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Articles indexed Wednesday March 31 2010

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  • How to see active connections and "current activity" in PostgreSQL 8.4

    - by Evgeny
    I'm investigating an issue with DB connections being left open indefinitely, causing problems on the DB server. How do I see currently open connections to a PostgreSQL server, particularly those using a specific database? Ideally I'd like to see what command is executing there as well. Basically, I'm looking for something equivalent to the "Current Activity" view in MSSQL.

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  • Exposing python api over the network for an iphone application

    - by MAC
    I have functionality built in python on a central server. I wish to expose this api over the network to an iphone application. What would be the best way to do that? Is it possible to create web services in python and have the iphone app use those? If so could anyone give me pointers as to how to create web services in python. If someone has a better idea on how to go about doing this let me know =)

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  • Why does the rename() syscall prohibit moving a directory that I can't write to a different director

    - by Daniel Papasian
    I am trying to understand why this design decision was made with the rename() syscall in 4.2BSD. There's nothing I'm trying to solve here, just understand the rationale for the behavior itself. 4.2BSD saw the introduction of the rename() syscall for the purpose of allowing atomic renames/moves of files. From 4.3BSD-Reno/src/sys/ufs/ufs_vnops.c: /* * If ".." must be changed (ie the directory gets a new * parent) then the source directory must not be in the * directory heirarchy above the target, as this would * orphan everything below the source directory. Also * the user must have write permission in the source so * as to be able to change "..". We must repeat the call * to namei, as the parent directory is unlocked by the * call to checkpath(). */ if (oldparent != dp->i_number) newparent = dp->i_number; if (doingdirectory && newparent) { VOP_LOCK(fndp->ni_vp); error = ufs_access(fndp->ni_vp, VWRITE, tndp->ni_cred); VOP_UNLOCK(fndp->ni_vp); So clearly this check was added intentionally. My question is - why? Is this behavior supposed to be intuitive? The effect of this is that one cannot move a directory (located in a directory that one can write) that one cannot write to another directory that one can write to atomically. You can, however, create a new directory, move the links over (assuming one has read access to the directory), and then remove one's write bit on the directory. You just can't do so atomically. % cd /tmp % mkdir stackoverflow-question % cd stackoverflow-question % mkdir directory-1 % mkdir directory-2 % mkdir directory-1/directory-i-cant-write % echo "foo" > directory-1/directory-i-cant-write/contents % chmod 000 directory-1/directory-i-cant-write/contents % chmod 000 directory-1/directory-i-cant-write % mv directory-1/directory-i-cant-write directory-2 mv: rename directory-1/directory-i-cant-write to directory-2/directory-i-cant-write: Permission denied We now have a directory I can't write with contents I can't read that I can't move atomically. I can, however, achieve the same effect non-atomically by changing permissions, making the new directory, using ln to create the new links, and changing permissions. (Left as an exercise to the reader) . and .. are special cased already, so I don't particularly buy that it is intuitive that if I can't write a directory I can't "change .." which is what the source suggests. Is there any reason for this besides it being the perceived correct behavior by the author of the code? Is there anything bad that can happen if we let people atomically move directories (that they can't write) between directories that they can write?

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  • Google Maps API with Rails 3.0

    - by JZ
    I'm wondering if anyone out there has worked with Google Maps API with Rails 3. I'm looking for launching ideas, gems, plugins etc. I played around with ym4r-gm plugin for several hours today, with not much luck. Have you played with this API on rails 3 yet? Thanks in advance!

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  • blackberry versus iphone development

    - by Blankman
    For those of you who know/experienced both blackberry and iphone development, which platform did you prefer and why? I'm looking for things like debugging ability, api stability, UI development, deployment, IDE, documentations etc.

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  • Programming Related Songs

    - by Jim McKeeth
    One song per answer please! We have discussed music you listen to while coding, but I looking for music related to coding and coders. It can be eclectic or mainstream, and even a bit of a stretch (just explain the connection). Vote for your favorite song or add it if it isn't already here. Link to lyrics, band, music, video, etc., when possible.

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  • How can I force maven to use my mock version of dependencies during the test phase.

    - by Jayd16
    Hi, so I have a Java application with a that accesses some web services. I want to mock out the appropriate classes so I can just use a few hard coded request/responses and I want maven to seamlessly use them during the tests and ignore them during the final build. I want maven2 to: 1)compile my mock classes 2)compile the main classes that depend on the mocked code 3)run tests 4)recompile any main classes with the real dependencies, not my mocks 5)finish up the maven install Ideally I want to just name my mock classes the same as my main class and just keep them in src/test/mocks or something. I'm kind of new to maven and so far it looks like maven will only compile the src/main and then src/test but I'm hoping I can have my way. Any ideas?

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  • How do I change the default format of log messages in python app engine?

    - by dazed-n-confused
    I would like to log the module and classname by default in log messages from my request handlers. The usual way to do this seems to be to set a custom format string by calling logging.basicConfig, but this can only be called once and has already been called by the time my code runs. Another method is to create a new log Handler which can be passed a new log Formatter, but this doesn't seem right as I want to use the existing log handler that App Engine has installed. What is the right way to have extra information added to all log messages in python App Engine, but otherwise use the existing log format and sink?

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  • QT: custom widget in QScrollArea

    - by slimscsi
    I am attempting to create a custom widget. My Widget renders itself unless it is inside a scroll area. The code below works. If I change the if(0) to an if(1) inside the MainWindow constructor, it will not render the "Hello World" string. I assume that I must (re)implement some additional methods, but so far I have not been able to find the correct ones with trial and error. // hellowidget.h #ifndef HELLOWIDGET_H #define HELLOWIDGET_H #include <QtGui> class HelloWidget : public QWidget { Q_OBJECT public: HelloWidget(QWidget *parent = 0); void paintEvent(QPaintEvent *event); }; #endif // HELLOWIDGET_H // hellowidget.cpp #include "hellowidget.h" HelloWidget::HelloWidget(QWidget *parent) : QWidget(parent) { } void HelloWidget::paintEvent(QPaintEvent *event) { QPainter painter(this); painter.drawText(rect(), Qt::AlignCenter, "Hello World"); } // mainwindow.h #ifndef MAINWINDOW_H #define MAINWINDOW_H #include <QtGui> class MainWindow : public QMainWindow { Q_OBJECT public: MainWindow(QWidget *parent = 0); ~MainWindow(); private: }; #endif // MAINWINDOW_H // mainwindow.cpp #include "mainwindow.h" #include "hellowidget.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) { HelloWidget *hello = new HelloWidget; QWidget *central = hello; if( 0 ) { QScrollArea *scroll = new QScrollArea ; scroll->setWidget(hello); central = scroll; } setCentralWidget( central ); } MainWindow::~MainWindow() { } // main.cpp #include <QtGui/QApplication> #include "mainwindow.h" int main(int argc, char *argv[]) { QApplication a(argc, argv); MainWindow w; w.show(); return a.exec(); }

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  • Data Import in SQL Server Express

    - by bobsmith123
    SQL Server Express does not have the Tasks - Import Data option that other editions of SQL Server has. Has anyone come across a free tool to import data? I understand I can use the bulk import but I have run into a security issue with it and would like a quick and a dirty way of importing a csv file to a sql express table.

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  • Maintain order of messages via proxies to app servers

    - by David Turner
    Hi, I am receiving messages from a 3rd party via a http post, and it is important that the order the messages hit our infrastructure is maintained through the load balancers and proxies until it hits our application server. Quick Diagram. (proxies in place due to security requirements.) [ACE load balancer] - [2 proxies] - [Application Servers] or maybe [ACE load balancer] - [2 proxies] - [ACE load balancer] - [Application Servers] My idea was that I would setup the load balancers in active-passive mode, to force all messages to use one proxy, and then both the proxies would hit a second load balancer that would be configured in active passive to hit one application server. Whilst the above is not ideal, it does give me resilience, and once the message is in my app servers, I enter a stateless world, and load balance across both nodes of my cluster. However, I am concerned that even a single proxy could send messages out of order, perhaps if 2 messages are recived very close together, message 2 might get processed faster than message 1. Is this possible? Likely? Is there a simple open source proxy (MOD_PROXY?) that can be easily configured to just pass messages through it, and to guarantee to send the messages through in the order they are received. If so which, and finally links to how I should configure it would be great. In fact any links to articles around avoiding "out of order" messages using hardware would be gratefully received. Thanks, ps for those that are interested, the app is a java spring integration application currently on a appliation server.

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  • Problem in using svn and buildix

    - by jani
    Hi all I ran into a problem in using svn and buildix. I have a project created in svn as well as in cruise control which was working fine. Since yesterday whenever I commit changes into svn they are successfully commited but buildix is not able to pick up those changes, Normally I used to run 'svn update' whenever this problem occurs but now this is not helping for this project. When I try to run 'svn update', I get Skipped '.' and when I try to run 'svn cleanup', I get svn: '.' is not a working copy directory I took the advice of some one and deleted the folder .svn in my project but that did not help. Any help, thanks in advance. Regards, Jani

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  • Problem in using xpath with xslt having distinct values

    - by AB
    I have XML like, <items> <item> <products> <product>laptop</product> <product>charger</product> <product>Cam</product> </products> </item> <item> <products> <product>laptop</product> <product>headphones</product> <product>Photoframe</product> </products> </item> <item> <products> <product>laptop</product> <product>charger</product> <product>Battery</product> </products> </item> </items> and I am using xslt on it //can't change xpath as getting it from somewhere else <xsl:param name="xparameter" select="items/item[products/product='laptop' and products/product='charger']"></xsl:param> <xsl:template match="/"> <xsl:for-each select="$xparameter"> <xsl:for-each select="products/product[not(.=preceding::product)]"> <xsl:sort select="."></xsl:sort> <xsl:value-of select="." ></xsl:value-of>, </xsl:for-each> </xsl:for-each> </xsl:template> I want the output to be laptop charger cam Battery But I m not getting the result as I m expecting...distinct values is working fine ..something is getting wrong when I am adding that and claus

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  • Why can't my master page be loaded

    - by Irwin
    I've largely ignored this error, but i can do so no more. I'm trying to view a page that inherits from a master page in my solution, but I see this: "The Master Page file 'Site.master' cannot be loaded." The page exists, I can browse to it, view it in design view and do stuff. When the site is loaded in the browser, it works fine. Any ideas?

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  • perl: tk: a way/widget that allows pixel level control over the output

    - by chhh
    I want something like a canvas, but where i'd be able to manipulate pixels easily in addition to all the provided geometries, that can be drawn on canvas. Is it possible to embed something like GD::Image into a canvas? So then I maybe could make the image transparent and set some pixels in it (GD::Image-setPixel()) positioning it over the canvas? ps: well, that doesn't necessarily have to be perl, as there seem to be bindings for all the libs for most scripting (and not only) languages.

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  • Setting up a view to draw to in Objective-C (iPhone) ?

    - by Johannes Jensen
    Okay, so, I'm all new to iPhone and stuff, but I'm not even at programming, I have many years of experience with ActionScript 2.0 and 3.0, I want to set up a view, that I can also pass variables to. The view is gonna draw everything with Quartz. I tried to make another game where I tried to add a pointer to a NSMutableArray to the view class, but it didn't work cause I didn't know how to store an actual class. I wanted to do like: [myView setNeedsDisplay]; but I had to do [(View*)self.view setNeedsDisplay]; didn't really work out in the end... Okay, so now I got: - (void) viewDidLoad { [super viewDidLoad]; viewClass = [[View class] retain]; gameView = [[[viewClass alloc] initWithFrame: CGRectZero] retain]; [gameView setNeedsDisplay]; } This is in my drawInContext:context, which is fired by drawRect: Also, my drawRect does [self drawInContext: UIGraphicsGetCurrentContext()]; CGContextSetStrokeColorWithColor(context, [[UIColor blackColor] CGColor]); CGContextSetLineWidth(context, 3.0); CGContextSetLineCap(context, kCGLineCapRound); CGContextSetLineJoin(context, kCGLineJoinRound); CGMutablePathRef aPath = CGPathCreateMutable(); CGPathMoveToPoint(aPath, nil, 5, 5); CGPathAddLineToPoint(aPath, nil, 45, 43); CGContextAddPath(context, aPath); CGContextStrokePath(context); Nothing happens. Help? Oh yeah, I get this error: : invalid context for each time I use those functions. :[ Thanks!

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  • graphical svn client for creating branches, merging branches etc?

    - by ajsie
    hi i wonder if there are some GUI softwares to administrate a svn repo? or do you actually have to log into the ubuntu server with ssh and use all the svn commands to copy the trunk to a branch, merge the data back and forth, copy to a tag, delete and so on... im using netbeans in mac. i think it's only handling the communication between a local project and the repo. not the flows between trunc, branch and tag (creating, deleting, viewing differences etc)

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  • What's with the unicorns?

    - by Ward
    And don't tell me this is meta and should only be discussed over there. It's happened here, there should be an answer here. I guess that in UTC it's April 1, but it's a huge distraction.

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  • Searching a large list of words in another large list

    - by Christian
    I have a list of 1,000,000 strings with a maximum length of 256 with protein names. Every string has an associated ID. I have another list of 4,000,000,000 strings with a maximum length of 256 with words out of articles and every word has an ID. I want to find all matches between the list of protein names and the list of words of the articles. Which algorithm should I use? Should I use some prebuild API? It would be good if the algorithm runs on a normal PC without special hardware.

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