the most significant parts of Java EE 7. One of the principal goals of the JMS 2 API is improving developer productivity by reducing the amount of code to work with JMS by adopting programming paradigms like higher level abstractions, dependency injection, annotations, runtime exceptions, the builder pattern and intelligent defaults. In a recent OTN article, JMS 2 specification lead Nigel Deakin covers the ease-of-use changes in detail. The article is the first of a two part series on JMS 2. For more visual folks, there is my JMS 2 slide deck: What’s New in Java Message Service 2 from Reza Rahman You can also check out the official specification yourself or try things out with the newly released Java EE 7 SDK.

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  • gnome-panel has multiple rows -- how to undo that?

    - by towi
    On Ubuntu 12.04 I use openbox with a single "gnome-panel" started. But after trying to configure my two screen in Xinerama mode I got additional rows of panels each time X restarted. And despite I completely reverted to my one-screen-X-config the gnome-panel displayed has 4 rows (4 at top sreen, 4 at bottom) only the outermost row has content, the other 3 are empty there is only one gnome-panel process running some widgets appear 4 times, too, although they run only once when I switch away from openbox using unity I am back to 1 row temporarily What went wrong here? How do I undo that? Things that did not help: rm -Rf .gnome2 .gconf/ .compiz-1/ pkill panel, and restarting it

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  • Physics for moving blocks

    - by Gabson
    I'm working on a 2D game for windows phone where the player moves blocks around to bounce a laser beams. I need to create some simple physics for moving the blocks. For the moment I have a simple collision class, telling me if two rectangles collide. But that's not enough because when I'm moving a block the rectangle/rectangle function doesn't work. By Doesn't work i mean,I manage the collision but I don't how to stop the block mooving while the user sliding the block. The collision response for the block I want is if the user tries to slide it on another object, the block should slide up against the other object and not overlap. How would I go about implementing this functionality?

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  • VBA functionality in Word 2007 [closed]

    - by Mac
    I have a VB system that utilises VBA and MSWord 20078. I have a few problems that I am hoping you solve for me. I need to search for a string in a Word 2007 document and then pickup all characters into a VB Variable from that string to the next carriage return inclusive. I will then manipulate the contents of the VB variable. When I find the search string I need to know what section of the document I am in. Once I have these two pieces of information I then need to continue to the next occurrence of the search string and repeat my functionality. Once I have dealt with the last occurrence of the search string I need to know that so that I can exit the process. Any assistance would be greatly appreciated

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  • Google Games Chat #3!

    Google Games Chat #3! The Google Games Chat is back! Now with a little bit of structure! Come check out the hot new property that Web Pro News raved "a show", and what we here at Google call "45 minutes away from doing real work." We'll be chatting about games, industry trends, and making bold new predictions that will probably look ridiculously wrong in three years. As always, please ask questions in the Google Moderator section below, and we might even get around to answering one or two. From: GoogleDevelopers Views: 0 0 ratings Time: 00:00 More in Science & Technology

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  • How to backup a dev & QA folder website structure?

    - by novicePrgrmr
    A site I just became in charge of uses a really simple two folder structure to host the dev site and the QA site. The sites are hosted on the company servers so I just have the sites' folders mapped on my desktop. I would like to run some kind of backup scheme, but I am finding it hard to think of a way to do this effectively. The problem is that we aren't using any revision control software, and since the servers aren't controlled by me, I don't think I will be able to implement anything like that. Or could I? The entire site is static too, so no DB's or anything besides html, images, PDFs, etc.

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