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  • Learning how to design knowledge and data flow [closed]

    - by max
    In designing software, I spend a lot of time deciding how the knowledge (algorithms / business logic) and data should be allocated between different entities; that is, which object should know what. I am asking for advice about books, articles, presentations, classes, or other resources that would help me learn how to do it better. I code primarily in Python, but my question is not really language-specific; even if some of the insights I learn don't work in Python, that's fine. I'll give a couple examples to clarify what I mean. Example 1 I want to perform some computation. As a user, I will need to provide parameters to do the computation. I can have all those parameters sent to the "main" object, which then uses them to create other objects as needed. Or I can create one "main" object, as well as several additional objects; the additional objects would then be sent to the "main" object as parameters. What factors should I consider to make this choice? Example 2 Let's say I have a few objects of type A that can perform a certain computation. The main computation often involves using an object of type B that performs some interim computation. I can either "teach" A instances what exact parameters to pass to B instances (i.e., make B "dumb"); or I can "teach" B instances to figure out what needs to be done when looking at an A instance (i.e., make B "smart"). What should I think about when I'm making this choice?

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  • Drupal 7 on Windows - File Module Problems

    - by TimothyP
    Installed Drupal 7 using the Web Platform installer on Windows 2008 For some reason, the file module, when you upload a file, uses the first few letters of the filename as the unique key to store in the database, which of course causes problems very fast. I'm wondering does anybody have a workaround for this? An AJAX HTTP request terminated abnormally. Debugging information follows. Path: /file/ajax/field_file/und/0/form-EBMatHzV5cZXcWvXJtdADSdyw7Id9-GIpFM_NCJg_a4 StatusText: n/a ResponseText: Error message PDOException: SQLSTATE[23000]: [Microsoft][SQL Server Native Client 10.0][SQL Server]Cannot insert duplicate key row in object 'dbo.file_managed' with unique index 'uri_unique'. in drupal_write_record() (line 6776 of ..........\includes\common.inc). Error The website encountered an unexpected error. Please try again later. ReadyState: undefined (PS: I hope superuser is the right place to ask)

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  • Generating random tunnels

    - by IVlad
    What methods could we use to generate a random tunnel, similar to the one in this classic helicopter game? Other than that it should be smooth and allow you to navigate through it, while looking as natural as possible (not too symmetric but not overly distorted either), it should also: Most importantly - be infinite and allow me to control its thickness in time - make it narrower or wider as I see fit, when I see fit; Ideally, it should be possible to efficiently generate it with smooth curves, not rectangles as in the above game; I should be able to know in advance what its bounds are, so I can detect collisions and generate powerups inside the tunnel; Any other properties that let you have more control over it or offer optimization possibilities are welcome. Note: I'm not asking for which is best or what that game uses, which could spark extended discussion and would be subjective, I'm just asking for some methods that others know about or have used before or even think they might work. That is all, I can take it from there. Also asked on stackoverflow, where someone suggested I should ask here too. I think it fits in both places, since it's as much an algorithm question as it is a gamedev question, IMO.

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  • Why is my wireless so slow compared to my wired download speed?

    - by Shawn
    I just used speedtest.net (using Firefox) to compare my wired connection speed with my wireless connection speed. With my current contract (with Videotron), I'm supposed to get Download speed: 8Mbps Upload speed: 1Mbps Here are the results of the speedtest.net test: Wired Ping: 14ms Download speed: 8.41Mbps Upload speed: 1.04Mbps Wireless Ping: 16ms Download speed: 0.18Mbps Upload speed: 0.98Mbps The difference in download speeds seems staggering to me since I did the test 1 meter aways from my router. Any clue as to why my wireless download speed is so low compared to my wired download speed? using Ubuntu 11.04 on an Acer Aspire 5536-5519 Oh and it might be worth mentioning that my girlfriend has no trouble at all with her wireless connection. No slowness at all. (She uses Firefox on Windows 7 on a Dell) Here's the results for the same test on her system: Ping: 22ms Download speed; 8.44Mbps Upload speed: 1.02Mbps

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  • Any good resources on setting up an ubuntu virtual machine for web development?

    - by Relequestual
    I'm currently on my placement year at uni with 4 months left. Before working at my current place, I have not used a nix environment for web development and have used WAMP. Over the past year I have found some very interesting new tech that requires a bit more than my shared hosting even to play with (eg node.js, RoR 3). At work we use a Virtual Machine for development, but that's all been set up and configured to match the live servers, and is managed with a Puppet server. Are there any really good resources for setting up and configuring an Ubuntu VM as a web server? Work currently uses Ubuntu so I would assume this is a good OS to use. I do of course know how to use google, but the noise ratio is just too big, so thought I'd ask here, as I know many of you will have a ton of bookmarks. Cheers.

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  • Odd SVN Checkout failures occur frequenctly on VMWare virtual machines

    - by snowballhg
    We've recently been experiencing seemingly random SVN checkout failures on our Hudson build system. Google search has failed me; I'm hoping the super user community can help me out :-) We are occasionally receiving the following SVN error when our Hudson build jobs checkout source via the Hudson Subversion plug-in (which uses svn kit): ERROR: Failed to check out http://server/svnroot/trunk org.tmatesoft.svn.core.SVNException: svn: Processing REPORT request response failed: XML document structures must start and end within the same entity. (/svnroot/!svn/vcc/default) svn: REPORT request failed on '/svnroot/!svn/vcc/default' This issue seems to only occur when checking out from our Virtual Machines (Windows XP, Fedora 9, Fedora 12) using Hudson's SVN Plug-in. Systems that use the traditional SVN client seem to work. SVN Server version: 1.6.6 Hudson version: 1.377 Hudson SVN Plugin Version: 1.17 Has anyone dealt with this issue, or have any suggestions? Thanks

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  • Need advise on linking apache and tomcat

    - by hsnm
    I have been searching this for hours with no luck. I have a web server that uses https on Apache2. I also have installed tomcat7 on the same server to run some Java webapp on it. I need to keep my https port 443 on Apache but forward the requests to the Java webapp to tomcat. I tried to use mod_jk to redirect the requests to tomcat but I failed. Most tutorials talk about redirecting plain http requests not https. I also could not let tomcat use https on 8443. I'm following the steps here but facing errors. The question: Can I redirect https traffic to tomcat without installing https on tomcat? Is there a good tutorial you can recommend to me?

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  • Should I use subdomains or subfolders for my user groups?

    - by bilygates
    Hello, I run a photography website where each user has its own subdomain (i.e. user.site.com). I'm thinking of adding user groups but I'm unable to decide if I should also associate a separate subdomain or simply a subfolder for each group: Subfolders (www.site.com/groups/my-group) Pros: Easier to maintain from a tehnical p.o.v. Cons: Harder to memorize. The URLs can get really long (www.site.com/groups/my-group/albums/my-album/) Subdomains (my-group.site.com) Pros: Easier to memorize. Shorter URLs. One might have the impression that such an URL is somewhat more "independent" from the main site. Cons: Group and user names belong to the same name space, so we need to check for collisions when creating a new user/group. One cannot determine the content of the page by only reading the URL: Is x.site.com a user page or a group page? What's your opinion on the matter? I should note that DeviantArt.com uses the 2nd option (that's where I got the idea). Thank you in advance!

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  • Intermittent graphics issue

    - by Rob
    An older (~3 year old) PC I have passed on to my younger brother has a Sony 17" LCD monitor and uses on-board Intel GMA 3100 graphics (supports Aero under Windows 7 and no more is required). Recently he has complained to me twice that after booting up the screen looks all 'fuzzy'. Initially I thought maybe he messed up the ClearType settings by mistake, but resetting that did nothing. The only thing that finally worked was changing the resolution to something else temporarily, then setting it back to the original native (highest supported) resolution. The second time this happened the same 'fix' worked. This is happening only intermittently as of now and is not predictable/reproducible. I suspect either the monitor or on-board graphics is dying. How can I check and confirm which of the two it is (or maybe something else you guys can think of)? If it's the on-board graphics, would I be able to keep using the same motherboard with the addition of a cheap PCI-E graphics card?

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  • Proxying/Tunneling IPSec traffic via netcat or SOCKS?

    - by MattC
    I have a client that is using a SonicWall router as their VPN concentrator. I downloaded the client software and set up the router as a peer. My issue is that my company uses a dual DMZ setup, meaning we have an interior firewall, then a bunch of DMZ servers, then an external firewall, then finally the telco router. In this setup, the interior firewall has no way to communicate with the exterior firewall since they are on two totally separate subnets. The communication occurs through the servers that straddle the networks. In this case, I need some way to forward the ISAKMP/IPSec traffic from my desktop out to the Internet. My usual trick of using netcat on the intermediate proxy server doesn't work here since it's not TCP/UDP traffic as far as I can tell. All of my previous experience with VPN's have been using SSL-based VPN's which are clearly very easily proxy-able. Any help would be appreciated, thanks!

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  • How do I transfer videos from DV camera to divx?

    - by Ward
    I have a videocamera that uses mini-dv tapes. In the past, I've transferred the files and made DVDs, but that was time- and disk-space- consuming. I wanted to find new tools and to figure out how to convert the videos to something smaller like divx but I didn't know enough about all the different formats to answer a previous question. Well, now I've done a bunch of research and I understand some of the details of video encoding, and in the process I wrote up some notes on the different formats involved in going from a DV videocam to divx or H.264 They're a bit rambling, but in case it's of any use, I'm going to post them as an answer. I'd be very interested in anyone else's answer as well.

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  • What is an Acer Converter Port?

    - by ShadowHero
    What is this port "Acer Converter Port"? Very little information can be found on the internet. It's basically the same as miniDP? Can I connect a monitor like Dell U2713H on this one? EDIT From this page: http://acer.custhelp.com/app/answers/detail/a_id/30837/~/frequently-asked-questions-on-the-aspire-r7-series 9. Can I connect a DisplayPort monitor to the Acer Converter Port? The Acer Converter Port uses the same physical port as a Mini DisplayPort, but is designed to connect to an Acer proprietary cable. If you connect a DisplayPort monitor, Acer cannot guarantee the functionality of the monitor. No damage should occur to either monitor or notebook by connecting a Mini DisplayPort cable. So, the question is, can someone confirm this will work for sure?

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  • Squid closing the connection on long HTTP GET requests

    - by Rhys
    When running a database query on a specific external site we use, Squid seems to cut off the connection after a consistent period of time (just over a minute). The query is submitted through a standard web form is that uses GET to query their database. Firefox 3 just displays a blank page. Internet Explorer throws a 'Page Cannot Be Displayed' error (tested in v6 and v8). When we perform the same query on the same machine, but bypass the Squid proxy, it works fine. The query takes about two and a half minutes to complete. There are a few timeout settings in Squid, but I honestly don't know what one to be looking at. Any possible solutions would be much appreciated. Cheers

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  • AWS RDS Mysql with benstalk Hibernate app: Character encoding issue

    - by TeraTon
    I'm running a webapp from amazon rds with tomcat 7 and spring, which uses hibernate as the persistence layer. The application and utf-8 encoding work properly on localhost, but for some reason when I deploy to amazon, the UTF-8 encoding breaks. I use mysql 5.5.27 on amazon rds and the table that we wish to update has collation set to utf8 - utf8_unicode_ci And in hibernate I have set: < prop key="hibernate.connection.charSet"UTF-8 UTF-8 characters get replaced by ??? and this is of course especially bad for passwords and usernames + email as it basically kills them. Anyone else encountered character encoding breaking when deploying to amazon?

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  • How do I get a different type of scrollbars in 12.04? [closed]

    - by Joseph Garvin
    Possible Duplicate: How do I disable overlay scrollbars? By default 12.04 uses overlay scroll bars that do not suit my taste, and every method I've found so far of disabling them makes them broken in a different way. When I was using 11.10 this wasn't a problem because I could still change the GTK theme. In 12.04, the Appearance settings only contain a few stock themes, and other than the special purpose contrast ones they all have the overlay scroll bars. If I aptitude search gtk3 | grep theme I get no results so there appears to be no packaged alternative either. Most suggestions I've seen for disabling the overlay scroll bars involve uninstalling packages or editing files as root. I want to disable them just for the current user, not for everyone on the whole box; as should be the case for any theme/display setting. There is a gsettings command that temporarily disables the overlay scrollbars just for the current user, but this has two problems of its own: The setting doesn't stick after log off. Because who would want to save settings? The scroll bars put in place have no contrast. They have a black scroller on a black background and are completely unusable. In short what I'd like to know is how to disable overlay scroll bars such that: My preference is user specific. My preference is actually saved. The scroller can actually be seen against the background without having to use a special high contrast theme that makes my whole desktop look like a negative photo from Tron.

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  • Connecting guest OS to host os internet connection hyper-v

    - by autrevo
    Hyper-V internal switch and VM OS interfacing with Guest OS and IP Cofiguration When configuring hyper-v internal switch, Apart from physical lan adapter (say adapter 1), I see another LAN adapter (say adapter 2) added in host os. And we already have one virtual lan adapter in guest os, (say adapter 3) . adapter 1 is connected to internet with defaulty gateway say, 192.168.0.254 and uses class C IP. By con configuring adapter 2 and 3, I need to acheive two purpose - Access internet in guest os. seemlessly share files & folders between guest and host OS. Please, suggest, What is the best way to configure IP of these three adapters ?

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  • Turn a Kindle into a Weather Display Station

    - by Jason Fitzpatrick
    The e-ink display, network connectivity, and low-power consumption of Kindle ebook readers make them a perfect candidate for an infrequently refreshed high-visibility display–like a weather display. Read on to see how to hack a Kindle to serve up the local weather. Tinker and hardware hacker Matt Petroff hacked his Kindle to accept input from a web server and then, graciously and in the spirit of geeky projects everywhere, shared his source code. He explains the heart of the project: The server side of the system uses shell and Python scripts to convert weather forecast data into an image for the Kindle. The scripts first download and parse forecast data from NOAA via the National Digital Forecast Database XML/SOAP Service. After parsing the data, the data then needs to be converted into an image. This is accomplished by preprocessing a specially crafted SVG file to insert temperatures, forecast symbols, and days of the week. This SVG is then rendered as a PNG using rsvg-convert and converted to a grayscale, no transparency color space as required by the Kindle using pngcrush. Finally, it is copied to a public location on the web server. The Kindle is set to refresh twice a day (you could easily tweak the scripts for a more frequent refresh) and displays the forecast as seen in the photo above–with crisp and easy to read text and icons. Hit up the link below for more information and the project’s source code. How To Create a Customized Windows 7 Installation Disc With Integrated Updates How to Get Pro Features in Windows Home Versions with Third Party Tools HTG Explains: Is ReadyBoost Worth Using?

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  • Is SEO affected negatively by having densely encoded identifiers of content in URLs?

    - by casperOne
    This isn't about where to put the id of a piece of unique content in URLs, but more about densely packing the URL (or, does it just not matter). Take for example, a hypothetical post in a blog: http://tempuri.org/123456789/seo-friendly-title The ID that uniquely identifies this is 123456789. This corresponds to a look-up and is the direct key in the underlying data store. However, I could encode that in say, hexadecimal, like so: http://tempuri.org/75bcd15/seo-friendly-title And that would be shorter. One could take it even further and have more compact encodings; since URLs are case sensitive, one could imagine an encoding that uses numbers, lowercase and uppercase letters, for a base of 62 (26 upper case + 26 lower case + 10 digits): 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz For a resulting URL of: http://tempuri.org/8M0kX/seo-friendly-title The question is, does densely packing the ID of the content (the requirement is that an ID is mandatory for look-ups) have a negative impact on SEO (and dare I ask, might it have any positive impact), or is it just not worth the time? Note that this is not for a URL shortening service, so saving space in the URL for browser limitation purposes is not an issue.

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  • PHP processes run one at a time, always taking 100% of one core

    - by Derek Kurth
    We have seven websites written in PHP running on a Windows 2008 server with IIS 7.5. They are all very slow right now. When I look in Task Manager, I see around 10 php-cgi.exe processes, and they are all taking 0% of the CPU, except one, which is taking 25%. It's a quad-core server, so it's taking 100% of one core. If I watch for a few seconds, the process taking 25% will go to 0%, and a different php-cgi.exe process will jump to 25%. So all the php-cgi.exe processes are just lined up, waiting on a single core, and each process uses 100% of the processor when it can. Each of the 7 sites is in its own application pool in IIS, and we're using FastCGI. The PHP version is 5.3. Any ideas? Thanks!

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  • what to use instead of laptop-mode?

    - by playcat
    hello, i have ubuntu 10.10 64bit on hp 6735s (turion processor). it overheats, and i'm forced to use turion power control in order to keep core temperature to a reasonable level. one more measure that i use is putting my processors to conservative mode. that way, i'm perfectly happy with its performance, and heat is where it should be. however, after my latest upgrade, something happened - cores are back to ondemand by default, and i'm not sure if turionpowercontrol is working any more (ps axu | grep urion shows no process). in addition, i read somewhere that laptop-mode uses hdd spindown for preserving data/energy, and that hdds have only a limited amount of those spindowns, so laptop-mode usage can actually shorten the life of my hdd. i'm wondering if there is a good way to set my cores to automatically go to conservative mode? also, what's the good way to see what is the voltage my cores use? on windows i use cpuz tools. thx and sorry for the long explanation.

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  • Restoring openldap configuration from ldif file?

    - by Solignis
    I am trying to restore my OpenLDAP server from an ldif file I made before it went horribly wrong. All of the websites I found talk about using slapadd but when I run slapadd -v -l ~ns01/openldap_config.ldif it returns the error Could not stat config file "/etc/ldap/slapd.conf" : No such file or directory (2) slapadd: bad configuration file! When I look in the directory indeed the file does not exist, but this is because Ubuntu 11.10 is running in RTC mode, my LDAP server uses the /etc/slapd.d/cn=config for the configuration. So? What am I missing? Is slapadd the wrong tool to use? As I said above I running on Ubuntu 11.10 server edition 64-bit.

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  • 8 Character Device names

    - by Lee Harrison
    Is there any reason to still use only 8 characters in a device name? My boss still uses this rule for printers, computers, routers, servers... basicly any device connected to our network. This leads to massive confusion among users, especially when it comes to printer. It also leads to confusion from an administration standpoint because every device is named vaguely, and similarly(its only 8 characters!). I understand the history behind this and compatibility with older systems, but none of our legacy systems will ever make use of PS-printers and Wifi networks. Is there any reason to still do this, and what is everyone else doing when it comes to naming network devices at an enterprise level?

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  • NFS users getting a laggy GUI expierence

    - by elzilrac
    I am setting up a system (ubuntu 12.04) that uses ldap, pam, and autofs to load users and their home folders from a remote server. One of the options for login is sitting down at the machine and starting a GUI session. Programs such as chormium (browser) that preform many read/write operations in the ~/.cache and ~/.config files are slowing down the GUI experience as well as putting strain of the NFS server that is causing other users to have problems. Ubuntu had the handy-dandy XDG_CONFIG_HOME and XDG_CACHE_HOME variables that can be set to change the default location of .cache and .config from the home folder to somewhere else. There are several places to set them, but most of them are not optimal. /etc/environment pros: will work across all shells cons: cannot use variables like $USER so that you can't make users have different new locations for .cache and .config. Every users' new location would be the same directory. /etc/bash.bashrc pros: $USER works, so you can place them in different folders cons: only gets run for bash compatible shells ~/.pam_environment pros: works regardless of shell cons: cannot use system variables (like $USER), has it's own syntax, and has to be created for every user

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  • A space-efficient filesystem for grow-as-needed virtual disks ?

    - by Steve Schnepp
    A common practice is to use non-preallocated virtual disks. Since they only grow as needed, it makes them perfect for fast backup, overallocation and creation speed. Since file systems are usually based on physical disks they have the tendency to use the whole area available1 in order to increase the speed2 or reliability3. I'm searching a filesystem that does the exact opposite : try to touch the minimum blocks need by an aggressive block reuse. I would happily trade some performance for space usage. There is already a similar question, but it is rather general. I have very specific goal : space-efficiency. 1. Like page caching uses all the free physical memory 2. Canonical example : online defragmentation 3. Canonical example : snapshotting

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  • software to monitor internet usage on an XP PC? (browser + non-browser)

    - by user39316
    Hi Is there any (ideally open source) software for Windows that can be used on a PC, to monitor the usage of internet from that PC? It would need to include both browser and non-browser sources (e.g. a service that sync's calendar to gmail). So any software on your PC that uses would need to be configured to point to this local internet monitoring software/proxy. The monitoring software/proxy then would be configured to point to the company proxy server (address, port & credentials). Things that come to mind that might be close but not really focused on solving this might be perhaps: Charles Proxy, Fiddler 2, SQUID? The idea would be it could give you a daily/weekly/monthly report of internet upload/download usage on a per program/process/service basis for the PC it is being run on. thanks

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