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• Use of Service Bus in a Pub-Sub Engine

  - by JoseK

  In one of our projects, we've built a Publisher - Subscriber Engine on Oracle Service Bus. The functionality being a series of events are published and subscribers (JMS queues) receive these whenever a new event is published. We are facing some technical issues now, performance-wise and hence an architectural review is underway. Now for my questions: Architecturally the ESB has to publish events into a DB and read from the DB which users wish to be notified, then push the event onto their respective queues. There is a high amount of DB interaction and the question is whether ESB should be having such high amount of interaction with the DB in the first place? Or should there have been some alternate component responsible for doing this. Alternately is there any non-DB approach in which we can store the events and subscribers? Where else can this application data be held within the ESB context?

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• How can I remove packages using preseed?

  - by Jorge Castro

  I'm setting up an automated "no questions asked" preseed system and using Dustin Kirkland's server preseed as an example. He uses the following line to install three packages as part of the automated install: d-i pkgsel/include string byobu vim openssh-server I am looking for the inverse of this, basically be able to remove packages as part of the automated install. I've checked the Installation Guide I've checked this example preseed, but it's not clear if this is the canonical list of every single option available. I am thinking I need to to use d-i preseed/late_command string apt-remove packagename to clean up stuff I don't want when the install is done, but I am not sure

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• What's the best way to move to linux from windows for web development ?

  - by rajesh pillai

  I am primarily a programmer developing on windows based OS using c# as my primary language. I am evaluating Ubuntu Linux as an alternate platform and would like to know the best stack for doing web development on this. I had gone through the following thread Moving development from Windows to Linux but it doesn't answer my questions fully. Some of the points I am interested are outlined below PHP/Ruby/Python (What would you recommend?) Is Mono mature enough for any large scale development? Has anyone any real experience using Mono. IDE (including debugging support, intellisense, source control integration,Unit testing) Unit testing framework based on the language recommended Web framework if any. Load Testing tools Web server (I know there are many webservers, but would like to know which one is primarily used by most people) Your inputs is greatly appreciated. Thanks.

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• Permanently mounting Windows' NTFS partition, fully enabled

  - by Bart van Heukelom

  I'm transforming a Windows 7 PC into a dual boot system with Ubuntu 10.10. Following other questions on this site, I've mounted my Windows drive by adding this to fstab UUID=blabla /windows ntfs users,defaults,umask=000 0 0 It appears to work well, I can read and write, but it appears to be a bit crippled still. When I tried to update an SVN working copy with RabbitVCS, it complained that it couldn't write to a temporary file inside the working copy, even though the permissions are all on 0777 inside /windows (by default, I haven't done that manually). It even corrupted that working copy :( It works when I use the command line SVN client with sudo, but that's hardly user friendly.

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• How attach a model with another model on a specific bone?

  - by Mehdi Bugnard

  I meet a difficulty attached to a model to another model on a "bone" accurate. I searched several forums but no result. I saw that many people have asked the same question but no real result see no response. Thread found : How to attach two XNA models together? How can I attach a model to the bone of another model? http://stackoverflow.com/questions/11391852/attach-model-xna But I think it is possible. Here is my code example attached a "cube" of the hand of my player private void draw_itemActionAttached(Model modelInUse) { Matrix[] Model1TransfoMatrix = new Matrix[this.player.Model.Bones.Count]; this.player.Model.CopyAbsoluteBoneTransformsTo(Model1TransfoMatrix); foreach (ModelMesh mesh in modelInUse.Meshes) { foreach (BasicEffect effect in mesh.Effects) { Matrix model2Transform = Matrix.CreateScale(1f) * Matrix.CreateFromYawPitchRoll(0, 0, 0); effect.World = model2Transform * Model1TransfoMatrix[0]; //root bone index effect.View = arcadia.camera.View; effect.Projection = arcadia.camera.Projection; } mesh.Draw(); } }

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• Are log records removed from ldf file for rollbacks?

  - by TiborKaraszi

  Seems like a simple enough question, right? This question (but more targeted, read on) was raised in an MCT forum. While the discussion was on-going and and I tried to come up with answers, I realized that this question are really several questions. First, what is a rollback? I can see three different types of rollbacks (there might be more, of course): Regular rollback, as in ROLLBACK TRAN (or lost/terminated connection) Rollback done by restore recovery. I.e., end-time of backup included some transaciton...(read more)

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• Best practice in setting return value (use else or?)

  - by Deckard

  Whenever you want to return a value from a method, but whatever you return depends on some other value, you typically use branching: int calculateSomething() { if (a == b) { return x; } else { return y; } } Another way to write this is: int calculateSomething() { if (a == b) { return x; } return y; } Is there any reason to avoid one or the other? Both allow adding "else if"-clauses without problems. Both typically generate compiler errors if you add anything at the bottom. Note: I couldn't find any duplicates, although multiple questions exist about whether the accompanying curly braces should be on their own line. So let's not get into that.

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• What are some cool git or .gitignore tricks & best practices? [closed]

  - by 01walid

  Git is just awesome and fast VCS, however, knowing better this tool will help you incredibly increase your productivity and save your time. Here we can try to make a collection of tips, tricks and useful links to better take advantage of git, this question can have some more sub-questions, I mean: what are some usefull commands that reverse or rectify commits/adding/removing mistakes? what are .gitignore & Global .gitignore best practices? especially with private/secure files that contains passwords, api keys, local config and so on ... .gitignore first or git add <files> first? what are the advantages/disadvantages of both being the first/last. links to blog post, articles, would be sufficient. I thought every sub-question is not worthy opening a whole post each alone, I think centralizing these tips in one question post would help many people.

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• Google I/O 2010 - Customizing Google Apps

  Google I/O 2010 - Customizing Google Apps Google I/O 2010 - Customizing Google Apps & integrating with customer environments Enterprise 201 Mike O'Brien, Matt Pruden (Appirio), Adam Graff (Genentech), Don Dodge (moderator) Learn from real life examples of customizing Google Apps to meet customer requirements. Hear from the customer (Genentech) and the System Integrator (Appirio). Explore integration issues and deployment best practices with people who have done it. Get your questions answered in this session. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 6 0 ratings Time: 52:00 More in Science & Technology

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• gnome-control-center can't set display resolution under openbox

  - by Andy

  I'm running Ubuntu 11.10 with Openbox on my laptop. Since I need to plug different external displays into it and Openbox environment doesn't automatically pick them up, I thought the best solution I can come up with is to use gnome-control-center and it's display settings tool from within Openbox. But although this tool does detect monitors correctly, it can't do any change -- clicking Apply button just doesn't seem to do anything. So my questions are: 1) how to get this tool working? 2) how to run "Displays" tool directly from command-line, skipping control center? 3) is there a better way to automatically detect and set resolutions on internal/external monitors under Openbox? Please note I tried arandr too and it doesn't even work for my environment (doesn't detect external display plugging in at all). For what it's worth, my laptop is Lenovo G560, Ubuntu is x64 version with all the updates rolled over. Thanks for your consideration.

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• Understanding how to create/use textures for games when limited by power of two sizes

  - by Matthias Reisner

  I have some questions about the creating graphics for a game. As an example. I want to create a motorbike. (1pixel = 1centimeter) So my motorbike will have 200 width and 150 height. (200x150) But the libgdx only allows to load sizes with the power of 2?! (2,4,8,16,...) First I thought about that way. I will create my bike with the size (200x150) and save it as png. Than I will open it again (e.g. with gimp) resize the image to a size which uses values with power of 2 (128x128). I will load that as texture in the programm and set width as 200 and height as 150. But wouldn't it be a problem? Because I will lose some pixel information when I make the first conversation.?! Isn't it?

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• My linux server "Number of processes created" and "Context switches" are growing incredibly fast

  - by Jorge Fuentes González

  I have a strange behaviour in my server :-/. Is a OpenVZ VPS (I think is OpenVZ, because /proc/user_beancounters exists and df -h returns /dev/simfs drive. Also ifconfig returns venet0). When I do cat /proc/stat, I can see how each second about 50-100 processes are created and happens about 800k-1200k context switches! All that info is with the server completely idle, no traffic nor programs running. Top shows 0 load average and 100% idle CPU. I've closed all non-needed services (httpd, mysqld, sendmail, nagios, named...) and the problem still happens. I do ps -ALf each second too and I don't see any changes, only a new ps process is created each time and the PID is just the same as before + 1, so new processes are not created, so I thought that process growing in cat /proc/stat must be threads (Yes, seems that processes in /proc/stat counts threads creation too as this states: http://webcache.googleusercontent.com/search?q=cache:8NLgzKEzHQQJ:www.linuxhowtos.org/System/procstat.htm&hl=es&tbo=d&gl=es&strip=1). I've changed to /proc dir and done cat [PID]\status with all PIDs listed with ls (Including kernel ones) and in any process voluntary_ctxt_switches nor nonvoluntary_ctxt_switches are growing at the same speed as cat /proc/stat does (just a few tens/second), Threads keeps the same also. I've done strace -p PID to all process too so I can see if any process is crating threads or something but the only process that has a bit of movement is ssh and that movement is read/write operations because of the data is sending to my terminal. After that, I've done vmstat -s and saw that forks is growing at the same speed processes in /proc/stat does. As http://linux.die.net/man/2/fork says, each fork() creates a new PID but my server PID is not growing! The last thing I can think of is that all process data that proc/stat and vmstat -s show is shared with all the other VPS stored in the same machine, but I don't know if that is correct... If someone can throw some light on this I would be really grateful.

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• How does one pronounce "cron" as in "cron job"?

  - by Rooke

  Before someone ban-hammers this question as they do with all other pronunciation questions, let me explain its relevance. Verbal communication among co-workers and partners is important; today I was on a conference call with people discussing what I thought was something to do with "Chrome", as in Google Chrome. I pronounce the "cron" in "cron job" with a short O, much like "tron", "gone," or "pawn", but this individual pronouced it with a long O, as in "hone", "bone", or "stone" (notice the e at the end of all those!). Is there a standard pronunciation? Or is this a matter of opinion. For example, there's nothing ambiguous about the pronunciation of "Firefox", but debate is raging over "potato" and "tomato".

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• Application layer vs domain layer?

  - by Louis Rhys

  I am reading Domain-Driven Design by Evans and I am at the part discussing the layered architecture. I just realized that application and domain layers are different and should be separate. In the project I am working on, they are kind of blended and I can't tell the difference until I read the book (and I can't say it's very clear to me now), really. My questions, since both of them concerns the logic of the application and are supposed to be clean of technical and presentation aspects, what are the advantages of drawing a boundary these two?

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• Problems after installing Ubuntu 11.10

  - by Andrew Orr

  I'm having trouble with Ubuntu 11.10. It has to do with nomodeset. After I boot into Ubuntu, it goes to a purple screen for about 10 seconds and then goes blank. After that nothing happens. I've read other people's questions about this and I know it has to do with enabling nomodeset. This worked for me when I was using the LiveCD mode, but now Ubuntu is permanently installed as a dual-boot system. Going into recovery mode doesn't work, pressing "e" in the boot loader and writing nomodeset after quiet splash doesn't work either. Holding shift any time it's booting doesn't work. I don't know what to do anymore. I have an HP Pavilion dv6 laptop with an AMD A6-3400M CPU, and my GPU is an AMD Radeon HD 6520G. I've never worked with Linux before so taking me through this step-by-step would be great. Thanks!

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• Mac OS X : Open up 3 terminals, run different commands from all for each of them, to set up a develo

  - by taelor

  I'm a Ruby on Rails Web Developer and there is a lot of repetition I go through to start up my development environment. I was wondering if there is any way that I can remove some of this repetition by writing a script, or using a program (like quicksilver) or something to get my work environment going. I know how to use quicksilver to open up terminal, and I even have a saved window group to get my 3 or 4 panes open. The next thing I would love to automatically happen is getting all three to goto a certain directory, and each run different commands. One will start the local server, and in another tab, start a background process. the other would open text mate, and then start a console session, while the last one runs a svn(or git) status. Oh yah, and I would love to go ahead and open firefox, and a few tabs going to a couple of locations. Does anyone have any suggestions on how I could make all this happen in once quicksilver command, or a double click on some type of script on my Desktop?

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• How to setup an encrypted voip structure?

  - by strapakowsky

  What is the simplest way to set up a voip structure in a Linux machine with the following features: 1) Using free software 2) For computer-to-computer calls: end-to-end encryption set by the users, unpaid, no central authority (so skype is out) 3) For computer-to-phone calls: paid or unpaid, desirable encryption on the computer side if that is even possible 4) Ability to have a number to receive calls from regular phones My research concluded that the sip protocol is the most popular. However most discussions I've read on sip are too technical and I felt it discourages the regular user who wants to just click and talk. So I put the question above and created some separate questions about privacy with sip registrars, privacy with voip suppliers, what to look for in a sip registrar, what to look for in a voip provider. As for the software, I noticed most software either don't provide encryption (eg Ekiga) or the software doesn't work nicely and the project is abandoned (eg Twinkle), so no option seemed satisfying.

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• Unit testing - getting started

  - by higgenkreuz

  I am just getting started with unit testing but I am not sure if I really understand the point of it all. I read tutorials and books on it all, but I just have two quick questions: I thought the purpose of unit testing is to test code we actually wrote. However, to me it seems that in order to just be able to run the test, we have to alter the original code, at which point we are not really testing the code we wrote but rather the code we wrote for testing. Most of our codes rely on external sources. Upon refactoring our code however, even it would break the original code, our tests still would run just fine, since the external sources are just muck-ups inside our test cases. Doesn't it defeat the purpose of unit testing? Sorry if I sound dumb here, but I thought someone could enlighten me a bit. Thanks in advance.

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• Day 2 of Oracle OpenWorld 2012 October 1st

  - by Maria Colgan

  Oracle OpenWorld started yesterday and San Francisco is just buzzing with Oracle folks! If you are attending the conference don't miss the opportunity to chat with the Optimizer development team at one of our technical sessions or at the Oracle Demo grounds. Our first technical session(Session CON8455) happens tomorrow at 1:15pm but the Oracle Optimizer Demo booth opens today. We are located in the database demo grounds, in Moscone South, booth number 3157. Members of the Optimizer team will be available from 9:45am to 6pm today, to answer any Optimizer questions you might have and of course to dole out our limited edition Optimizer bumper stickers! The must have souvenir from this years conference +Maria Colgan

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• with nginx having the base url rewrite to https

  - by jchysk

  I'd like only my base domain www.domain.com to be rewritten to https://www.domain.com By default in my https block I have it reroute to http:// if it's not ~uri = "/" (base domain) or static content. server { listen 443; set $ssltoggle 2; if ($uri ~ ^/(img|js|css|static)/) { set $ssltoggle 1; } if ($uri = '/') { set $ssltoggle 1; } if ($ssltoggle != 1) { rewrite ^(.*)$ http://$server_name$1 permanent; } } So in my http block I need to do the rewrite if it has to https: server { listen 80; if ($uri = '/') { set $ssltoggle 1; } if ($ssltoggle = 1) { rewrite ^(.*)$ https://$server_name$1 permanent; } } If I don't have the $uri = '/' if-statement in the http block, then https works fine if I go directly to it, but I won't get redirected if I go to regular http which is expected. If I do put that in-statement in the http block then everything stops working within minutes. It might work for a few requests, but will always stop within a minute or so. In browsers I just get a blank page for all requests. If I restart nginx it continues to not work until I remove both if-statement blocks in both the https and http blocks and restart nginx. When I look in the error logs I don't see anything logged. When I look in the access log I see this message: "-" 400 0 "-" "-" which I assume means a 400 error. I don't understand why this doesn't work for me. My end goal is to have the base domain be https-only while all other pages default to http. How can I achieve this?

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• No Homegroup Computers, Network Troubleshooter Fails

  - by Mokubai

  I have a problem with my Windows 7 Homegroup, between two Windows 7 Home Premium machines. On one machine I get this: The other machine in the Homegroup is perfectly happy and is able to see and browse this faulty machine as if there is nothing wrong. The Network and Sharing Center shows that I am joined to a Homegroup on my "Home" network and nothing is out of the ordinary. I have tried leaving the Homegroup and rejoining/recreating it several times and that does nothing at all. Normal browsing to machine names and looking through folders seems to work, but it's a much more clunky way to get stuff compared to the convenience of the Homegroup facilities. Starting the troubleshooter detects some problems with a "Peer Networking" (PNRpr or something like that) service not starting but fails to fix anything. Sure enough when I go to view the services via Control Panel - Administrative Tools - Services I see that both the "Peer Name Resolution Protocol" and "Peer Networking Grouping" services are stopped. Attempting to start the "Peer Networking Grouping" gives an error that a dependency service will not start, the only service it is dependant on is the "Peer Name Resolution Protocol" so I try to start that and I get an error saying that the "service could not start due to error 0x80630801" This has happened before and I have fixed it then by using System Restore and restoring the machine to a week before when I knew it had all worked. This time though I cannot remember when I last used the Homegroup from this machine and I've installed quite a bit so I don't want to go fumbling through restore points trying to find one that works... Can anyone tell me if there is a way to reset things so that this machine is able to use the Homegroup again?

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• Ubuntu studio/xubuntu 12.04 instead of Ubuntu 12.04/12.10 for CAD/ arhcitectural workflow. Worth it?

  - by gabriel

  I am currently using Ubuntu 12.10. So, as described in the title I am planning to install Ubuntu studio. The programs i use are Blender, Maya 2013, NukeX, Bricscad, Sketchup (with wine) and also i am planning to install revit architecture through VirtualBox. Well, I am using a quad-core CPU and i want to have all the power of my system for rendering/modelling. So, i decided to try a more lightweight desktop than unity. Also, what made me to decide this, is that when i tried to install Bricscad v12 the program does not work. So, i thought that if i want something more professional for my work i should have only LTS versions of lightweight Ubuntu. So, my 2 questions are :1) Worth it? 2) Can i have global menu(close,minimize,maximize buttons, menu) like ubuntu/unity? Thanks

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• Best shortcut in Total Commander

  - by life-warrior

  So, what's your favourite TC shortcut or shortcut combination ? Which one do you use and for what purpose ? Among my most often used: Ctrl-Left ( or Ctrl-Right ) - open archive or folder under cursor in opposite tab. Ctrl-Shift-Enter, Alt-F8, Ctrl-X - copy full file path to clipboard. Shift-F6, Shift-End(if needed), Ctrl-C - copy only file name w/o path. Select files, Ctrl-M - multi-rename, for example remove "DVDrip" from file names. Ctrl-\ - go to root directory. Ctrl-D, - go to directory with highlighted letter specified. For example, name a downloads directory "&Downloads" in favourites, and the letter after ampersand will be highlighted. Alt-F7, feed to listbox, Ctrl-A, Mark(menu)-Save selection to file - creates a file with all files and directories inside current, with full path. Ctrl-[3-6] - sort files by name(3), extension(4), date(5), size(6). For example, Sort by name, when you need movies and soundracks with the same name and different extension to group them together. Sort by extension, when you need to find EXEs in Windows directory. Sort by Date, when you need to find the latest file downloaded in your dir. Sort by size, when you need to delete the largest files for free space.

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• Udacity: Teaching thousands of students to program online using App Engine

  Udacity: Teaching thousands of students to program online using App Engine Join Fred Sauer & Iein Valdez as they talk with Steve Huffman, founder of Reddit and Hipmunk, and Chris Chew, senior software engineer at Udacity. Steve will share his experience teaching a course on web development using App Engine at Udacity, and Chris will talk about his experience building Udacity itself using App Engine. Submit your questions for Steve and Chris to answer live on air. From: GoogleDevelopers Views: 0 0 ratings Time: 00:00 More in Science & Technology

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• How do I fix DNS resolving which doesn't work after upgrading to Ubuntu 13.10 (Saucy)

  - by Witek

  After upgrade to 13.10 my DNS resolving fails. It seams the DNS servers which I get by DHCP (LAN) are not used. I could temporary solve the problem by adding nameserver 8.8.8.8 to /etc/resolv.conf. But then the intranet hosts still can not be resolved. When clicking on the Connection Information menu item on the network indicator, the Primary DNS and the Secondary DNS are set correctly. But my computer seams not to use them. So my questions: What should I put into resolv.conf, if anything? How to find out, which name servers my computer is querying? Where to look next, to find out, why name servers received by DHCP are not used?

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