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• Package system broken - E: Sub-process /usr/bin/dpkg returned an error code (1)

  - by delha

  After installing some packages and libraries I have an error on Package Manager, I can't run any update because it says: "The package system is broken If you are using third party repositories then disable them, since they are a common source of problems. Now run the following command in a terminal: apt-get install -f " I've tried to do what it says and it returns me: jara@jara-Aspire-5738:~$ sudo apt-get install -f Reading package lists... Done Building dependency tree Reading state information... Done Correcting dependencies... Done The following packages were automatically installed and are no longer required: libcaca-dev libopencv2.3-bin nite-dev python-bluez ps-engine libslang2-dev python-sphinx ros-electric-geometry-tutorials ros-electric-geometry-visualization python-matplotlib libzzip-dev ros-electric-orocos-kinematics-dynamics ros-electric-physics-ode libbluetooth-dev libaudiofile-dev libassimp2 libnetpbm10-dev ros-electric-laser-pipeline python-epydoc ros-electric-geometry-experimental libasound2-dev evtest python-matplotlib-data libyaml-dev ros-electric-bullet ros-electric-executive-smach ros-electric-documentation libgl2ps0 libncurses5-dev ros-electric-robot-model texlive-fonts-recommended python-lxml libwxgtk2.8-dev daemontools libxxf86vm-dev libqhull-dev libavahi-client-dev ros-electric-geometry libgl2ps-dev libcurl4-openssl-dev assimp-dev libusb-1.0-0-dev libopencv2.3 ros-electric-diagnostics-monitors libsdl1.2-dev libjs-underscore libsdl-image1.2 tipa libusb-dev libtinfo-dev python-tz python-sip libfltk1.1 libesd0 libfreeimage-dev ros-electric-visualization x11proto-xf86vidmode-dev python-docutils libvtk5.6 ros-electric-assimp x11proto-scrnsaver-dev libnetcdf-dev libidn11-dev libeigen3-dev joystick libhdf5-serial-1.8.4 ros-electric-joystick-drivers texlive-fonts-recommended-doc esound-common libesd0-dev tcl8.5-dev ros-electric-multimaster-experimental ros-electric-rx libaudio-dev ros-electric-ros-tutorials libwxbase2.8-dev ros-electric-visualization-common python-sip-dev ros-electric-visualization-tutorials libfltk1.1-dev libpulse-dev libnetpbm10 python-markupsafe openni-dev tk8.5-dev wx2.8-headers freeglut3-dev libavahi-common-dev python-roman python-jinja2 ros-electric-robot-model-visualization libxss-dev libqhull5 libaa1-dev ros-electric-eigen freeglut3 ros-electric-executive-smach-visualization ros-electric-common-tutorials ros-electric-robot-model-tutorials libnetcdf6 libjs-sphinxdoc python-pyparsing libaudiofile0 Use 'apt-get autoremove' to remove them. The following extra packages will be installed: libcv-dev The following NEW packages will be installed libcv-dev 0 upgraded, 1 newly installed, 0 to remove and 4 not upgraded. 2 not fully installed or removed. Need to get 0 B/3,114 kB of archives. After this operation, 11.1 MB of additional disk space will be used. Do you want to continue [Y/n]? y (Reading database ... 261801 files and directories currently installed.) Unpacking libcv-dev (from .../libcv-dev_2.1.0-7build1_amd64.deb) ... dpkg: error processing /var/cache/apt/archives/libcv-dev_2.1.0-7build1_amd64.deb (-- unpack): trying to overwrite '/usr/bin/opencv_haartraining', which is also in package libopencv2.3-bin 2.3.1+svn6514+branch23-12~oneiric dpkg-deb: error: subprocess paste was killed by signal (Broken pipe) Errors were encountered while processing: /var/cache/apt/archives/libcv-dev_2.1.0-7build1_amd64.deb E: Sub-process /usr/bin/dpkg returned an error code (1) I've tried everything people recommend on internet like: sudo apt-get clean sudo apt-get autoremove sudo apt-get update sudo apt-get upgrade sudo apt-get -f install Also I've tried to install the synaptic manager but it doesn't let me install anything.. As you can see nothing works so I'm desperate! I'm using ubuntu 11.10, 64 bits Thanks!!

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• Java Spotlight Episode 75: Greg Luck on JSR 107 Java Temporary Caching API

  - by Roger Brinkley

  Tweet Recorded live at Jfokus 2012, an interview with Greg Luck on JSR 107 Java Temporary Caching API. Joining us this week on the Java All Star Developer Panel is Alexis Moussine-Pouchkine, Java EE Developer Advocate. Right-click or Control-click to download this MP3 file. You can also subscribe to the Java Spotlight Podcast Feed to get the latest podcast automatically. If you use iTunes you can open iTunes and subscribe with this link:  Java Spotlight Podcast in iTunes. Show Notes News JavaOne 2012 call for papers is open (closes April 9th) LightFish, Adam Bien's lightweight telemetry application Java EE 6 sample code JavaFX 1.2 and 1.3 EOL Repeating Annotations in the Works Events March 26-29, EclipseCon, Reston, USA March 27, Virtual Developer Days - Java (Asia Pacific (English)),9:30 am to 2:00pm IST / 12:00pm to 4.30pm SGT  / 3.00pm - 7.30pm AEDT April 4-5, JavaOne Japan, Tokyo, Japan April 12, GreenJUG, Greenville, SC April 17-18, JavaOne Russia, Moscow Russia April 18–20, Devoxx France, Paris, France April 26, Mix-IT, Lyon, France, May 3-4, JavaOne India, Hyderabad, India Feature Interview Greg Luck founded Ehcache in 2003. He regularly speaks at conferences, writes and codes. He has also founded and maintains the JPam and Spnego open source projects, which are security focused. Prior to joining Terracotta in 2009, Greg was Chief Architect at Wotif.com where he provided technical leadership as the company went from a single product startup to a billion dollar public company with multiple product lines. Before that Greg was a consultant for ThoughtWorks with engagements in the US and Australia in the travel, health care, geospatial, banking and insurance industries. Before doing programming, Greg managed IT. He was CIO at Virgin Blue, Tempo Services, Stamford Hotels and Resorts and Australian Resorts. He is a Chartered Accountant, and spent 7 years with KPMG in small business and insolvency. Mail Bag What’s Cool RT @harkje: To update an earlier tweet: #JavaFX feels like Swing with added convenience methods, better looking widgets, nice effects and...

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• Alternative to sql NOT IN?

  - by Alex

  Hi, I am trying to make a materialized view in Oracle (I am a newbie, btw). For some reason, it doesn't like the presence of sub-query in it. I've been trying to use LEFT OUTER JOIN instead, but it's returning different data set now. Put simply, here's the code I'm trying to modify: SELECT * FROM table1 ros, table2 bal, table3 flx WHERE flx.name = 'XXX' AND flx.value = bal.value AND NVL (ros.ret, 'D') = Nvl (flx.attr16, 'D') AND ros.value = bal.segment3 AND ros.type IN ( 'AL', 'AS', 'PL' ) AND bal.period = 13 AND bal.code NOT IN (SELECT bal1.code FROM table2 bal1 WHERE bal1.value = flx.value AND bal1.segment3 = ros.value AND bal1.flag = bal.flag AND bal1.period = 12 AND bal1.year = bal.year) And here's one of my attempt: SELECT * FROM table1 ros, table2 bal, table3 flx LEFT OUTER JOIN table2 bal1 ON bal.code = bal1.code WHERE bal1.code is null AND bal1.segment3 = ros.value AND bal.segment3 = ros.value AND bal1.flag = bal.flag AND bal1.year = bal.year AND flx.name = 'XXX' AND flx.value = bal.value AND bal1.value = flx.value AND bal1.period_num = 12 AND NVL (ros.type, 'D') = NVL (flx.attr16, 'D') AND ros.value = bal.segment3 AND ros.type IN ( 'AL', 'AS', 'PL' ) AND bal.period = 13; This drives me nuts! Thanks in advance for the help :)

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• Mirroring git and mercurial repos the lazy way

  - by Greg Malcolm

  I maintain Python Koans on mirrored on both Github using git and Bitbucket using mercurial. I get pull requests from both repos but it turns out keeping the two repos in sync is pretty easy. Here is how it's done... Assuming I’m starting again on a clean laptop, first I clone both repos ~/git $ hg clone https://bitbucket.org/gregmalcolm/python_koans ~/git $ git clone [email protected]:gregmalcolm/python_koans.git python_koans2 The only thing that makes a folder a git or mercurial repository is the .hg folder in the root of python_koans and the .git folder in the root of python_koans2. So I just need to move the .git folder over into the python_koans folder I'm using for mercurial: ~/git $ rm -rf python_koans/.git ~/git $ mv python_koans2/.git python_koans ~/git $ ls -la python_koans total 48 drwxr-xr-x 11 greg staff 374 Mar 17 15:10 . drwxr-xr-x 62 greg staff 2108 Mar 17 14:58 .. drwxr-xr-x 12 greg staff 408 Mar 17 14:58 .git -rw-r--r-- 1 greg staff 34 Mar 17 14:54 .gitignore drwxr-xr-x 13 greg staff 442 Mar 17 14:54 .hg -rw-r--r-- 1 greg staff 48 Mar 17 14:54 .hgignore -rw-r--r-- 1 greg staff 365 Mar 17 14:54 Contributor Notes.txt -rw-r--r-- 1 greg staff 1082 Mar 17 14:54 MIT-LICENSE -rw-r--r-- 1 greg staff 5765 Mar 17 14:54 README.txt drwxr-xr-x 10 greg staff 340 Mar 17 14:54 python 2 drwxr-xr-x 10 greg staff 340 Mar 17 14:54 python 3 That’s about it! Now git and mercurial are tracking files in the same folder. Of course you will still need to set up your .gitignore to ignore mercurial’s dotfiles and .hgignore to ignore git’s dotfiles or there will be squabbling in the backseat. ~/git $ cd python_koans/ ~/git/python_koans $ cat .gitignore *.pyc *.swp .DS_Store answers .hg <-- Ignore mercurial ~/git/python_koans $ cat .hgignore syntax: glob *.pyc *.swp .DS_Store answers .git <-- Ignore git Because both my mirrors are both identical as far as tracked files are concerned I won’t yet see anything if I check statuses at this point: ~/git/python_koans $ git status # On branch master nothing to commit (working directory clean) ~/git/python_koans $ hg status ~/git/python_koans But how about if I accept a pull request from the bitbucket (mercuial) site? ~/git/python_koans $ hg status ~/git/python_koans $ git status # On branch master # Your branch is behind 'origin/master' by 1 commit, and can be fast-forwarded. # # Changed but not updated: # (use "git add <file>..." to update what will be committed) # (use "git checkout -- <file>..." to discard changes in working directory) # # modified: python 2/koans/about_decorating_with_classes.py # modified: python 2/koans/about_iteration.py # modified: python 2/koans/about_with_statements.py # modified: python 3/koans/about_decorating_with_classes.py # modified: python 3/koans/about_iteration.py # modified: python 3/koans/about_with_statements.py Mercurial doesn’t have any changes to track right now, but git has changes. Commit and push them up to github and balance is restored to the force: ~/git/python_koans $ git commit -am "Merge from bitbucket mirror: 'gpiancastelli - Fix for issue #21 and some other tweaks'" [master 79ca184] Merge from bitbucket mirror: 'gpiancastelli - Fix for issue #21 and some other tweaks' 6 files changed, 78 insertions(+), 63 deletions(-) ~/git/python_koans $ git push origin master Or just use hg-git? The github developers have actually published a plugin for automatic mirroring: http://hg-git.github.com I haven’t used it because at the time I tried it a couple of years ago I was having problems getting all the parts to play nice with each other. Probably works fine now though..

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• Postfix not delivering email using Maildir

  - by Greg K

  I've followed this guide to get postfix set up. I've not completed it yet, as from sending test emails, email is no longer being delivered since switching to Maildir from mbox. I have created a Maildir directory with cur, new and tmp sub directories. ~$ ll drwxrwxr-x 5 greg greg 4096 2012-07-07 16:40 Maildir/ ~$ ll Maildir/ drwxrwxr-x 2 greg greg 4096 2012-07-07 16:40 cur drwxrwxr-x 2 greg greg 4096 2012-07-07 16:40 new drwxrwxr-x 2 greg greg 4096 2012-07-07 16:40 tmp Send a test email. ~$ netcat mail.example.com 25 220 ubuntu ESMTP Postfix (Ubuntu) ehlo example.com 250-ubuntu 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-STARTTLS 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN mail from: [email protected] 250 2.1.0 Ok rcpt to: [email protected] 250 2.1.5 Ok data 354 End data with <CR><LF>.<CR><LF> Subject: test email Hi, Just testing. . 250 2.0.0 Ok: queued as 56B541EA53 quit 221 2.0.0 Bye Check the mail queue. ~$ mailq Mail queue is empty Check if mail has been delivered. ~$ ls -l Maildir/new total 0 Some postfix settings: ~$ sudo postconf home_mailbox home_mailbox = Maildir/ ~$ sudo postconf mailbox_command mailbox_command = /var/log/mail.log Jul 7 16:57:33 li305-246 postfix/smtpd[21039]: connect from example.com[178.79.168.xxx] Jul 7 16:58:14 li305-246 postfix/smtpd[21039]: 56B541EA53: client=example.com[178.79.168.xxx] Jul 7 16:58:33 li305-246 postfix/cleanup[21042]: 56B541EA53: message-id=<20120707155814.56B541EA53@ubuntu> Jul 7 16:58:33 li305-246 postfix/qmgr[20882]: 56B541EA53: from=<[email protected]>, size=321, nrcpt=1 (queue active) Jul 7 16:58:33 li305-246 postfix/smtp[21043]: 56B541EA53: to=<[email protected]>, relay=none, delay=30, delays=30/0.01/0/0, dsn=5.4.6, status=bounced (mail for example.com loops back to myself) Jul 7 16:58:33 li305-246 postfix/cleanup[21042]: 1F68B1EA55: message-id=<20120707155833.1F68B1EA55@ubuntu> Jul 7 16:58:33 li305-246 postfix/bounce[21044]: 56B541EA53: sender non-delivery notification: 1F68B1EA55 Jul 7 16:58:33 li305-246 postfix/qmgr[20882]: 1F68B1EA55: from=<>, size=1999, nrcpt=1 (queue active) Jul 7 16:58:33 li305-246 postfix/qmgr[20882]: 56B541EA53: removed Jul 7 16:58:33 li305-246 postfix/smtp[21043]: 1F68B1EA55: to=<[email protected]>, relay=none, delay=0, delays=0/0/0/0, dsn=5.4.6, status=bounced (mail for example.com loops back to myself) Jul 7 16:58:33 li305-246 postfix/qmgr[20882]: 1F68B1EA55: removed Jul 7 16:58:36 li305-246 postfix/smtpd[21039]: disconnect from domain.me[178.79.168.xxx] Jul 7 17:10:38 li305-246 postfix/master[20878]: terminating on signal 15 Jul 7 17:10:39 li305-246 postfix/master[21254]: daemon started -- version 2.8.5, configuration /etc/postfix Any ideas?

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• How to resolve symbolic links in a shell script

  - by Greg Hewgill

  Given an absolute or relative path (in a Unix-like system), I would like to determine the full path of the target after resolving any intermediate symlinks. Bonus points for also resolving ~username notation at the same time. If the target is a directory, it might be possible to chdir() into the directory and then call getcwd(), but I really want to do this from a shell script rather than writing a C helper. Unfortunately, shells have a tendency to try to hide the existence of symlinks from the user (this is bash on OS X): $ ls -ld foo bar drwxr-xr-x 2 greg greg 68 Aug 11 22:36 bar lrwxr-xr-x 1 greg greg 3 Aug 11 22:36 foo -> bar $ cd foo $ pwd /Users/greg/tmp/foo $ What I want is a function resolve() such that when executed from the tmp directory in the above example, resolve("foo") == "/Users/greg/tmp/bar".

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• How to upgrade boost lib using apt-get?

  - by sam

  I use ubuntu 11.04. My boost version: sam@sam:~/code/ros/pcl$ apt-cache showpkg libboost-all-dev Package: libboost-all-dev Versions: 1.42.0.1ubuntu1 (/var/lib/apt/lists/tw.archive.ubuntu.com_ubuntu_dists_natty_universe_binary-amd64_Packages) (/var/lib/dpkg/status) Description Language: File: /var/lib/apt/lists/tw.archive.ubuntu.com_ubuntu_dists_natty_universe_binary-amd64_Packages MD5: 72efad05a3c79394c125b79e1d4eb3a7 Reverse Depends: libvtk5-dev,libboost-all-dev libfeel++-dev,libboost-all-dev Dependencies: 1.42.0.1ubuntu1 - libboost-dev (0 (null)) libboost-date-time-dev (0 (null)) libboost-filesystem-dev (0 (null)) libboost-graph-dev (0 (null)) libboost-iostreams-dev (0 (null)) libboost-math-dev (0 (null)) libboost-program-options-dev (0 (null)) libboost-python-dev (0 (null)) libboost-regex-dev (0 (null)) libboost-serialization-dev (0 (null)) libboost-signals-dev (0 (null)) libboost-system-dev (0 (null)) libboost-test-dev (0 (null)) libboost-thread-dev (0 (null)) libboost-wave-dev (0 (null)) Provides: 1.42.0.1ubuntu1 - Reverse Provides: sam@sam:~/code/ros/pcl$ How to upgrade boost to 1.44+ by using apt tools? Thank you~ When I run apt-add-repository,it shows: sam@sam:~/code/ros/pcl$ sudo apt-add-repository ppa:timklingt/ppa Error reading https://launchpad.net/api/1.0/~timklingt/+archive/ppa: GnuTLS recv error (-9): A TLS packet with unexpected length was received. sam@sam:~/code/ros/pcl$ How to fix it? Thank you~ I try to install libboost1.46-all-dev: sam@sam:~/code/ros/pcl$ sudo apt-get install libboost1.46-all-dev Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: libboost1.46-all-dev : Depends: libboost1.46-dev but it is not going to be installed Depends: libboost-date-time1.46-dev but it is not going to be installed Depends: libboost-filesystem1.46-dev but it is not going to be installed Depends: libboost-graph1.46-dev but it is not going to be installed Depends: libboost-iostreams1.46-dev but it is not going to be installed Depends: libboost-math1.46-dev but it is not going to be installed Depends: libboost-program-options1.46-dev but it is not going to be installed Depends: libboost-python1.46-dev but it is not going to be installed Depends: libboost-regex1.46-dev but it is not going to be installed Depends: libboost-serialization1.46-dev but it is not going to be installed Depends: libboost-signals1.46-dev but it is not going to be installed Depends: libboost-system1.46-dev but it is not going to be installed Depends: libboost-test1.46-dev but it is not going to be installed Depends: libboost-thread1.46-dev but it is not going to be installed Depends: libboost-wave1.46-dev but it is not going to be installed E: Broken packages sam@sam:~/code/ros/pcl$ What's these error means? And how to solve it? Thank you~

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• nodejs daemon wrong architecture

  - by Greg Pagendam-Turner

  I'm trying to run 'dali' a highcharts exporter from nodejs on my Mac under OSX Mountain Lion I'm getting the following error: module.js:485 process.dlopen(filename, module.exports); ^ Error: dlopen(/Users/greg/node_modules/daemon/lib/daemon.v0.8.8.node, 1): no suitable image found. Did find: /Users/greg/node_modules/daemon/lib/daemon.v0.8.8.node: mach-o, but wrong architecture at Object.Module._extensions..node (module.js:485:11) at Module.load (module.js:356:32) at Function.Module._load (module.js:312:12) at Module.require (module.js:362:17) at require (module.js:378:17) at Object.<anonymous> (/Users/greg/node_modules/daemon/lib/daemon.js:12:11) at Module._compile (module.js:449:26) at Object.Module._extensions..js (module.js:467:10) at Module.load (module.js:356:32) at Function.Module._load (module.js:312:12) The key part is: "wrong architecture" If I run: lipo -info /Users/greg/node_modules/daemon/lib/daemon.v0.8.8.node It returns: Non-fat file: /Users/greg/node_modules/daemon/lib/daemon.v0.8.8.node is architecture: i386 I'm guessing a x64 version is requried. How do I get and install the 64 bit version of this lib?

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• This Isn’t Hard: Allow Spouses to Attend Conferences

  - by andyleonard

  There was a bit of a hubbub at Tech Ed 2013 North America . It began with generalized disorganization, escalated when site security escorted Greg Young’s ( blog | @gregyoung ) wife from the building, and ended with him cancelling his presentations at both the North American and European conferences. Greg’s post has generated some responses, but – according to him – nothing from Microsoft. That’s disappointing. Greg and his wife deserve an apology. Why Not? The best conferences I’ve attended (I’m...(read more)

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• CQRS &ndash; Questions and Concerns

  - by Dylan Smith

  I’ve been doing a lot of learning on CQRS and Event Sourcing over the last little while and I have a number of questions that I haven’t been able to answer. 1. What is the benefit of CQRS when compared to a typical DDD architecture that uses Event Sourcing and properly captures intent and behavior via verb-based commands? (other than Scalability) 2. When using CQRS what do you do with complex query-based logic? I’m going to elaborate on #1 in this blog post and I’ll do a follow-up post on #2. I watched through Greg Young’s video on the business benefits of CQRS + Event Sourcing and first let me say that I thought it was an excellent presentation that really drives home a lot of the benefits to this approach to architecture (I watched it twice in a row I enjoyed it so much!). But it didn’t answer some of my questions fully (I wish I had been there to ask these of Greg in person!). So let me pick apart some of the points he makes and how they relate to my first question above. I’m completely sold on the idea of event sourcing and have a clear understanding of the benefits that it brings to the table, so I’m not going to question that. But you can use event sourcing without going to a CQRS architecture, so my main question is around the benefits of CQRS + Event Sourcing vs Event Sourcing + Typical DDD architecture Architecture with Event Sourcing + Commands on Left, CQRS on Right Greg talks about how the stereotypical architecture doesn’t support DDD, but is that only because his diagram shows DTO’s coming up from the client. If we use the same diagram but allow the client to send commands doesn’t that remove a lot of the arguments that Greg makes against the stereotypical architecture? We can now introduce verbs into the system. We can capture intent now (storing it still requires event sourcing, but you can implement event sourcing without doing CQRS) We can create a rich domain model (as opposed to an anemic domain model) Scalability is obviously a benefit that CQRS brings to the table, but like Greg says, very few of the systems we create truly need significant scalability Greg talks about the ability to scale your development efforts. He says CQRS allows you to split the system into 3 parts (Client, Domain/Commands, Reads) and assign 3 teams of developers to work on them in parallel; letting you scale your development efforts by 3x with nearly linear gains. But in the stereotypical architecture don’t you already have 2 separate modules that you can split your dev efforts between: The client that sends commands/queries and receives DTO’s, and the Domain which accepts commands/queries, and generates events/DTO’s. If this is true it’s not really a 3x scaling you achieve with CQRS but merely a 1.5x scaling which while great doesn’t sound nearly as dramatic (“I can do it with 10 devs in 12 months – let me hire 5 more and we can have it done in 8 months”). Making the Query side “stupid simple” such that you can assign junior developers (or even outsource it) sounds like a valid benefit, but I have some concerns over what you do with complex query-based logic/behavior. I’m going to go into more detail on this in a follow-up blog post shortly. He also seemed to focus on how “stupid-simple” it is doing queries against the de-normalized data store, but I imagine there is still significant complexity in the event handlers that interpret the events and apply them to the de-normalized tables. It sounds like Greg suggests that because we’re doing CQRS that allows us to apply Event Sourcing when we otherwise wouldn’t be able to (~33:30 in the video). I don’t believe this is true. I don’t see why you wouldn’t be able to apply Event Sourcing without separating out the Commands and Queries. The queries would just operate against the domain model instead of the database. But you’d still get the benefits of Event Sourcing. Without CQRS the queries would only be able to operate against the current state rather than the event history, but even in CQRS the domain behaviors can only operate against the current state and I don’t see that being a big limiting factor. If some query needs to operate against something that is not captured by the current state you would just have to update the domain model to capture that information (no different than if that statement were made about a Command under CQRS). Some of the benefits I do see being applicable are that your domain model might end up being simpler/smaller since it only needs to represent the state needed to process commands and not worry about the reads (like the Deactivate Inventory Item and associated comment example that Greg provides). And also commands that can be handled in a Transaction Script style manner by the command handler simply generating events and not touching the domain model. It also makes it easier for your senior developers to focus on the command behavior and ignore the queries, which is usually going to be a better use of their time. And of course scalability. If anybody out there has any thoughts on this and can help educate me further, please either leave a comment or feel free to get in touch with me via email:

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• Cannot right click with synaptics touchpad

  - by fluteflute

  I have a Sony VAIO E14. The touchpad detects all clicks as Left clicks. In Windows 7, pressing on the right side of the touchpad is recognised as a right click. How can I enable right clicking? greg@greg-SVE14A1C5E:~$ xinput ? Virtual core pointer id=2 [master pointer (3)] ? ? Virtual core XTEST pointer id=4 [slave pointer (2)] ? ? SynPS/2 Synaptics TouchPad id=11 [slave pointer (2)] ... greg@greg-SVE14A1C5E:~$ grep "TouchPad: buttons:" /var/log/Xorg.0.log [ 23.112] (--) synaptics: SynPS/2 Synaptics TouchPad: buttons: left double triple

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• SVN checkout returns 400 error

  - by eboix

  I'm trying to download the http://code.opencv.org/svn/opencv/trunk/ repository of all of the OpenCV source code - as specified in an OpenCV installation tutorial. In the tutorial, the repository https://code.ros.org/svn/opencv/trunk/ is used, but they moved it to http://code.opencv.org/svn/opencv/trunk/, and now you need a password to access the code.ros.org repository. Anyway, I'm using TortoiseSVN to download the SVN repository. (I get the same error with http://sourceforge.net/projects/win32svn/) I get this: Checkout from http://code.opencv.org/svn/opencv/trunk, revision HEAD, Fully recursive, Externals included Server sent unexpected return value (400 Bad request. Method Unknown) in response to REPORT request for '/svn/opencv/!svn/vcc/default' On the TortoiseSVN site I found something about this 400 error: You're behind a firewall which blocks DAV requests. Most firewalls do that. Either ask your Administrator to change the firewall, or access the repository with https:// instead of http:// like in https://svn.collab.net/repos/svn/ That way you connect to the repository with SSL encryption, which firewalls can't interfere with (if they don't block the SSL port completely). Also some virus scanners (i.e. Kapersky) are known to interfere and cause this error. The code.ros.org repository is https://, so I would be able to access it, but I need a password, so I can't. I made an account on ros.org, but it seems that I still need a password (which I don't know) to access the code repository. My username-password combination does not work. I unblocked all of the TortoiseSVN programs in my firewall settings. Nothing changed. I temporarily stopped my firewall to see if it was interfering with my request. I got the same error. How can I do an svn checkout http://code.opencv.org/svn/opencv/trunk/opencv/ so that I don't get this error? Is there any way to make it https://? Any help would be appreciated!

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• Extend Your Applications Your Way: Oracle OpenWorld Live Poll Results

  - by Applications User Experience

  Lydia Naylor, Oracle Applications User Experience Manager At OpenWorld 2012, I attended one of our team’s very exciting sessions: “Extend Your Applications, Your Way”. It was clear that customers were engaged by the topics presented. Not only did we see many heads enthusiastically nodding in agreement during the presentation, and witness a large crowd surround our speakers Killian Evers, Kristin Desmond and Greg Nerpouni afterwards, but we can prove it…with data! Figure 1. Killian Evers, Kristin Desmond, and Greg Nerpouni of Oracle at the OOW 2012 session. At the beginning of our OOW 2012 journey, Greg Nerpouni, Fusion HCM Principal Product Manager, told me he really wanted to get feedback from the audience on our extensibility direction. Initially, we were thinking of doing a group activity at the OOW UX labs events that we hold every year, but Greg was adamant- he wanted “real-time” feedback. So, after a little tinkering, we came up with a way to use an online survey tool, a simple QR code (Quick Response code: a matrix barcode that can include information like URLs and can be read by mobile device cameras), and the audience’s mobile devices to do just that. Figure 2. Actual QR Code for survey Prior to the session, we developed a short survey in Vovici (an online survey tool), with questions to gather feedback on certain points in the presentation, as well as demographic data from our participants. We used Vovici’s feature to generate a mobile HTML version of the survey. At the session, attendees accessed the survey by simply scanning a QR code or typing in a TinyURL (a shorthand web address that is easily accessible through mobile devices). Killian, Kristin and Greg paused at certain points during the session and asked participants to answer a few survey questions about what they just presented. Figure 3. Session survey deployed on a mobile phone The nice thing about Vovici’s survey tool is that you can see the data real-time as participants are responding to questions - so we knew during the session that not only was our direction on track but we were hitting the mark and fulfilling Greg’s request. We planned on showing the live polling results to the audience at the end of the presentation but it ran just a little over time, and we were gently nudged out of the room by the session attendants. We’ve included a quick summary below and this link to the full results for your enjoyment. Figure 4. Most important extensions to Fusion Applications So what did participants think of our direction for extensibility? A total of 94% agreed that it was an improvement upon their current process. The vast majority, 80%, concurred that the extensibility model accounts for the major roles involved: end user, business systems analyst and programmer. Attendees suggested a few supporting roles such as systems administrator, data architect and integrator. Customers and partners in the audience verified that Oracle‘s Fusion Composers allow them to make changes in the most common areas they need to: user interface, business processes, reporting and analytics. Integrations were also suggested. All top 10 things customers can do on a page rated highly in importance, with all but two getting an average rating above 4.4 on a 5 point scale. The kinds of layout changes our composers allow customers to make align well with customers’ needs. The most common were adding columns to a table (94%) and resizing regions and drag and drop content (both selected by 88% of participants). We want to thank the attendees of the session for allowing us another great opportunity to gather valuable feedback from our customers! If you didn’t have a chance to attend the session, we will provide a link to the OOW presentation when it becomes available.

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• Efficient way of drawing outlines around sprites

  - by Greg

  Hi, I'm using XNA to program a game, and have been experimenting with various ways to achieve a 'selected' effect on my sprites. The trouble I am having is that each clickable that is drawn in the spritebatch is drawn using more than a single sprite (each object can be made up of up to 6 sprites). I'd appreciate it if someone could advise me on how I could achieve adding an outline to my sprites of X pixels (so the outline width can be various numbers of whole pixels). Thanks in advance, Greg.

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• A deque based on binary trees

  - by Greg Ros

  This is a simple immutable deque based on binary trees. What do you think about it? Does this kind of data structure, or possibly an improvement thereof, seem useful? How could I improve it, preferably without getting rid of its strengths? (Not in the sense of more operations, in the sense of different design) Does this sort of thing have a name? Red nodes are newly instantiated; blue ones are reused. Nodes aren't actually red or anything, it's just for emphasis.

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• Internal Mutation of Persistent Data Structures

  - by Greg Ros

  To clarify, when I mean use the terms persistent and immutable on a data structure, I mean that: The state of the data structure remains unchanged for its lifetime. It always holds the same data, and the same operations always produce the same results. The data structure allows Add, Remove, and similar methods that return new objects of its kind, modified as instructed, that may or may not share some of the data of the original object. However, while a data structure may seem to the user as persistent, it may do other things under the hood. To be sure, all data structures are, internally, at least somewhere, based on mutable storage. If I were to base a persistent vector on an array, and copy it whenever Add is invoked, it would still be persistent, as long as I modify only locally created arrays. However, sometimes, you can greatly increase performance by mutating a data structure under the hood. In more, say, insidious, dangerous, and destructive ways. Ways that might leave the abstraction untouched, not letting the user know anything has changed about the data structure, but being critical in the implementation level. For example, let's say that we have a class called ArrayVector implemented using an array. Whenever you invoke Add, you get a ArrayVector build on top of a newly allocated array that has an additional item. A sequence of such updates will involve n array copies and allocations. Here is an illustration: However, let's say we implement a lazy mechanism that stores all sorts of updates -- such as Add, Set, and others in a queue. In this case, each update requires constant time (adding an item to a queue), and no array allocation is involved. When a user tries to get an item in the array, all the queued modifications are applied under the hood, requiring a single array allocation and copy (since we know exactly what data the final array will hold, and how big it will be). Future get operations will be performed on an empty cache, so they will take a single operation. But in order to implement this, we need to 'switch' or mutate the internal array to the new one, and empty the cache -- a very dangerous action. However, considering that in many circumstances (most updates are going to occur in sequence, after all), this can save a lot of time and memory, it might be worth it -- you will need to ensure exclusive access to the internal state, of course. This isn't a question about the efficacy of such a data structure. It's a more general question. Is it ever acceptable to mutate the internal state of a supposedly persistent or immutable object in destructive and dangerous ways? Does performance justify it? Would you still be able to call it immutable? Oh, and could you implement this sort of laziness without mutating the data structure in the specified fashion?

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• Library Organization in .NET

  - by Greg Ros

  I've written a .NET bitwise operations library as part of my projects (stuff ranging from get MSB set to some more complicated bitwise transformations) and I mean to release it as free software. I'm a bit confused about a design aspect of the library, though. Many of the methods/transformations in the library come with different endianness. A simple example is a getBitAt method that regards index 0 as the least significant bit, or the most significant bit, depending on the version used. In practice, I've found that using separate functions for different endianness results in much more comprehensible and reusable code than assuming all operations are little-endian or something. I'm really stumped regarding how best to package the library. Should I have methods that have LE and BE versions take an enum parameter in their signature, e.g. Endianness.Little, Endianness.Big? Should I have different static classes with identically named methods? such as MSB.GetBit and LSB.GetBit On a much wider note, is there a standard I could use in cases like this? Some guide? Is my design issue trivial? I have a perfectionist bent, and I sometimes get stuck on tricky design issues like this... Note: I've sort of realized I'm using endianness somewhat colloquially to refer to the order/place value of digital component parts (be they bits, bytes, or words) in a larger whole, in any setting. I'm not talking about machine-level endianness or serial transmission endianness. Just about place-value semantics in general. So there isn't a context of targeting different machines/transmission techniques or something.

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• Performance tuning of tabular data models in Analysis Services

  - by Greg Low

  More and more practical information around working with tabular data models is starting to appear as more and more sites get deployed.At SQL Down Under, we've already helped quite a few customers move to tabular data models in Analysis Services and have started to collect quite a bit of information on what works well (and what doesn't) in terms of performance of these models. We've also been running a lot of training on tabular data models.It was great to see a whitepaper on the performance of these models released today.Performance Tuning of Tabular Models in SQL Server 2012 Analysis Services was written by John Sirmon, Greg Galloway, Cindy Gross and Karan Gulati. You'll find it here: http://msdn.microsoft.com/en-us/library/dn393915.aspx

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• Présentation de Robot Operating System, par Jérôme Laplace

  Salut, je signale un nouvel article pour les programmeurs-roboticiens. Il s'agit d'un article d'introduction à ROS (Robot Operating System). ROS est le standard qui monte dans le monde de la robotique. Il est gratuit, open-source et robuste. Pour ceux qui souhaitent découvrir ou aller plus loin dans la robotique et après en intelligence artificielle, je pense que ça peut être une introduction utile. Cet article ne comporte pas de code, il présente les concepts. A lire donc avec de faire les tutoriaux... Présentation de Robot Operat...

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• Oracle VM Deep Dives

  - by rickramsey

  "With IT staff now tasked to deliver on-demand services, datacenter virtualization requirements have gone beyond simple consolidation and cost reduction. Simply provisioning and delivering an operating environment falls short. IT organizations must rapidly deliver services, such as infrastructure-as-a-service (IaaS), platform-as-a-service (PaaS), and software-as-a-service (SaaS). Virtualization solutions need to be application-driven and enable:" "Easier deployment and management of business critical applications" "Rapid and automated provisioning of the entire application stack inside the virtual machine" "Integrated management of the complete stack including the VM and the applications running inside the VM." Application Driven Virtualization, an Oracle white paper That was published in August of 2011. The new release of Oracle VM Server delivers significant virtual networking performance improvements, among other things. If you're not sure how virtual networks work or how to use them, these two articles by Greg King and friends might help. Looking Under the Hood at Virtual Networking by Greg King Oracle VM Server for x86 lets you create logical networks out of physical Ethernet ports, bonded ports, VLAN segments, virtual MAC addresses (VNICs), and network channels. You can then assign channels (or "roles") to each logical network so that it handles the type of traffic you want it to. Greg King explains how you go about doing this, and how Oracle VM Server for x86 implements the network infrastructure you configured. He also describes how the VM interacts with paravirtualized guest operating systems, hardware virtualized operating systems, and VLANs. Finally, he provides an example that shows you how it all looks from the VM Manager view, the logical view, and the command line view of Oracle VM Server for x86. Fundamental Concepts of VLAN Networks by Greg King and Don Smerker Oracle VM Server for x86 supports a wide range of options in network design, varying in complexity from a single network to configurations that include network bonds, VLANS, bridges, and multiple networks connecting the Oracle VM servers and guests. You can create separate networks to isolate traffic, or you can configure a single network for multiple roles. Network design depends on many factors, including the number and type of network interfaces, reliability and performance goals, the number of Oracle VM servers and guests, and the anticipated workload. The Oracle VM Manager GUI presents four different ways to create an Oracle VM network: Bonds and ports VLANs Both bond/ports and VLANS A local network This article focuses the second option, designing a complex Oracle VM network infrastructure using only VLANs, and it steps through the concepts needed to create a robust network infrastructure for your Oracle VM servers and guests. More Resources Virtual Networking for Dummies Download Oracle VM Server for x86 Find technical resources for Oracle VM Server for x86 -Rick Follow me on: Blog | Facebook | Twitter | Personal Twitter | YouTube | The Great Peruvian Novel

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• Making Use of Plan Explorer in my own Environment

  - by Jonathan Kehayias

  Back in October 2010, I briefly blogged about the SQL Sentry Plan Explorer in my blog post wrap up for SQL Bits 7 and how impressed I was with what I saw from a Alpha demo standpoint from Greg Gonzalez ( Blog | Twitter ) while I was at SQLBits 7 in York.  To be 100% honest and transparent, Greg gave me early access to this tool after discussing it at SQLBits 7, and I had the opportunity to test a number of pre-Beta releases where I was able to offer significant feedback and submit bugs in the...(read more)

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• Making Use of Plan Explorer in my own Environment

  - by Jonathan Kehayias

  Back in October 2010, I briefly blogged about the SQL Sentry Plan Explorer in my blog post wrap up for SQL Bits 7 and how impressed I was with what I saw from a Alpha demo standpoint from Greg Gonzalez ( Blog | Twitter ) while I was at SQLBits 7 in York.  To be 100% honest and transparent, Greg gave me early access to this tool after discussing it at SQLBits 7, and I had the opportunity to test a number of pre-Beta releases where I was able to offer significant feedback and submit bugs in the...(read more)

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• #SQLMug - Like a collectors set of 5 x geeky SQL Mugs?

  - by Greg Low

  Hi Folks,For a while, I've been wanting to get some great SQL mugs printed for SQL Down Under but I need further inspiration so here's your chance to get a collectors set of 5 SQL mugs:Send me (greg @ sqldownunder . com) a great line to go onto the mugs, along with your country and a delivery address. I'll pick the best 5 and get mugs printed with those sayings. If you're one of the 5, I'll send you a collectors set with one of each of the 5. Simple enough?Here are some ideas I've already received to get you started:Chuck Norris gets NULL. Nothing compares to him either.ALTER MUG  SET SINGLE_USER  WITH ROLLBACK IMMEDIATE;DENY CONTROL  ON OBJECT::MUG  TO public;knock knock who's there? sp_ sp_who? spid 1, spid 2, spid 3, spid 4... ALTER DATABASE CriticalDB SET ChuckNorrisMode = ON WITH NOWAIT;I'll probably cut off new entries around the end of April.

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• XEROX Phaser 3160N installation on UBUNTU 12.04 LTE machine

  - by Greg Verrall

  I have recently had windows XP die on one of my machines, and have installed Linux UBUNTU. The OS works great, except for installing the Xerox Phaser 3160N printer. The OS can find and install the network printer, but when I print a test page, it tells me “Internal Error – Please use the correct driver”. I have the correct drivers, as your support team have sent me the link, (http://www.support.xerox.com/support/phaser-3160/file-download/enau.html?operatingSystem=linux&fileLanguage=en_GB&contentId=105724&from=downloads&viewArchived=false) but I cannot install these drivers to run the printer. These are the instructions from the online guide for installing on a Linux machine: 1. Make sure that the machine is connected to your network and powered on. Also, your machine’s IP address should have been set. 2. Insert the supplied software CD into your CD-ROM drive. 3. Double-click CD-ROM icon that appears on your Linux desktop. 4. Double-click the Linux folder. 5. Double-click the install.sh icon. 6. The Xerox Installer window opens. Click Continue. 7. The Add printer wizard window opens. Click Next. 8. Select Network printer and click Search button. 9. The Printer’s IP address and model name appears on list field. 10. Select your machine and click Next. I get as far as step 5, and step 6 never happens, if it did, it would be very easy from there. There are options to add additional software to UBUNTU, however it does not recognise the installation CD as valid when I try to add it as a source. Any ideas on who can help me? regards, Greg Verrall

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• Can I set up multiple accounts on DD-WRT? [closed]

  - by Greg Ros

  Possible Duplicate: Can I set up multiple accounts on DD-WRT? I want to set up multiple accounts on DD-WRT (accounts meaning, username-password pairs). Specifically, I want one to be used primarily for remote web management (though there is no reason to restrict the account to such). Is this possible? If so, how do I go about it? I'm running: Router Model TP-Link TL-WR1043ND Firmware Version DD-WRT v24-sp2 (08/07/10) std - build 14896

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