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  • Keyboard locking up in Visual Studio 2010, Part 2

    - by Jim Wang
    Last week I posted about looking into the keyboard locking up issue in Visual Studio.  So far it looks like not a lot of people have replied to provide concrete repro steps, which confirms my suspicion that this is somewhat of a random issue. So at this point, I have a couple of choices.  I can either wait for somebody in the community to provide a repro of the problem that I can reliably run into, or I can do the work myself. I’m going to do both, so while I’m waiting for more possible bug reports, I’m going to write a tool that models the behavior of a typical Visual Studio user and use that to hopefully isolate the problem. I’ve chosen to go with this path since given the information in the bug reports, it seems people hit the issue with many different configurations in many different scenarios.  This means that me sitting down without any solid repro steps is likely not going to be a good use of time.  Instead, I’m going to go with a model-based testing approach where I will define a series of actions that a user in VS can do, and then proceed to run my model.  I’ll let you guys know how this works out for isolating bugs :) I’m using an internal tool for the model engine and AutoIt for the UI automation (I want something lightweight for a one-off).  One of the challenges will be getting feedback: AutoIt is great at driving, but not so great at understanding what success and failure means.

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  • Does the "security" repository provides anything not found in the "updates" repository?

    - by netvope
    For the limited number of package I looked at (e.g. apache), I found that the package version in the updates repository is always newer than or equal to the version available in the security repository (provided that they exist). This gives me the impression that all security patches posted to the security repository are also posted to the updates repository. If this is true, I can remove all <release_name>-security entries in my apt sources.list and the <release_name>-updates entries will still give me the security patches. This will speed up apt-get update quite a bit. The best documentation I can found regarding the repositories is on the community help page "Important Security Updates (raring-security)". Patches for security vulnerabilities in Ubuntu packages. They are managed by the Ubuntu Security Team and are designed to change the behavior of the package as little as possible -- in fact, the minimum required to resolve the security problem. As a result, they tend to be very low-risk to apply and all users are urged to apply security updates. "Recommended Updates (raring-updates)". Updates for serious bugs in Ubuntu packaging that do not affect the security of the system. However, it does not mention whether the updates repository also includes everything in the security repository. Can anyone confirm (or disconfirm) this?

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  • Dual boot Ubuntu and Windows 7, I Can only boot ubuntu through recovery mode

    - by Alec
    I want to become a new user of Ubuntu, however this problem is preventing me. I have/had Window 7 professional on my computer. I recently looked into getting linux. I discovered dual-booting and decided to give it a try. First I created a bootable flash drive with ubuntu 12.10 64 bit. I then followed the instructions on: https://help.ubuntu.com/community/WindowsDualBoot after I finished going through the setup, my computer rebooted. After the reboot I was able to select Ubuntu, advanced options for Ubuntu, 2 memory tests, and windows 7 (loader). So I chose Windows ( honestly i was more concerned that i still had everything on windows at this point). I then rebooted again and selected Ubuntu. When i selected Ubuntu, the background screen of Grub (the crimson/burgandy color) stayed for a few seconds then the screen went black: video here http://www.youtube.com/watch?v=6kKcG4sT7Lg&feature=plcp I tried again with the same results. so i redid the ubuntu install differently using http://www.liberiangeek.net/2012/10/dual-booting-windows-7-and-ubuntu-12-10-quantal-quetzal/. After rebooting the same thing happened. After that i was stumped, so i figured it could hurt to experiment. after all i backed up my windows 7 stuff, and i have the software disk. I tried booting in recovery mode under "advanced options for Ubuntu" and sure enough, after selecting continue to normal reboot it worked. So i updated and everything but when i rebooted it still wouldn't boot under Ubuntu. It would always boot after recovery mode. So i try installing 12.10 32 bit Ubuntu. the same problem keeps happening. I can still get to Ubuntu through recovery mode. so i went online and tried using the terminal (in ubuntu that i booted through recovery mode) when i was using it i discovered that "Error in sitecustomize; set PYTHONVERBOSE for traceback: EOFError: EOF read where not expected" kept showing up. also i noticed a notification in the top right corner that looked like a do not enter sign. it said "an error occured, please run package manager from the right-click menu or apt-get in a terminal to see what is wrong. the error message was: 'ror in sitecustomize;set PYTHONVERBOSE for traceback: EOFError: EOF read where not expected traceback (most recent called last): File "/usr/bin/lsb_release EOFError: EOF read where not expected 39;0' this usually means that your installed packages have unmet dependencies" Naturally i assumed this was what was causing my boot problems. I downloaded synaptic and updated everything and the error went away. but my boot problem was still a problem. so i go online find some things that have worked for others, like this Try to do this (in your terminal: sudo nano /etc/default/grub Look for: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" Change it too : GRUB_CMDLINE_LINUX_DEFAULT="quiet" And update Grub: sudo update-grub This should fix stuff.) I did this and i still have the problem. sorry for the excessive explanation, please help.

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  • BlueTooth not working on my HP Probook 4720s

    - by mtrento
    the blue tooth on my ubuntu 11.10 does not work. When i try to ad a device it scans indefinitely and never find anything. Wireless is working perfeclty and with windows 7 it is detected. As i read somewhere , the bluetooth is not listed in the usb devices. Is it supported under ubuntu? here are the output of the various debug command i tested : hciconfig -a hci0: Type: BR/EDR Bus: USB BD Address: E0:2A:82:7A:8B:04 ACL MTU: 310:10 SCO MTU: 64:8 UP RUNNING PSCAN ISCAN RX bytes:1895 acl:0 sco:0 events:70 errors:0 TX bytes:1986 acl:0 sco:0 commands:64 errors:0 Features: 0xff 0xff 0x8f 0xfe 0x9b 0xff 0x59 0x83 Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3 Link policy: RSWITCH HOLD SNIFF PARK Link mode: SLAVE ACCEPT Name: 'PC543host-0' Class: 0x5a0100 Service Classes: Networking, Capturing, Object Transfer, Telephony Device Class: Computer, Uncategorized HCI Version: 2.1 (0x4) Revision: 0x149c LMP Version: 2.1 (0x4) Subversion: 0x149c Manufacturer: Cambridge Silicon Radio (10) hcitool scan hcitool scan Scanning ... lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub Bus 001 Device 003: ID 04f2:b1ac Chicony Electronics Co., Ltd Bus 002 Device 003: ID 413c:3010 Dell Computer Corp. Optical Wheel Mouse Bus 002 Device 004: ID 148f:1000 Ralink Technology, Corp. lsmod | grep -i bluetooth bluetooth 166112 23 bnep,rfcomm,btusb dmesg | grep -i bluetooth [ 18.543947] Bluetooth: Core ver 2.16 [ 18.544017] Bluetooth: HCI device and connection manager initialized [ 18.544020] Bluetooth: HCI socket layer initialized [ 18.544021] Bluetooth: L2CAP socket layer initialized [ 18.545469] Bluetooth: SCO socket layer initialized [ 18.548890] Bluetooth: Generic Bluetooth USB driver ver 0.6 [ 30.204776] Bluetooth: RFCOMM TTY layer initialized [ 30.204782] Bluetooth: RFCOMM socket layer initialized [ 30.204784] Bluetooth: RFCOMM ver 1.11 [ 30.247291] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [ 30.247295] Bluetooth: BNEP filters: protocol multicast lspci 00:00.0 Host bridge: Intel Corporation Core Processor DRAM Controller (rev 02) 00:01.0 PCI bridge: Intel Corporation Core Processor PCI Express x16 Root Port (rev 02) 00:16.0 Communication controller: Intel Corporation 5 Series/3400 Series Chipset HECI Controller (rev 06) 00:1a.0 USB Controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05) 00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio (rev 05) 00:1c.0 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 1 (rev 05) 00:1c.1 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 2 (rev 05) 00:1c.3 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 4 (rev 05) 00:1c.5 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 6 (rev 05) 00:1d.0 USB Controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05) 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev a5) 00:1f.0 ISA bridge: Intel Corporation Mobile 5 Series Chipset LPC Interface Controller (rev 05) 00:1f.2 SATA controller: Intel Corporation 5 Series/3400 Series Chipset 6 port SATA AHCI Controller (rev 05) 00:1f.6 Signal processing controller: Intel Corporation 5 Series/3400 Series Chipset Thermal Subsystem (rev 05) 01:00.0 VGA compatible controller: ATI Technologies Inc Manhattan [Mobility Radeon HD 5400 Series] 01:00.1 Audio device: ATI Technologies Inc Manhattan HDMI Audio [Mobility Radeon HD 5000 Series] 44:00.0 Network controller: Ralink corp. RT3090 Wireless 802.11n 1T/1R PCIe 45:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 03) ff:00.0 Host bridge: Intel Corporation Core Processor QuickPath Architecture Generic Non-core Registers (rev 02) ff:00.1 Host bridge: Intel Corporation Core Processor QuickPath Architecture System Address Decoder (rev 02) ff:02.0 Host bridge: Intel Corporation Core Processor QPI Link 0 (rev 02) ff:02.1 Host bridge: Intel Corporation Core Processor QPI Physical 0 (rev 02) ff:02.2 Host bridge: Intel Corporation Core Processor Reserved (rev 02) ff:02.3 Host bridge: Intel Corporation Core Processor Reserved (rev 02) rfkill list 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no 1: hci0: Bluetooth Soft blocked: no Hard blocked: no 2: hp-wifi: Wireless LAN Soft blocked: no Hard blocked: no 3: hp-bluetooth: Bluetooth Soft blocked: no Hard blocked: no

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  • Apache VERY high page load time

    - by Aaron Waller
    My Drupal 6 site has been running smoothly for years but recently has experienced intermittent periods of extreme slowness (10-60 sec page loads). Several hours of slowness followed by hours of normal (4-6 sec) page loads. The page always loads with no error, just sometimes takes forever. My setup: Windows Server 2003 Apache/2.2.15 (Win32) Jrun/4.0 PHP 5 MySql 5.1 Drupal 6 Cold fusion 9 Vmware virtual environment DMZ behind a corporate firewall Traffic: 1-3 hits/sec avg Troubleshooting No applicable errors in apache error log No errors in drupal event log Drupal devel module shows 242 queries in 366.23 milliseconds,page execution time 2069.62 ms. (So it looks like queries and php scripts are not the problem) NO unusually high CPU, memory, or disk IO Cold fusion apps, and other static pages outside of drupal also load slow webpagetest.org test shows very high time-to-first-byte The problem seems to be with Apache responding to requests, but previously I've only seen this behavior under 100% cpu load. Judging solely by resource monitoring, it looks as though very little is going on. Here is the kicker - roughly half of the site's access comes from our LAN, but if I disable the firewall rule and block access from outside of our network, internal (LAN) access (1000+ devices) is speedy. But as soon as outside access is restored the site is crippled. Apache config? Crawlers/bots? Attackers? I'm at the end of my rope, where should I be looking to determine where the problem lies?

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  • Silverlight Cream for April 21, 2010 -- #843

    - by Dave Campbell
    In this Issue: Alan Beasley, Roboblob, SilverLaw, Mike Snow, and Chris Koenig. Shoutouts: Ozymandias has a discussion up: The Three Pillars of Xbox Live on Windows Phone John Papa announced that Silverlight 4 is now on WebPI: Get Silverlight 4 – Simplified! Dan Wahlin posted the code and material from DevConnections: Code from my DevConnections Talks and Workshop Tim Heuer has a good deal posted from GoDaddy: Get a Silverlight XAP signing certificate for cheap thanks to GoDaddy From SilverlightCream.com: ListBox Styling (Part2-ControlTemplate) in Expression Blend & Silverlight Alan Beasley is back with part 2 of his ListBox styling tutorial adventure in Expression Blend... this looks like some of the stuff I was getting close to in Win32 a bunch of years back... great stuff... thanks Alan! Unit Testing Modal Dialogs in MVVM and Silverlight 4 Roboblob responds to some feedback with an expansion on his previous post with the addition of some Unit Testing. ChildWindowResizeBehavior - Silverlight 4 Blend 4 RC design time support SilverLaw has a short post about a behavior he has available at the Expression Gallery that resizes a child window with the Mouse Wheel, and also has Design-time support in Blend. Tip of the Day #111 – How to Configure your Silverlight App to run in Elevated Trust Mode Mike Snow has his latest tip up, and this one is on both ends of of the Elevated Trust Mode of OOB ... how to set it, and what your user experience is like. WP7 Part 2 – Working with Data Chris Koenig has part 2 of his WP7 exploration up ... he's tackling Nerd Dinner and pulling down Odata. Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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  • Is this simple XOR encrypted communication absolutely secure?

    - by user3123061
    Say Alice have 4GB USB flash memory and Peter also have 4GB USB flash memory. They once meet and save on both of memories two files named alice_to_peter.key (2GB) and peter_to_alice.key (2GB) which is randomly generated bits. Then they never meet again and communicate electronicaly. Alice also maintains variable called alice_pointer and Peter maintains variable called peter_pointer which is both initially set to zero. Then when Alice needs to send message to Peter they do: encrypted_message_to_peter[n] = message_to_peter[n] XOR alice_to_peter.key[alice_pointer + n] Where n i n-th byte of message. Then alice_pointer is attached at begining of the encrypted message and (alice_pointer + encrypted message) is sent to Peter and then alice_pointer is incremented by length of message (and for maximum security can be used part of key erased) Peter receives encrypted_message, reads alice_pointer stored at beginning of message and do this: message_to_peter[n] = encrypted_message_to_peter[n] XOR alice_to_peter.key[alice_pointer + n] And for maximum security after reading of message also erases used part of key. - EDIT: In fact this step with this simple algorithm (without integrity check and authentication) decreases security, see Paulo Ebermann post below. When Peter needs to send message to Alice they do analogical steps with peter_to_alice.key and with peter_pointer. With this trivial schema they can send for next 50 years each day 2GB / (50 * 365) = cca 115kB of encrypted data in both directions. If they need more data to send, they simple use larger memory for keys for example with today 2TB harddiscs (1TB keys) is possible to exchange next 50years 60MB/day ! (thats practicaly lots of data for example with using compression its more than hour of high quality voice communication) It Seems to me there is no way for attacker to read encrypted message without keys even if they have infinitely fast computer. because even with infinitely fast computer with brute force they get ever possible message that can fit to length of message, but this is astronomical amount of messages and attacker dont know which of them is actual message. I am right? Is this communication schema really absolutely secure? And if its secure, has this communication method its own name? (I mean XOR encryption is well-known, but whats name of this concrete practical application with use large memories at both communication sides for keys? I am humbly expecting that this application has been invented someone before me :-) ) Note: If its absolutely secure then its amazing because with today low cost large memories it is practicaly much cheeper way of secure communication than expensive quantum cryptography and with equivalent security! EDIT: I think it will be more and more practical in future with lower a lower cost of memories. It can solve secure communication forever. Today you have no certainty if someone succesfuly atack to existing ciphers one year later and make its often expensive implementations unsecure. In many cases before comunication exist step where communicating sides meets personaly, thats time to generate large keys. I think its perfect for military communication for example for communication with submarines which can have installed harddrive with large keys and military central can have harddrive for each submarine they have. It can be also practical in everyday life for example for control your bank account because when you create your account you meet with bank etc.

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  • Polygons vs sprites rendering performance in Unity for windows phone 8

    - by Géry Arduino
    I'm currently building a windows phone 8 game with unity, having 111 (no more no less) sprites being updated each frames. I have a strong overhead in the profiler (70% to 90% minimum) I tried the following to get higher frame rate, I'm running it with minimum quality settings, I tried disabling and enabling V-Sync Finally I managedto get 60Fps, but I still have large overhead. I believe I should have more than 60Fps for such few amount. Moreover, I still have to implement the game logic over this so I'd like some room in my FPS to be able to work. I was wondering if it would be better in terms of performance to use polygons instead of sprites? As sprites are quite new in Unity, (that would give me around 222 triangles). Did someone tried to check the performance differences between sprites and actual mesh renderes in Unity when it comes to phones? If so what could be the best option in that case? FYI : I'm using the Windows Phone 8 emulator on Visual studio, I have a compliant computer for that so it should normally reflect the behavior of a real phone (expecting some differences but still...) EDIT : To clarify my question i wonder what is the most efficient in windows phone 8 : Sprites or Mesh renderers?

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  • ArchBeat Link-o-Rama for 2012-03-27

    - by Bob Rhubart
    Deploying OAM "correctly" | Chris Johnson fusionsecurity.blogspot.com Chris Johnson's concise blog post will help you to deploy Oracle Access Manager "for real." Oracle BPM: Suspend and alter process | Martijn van der Kamp www.nl.capgemini.com "There’s one tricky part with intervening in the run time behavior of a process, and that is compliance," says Martijn van der Kamp. "Make sure your solution covers the compliance regulations by the regulatory department, including the option of intervening in the process." Red Samurai Tool Announcement - MDS Cleaner V2.0 | Andrejus Baranovskis andrejusb.blogspot.com Oracle ACE Director Andrejus Baranovskis shares news about an upcoming free product for MDS administrators. Oracle bulk insert or select from Java with Eclipselink | Edwin Biemond biemond.blogspot.com Oracle ACE Edwin Biemond shows you how to retrieve all the departments from the HR demo schema, add a new department, and do a multi insert. WebLogic Server Weekly for March 26th, 2012 | Steve Button blogs.oracle.com Steve Button share information on: WLS 1211 Update, Java 7 Certification, Galleria, WebLogic for DBAs, REST and Enterprise Architecture, Singleton Services. Northeast Ohio Oracle Users Group 2 Day Seminar - May 14-15 - Cleveland, OH www.neooug.org May 14-15 - Cleveland, OH.More than 20 sessions over 4 tracks, featuring 18 speakers, including Oracle ACE Director Cary Millsap, Oracle ACE Director Rich Niemiec, and Oracle ACE Stewart Brand. Register before April 15 and save. Thought for the Day "With good program architecture debugging is a breeze, because bugs will be where they should be." — David May

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  • InfiniBand Enabled Diskless PXE Boot

    - by Neeraj Gupta
    When you want to bring up a compute server in your environment and need InfiniBand connectivity, usually you go through various installation steps. This could involve operating systems like Linux, followed by a compatible InfiniBand software distribution, associated dependencies and configurations. What if you just want to run some InfiniBand diagnostics or troubleshooting tools from a test machine ? What if something happened to your primary machine and while recovering in rescue mode, you also need access to your InfiniBand network ? Often times we use opensource community supported small Linux distributions but they don't come with required InfiniBand support and tools. In this weblog, I am going to provide instructions on how to add InfniBand support to a specific Linux image - Parted Magic.This is a free to use opensource Linux distro often used to recover or rescue machines. The distribution itself will not be changed at all. Yes, you heard it right ! I have built an InfiniBand Add-on package that will be passed to the default kernel and initrd to get this all working. Pr-requisites You will need to have have a PXE server ready on your ethernet based network. The compute server you are trying to PXE boot should have a compatible IB HCA and must be connected to an active IB network. Required Downloads Download the Parted Magic small distribution for PXE from Parted Magic website. Download InfiniBand PXE Add On package. Right Click and Download from here. Do not extract contents of this file. You need to use it as is. Prepare PXE Server Extract the contents of downloaded pmagic distribution into a temporary directory. Inside the directory structure, you will see pmagic directory containing two files - bzImage and initrd.img. Copy this directory in your TFTP server's root directory. This is usually /tftpboot unless you have a different setup. For Example: cp pmagic_pxe_2012_2_27_x86_64.zip /tmp cd /tmp unzip pmagic_pxe_2012_2_27_x86_64.zip cd pmagic_pxe_2012_2_27_x86_64 # ls -l total 12 drwxr-xr-x  3 root root 4096 Feb 27 15:48 boot drwxr-xr-x  2 root root 4096 Mar 17 22:19 pmagic cp -r pmagic /tftpboot As I mentioned earlier, we dont change anything to the default pmagic distro. Simply provide the add-on package via PXE append options. If you are using a menu based PXE server, then add an entry to your menu. For example /tftpboot/pxelinux.cfg/default can be appended with following section. LABEL Diskless Boot With InfiniBand Support MENU LABEL Diskless Boot With InfiniBand Support KERNEL pmagic/bzImage APPEND initrd=pmagic/initrd.img,pmagic/ib-pxe-addon.cgz edd=off load_ramdisk=1 prompt_ramdisk=0 rw vga=normal loglevel=9 max_loop=256 TEXT HELP * A Linux Image which can be used to PXE Boot w/ IB tools ENDTEXT Note: Keep the line starting with "APPEND" as a single line. If you use host specific files in pxelinux.cfg, then you can use that specific file to add the above mentioned entry. Boot Computer over PXE Now boot your desired compute machine over PXE. This does not have to be over InfiniBand. Just use your standard ethernet interface and network. If using menus, then pick the new entry that you created in previous section. Enable IPoIB After a few minutes, you will be booted into Parted Magic environment. Open a terminal session and see if InfiniBand is enabled. You can use commands like: ifconfig -a ibstat ibv_devices ibv_devinfo If you are connected to InfiniBand network with an active Subnet Manager, then your IB interfaces must have come online by now. You can proceed and assign IP address to them. This will enable you at IPoIB layer. Example InfiniBand Diagnostic Tools I have added several InfiniBand Diagnistic tools in this add-on. You can use from following list: ibstat, ibstatus, ibv_devinfo, ibv_devices perfquery, smpquery ibnetdiscover, iblinkinfo.pl ibhosts, ibswitches, ibnodes Wrap Up This concludes this weblog. Here we saw how to bring up a computer with IPoIB and InfiniBand diagnostic tools without installing anything on it. Its almost like running diskless !

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  • Thinktecture.IdentityServer Beta 1

    - by Your DisplayName here!
    I just upload beta 1 to codeplex. Please test this version and give me feedback. Some quick notes on setup Watch the intro screencast on the codeplex site. Use the setup tool to set the signing and SSL certificate. You can now also set the ACLs on the private key for your worker pool account. IIS is required . SSL for the IIS site the STS runs in is required. Users of the STS must be in the 'IdentityServerUsers' role. Admins of the STS must be in the 'IdentityServerAdministrators' roles. What’s new? Mainly smaller bits and pieces and some refactoring. The biggest under the cover change is a new authorization model for the STS itself. If, e.g. you don’t like the new roles I introduced, you can easily change the behavior in the claims authorization manager in the STS web site project. What’s missing? The big one is Azure support. Not that I ran into unforeseeable problems here, I just wanted to wait until the on-premise version is more stabilized. Now with B1 I can start adding Azure support back.

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  • SOLID Thoughts

    - by GeekAgilistMercenary
    SOLID came up again in discussion.  What is SOLID?  Well, glad you asked, because I am going to elaborate on the SOLID Principles a bit. Initial Concept S Single Responsibility Principle O Open/Closed Principle L Liskov Substitution Principle I Interface Segregation Principle D Dependency Inversion/Injection Principle The Single Responsibility Principle (SRP) is stated that every object should have a single responsibility and should be entirely encapsulated by the class.  This helps keep cohesion.  Here is a short example, starting with a basic class. public class Car { decimal Gas; int Doors; int Speed; decimal RampJumpSpeed; } Now I will refactor a little bit to make it a bit more SRP friendly. public class Car { decimal Gas; int Speed; }   public class DuneBuggy : Car { decimal RampJumpSpeed; }   public class EconomyCar : Car { int Doors; } What we end up with, instead of one class, is an abstract class and two classes that have their respective methods or properties to keep the responsibilities were they need to be. The Open Closed Principle (OCP) is one of my favorites, which states simply, that you should be able to extend a classes behavior without modifying it.  There are a couple of ways one can extend a class, by inheritance, composition, or by proxy implementation.  The Liskov Substitution Principle (LSP) states that a derived class must be substitutable for their base classes. The Dependency Inversion Principle (DIP) states that one should depend on abstractions and not on concrete implementations. Finally, the Interface Segregation Principle (ISP) states that fine grain interfaces should be client specific. So hope that helps with kicking off a basic understanding of SOLID Principles.  I will be following this entry up with some new bits in the near future related to good software design and practice. Original post.

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  • Synaptic won't launch from menu in panel in fresh Lubuntu minimal desktop 12.04 install

    - by ven42
    I performed a fresh install of Lubuntu 12.04 with minimal desktop, as described here: https://help.ubuntu.com/community/Lubuntu/Documentation/MinimalInstall. To clarify, I did a command-line install from the Lubuntu alternative install disc, then I did an "apt-get install --no-install-recommends lubuntu-desktop". Everything is working fine, except that Synaptic will not run from the menu entry in the panel. I am not prompted for a password, and no window of any sort appears after clicking the menu entry. I installed lxshortcut to see what the shortcut was running, and the command is "synaptic-pkexec". If I type this command into the "Run" menu, I get the same behavior (or lack thereof). I can get Synaptic to open up just fine by typing "gksudo synaptic" at the "Run" menu. Also, if I run "synaptic-pkexec" from the terminal, then I am prompted for my password within the terminal, and after that Synaptic opens normally. Can someone please suggest the right way to get Synaptic working? I could just change the menu entry to "gksudo synaptic", but I'm guessing that it's set to "synaptic-pkexec" for a reason. I have a vague understanding that this pkexec business has something to do with PolicyKit, but I don't really know what PolicyKit is or how to tell if something is broken with it. Thanks.

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  • TDWI World Conference Features Oracle and Big Data

    - by Mandy Ho
    Oracle is a Gold Sponsor at this year's TDWI World Conference Series, held at the Manchester Grand Hyatt in San Diego, California - July 31 to Aug 1. The theme of this event is Big Data Tipping Point: BI Strategies in the Era of Big Data. The conference features an educational look at how data is now being generated so quickly that organizations across all industries need new technologies to stay ahead - to understand customer behavior, detect fraud, improve processes and accelerate performance. Attendees will hear how the internet, social media and streaming data are fundamentally changing business intelligence and data warehousing. Big data is reaching critical mass - the tipping point. Oracle will be conducting the following Evening Workshop. To reserve your space, call 1.800.820.5592 ext 10775. Title...:    Integrating Big Data into Your Data Center (or A Big Data Reference Architecture) Date.:    Wed., August 1, 2012, at 7:00 p.m Venue:: Manchester Grand Hyatt, San Diego, Room Weblogs, Social Media, smart meters, senors and other devices generate high volumes of low density information that isn't readily accessible in enterprise data warehouses and business intelligence applications today. But, this data can have relevant business value, especially when analyzed alongside traditional information sources. In this session, we will outline a reference architecture for big data that will help you maximize the value of your big data implementation. You will learn: The key technologies in a big architecture, and their specific use case The integration point of the various technologies and how they fit into your existing IT environment How effectively leverage analytical sandboxes for data discovery and agile development of data driven solutions   At the end of this session you will understand the reference architecture and have the tools to implement this architecture at your company. Presenter: Jean-Pierre Dijcks, Senior Principal Product Manager Don't miss our booth and the chance to meet with our Big data experts on the exhibition floor at booth #306. 

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  • Right-Time Retail Part 3

    - by David Dorf
    This is part three of the three-part series.  Read Part 1 and Part 2 first. Normal 0 false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} Right-Time Marketing Real-time isn’t just about executing faster; it extends to interactions with customers as well. As an industry, we’ve spent many years analyzing all the data that’s been collected. Yes, that data has been invaluable in helping us make better decisions like where to open new stores, how to assort those stores, and how to price our products. But the recent advances in technology are now making it possible to analyze and deliver that data very quickly… fast enough to impact a potential sale in near real-time. Let me give you two examples. Salesmen in car dealerships get pretty good at sizing people up. When a potential customer walks in the door, it doesn’t take long for the salesman to figure out the revenue at stake. Is this person a real buyer, or just looking for a fun test drive? Will this person buy today or three months from now? Will this person opt for the expensive packages, or go bare bones? While the salesman certainly asks some leading questions, much of information is discerned through body language. But body language doesn’t translate very well over the web. Eloqua, which was acquired by Oracle earlier this year, reads internet body language. By tracking the behavior of the people visiting your web site, Eloqua categorizes visitors based on their propensity to buy. While Eloqua’s roots have been in B2B, we’ve been looking at leveraging the technology with ATG to target B2C. Knowing what sites were previously visited, how often the customer has been to your site recently, and how long they’ve spent searching can help understand where the customer is in their purchase journey. And knowing that bit of information may be enough to help close the deal with a real-time offer, follow-up email, or online customer service pop-up. This isn’t so different from the days gone by when the clerk behind the counter of the corner store noticed you were lingering in a particular aisle, so he walked over to help you compare two products and close the sale. You appreciated the personalized service, and he knew the value of the long-term relationship. Move that same concept into the digital world and you have Oracle’s CX Suite, a cloud-based offering of end-to-end customer experience tools, assembled primarily from acquisitions. Those tools are Oracle Marketing (Eloqua), Oracle Commerce (ATG, Endeca), Oracle Sales (Oracle CRM On Demand), Oracle Service (RightNow), Oracle Social (Collective Intellect, Vitrue, Involver), and Oracle Content (Fatwire). We are providing the glue that binds the CIO and CMO together to unleash synergies that drive the top-line higher, and by virtue of the cloud-approach, keep costs at bay. My second example of real-time marketing takes place in the store but leverages the concepts of Web marketing. In 1962 the decline of personalized service in retail began. Anyone know the significance of that year? That’s when Target, K-Mart, and Walmart each opened their first stores, and over the succeeding years the industry chose scale over personal service. No longer were you known as “Jane with the snotty kid so make sure we check her out fast,” but you suddenly became “time-starved female age 20-30 with kids.” I’m not saying that was a bad thing – it was the right thing for our industry at the time, and it enabled a huge amount of growth, cheaper prices, and more variety of products. But scale alone is no longer good enough. Today’s sophisticated consumer demands scale, experience, and personal attention. To some extent we’ve delivered that on websites via the magic of cookies, your willingness to log in, and sophisticated data analytics. What store manager wouldn’t love a report detailing all the visitors to his store, where they came from, and which products that examined? People trackers are getting more sophisticated, incorporating infrared, video analytics, and even face recognition. (Next time you walk in front on a mannequin, don’t be surprised if it’s looking back.) But the ultimate marketing conduit is the mobile phone. Since each mobile phone emits a unique number on WiFi networks, it becomes the cookie of the physical world. Assuming congress keeps privacy safeguards reasonable, we’ll have a win-win situation for both retailers and consumers. Retailers get to know more about the consumer’s purchase journey, and consumers get higher levels of service with the retailer. When I call my bank, a couple things happen before the call is connected. A reverse look-up on my phone number identifies me so my accounts can be retrieved from Siebel CRM. Then the system anticipates why I’m calling based on recent transactions. In this example, it sees that I was just charged a foreign currency fee, so it assumes that’s the reason I’m calling. It puts all the relevant information on the customer service rep’s screen as it connects the call. When I complain about the fee, the rep immediately sees I’m a great customer and I travel lots, so she suggests switching me to their traveler’s card that doesn’t have foreign transaction fees. That technology is powered by a product called Oracle Real-Time Decisions, a rules engine built to execute very quickly, basically in the time it takes the phone to ring once. So let’s combine the power of that product with our new-found mobile cookie and provide contextual customer interactions in real-time. Our first opportunity comes when a customer crosses a pre-defined geo-fence, typically a boundary around the store. Context is the key to our interaction: that’s the customer (known or anonymous), the time of day and day of week, and location. Thomas near the downtown store on a Wednesday at noon means he’s heading to lunch. If he were near the mall location on a Saturday morning, that’s a completely different context. But on his way to lunch, we’ll let Thomas know that we’ve got a new shipment of ASICS running shoes on display with a simple text message. We used the context to look-up Thomas’ past purchases and understood he was an avid runner. We used the fact that this was lunchtime to select the type of message, in this case an informational message instead of an offer. Thomas enters the store, phone in hand, and walks to the shoe department. He scans one of the new ASICS shoes using the convenient QR Codes we provided on the shelf-tags, but then he starts scanning low-end Nikes. Each scan is another opportunity to both learn from Thomas and potentially interact via another message. Since he historically buys low-end Nikes and keeps scanning them, he’s likely falling back into his old ways. Our marketing rules are currently set to move loyal customer to higher margin products. We could have set the dials to increase visit frequency, move overstocked items, increase basket size, or many other settings, but today we are trying to move Thomas to higher-margin products. We send Thomas another text message, this time it’s a personalized offer for 10% off ASICS good for 24 hours. Offering him a discount on Nikes would be throwing margin away since he buys those anyway. We are using our marketing dollars to change behavior that increases the long-term value of Thomas. He decides to buy the ASICS and scans the discount code on his phone at checkout. Checkout is yet another opportunity to interact with Thomas, so the transaction is sent back to Oracle RTD for evaluation. Since Thomas didn’t buy anything with the shoes, we’ll print a bounce-back coupon on the receipt offering 30% off ASICS socks if he returns within seven days. We have successfully started moving Thomas from low-margin to high-margin products. In both of these marketing scenarios, we are able to leverage data in near real-time to decide how best to interact with the customer and lead to an increase in the lifetime value of the customer. The key here is acting at the moment the customer shows interest using the context of the situation. We aren’t pushing random products at haphazard times. We are tailoring the marketing to be very specific to this customer, and it’s the technology that allows this to happen in near real-time. Conclusion As we enable more right-time integrations and interactions, retailers will begin to offer increased service to their customers. Localized and personalized service at scale will drive loyalty and lead to meaningful revenue growth for the retailers that execute well. Our industry needs to support Commerce Anywhere…and commerce anytime as well.

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  • Windows Azure Use Case: New Development

    - by BuckWoody
    This is one in a series of posts on when and where to use a distributed architecture design in your organization's computing needs. You can find the main post here: http://blogs.msdn.com/b/buckwoody/archive/2011/01/18/windows-azure-and-sql-azure-use-cases.aspx Description: Computing platforms evolve over time. Originally computers were directed by hardware wiring - that, the “code” was the path of the wiring that directed an electrical signal from one component to another, or in some cases a physical switch controlled the path. From there software was developed, first in a very low machine language, then when compilers were created, computer languages could more closely mimic written statements. These language statements can be compiled into the lower-level machine language still used by computers today. Microprocessors replaced logic circuits, sometimes with fewer instructions (Reduced Instruction Set Computing, RISC) and sometimes with more instructions (Complex Instruction Set Computing, CISC). The reason this history is important is that along each technology advancement, computer code has adapted. Writing software for a RISC architecture is significantly different than developing for a CISC architecture. And moving to a Distributed Architecture like Windows Azure also has specific implementation details that our code must follow. But why make a change? As I’ve described, we need to make the change to our code to follow advances in technology. There’s no point in change for its own sake, but as a new paradigm offers benefits to our users, it’s important for us to leverage those benefits where it makes sense. That’s most often done in new development projects. It’s a far simpler task to take a new project and adapt it to Windows Azure than to try and retrofit older code designed in a previous computing environment. We can still use the same coding languages (.NET, Java, C++) to write code for Windows Azure, but we need to think about the architecture of that code on a new project so that it runs in the most efficient, cost-effective way in a Distributed Architecture. As we receive new requests from the organization for new projects, a distributed architecture paradigm belongs in the decision matrix for the platform target. Implementation: When you are designing new applications for Windows Azure (or any distributed architecture) there are many important details to consider. But at the risk of over-simplification, there are three main concepts to learn and architect within the new code: Stateless Programming - Stateless program is a prime concept within distributed architectures. Rather than each server owning the complete processing cycle, the information from an operation that needs to be retained (the “state”) should be persisted to another location c(like storage) common to all machines involved in the process.  An interesting learning process for Stateless Programming (although not unique to this language type) is to learn Functional Programming. Server-Side Processing - Along with developing using a Stateless Design, the closer you can locate the code processing to the data, the less expensive and faster the code will run. When you control the network layer, this is less important, since you can send vast amounts of data between the server and client, allowing the client to perform processing. In a distributed architecture, you don’t always own the network, so it’s performance is unpredictable. Also, you may not be able to control the platform the user is on (such as a smartphone, PC or tablet), so it’s imperative to deliver only results and graphical elements where possible.  Token-Based Authentication - Also called “Claims-Based Authorization”, this code practice means instead of allowing a user to log on once and then running code in that context, a more granular level of security is used. A “token” or “claim”, often represented as a Certificate, is sent along for a series or even one request. In other words, every call to the code is authenticated against the token, rather than allowing a user free reign within the code call. While this is more work initially, it can bring a greater level of security, and it is far more resilient to disconnections. Resources: See the references of “Nondistributed Deployment” and “Distributed Deployment” at the top of this article for more information with graphics:  http://msdn.microsoft.com/en-us/library/ee658120.aspx  Stack Overflow has a good thread on functional programming: http://stackoverflow.com/questions/844536/advantages-of-stateless-programming  Another good discussion on Stack Overflow on server-side processing is here: http://stackoverflow.com/questions/3064018/client-side-or-server-side-processing Claims Based Authorization is described here: http://msdn.microsoft.com/en-us/magazine/ee335707.aspx

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  • Multithreading in Windows Phone 7 emulator: A bug

    - by Laurent Bugnion
    Multithreading is supported in Windows Phone 7 Silverlight applications, however the emulator has a bug (which I discovered and was confirmed to me by the dev lead of the emulator team): If you attempt to start a background thread in the MainPage constructor, the thread never starts. The reason is a problem with the emulator UI thread which doesn’t leave any time to the background thread to start. Thankfully there is a workaround (see code below). Also, the bug should be corrected in a future release, so it’s not a big deal, even though it is really confusing when you try to understand why the *%&^$£% thread is not &$%&%$£ starting (that was me in the plane the other day ;) This code does not work: public partial class MainPage : PhoneApplicationPage { public MainPage() { InitializeComponent(); SupportedOrientations = SupportedPageOrientation.Portrait | SupportedPageOrientation.Landscape; var counter = 0; ThreadPool.QueueUserWorkItem(o => { while (true) { Dispatcher.BeginInvoke(() => { textBlockListTitle.Text = (counter++).ToString(); }); } }); } } This code does work: public MainPage() { InitializeComponent(); SupportedOrientations = SupportedPageOrientation.Portrait | SupportedPageOrientation.Landscape; var counter = 0; ThreadPool.QueueUserWorkItem(o => { while (true) { Dispatcher.BeginInvoke(() => { textBlockListTitle.Text = (counter++).ToString(); }); // NOTICE THIS LINE!!! Thread.Sleep(0); } }); } Note that even if the thread is started in a later event (for example Click of a Button), the behavior without the Thread.Sleep(0) is not good in the emulator. As of now, i would recommend always sleeping when starting a new thread. Happy coding: Laurent   Laurent Bugnion (GalaSoft) Subscribe | Twitter | Facebook | Flickr | LinkedIn

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  • Win a Free Copy of Windows Presentation Foundation 4.5 Cookbook

    - by Ricardo Peres
    Win A free copy of the 'Windows Presentation Foundation 4.5 Cookbook', just by commenting! For the contest, Packt Publishing has two eBook copies of Windows Presentation Foundation 4.5 Cookbookto be given away to two lucky winners. How you can win: To win your copy of this book, all you need to do is come up with a comment below highlighting the reason "why you would like to win this book”. Duration of the contest & selection of winners: The contest is valid for 7 days (until November 26), and is open to everyone. Winners will be selected on the basis of their comment posted. Windows Presentation Foundation 4.5 Cookbookis written by Pavel Yosifovich, the CTO of CodeValue (http://www.codevalue.net), a software development, consulting, and training company, based in Israel. This book is written in an easy-to-read style, with a strong emphasis on real-world, practical examples. Step-by-step explanations are provided for performing important tasks. This book is the best guide for C# developer who is looking forward to increase understanding and knowledge of WPF. Using this book, readers will learn to build complex and flexible user interfaces using XAML, perform lengthy operations asynchronously while keeping the UI responsive, get well-versed with WPF features such as data binding, layout, resources, templates, and styles and also customize a control’s template to alter appearance but preserve behavior. In the next days I will post my review on this book. In the meantime, here’s the table of contents: Preface Chapter 1: Foundations Chapter 2: Resources Chapter 3: Layout and Panels Chapter 4: Using Standard Controls Chapter 5: Application and Windows Chapter 6: Data Binding Chapter 7: Commands and MVVM Chapter 8: Styles, Triggers, and Control Templates Chapter 9: Graphics and Animation Chapter 10: Custom Elements Chapter 11: Threading Index I’m waiting for your comments!

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  • chromium-browser usus 99,99% IO disk

    - by lars
    My favorite browser: chromium is testing my patience. For some reason it sometimes uses 99,99% of I/O. (reading 2-3MB/s) Other processes (updatedb.mlocate, [kswapd0], clementine, compiz) show the same behavior. However this problem always starts and ends with chromium. To illustrate the impact on my system: when my disk starts to spin like crazy en the led burns continiously the system is so slow that it takes about two to five minuits to switch to tty6, log in and execute "killall chromiumbrowser && killall chromium" This is way faster than starting a new terminal in X, just starting a terminal seems to heavy for compiz under these circumstances. Waiting until its over takes more than 30 minuits, if it ends at all. The exact circumstances are difficult to replicate. Several tabs have to be open, usualy 8 or more. It seems that the chance to increases when more complex sites like gmail of plugins like flash are running. Opening several new tabs at omgubunt.co.uk has the best chance to replecate this isue. I have no idea where to start looking for a solution. Any help would be greatly apreciated ubuntu 12.10 | 2GB | 2x 1.66GHz Intel | 32bit | IBM Thinkpad R60e

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  • HTML5 game engine for a 2D or 2.5D RPG style "map walk"

    - by stargazer
    please help me to choose a HTML5 game engine or Javascript libraries I want to do the following in the game: when the game starts a part the huge map (full size of the map: about 7 screens) is shown. The map itself is completely designed in the editor mapeditor.org (or in some comparable editor - if you know a good alternative to mapeditor.org - let me know) and loaded at runtime or at design time. The game engine should support loading of isometric maps (well, in worst case only orthogonal maps will be sufficient) both "tile layer" and "object layer" from mapeditor.org should be supported. Scrolling/performance of this map should be fast enough. The map and the game should be either in 2D (orthogonal map) or in 2.5D (isometric map) The game engine should support movement of sprites with animation. Let say I have a sprite for "human" with animation sequences showing "walking" in 8 directions - it should be imported into game engine and should "walk" on the map without writing a lot of Javascript code. Automatic scrolling of the map the "human" nears the screen border. Collision detection, "solid" objects. The mapeditor.org supports properies on tiles. Let say I assign a "solid" property to some tiles in editor. It should be easy to check this "solid" property in the game engine and implement kind of "solid" behavior, so the animanted sprites do not walk through the walls. Collision detection - it should be easy to implement some custom functionality like "when sprite A is close to sprite B - call this function" Showing "dialogs" or popup windows on top of the map - should be easy to implement. Cross-browser audio support - (it is implemented quite well in construct 2 from scirra, so I'm looking for the comparable audio quality) The game itself is a king of RPG but without fighting scenes and without huge "inventory". The main character just walking on the map, discovers some things, there are dialogs and sounds. The functionality of this example from sprite.js http://batiste.dosimple.ch/sprite.js/tests/mapeditor/map_reader.html is very close to what I'm developing. But I'm not a Javascript guru (and a very lazy guy) and would like to write even less Javascript code as in the example...

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  • lucid 10.04 LTS => Precise 12.04.1 : upgrade doesn't work

    - by Rastom
    I googled and looked into all unkown issues on ubuntu forums but I can't figure out why a 10.04 LTS server won't detect the last LTS 12.04.1. I guess since 12.04 is a fresh dist, not much is reported for related issues Here is what I did : apt-get update apt-get upgrade apt-get install update-manager-core it was already installed so no update for this package. I checked : /etc/update-manager/release-upgrades [DEFAULT] # Default prompting behavior, valid options: # # never - Never check for a new release. # normal - Check to see if a new release is available. If more than one new # release is found, the release upgrader will attempt to upgrade to # the release that immediately succeeds the currently-running # release. # lts - Check to see if a new LTS release is available. The upgrader # will attempt to upgrade to the first LTS release available after # the currently-running one. Note that this option should not be # used if the currently-running release is not itself an LTS # release, since in that case the upgrader won't be able to # determine if a newer release is available. Prompt=lts I also checked my sourcelist before running apt-get : /etc/apt/sources.list deb http://archive.ubuntu.com/ubuntu/ lucid main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ lucid-security main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ lucid-updates main restricted universe multiverse deb http://security.ubuntu.com/ubuntu lucid-security main restricted deb-src http://security.ubuntu.com/ubuntu lucid-security main restricted deb http://security.ubuntu.com/ubuntu lucid-security universe deb-src http://security.ubuntu.com/ubuntu lucid-security universe deb http://security.ubuntu.com/ubuntu lucid-security multiverse deb-src http://security.ubuntu.com/ubuntu lucid-security multiverse # deb http://landscape.canonical.com/packages/hardy ./ # deb-src http://landscape.canonical.com/packages/hardy ./ and then following Ubuntu guide for Precise upgrade the command below should work : root@xxxxxxxxx:/etc/apt# do-release-upgrade -d Checking for a new ubuntu release No new release found So am I missing something ? The server was accessing outside through a proxy but I grant direct access to this server to avoid any Internet access problem or redirection but no clue... Any help would be appreciated

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  • Google Chrome for Mac, CSS colors and display profiles

    - by Trevor Burnham
    So, I'm aware that some browsers correct the colors in images in accordance with system settings, and that browsers differ in how they do this. But I'm very surprised when a color specified in a stylesheet appears different from one browser to another on the same system. With the latest Safari and Firefox, if I draw a div with background: #885500, I get a box with that color (as confirmed by the native DigitalColor Meter app): But when I load the same page in Chrome (Mac version 12.0.742.91) on the same system, a MacBook Pro with the default "Color LCD" display profile set, I get a noticeably different-colored box (DigitalColor Meter reports #a34d00—much more red, a bit less green): I tried a few different color profiles, and found that the color reported by DigitalColor Meter changed under Chrome. It stays constant in Safari. What's going on? Is it that Chrome is adjusting its colors depending on the system's display profile, or is it that Safari and Firefox are doing so? Does this happen under other operating systems, or is it purely a Mac phenomenon? And is there any way, from CSS/JavaScript, to detect/prevent this behavior so that colors are consistent across modern browsers on the same system?

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  • Reinstalled Ubuntu 12.04 and now I cannot change preferences like theme, wallpaper, and nautilus preferences

    - by krishnab
    So I just down-rev'd ubuntu from 13.04 back to 12.04 LTS desktop 64 (Precise). I am using Unity. I just reformatted the Ubuntu partition, but kept my home directory intact, and everything seemed to reconnect just fine. No data was lost. However, I found that I cannot seem to change my preferences. So I cannot seem to change my desktop background, no matter how many ways I try--Ubuntu Tweak, Gnome Tweak, system settings. I also cannot change the system GTK+ theme, though apparently I am able to change the windows border theme. Further, I cannot seem to change my Nautilus preferences--so I cannot seem the make the default view a list view, and I cannot make the "single-click" behavior the default. I even went into the nautilus org.gnome.nautilus settings to manually change things, but no luck. I thought it was a permissions issue, so I did a chown on the home folder and on the .gvfs folder. Still no luck. So somewhere there seems to be a permission that I am not catching. Does anyone have any suggestions? Thanks.

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  • REST and redirecting the response

    - by Duane Gran
    I'm developing a RESTful service. Here is a map of the current feature set: POST /api/document/file.jpg (creates the resource) GET /api/document/file.jpg (retrieves the resource) DELETE /api/document/file.jpg (removes the resource) So far, it does everything you might expect. I have a particular use case where I need to set up the browser to send a POST request using the multipart/form-data encoding for the document upload but when it is completed I want to redirect them back to the form. I know how to do a redirect, but I'm not certain about how the client and server should negotiate this behavior. Two approaches I'm considering: On the server check for the multipart/form-data encoding and, if present, redirect to the referrer when the request is complete. Add a service URI of /api/document/file.jpg/redirect to redirect to the referrer when the request is complete. I looked into setting an X header (X-myapp-redirect) but you can't tell the browser which headers to use like this. I manage the code for both the client and the server side so I'm flexible on solutions here. Is there a best practice to follow here?

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  • Fraud Detection with the SQL Server Suite Part 1

    - by Dejan Sarka
    While working on different fraud detection projects, I developed my own approach to the solution for this problem. In my PASS Summit 2013 session I am introducing this approach. I also wrote a whitepaper on the same topic, which was generously reviewed by my friend Matija Lah. In order to spread this knowledge faster, I am starting a series of blog posts which will at the end make the whole whitepaper. Abstract With the massive usage of credit cards and web applications for banking and payment processing, the number of fraudulent transactions is growing rapidly and on a global scale. Several fraud detection algorithms are available within a variety of different products. In this paper, we focus on using the Microsoft SQL Server suite for this purpose. In addition, we will explain our original approach to solving the problem by introducing a continuous learning procedure. Our preferred type of service is mentoring; it allows us to perform the work and consulting together with transferring the knowledge onto the customer, thus making it possible for a customer to continue to learn independently. This paper is based on practical experience with different projects covering online banking and credit card usage. Introduction A fraud is a criminal or deceptive activity with the intention of achieving financial or some other gain. Fraud can appear in multiple business areas. You can find a detailed overview of the business domains where fraud can take place in Sahin Y., & Duman E. (2011), Detecting Credit Card Fraud by Decision Trees and Support Vector Machines, Proceedings of the International MultiConference of Engineers and Computer Scientists 2011 Vol 1. Hong Kong: IMECS. Dealing with frauds includes fraud prevention and fraud detection. Fraud prevention is a proactive mechanism, which tries to disable frauds by using previous knowledge. Fraud detection is a reactive mechanism with the goal of detecting suspicious behavior when a fraudster surpasses the fraud prevention mechanism. A fraud detection mechanism checks every transaction and assigns a weight in terms of probability between 0 and 1 that represents a score for evaluating whether a transaction is fraudulent or not. A fraud detection mechanism cannot detect frauds with a probability of 100%; therefore, manual transaction checking must also be available. With fraud detection, this manual part can focus on the most suspicious transactions. This way, an unchanged number of supervisors can detect significantly more frauds than could be achieved with traditional methods of selecting which transactions to check, for example with random sampling. There are two principal data mining techniques available both in general data mining as well as in specific fraud detection techniques: supervised or directed and unsupervised or undirected. Supervised techniques or data mining models use previous knowledge. Typically, existing transactions are marked with a flag denoting whether a particular transaction is fraudulent or not. Customers at some point in time do report frauds, and the transactional system should be capable of accepting such a flag. Supervised data mining algorithms try to explain the value of this flag by using different input variables. When the patterns and rules that lead to frauds are learned through the model training process, they can be used for prediction of the fraud flag on new incoming transactions. Unsupervised techniques analyze data without prior knowledge, without the fraud flag; they try to find transactions which do not resemble other transactions, i.e. outliers. In both cases, there should be more frauds in the data set selected for checking by using the data mining knowledge compared to selecting the data set with simpler methods; this is known as the lift of a model. Typically, we compare the lift with random sampling. The supervised methods typically give a much better lift than the unsupervised ones. However, we must use the unsupervised ones when we do not have any previous knowledge. Furthermore, unsupervised methods are useful for controlling whether the supervised models are still efficient. Accuracy of the predictions drops over time. Patterns of credit card usage, for example, change over time. In addition, fraudsters continuously learn as well. Therefore, it is important to check the efficiency of the predictive models with the undirected ones. When the difference between the lift of the supervised models and the lift of the unsupervised models drops, it is time to refine the supervised models. However, the unsupervised models can become obsolete as well. It is also important to measure the overall efficiency of both, supervised and unsupervised models, over time. We can compare the number of predicted frauds with the total number of frauds that include predicted and reported occurrences. For measuring behavior across time, specific analytical databases called data warehouses (DW) and on-line analytical processing (OLAP) systems can be employed. By controlling the supervised models with unsupervised ones and by using an OLAP system or DW reports to control both, a continuous learning infrastructure can be established. There are many difficulties in developing a fraud detection system. As has already been mentioned, fraudsters continuously learn, and the patterns change. The exchange of experiences and ideas can be very limited due to privacy concerns. In addition, both data sets and results might be censored, as the companies generally do not want to publically expose actual fraudulent behaviors. Therefore it can be quite difficult if not impossible to cross-evaluate the models using data from different companies and different business areas. This fact stresses the importance of continuous learning even more. Finally, the number of frauds in the total number of transactions is small, typically much less than 1% of transactions is fraudulent. Some predictive data mining algorithms do not give good results when the target state is represented with a very low frequency. Data preparation techniques like oversampling and undersampling can help overcome the shortcomings of many algorithms. SQL Server suite includes all of the software required to create, deploy any maintain a fraud detection infrastructure. The Database Engine is the relational database management system (RDBMS), which supports all activity needed for data preparation and for data warehouses. SQL Server Analysis Services (SSAS) supports OLAP and data mining (in version 2012, you need to install SSAS in multidimensional and data mining mode; this was the only mode in previous versions of SSAS, while SSAS 2012 also supports the tabular mode, which does not include data mining). Additional products from the suite can be useful as well. SQL Server Integration Services (SSIS) is a tool for developing extract transform–load (ETL) applications. SSIS is typically used for loading a DW, and in addition, it can use SSAS data mining models for building intelligent data flows. SQL Server Reporting Services (SSRS) is useful for presenting the results in a variety of reports. Data Quality Services (DQS) mitigate the occasional data cleansing process by maintaining a knowledge base. Master Data Services is an application that helps companies maintaining a central, authoritative source of their master data, i.e. the most important data to any organization. For an overview of the SQL Server business intelligence (BI) part of the suite that includes Database Engine, SSAS and SSRS, please refer to Veerman E., Lachev T., & Sarka D. (2009). MCTS Self-Paced Training Kit (Exam 70-448): Microsoft® SQL Server® 2008 Business Intelligence Development and Maintenance. MS Press. For an overview of the enterprise information management (EIM) part that includes SSIS, DQS and MDS, please refer to Sarka D., Lah M., & Jerkic G. (2012). Training Kit (Exam 70-463): Implementing a Data Warehouse with Microsoft® SQL Server® 2012. O'Reilly. For details about SSAS data mining, please refer to MacLennan J., Tang Z., & Crivat B. (2009). Data Mining with Microsoft SQL Server 2008. Wiley. SQL Server Data Mining Add-ins for Office, a free download for Office versions 2007, 2010 and 2013, bring the power of data mining to Excel, enabling advanced analytics in Excel. Together with PowerPivot for Excel, which is also freely downloadable and can be used in Excel 2010, is already included in Excel 2013. It brings OLAP functionalities directly into Excel, making it possible for an advanced analyst to build a complete learning infrastructure using a familiar tool. This way, many more people, including employees in subsidiaries, can contribute to the learning process by examining local transactions and quickly identifying new patterns.

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