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  • Using java to create a logistic model - arrays and properties

    - by Oliver Burdekin
    I'm currently trying to create a java model that will solve a problem we have. On a voluntary expedition each week we have some people leaving and some new people arriving. Accommodation is in tents. The tents sleep different numbers of people and certain rules apply. Males and females cannot be mixed and volunteers can be one of four types - school children/ research assistants/ scientific staff/ school teachers So types of volunteer and sexes cannot be mixed. Each week the manager spends hours trying to work this out so I've offered to make this model to keep my coding skills up. At present I'm working with arrays. Each tent is a 2D array [4][x] where x is the number of people it sleeps (each person sleeping there has 4 attributes). Each person is a 1D array with 4 attributes [4]. The idea is to check where people can go, cause the minimum movement for people staying on and solve this logistic problem. Does anyone have any better suggestions as to how to solve this? At present I'm finding it necessary to write a lot of code setting up and querying arrays. Any help is appreciated.

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  • Firefox not honoring must-revalidate cache headers returned by jQuery.ajax() request

    - by Oliver Weichhold
    UPDATE 1: Judging by this thread I am not the only one having this problem in FF 12 and only in 12. UPDATE 2: The problem does not seem to be limited to Ajax requests. From the looks of it everything that makes it into Firefox 12's cache will be fetched from there. No matter what. The server can specify cache control headers all day long. Bummer! What I'm trying to achieve is the following behavior: Browser may cache the response without revalidating for up to 5 minutes I don't care if the browser revalidates on every request (Both Chrome and IE9 do for example) When the expiration is up the browser MUST revalidate (which in my case will result in fresh data) Chrome and IE9 exhibit the desired behavior when issuing a jquery.ajax() request with ifModified: true and cache: true while Firefox 12 never revalidates, which poses a serious problem. These are the actual response headers: HTTP/1.1 200 OK Server: nginx Date: Sun, 03 Jun 2012 07:13:43 GMT Content-Type: text/javascript; charset=UTF-8 Transfer-Encoding: chunked Connection: keep-alive Vary: Accept-Encoding Cache-Control: private, must-revalidate, max-age=300 Last-Modified: Sun, 03 Jun 2012 07:07:13 GMT Content-Encoding: gzip Any suggestions?

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  • c# Why can't open generic types be passed as parameters?

    - by Rich Oliver
    Why can't open generic types be passed as parameters. I frequently have classes like: public class Example<T> where T: BaseClass { public int a {get; set;} public List<T> mylist {get; set;} } Lets say BaseClass is as follows; public BaseClass { public int num; } I then want a method of say: public int MyArbitarySumMethod(Example example)//This won't compile Example not closed { int sum = 0; foreach(BaseClass i in example.myList)//myList being infered as an IEnumerable sum += i.num; sum = sum * example.a; return sum; } I then have to write an interface just to pass this one class as a parameter as follows: public interface IExample { public int a {get; set;} public IEnumerable<BaseClass> myIEnum {get;} } The generic class then has to be modified to: public class Example<T>: IExample where T: BaseClass { public int a {get; set;} public List<T> mylist {get; set;} public IEnumerable<BaseClass> myIEnum {get {return myList;} } } That's a lot of ceremony for what I would have thought the compiler could infer. Even if something can't be changed I find it psychologically very helpful if I know the reasons / justifications for the absence of Syntax short cuts.

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  • How do you handle multiple (overlapping) projects in trac?

    - by Oliver Giesen
    We are using trac and are really satisfied with it. However, out of the box, trac is best suited for single-project environments only. I'd be interested to hear about the various approaches people take to make it work with multiple projects nevertheless and their experiences with them. Are there any plugins to recommend? Any patches, tweaks or whatnots? Are you maybe even using an entirely different bug-tracking system that offers all of trac's functionality plus multi-project support? We recently started managing a second project ourselves which generally works okay but also has some drawbacks, especially where the two projects overlap because of common library code we wrote that is used in both projects. How do you handle this? (I'll attach our own current approach as an answer to this post.)

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  • ORDERING A MYSQL QUERY WITH JOINS AND GROUPS

    - by Oliver
    I have this mysql query: SELECT * FROM Customer c JOIN eHRDemographic ehD ON ehD.CxID = c.CustomerID JOIN CustPrimaryWeight cpW ON cpW.CxID = c.CustomerID WHERE c.CustomerID =22703 GROUP BY c.CustomerID ORDER BY cpW.CustPrimaryWeightID DESC This doesn't really work correctly as the CustPrimaryWeight table has multiple enteries and it's simply joining the first entry and not the more recent one as the ORDER statement doesn't seem to do anything. Any ideas?

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  • Objective-C : Changing "self" value inside self

    - by Oliver
    Hello, I have a category on NSDate, and I want to implement some functions to manipulate the date, like : NSDate *thedate = [NSDate date]; [thedate setToMidnight]; so I have a function in NSDate like : -(void)setToMidnight { some code with calendars and comps self = theNewDate; } This works inside the function, but outside this member function, thedate has not changed. I understand this malfunction because I've been told that self is just a local variable created inside the member function. So, how can I make this work ? Of course, I could have written : thedate = [thedate dateAsMidnightDate] or thedate = [NSDate dateAtMidnightFromDate:thedate] but I feel it has more sense inside the instance class, as I don't want to change the date but just adjust some values of the previously created one. Can you help me to achieve this ?

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  • cocos2d - how to draw a bottle sprite with dynamically changing water level

    - by Oliver
    I am trying to draw a (2d) sprite in cocos2d showing a bottle. The bottle shall be able to have a dynamic water level (i.e. the amount of water in the bottle can change over the lifetime of the sprite). I am wondering how to do this. I currently have a PNG file of the empty bottle. I adjusted the alpha channel of that PNG so when rendering the sprite I can draw a blue rectangle and render the bottle texture over it. That will give the impression of the water being inside the bottle. However, the bottle's shape is not a rectangle itself of course, so the water can be seen out of the bounds of the bottle. I can change the bottle image in a way that only the bottle itself is transparent and set the "outside world" to an opaque color & alpha channel value, but that again prevents the "world background" to be visible in that area. I simply don't have a clue how to realize this in a sane manner. Do I really have to read every pixel of the bottle image, identify which pixel is "inside" of the bottle and then draw the water pixel by pixel? There must be an easier way, right? ;) Any best practices for these kinds of tasks? edit: see picture below, to make somewhat clearer, what I am talking about ;) http://i47.tinypic.com/10rqww0.png

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  • correct technical term for this pattern

    - by Oliver A.
    sometimes I use a pattern which is very similar to the singleton pattern: There is one default instance which and a static get method to aces it. But you may create other instances and pass it as optional parameter and if you want to and you can even replace the default instance with a instance from a child class. So it is NO SINGLETON at all but it is used like one singleton in most cases. Anyone got an idea who to call something like this ? Maybe half*** singleton? domiton?

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  • SVN user guidelines

    - by Oliver Moran
    I have been tasked with writing a set of user guidelines for SVN for developers in my company. The guidelines are to be solely from a user perspective (e.g. commit comments, when to commit) and not from an administrative perspective (e.g. when to tag, how to structure). An administrative guideline will be written in a separate document. We are an app development house involved also in embedded development. So our developers range from HTML5 and Flash to Java and C. Some of our coding involves forking very large (millions of files) code bases. Other parts involve us engaging in ground-up development. Are there any best practices for use of SVN from a user (i.e. grunt developer) perspective?

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  • Spikes of 99% disk activity in Windows 8 Task Manager

    - by Jonathan Chan
    For some reason Windows 8's Task Manager reports spikes of 99% disk activity for hours at a time. Looking at the entries in that column, however, data doesn't seem to be getting written any more quickly than when the disk activity is around 25-50% (which it seem to idle at most of the time). Furthermore, when these 99% disk activity spikes are happening, the average response time reported in the Performance tab becomes 4000-6000ms. Is there a good way to find out what is causing the disk activity? I've tried using Process Explorer, but I said above, the rate at which data is reportedly being written doesn't seem to correspond (Dropbox and Google Chrome are constantly the top two, but the spikes are not dependent on their being open). Thanks in advance for any help. It gets very annoying when the computer stutters to a halt.

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  • SSL in tomcat with apr and Centos 6

    - by Jonathan
    I'm facing a problem setting up my tomcat with apr native lib, I have the following: Tomcat: 7.0.42 Java: 1.7.0_40-b43 OS: Centos 6.4 (2.6.32-358.18.1.el6.i686) APR: 1.3.9 Native lib: 1.1.27 OpenSSL: openssl-1.0.0-27.el6_4.2.i686 My server.xml looks like: ... <Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" /> ... <Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true" maxThreads="150" scheme="https" secure="true" clientAuth="false" sslProtocol="TLS" SSLCertificateFile="/tmp/monitoringPortalCert.pem" SSLCertificateKeyFile="/tmp/monitoringPortalKey.pem" SSLPassword="hide" /> ... I compiled the native lib as follow: ./configure --with-apr=/usr/bin/apr-1-config --with-ssl=yes --prefix=$CATALINA_HOME make && make install The APR is loaded ok: Oct 06, 2013 7:55:14 PM org.apache.catalina.core.AprLifecycleListener init INFO: Loaded APR based Apache Tomcat Native library 1.1.27 using APR version 1.3.9. But I'm still having this error: SEVERE: Failed to initialize the SSLEngine. org.apache.tomcat.jni.Error: 70023: This function has not been implemented on this platform ./configure outcome [root@localhost native]# ./configure --with-apr=/usr/bin/apr-1-config --with-ssl=yes -- prefix=$CATALINA_HOME && make && make install checking build system type... i686-pc-linux-gnu checking host system type... i686-pc-linux-gnu checking target system type... i686-pc-linux-gnu checking for a BSD-compatible install... /usr/bin/install -c checking for working mkdir -p... yes Tomcat Native Version: 1.1.27 checking for chosen layout... tcnative checking for APR... yes setting CC to "gcc" setting CPP to "gcc -E" checking for JDK location (please wait)... /usr/java/jdk1.7.0_40 from environment checking Java platform... checking Java platform... checking for sablevm... NONE adding "-I/usr/java/jdk1.7.0_40/include" to TCNATIVE_PRIV_INCLUDES checking os_type directory... linux adding "-I/usr/java/jdk1.7.0_40/include/linux" to TCNATIVE_PRIV_INCLUDES checking for gcc... gcc checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking for OpenSSL library... using openssl from /usr/lib and /usr/include checking OpenSSL library version... ok checking for OpenSSL DSA support... yes setting TCNATIVE_LDFLAGS to "-lssl -lcrypto" adding "-DHAVE_OPENSSL" to CFLAGS setting TCNATIVE_LIBS to "" setting TCNATIVE_LIBS to " /usr/lib/libapr-1.la -lpthread" configure: creating ./config.status config.status: creating tcnative.pc config.status: creating Makefile config.status: executing default commands make[1]: Entering directory `/usr/apache-tomcat-7.0.42/bin/tomcat-native-1.1.27- src/jni/native' make[1]: Nothing to be done for `local-all'. make[1]: Leaving directory `/usr/apache-tomcat-7.0.42/bin/tomcat-native-1.1.27- src/jni/native' make[1]: Entering directory `/usr/apache-tomcat-7.0.42/bin/tomcat-native-1.1.27- src/jni/native' make[1]: Nothing to be done for `local-all'. make[1]: Leaving directory `/usr/apache-tomcat-7.0.42/bin/tomcat-native-1.1.27- src/jni/native' /usr/lib/apr-1/build/mkdir.sh /usr/apache-tomcat-7.0.42/include/apr-1 /usr/apache- tomcat-7.0.42/lib/pkgconfig \ /usr/apache-tomcat-7.0.42/lib /usr/apache-tomcat-7.0.42/bin /usr/bin/install -c -m 644 tcnative.pc /usr/apache-tomcat-7.0.42/lib/pkgconfig/tcnative- 1.pc list=''; for i in $list; do \ ( cd $i ; make DESTDIR= install ); \ done /bin/sh /usr/lib/apr-1/build/libtool --mode=install /usr/bin/install -c -m 755 libtcnative-1.la /usr/apache-tomcat-7.0.42/lib libtool: install: /usr/bin/install -c -m 755 .libs/libtcnative-1.so.0.1.27 /usr/apache- tomcat-7.0.42/lib/libtcnative-1.so.0.1.27 libtool: install: (cd /usr/apache-tomcat-7.0.42/lib && { ln -s -f libtcnative- 1.so.0.1.27 libtcnative-1.so.0 || { rm -f libtcnative-1.so.0 && ln -s libtcnative- 1.so.0.1.27 libtcnative-1.so.0; }; }) libtool: install: (cd /usr/apache-tomcat-7.0.42/lib && { ln -s -f libtcnative- 1.so.0.1.27 libtcnative-1.so || { rm -f libtcnative-1.so && ln -s libtcnative-1.so.0.1.27 libtcnative-1.so; }; }) libtool: install: /usr/bin/install -c -m 755 .libs/libtcnative-1.lai /usr/apache-tomcat- 7.0.42/lib/libtcnative-1.la libtool: install: /usr/bin/install -c -m 755 .libs/libtcnative-1.a /usr/apache-tomcat- 7.0.42/lib/libtcnative-1.a libtool: install: chmod 644 /usr/apache-tomcat-7.0.42/lib/libtcnative-1.a libtool: install: ranlib /usr/apache-tomcat-7.0.42/lib/libtcnative-1.a libtool: install: warning: remember to run `libtool --finish /usr/local/apr/lib' make && make install outcome: make[1]: Entering directory `/usr/apache-tomcat-7.0.42/bin/tomcat-native-1.1.27- src/jni/native' make[1]: Nothing to be done for `local-all'. make[1]: Leaving directory `/usr/apache-tomcat-7.0.42/bin/tomcat-native-1.1.27- src/jni/native' make[1]: Entering directory `/usr/apache-tomcat-7.0.42/bin/tomcat-native-1.1.27- src/jni/native' make[1]: Nothing to be done for `local-all'. make[1]: Leaving directory `/usr/apache-tomcat-7.0.42/bin/tomcat-native-1.1.27- src/jni/native' /usr/lib/apr-1/build/mkdir.sh /usr/apache-tomcat-7.0.42/include/apr-1 /usr/apache- tomcat-7.0.42/lib/pkgconfig \ /usr/apache-tomcat-7.0.42/lib /usr/apache-tomcat-7.0.42/bin /usr/bin/install -c -m 644 tcnative.pc /usr/apache-tomcat-7.0.42/lib/pkgconfig/tcnative- 1.pc list=''; for i in $list; do \ ( cd $i ; make DESTDIR= install ); \ done /bin/sh /usr/lib/apr-1/build/libtool --mode=install /usr/bin/install -c -m 755 libtcnative-1.la /usr/apache-tomcat-7.0.42/lib libtool: install: /usr/bin/install -c -m 755 .libs/libtcnative-1.so.0.1.27 /usr/apache- tomcat-7.0.42/lib/libtcnative-1.so.0.1.27 libtool: install: (cd /usr/apache-tomcat-7.0.42/lib && { ln -s -f libtcnative- 1.so.0.1.27 libtcnative-1.so.0 || { rm -f libtcnative-1.so.0 && ln -s libtcnative- 1.so.0.1.27 libtcnative-1.so.0; }; }) libtool: install: (cd /usr/apache-tomcat-7.0.42/lib && { ln -s -f libtcnative- 1.so.0.1.27 libtcnative-1.so || { rm -f libtcnative-1.so && ln -s libtcnative-1.so.0.1.27 libtcnative-1.so; }; }) libtool: install: /usr/bin/install -c -m 755 .libs/libtcnative-1.lai /usr/apache-tomcat- 7.0.42/lib/libtcnative-1.la libtool: install: /usr/bin/install -c -m 755 .libs/libtcnative-1.a /usr/apache-tomcat- 7.0.42/lib/libtcnative-1.a libtool: install: chmod 644 /usr/apache-tomcat-7.0.42/lib/libtcnative-1.a libtool: install: ranlib /usr/apache-tomcat-7.0.42/lib/libtcnative-1.a libtool: install: warning: remember to run `libtool --finish /usr/local/apr/lib' It seems everything is fine, but the error is not self-explanatory Could you guys help to understand where my error is? What am I missing? Thanks in advance for your support.

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  • Intranet Video-streaming

    - by Jonathan Sampson
    What's a good option for home-video-streaming. For example, somebody may use a laptop webcam to stream their baby's crib allowing them to monitor it from the main home PC. In this case, I wouldn't want to do it across the wire with skype, but instead keep it on my local network. What options exist to make this easy to achieve?

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  • Launch script on login to RDS - server side

    - by Jonathan
    I have a logon script that I want to be run when users login to remote desktop on my WinServer2008r2 box. I know I can do this client-side (in the RemoteDesktopClient "Run Program" options) but would rather it be enforced server-side. If I assign the logon script to a GPO, the script will be run whenever the user logs into their local PC. I would like to assign the logon script to the Remote Desktop Users group, but only when they're logging into remote desktop, not when they're logging into their own system. Thoughts?

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  • "Must-Have" Firefox Addons?

    - by Jonathan Sampson
    Only one addon per answer, please. What are some of the best addons when it comes to Firefox? My current favorites include: Firebug Firebug integrates with Firefox to put a wealth of web development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page. Greasemonkey Allows you to customize the way a webpage displays using small bits of JavaScript. What am I missing?

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  • Lightweight IRC Client

    - by Jonathan Sampson
    What is a good option for somebody who wants to participate in IRC, but doesn't want to download a large application, register with any group, etc? Preferably something lite, having a nice feature-set, and easy to get up-and-running. I'm on Windows, and I'd prefer something very easy and non-esoteric to work with.

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  • Windows Server 2008 CMD Task Schedule not running

    - by Jonathan Platovsky
    I have a BAT/CMD file that when run from the command prompt runs completely. When I run it through the Task Scheduler it partially runs. Here is a copy of the file cd\sqlbackup ren Apps_Backup*.* Apps.Bak ren Apps_Was_Backup*.* Apps_Was.Bak xcopy /Y c:\sqlbackup\*.bak c:\sqlbackup\11\*.bak xcopy /y c:\sqlbackup\*.bak \\igweb01\c$\sqlbackup\*.bak Move /y c:\sqlbackup\*.bak "\\igsrv01\d$\sql backup\" The last two lines do not run when the task scheduler calls it. But again, work when manually run from the command line. All the local sever commands run but when it comes to the last two lines where it goes to another server then it does not work.

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  • Get a user's current IP address from Skype

    - by Jonathan.
    This is assuming that you (/police/ISP) can get the [rough] location of a laptop based on IP address. If your laptop is stolen, and the thief unwittingly connects it to the Internet, and you have Skype on the laptop could you get the public IP address of the laptop and then go to the police and get it tracked? Or activate the webcam to see the surroundings, but without having Skype ring/notify the user?

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  • Only show windows 7 Preview Pane (in explorer) when the file has a preview

    - by Jonathan
    I use the preview pane often, especially with pdfs. But when selecting folders or files which don't have previews, or not even selecting anything, the preview pane stays, it's quite big, and I use lots when I have the explorer window maximised on my 1920x1080 monitor in this case it takes up about half my screen, but when I use explorer in a smaller window the preview pane shrinks the cneter folder pane and stays half the size of the window. Is there anyway to only show the preview pane when the file has a preview and then hide it again when the file doesn't or not file is selected. (btw, please don't say about alternate file browsers, as they all look ugly and complicated)

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  • Make headphone output mono.

    - by Jonathan
    my headphones are stereo but I would like the sound from the left and right to be combined then sent to both headphones. The reason is I'm watching a video where the people speaking are in the right ear as well as the music but they never speak in the left ear (it is not because they on the right side of the screen) If I take the right headphone off then I only hear the music in my left and there is no speaking.

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  • Windows Explorer keeps crashing in Windows 8.1

    - by Jonathan Allen
    This started a few days ago on a machine that has been running WIn 8.1 for over a month. I just finished a clean install of Windows 8.1 with a handful of apps like Dropbox and Office. Yet I'm still getting Windows Explorer crashes such as this: Faulting application name: Explorer.EXE, version: 6.3.9600.16408, time stamp: 0x523d251b Faulting module name: SHELL32.dll, version: 6.3.9600.16409, time stamp: 0x523fac81 Exception code: 0xc00000fd Fault offset: 0x0000000000189247 Faulting process id: 0xee8 Faulting application start time: 0x01ced2a62f6e5b2e Faulting application path: C:\WINDOWS\Explorer.EXE Faulting module path: C:\WINDOWS\system32\SHELL32.dll Report Id: e25c6b13-3eb4-11e3-be7a-2cd05a597b87 Faulting package full name: Faulting package-relative application ID: I assume that it is some sort of shell extension, but I don't know how to figure out which one.

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  • DFS share Access denied for some time after workstation is booted.

    - by Jonathan
    I have 2 Win server 2008 servers acting as domain controllers and Dns servers doing DFS. All my workstations are windows xp sp3. I have a DFS share drive mapped at login via login script. After the pc is booted I get an access denied message when trying to access the mapped drive. If i go to the file share on one of the servers i can get to it fine. After about 10 minutes i can try to access the mapped drive again and it works fine. I am not sure if it is some delay happening in dfs name resolution or a gpo issue.

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  • How to chroot Apache on CentOS?

    - by Jonathan Meyer
    I have been advised by a sysadmin, to run Apache in a chroot jail, in order to prevent that an attacker could take control of server. So my question is: What is the best method to chroot Apache/2.2.3 in RHEL/CentOS 5?, i only use the default modules that comes with Apache like mod_php and also mod_security. I heard of mod_security SecChrootDir but i don't know if it would be suitable for my config, it says that it's recommended only for static file serving in the documentation. Thank you!

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