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• What's the point of Rabbit MQ? [duplicate]

  - by bad_boy

  This question already has an answer here: When to use Advanced Message Queuing Protocol like RabbitMQ? [closed] 2 answers First of all, let me say, I have no problem following tutorials. The problem is that I don't understand why even Rabbit MQ is ever needed. And there's no such explanation on tutorials - they only show what to do and how to use, but not when its usage is the case. Can you explain this? Why would you want to use Rabbit MQ? To solve what problem?

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• vmbuilder fails on chroot

  - by Bruce

  I am trying to install virtual machine with this command, but have no success: vmbuilder kvm ubuntu --verbose --suite precise --flavour virtual \ --part partitions.txt --ip 192.168.1.3 --hostname edb1 --arch amd64 \ -o --libvirt qemu:///system --user someuser --pass somepass \ --raw /home/virtual-machines/edb1.disk1.img \ --raw /home/virtual-machines/edb1.disk2.img \ --domain somedomain.com --mem 4096 --cpus 4 This is the error: ... I: Extracting xz-utils... I: Extracting zlib1g... W: Failure trying to run: chroot /tmp/tmp_JdKzu mount -t proc proc /proc , stderr: The host kernel is not original but modified by server provider. Why is the chroot needed for installation?

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• WF4 &ndash; It has suddenly got interesting

  - by MarkPearl

  I was at Teched two years ago when one of the Microsoft leads said there were three new area’s that we needed to pay attention to for development, namely: WPF WCF WF At the time I was just getting back into development work and had a look at WPF and immediately was sold on the approach. While I haven’t been to involved with WCF directly, I know that some of the guys in my dev team have been and that it too was a success. So what happened to WF? It seemed clunky, and all the demo’s that I saw of it left me scratching my head wondering how if it was going to be useful. Fast forward two years later and while I have had a brief look at WF4, I can immediately see areas where we can use the technology. Does that mean that I think WF4 is the bees knees? I don’t know enough about it yet to really have a solid opinion, but I do think that it is finally going in the right direction. A good introduction to WF4 can be found here.

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• Drawing application on OpenGL for iOS (iPad)

  - by Alesia

  Some help is needed. I'm developing drawing application on OpenGL (deployment target 4.0) for iOS (iPad). We have 3 drawing tools: pen, marker (with alfa) and eraser. I draw with textures, using blending in orthographic projection. I can't use z-ordering because in this case I have to face a lot of troubles with cutting and erasing. The thing that I need is to make the pen be always on the top. When I first use marker and than pen - it's ok. But if I use pen first and marker over the pen - I can't see pen color under marker. I'd appreciate any help or advice. Thank you veeeeeery much!

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• How do I get the Java plugin in Firefox 3.6 working?

  - by interstar

  I have Ubuntu 10.10. I needed the Sun Java so I added Sun Oracle as supplier of packages and installed java-6. However, I haven't been able to persuade Firefox to use this Java for the browser. In fact I managed to turn off the original Java plugin (I can't remember exactly how) and I can't see any way to re-enable it. Ie. it doesn't appear in the "plugins" page of the Add-ons option. (I'm in Firefox 3.6.13) Any suggestions for how to re-enable Java in FF 3.6, and make sure it's using the Sun version? thanks phil

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• Game getting progressively laggier?

  - by Valentin Krummenacher

  I have a small game in HTML5 that uses socket.io to communicate with a node.js server. Now my problem is that, eversince I did my last update on it it seems to have something "chunk up" in the background making it laggier and laggier the longer it runs. In the update were a few temporary local variables being defined with var(you know, variables that are only used during one function and then not needed anymore) alongside with alot of other changes, and I am not even sure if this update or something else is causing this. Might the "var" have caused it? Or what other reasons might this strange complication have?

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• Are Promises/A a good event design pattern to implement even in synchronous languages like PHP?

  - by Xeoncross

  I have always kept an eye out for event systems when writing code in scripting languages. Web applications have a history of allowing the user to add plugins and modules whenever needed. In most PHP systems you have a global/singleton event object which all interested parties tie into and wait to be alerted to changes. Event::on('event_name', $callback); Recently more patterns like the observer have been used for things like jQuery. $(el).on('event', callback); Even PHP now has built in classes for it. class Blog extends SplSubject { public function save() { $this->notify(); } } Anyway, the Promises/A proposal has caught my eye. It is designed for asynchronous systems, but I'm wondering if it is also a good design to implement now that even synchronous languages like PHP are changing. Combining Dependency Injection with Promises/A seems it might be the best combination for handling events currently.

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• Having trouble's understanding NIF model file format?

  - by NoobScratcher

  I'm attempting too develop a 3rd party application to make it easy to import 3d model part's into my mod for skyrim the plan was to have a fileviewer and preview window of the nif model but since , I don't know what the NIF file format actually is or where to get the vertex data from it or the hole nine yards of parsing a text file in detail I'm at a lost what to do. I'm very good at C++ but not at this super over complicated file formats , id much prefer .obj over the nif file format specification here -- http://niftools.sourceforge.net/doc/nif/index.html If someone could help me in understanding the file format in a natural and simple way and the exact parsing needed to create the 3D Model in the frustum and a explanation on how you figured that out would be happy to know. I use cygwin , notepad++ , win32 7

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• Create ASP.NET 3.5 Sitemap XML for Navigational Web Controls

  It is important to create a user-friendly website. One aspect that defines a user friendly website is having clearly-defined navigation based on a web sitemap. In ASP.NET 3.5 there are called navigational web controls that are used to create and present navigation to website users. These navigational web controls depend on the website XML sitemap. This tutorial will illustrate how a developer can create this XML sitemap which can be used to power the web controls needed to present website navigation.... It?s Better Together Deploy Windows Server 2008 r2 with Windows 7 and get a host of special features.

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• Modern workflow / project architecture with PHP

  - by Sprottenwels

  I wonder how one professional developer would design the backend-part of his application. I try to use PHP as seldom as possible and only for data serving/saving purposes. To do so, i would create a module/class for every greater part of my application, then write some single script files which are called by javascript. E.g: User clicks a "retrieve data" button javascript will call retrieveData.php retrieveData.php will create an instance of the needed class, then executes myInstance-retrieve() the data is returned to my JS by retrieveData.php However, i see some disadvantages in this practice: I will need a single scipt file for every action, (e.g retrieveData.php, saveData.php etc) I need a man-in-the-middle step: from JS to my single script, to my classes How are modern applications designed to accomplish what i need to do?

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• Does it makes sense to backup the whole partition as opposed to their files?

  - by maaartinus

  I know that on Windows it's quite futile to try to backup the "C:" partition file-wise and that's why a full partition backup is needed. Is it OK to backup a the root Linux partition file-wise? Are there any downsides? Clarification Here, I don't care about advantages of partial backups. I'm going to do additional separate backups of /home, etc. What I'm interested in here is the comparison of backup of all files from / vs. backup of the whole partition as device What are the advantages of something like dd if=/dev/sda1 ...?

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• Flash site loads slowly

  - by bogdanvursu

  I have a simple html page that embeds an swf, that downloads other xml, swf and image files. The total count of the requests reaches about 90. I am aware that it should take a while until the content is available and I am OK with that. All the needed files are hosted by two different providers in the US: flashxml.net/monochrome-demo.html and u1.flashcomponents.net/samples/8751/index.html From two different countries in Europe, the content shows up a lot later (almost twice as later) from flashxml, than flashcomponents. I've done mtr tests and the ping difference is about 40ms and the flashxml server load is below 1. Do you have any other suggestions as to what should I look at?

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• Accessing network shares through ASP.Net

  - by jkrebsbach

  In my impersonation enabled web site I needed to access files on a network share.  Running locally, everything worked fine. After deploying out to the dev server and hitting the web site from my PC, things fell apart. With impersonation enabled, we can access files on the server itself, but a network share is another story.  Accessing a share on another server, we encounter the infamous "double hop" situation, were the credentials have already been digested on the web server and are not available for the file server. We need to either expose the shared files to the identity IIS is running under, or create a new impersonation context.

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• Randomly spawning bitmaps on cnvas

  - by Toystoj

  I need some ideas in order to finish algorithm. I'm randomly placing objects (bitmaps) on canvas without overlapping. Time needed to finish it is my problem. When I need to spawn for example 80% of canvas it takes to long. So i was thinking : I should make some change when the bitmaps take off 50 % of canvas. I want to tell algorithm that it should generate new locations (x,y) where it is free space. My question is : How to render new location (x,y) in place where is free space. In summary: Things I know : object location (x,y) 4 corners (x,y) of object object width, height canvas width, height Any suggestions?

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• In Search Data Structure And Algorithm Project Title Based on Topic

  - by Salehin Suhaimi

  As the title says, my lecturer gave me a project that i needed to finish in 3 weeks before final semester exams. So i thought i will start now. The requirement is to "build a simple program that has GUI based on all the chapter that we've learned." But i got stuck on WHAT program should i build. Any idea a program that is related to this chapter i've learned? Any input will help. list, array list, linked list, vectors, stacks, Queues, ADT, Hashing, Binary Search Tree, AVL Tree, That's about all i can remember. Any idea where can i start looking?

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• Should I try to write simple key-value storage by myself?

  - by shabunc

  I need a key-value storage in a simplest form we can think of. Keys should be some fixed-length strings, values should be some texts. This key-value storage should have an HTTP-backed API. That's basically it. As you can see, there is no big difference between such storage and some web application with some upload functionality. The thing is - it'll take few hours (including tests and coffee drinking) to write something like this. "Something like this" will be fully under my control and can be tuned on demand. Should I, in this specific case, not try to reinvent bicycles? Is it better to use some of existing NoSQL solutions. If yes, which one exactly? If, say, I'd needed something SQL-like, I won't ask and won't try to write something by myself. But with NoSQL I just don't know what is adequate and what is not.

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• why does my lubuntu recognizes only lubuntu instalation cds?

  - by Hardi

  I installed lubuntu from alternate cd a month ago. Now when I needed to read some cd's, the cd try won't open. It can be opened before ubuntu boots up. It can be opened after entering sudo eject -i off from console. But it won't mount any other cd-roms, than just the lubuntu live-cd and lubuntu alternate instal cd, where it was installed from. "mount: no medium found on /dev/sr0" as output, when try to mount anything else. Problem can't be in corrupted sd's, because othe computer, did recognize them well.

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• Alternative Web model

  - by Above The Gods

  One of the problems web apps have against native apps, especially on the mobile front, is the constant need to re-download each web page on request. Ultimately, this leads to slower performance. Why if web apps only download new pages if they're actually needed, not because they're simply requested. For example: perhaps the server can store a web page version in a cookie. Every slight change to the page on the server-side changes the version number. Now instead of the browser requesting a new page each time, why not just check the version number and have the server send the page if they're different? If the page similar, the user can just use a cached page. I'm sure browsers doesn't necessarily have to change to accommodate changes to this, correct?

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• Managing large downloadable content on mobile devices

  - by larromba

  This is a general question of how to best manage large downloadable content on mobile devices. Lets consider a situation whereby a mobile app needs to download a number of very large content items, like HD videos, that are over 500MB but under 2GB. Now, lets assume this content delivery system should be scalable. Would it be a fair assumption that: A reputable cloud service would be needed - if so, what is a reliable and cost effective cloud service for mobile devices based on anyone's experience? Large content downloads should only be attempted over a wifi connection, so the end user doesn't incur large costs, e.g. when travelling. Downloads should carry on in the background if possible, as the user won't want to wait in an app for long periods. If the downloads don't finish, or the OS quits the app, all downloads should carry on when the app is next activated? Are there any other pitfalls anyone may have experienced when managing large content on mobile devices? Thanks.

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• Wide gap in my resume as a Java developer. What are must-have skills required to get hired those days? [closed]

  - by OnlineAlien

  For some legal reasons I haven't worked for anybody for the last 12 years. I am a java web developer or at least I am thinking so. For this period I have been working on my project- some sort of business network - and I did few small jobs, so right now I feel I am far behind in terms of my skills and the skills needed today. I lingered too long on Struts and Hibernate and thought that could the job for my project. I need to get a job, right now, so I am spending most of my time brushing my skills. My question is: What are the current necessary skills that could convince employers to hire me regardless of my past employment or the lack of it. Right now I am on AspectJ, IoC and Spring Thanks

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• Set modified date = created date or null on record creation?

  - by User

  I've been following the convention of adding created and modified columns to most of my database tables. I also have been leaving the modified column as null on record creation and only setting a value on actual modification. The other alternative is to set the modified date to be equal to created date on record creation. I've been doing it the former way but I recent ran into one con which is seriously making me think of switching. I needed to set a database cache dependency to find out if any existing data has been changed or new data added. Instead of being able to do the following: SELECT MAX(modified) FROM customer I have to do this: SELECT GREATEST(MAX(created), MAX(modified)) FROM customer The negative being that it's a more complicated query and slower. Another thing is in file systems I believe they usually use the second convention of setting modified date = created date on creation. What are the pros and cons of the different methods? That is, what are the issues to consider?

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• Acceleration Based Player Movement

  - by Mike Sawayda

  Ok, so I am making a first person shooter game and I am currently working on movement that looks and feels good. I want to incorporate acceleration based movement for the player so that he has to accelerate to max speed and decelerate to minimum speed. Acceleration will happen when you have the key pressed and deceleration will happen when you let go of that key. The problem is that there are some instances where you switch from moving forward to moving backward where no deceleration is needed because you could potentially be moving at double speed in the reverse if you did. Does anyone have a good implementation of how to accomplish acceleration based movement that works well?

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• migrating sharepoint databases

  - by Alex Bransky

  If you're wondering how to migrate your SharePoint databases to a new server, this Microsoft article is actually pretty useful, though still overly complex like most of their other articles. http://technet.microsoft.com/en-us/library/cc512725.aspx The one thing I would change is that they seem to recommend installing SQL Server Configuration Manager on web servers, when all that was needed in my case was to add an entry to the hosts file on the SharePoint web server that used the IP address of the new SQL Server with the name of the old SQL Server.  This might not be appropriate in cases where the old server is not being decommissioned.

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• Windows 8 Location Services

  - by ryanabr

  I spent the afternoon with the Geolocator object in the WinRT and Widows 8 platform. I have also been working with doing Windows Phone 7 development, and first had to wrap my head around the fact that while similar, it is not the same as the GeoCoordinateWatcher that environment. I found a nice example here http://code.msdn.microsoft.com/windowsapps/Geolocation-2483de66 But the behavior of my app wasn’t the same. Once you ensure that location services is enabled by following these instructions: http://msdn.microsoft.com/en-us/library/windows/desktop/hh768219.aspx Location Services was still disabled. From everything I read, it sounded like the first time you try to use the Geolocator object, the user would be prompted to allow to “Access to your location”. After nosing around I found the issue. You need to add the location service as a Capability in the Package.appxmanifest file: After checking the box, I was prompted to allow access to location services as expected the first time I needed to use it.

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• Is using build-in sorting considered cheating in practice tests?

  - by user10326

  I am using one of the practice online judges where a practice problem is asked and one submits the answer and gets back if it is accepted or not based on test inputs. My question is the following: In one of the practice tests, I needed to sort an array as part of the solution algorithm. If it matters the problem was: find 2 numbers in an array that add up to a specific target. As part of my algorithm I sorted the array, but to do that I used Java's quicksort and not implement sorting as part of the same method. To do that I had to do: java.util.Arrays.sort(array); Since I had to use the fully qualified name I am wondering if this is a kind of "cheating". (I mean perhaps an online judge does not expect this) Is it? In a formal interview (since these tests are practice for interview as I understand) would this be acceptable?

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