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  • Hidden Features of Grails

    - by knorv
    Inspired by the question series "Hidden features of ..", I am curious to hear about your favorite Grails tips or lesser known but useful features you know of. Rules: One feature per answer Give an example and short description of the feature, not just a link to documentation Label the feature using bold title as the first line

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  • Access static class variable of parent class in Python

    - by fuenfundachtzig
    I have someting like this class A: __a = 0 def __init__(self): A.__a = A.__a + 1 def a(self): return A.__a class B(A): def __init__(self): # how can I access / modify A.__a here? A.__a = A.__a + 1 # does not work def a(self): return A.__a Can I access the __astatic variable in B? It's possible writing a instead of __a, is this the only way? (I guess the answer might be rather short: yes :)

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  • How do i know what unixtime a php session will expire?

    - by Steve
    Hi How do I know how many seconds it will be until a php session expires? I'm building a web application where users might spend a lot of time typing into big text fields, but for security reasons I still want sessions to time out after a reasonably short period. I want to warn them if their session is about to expire so they can save or take some other action to keep it alive. Any tips? thanks!

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  • Lightbox close and loading images not showing

    - by Mark Szymanski
    I am using Lightbox 2 and I have followed the short tutorial on how to insert it in a webpage and it works perfectly but the close and refresh images don't show. They are replaced with the classic Mac OS X '?' box. I have checked the paths of these images in the lightbox.js file and they are correct. Thanks in advance!

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  • How a thread should close itself in Java?

    - by Roman
    This is a short question. At some point my thread understand that it should suicide. What is the best way to do it: Thread.currentThread().interrupt(); return; By the way, why in the first case we need to use currentThread? Is Thread does not refer to the current thread?

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  • Play sound when UIScrollView is scrolling

    - by Chonch
    Hey, I have a scroll view that can be scrolled to the sides (only left and right, not up and down). I want to play a short sound (less than a second) whenever the scroll view is moved X pixels to either side. How can this be done? Code samples will be greatly appreciated... Thanks,

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  • Image storage as a service

    - by Samuel
    Google App Engine provides a image API for storing / retrieving images. We are currently not in a position to deploy our application on top of App Engine because of limitations in the java frameworks (jboss seam 2.2.0) we are using to build our j2ee application. We would eventually want to deploy our production application on top of Google App Engine, but what are the short term options (java based open source products) which provides comparable functionality to Google App Engine's Image API and will have an easier migration path at a later point in time.

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  • Is the recent trend toward widescreen (16:9) computer monitors a plus or minus for programmers?

    - by DanM
    It's almost gotten to the point where you can't buy a conventional (4:3) monitor anymore. Pretty much everything is widescreen. This is fine for watching movies or TV, but is it good or bad for programming? My initial thoughts on the issue are that widescreens are a net negative for programmers. Here are some of the disadvantages I see: Poor space utiliziation One disadvantage of widescreens you can't argue with is that they offer poor space utilization for the amount of total pixels you get. For example, my Thinkpad, which I bought just before the widescreen craze, has a 15" monitor with a native resolution of 1600 x 1200. The newer 15.4" Thinkpads run at most 1680 x 1050. So (if you do the math) you get fewer pixels in a wider (but not shorter) package. With desktop monitors, you pay a price in terms of desk space used. Two 1680 x 1050 monitors will simply take up more of your desk than two 1600 x 1200 monitors (assuming equal dot pitch). More scrolling If you compare a 1680 x 1050 monitor to a 1600 x 1200 monitor, you get 80 extra pixels of width but 150 fewer pixels of height. The height reduction means you lose approximately 11 lines of code. That's less you can see on the screen at one time and more scrolling you have to do. This harms productivity, maybe not dramatically, but insidiously. Less room for wide panels Widescreens also mean you lose space for wide but short panels common in programming environments. If you use Visual Studio, for example, your code window will be that much shorter when viewing the Find Results, Task List, or Error List (all of which I use frequently). This isn't to say the 80 pixels of extra width you get with widescreen would never be useful, but I tend to keep my lines of code short, so seeing more lines would be more valuable to me than seeing fewer, longer lines. What do you think? Do you agree/disagree? Are you now using one or more widescreen monitors for development? What resolution are you running on each? Do you ever miss the height of the traditional 4:3 monitor? Would you complain if your monitors were one inch narrower but two inches taller?

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  • Recommended reading for bioinformatics

    - by Matt
    I'm keen on learning about bioinformatics. I am ideally looking for a short course introduction, with some practical tasks I can get my teeth into immediately to see if there is any interest in it for me. I already have a good understanding of molecular biology, so I should be able to skip most of the foundational work. Any suggestions?

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  • How does Lucene work

    - by Midhat
    I am trying to find out how lucene search works so fast. Cant find any useful docs on the web. If you have anything (short of lucene source code) to read, let me know. A text search query using mysql5 text search with index takes about 18 minutes in my case. A lucene search for the same query takes less than a second

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  • secure xmlhttprequest from nonsecure page

    - by amwinter
    I want to make an XMLHttpRequest to a secure uri (https://site.com/ajaxservice/) from javascript running inside a nonsecure page (http://site.com/page.htm). I've tried all kinds of nutty stuff like iframes and dynamic script elements, so far no go. I know I am violating 'same origin policy' but there must be some way to make this work. I will take any kind of wacky solution short of having the SSL protocol written in javascript.

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  • xerces-c: Xml parsing multiple files

    - by user459811
    I'm atempting to learn xerces-c and was following this tutorial online. http://www.yolinux.com/TUTORIALS/XML-Xerces-C.html I was able to get the tutorial to compile and run through a memory checker (valgrind) with no problems however when I made alterations to the program slightly, the memory checker returned some potential leak bytes. I only added a few extra lines to main to allow the program to read two files instead of one. int main() { string configFile="sample.xml"; // stat file. Get ambigious segfault otherwise. GetConfig appConfig; appConfig.readConfigFile(configFile); cout << "Application option A=" << appConfig.getOptionA() << endl; cout << "Application option B=" << appConfig.getOptionB() << endl; // Added code configFile = "sample1.xml"; appConfig.readConfigFile(configFile); cout << "Application option A=" << appConfig.getOptionA() << endl; cout << "Application option B=" << appConfig.getOptionB() << endl; return 0; } I was wondering why is it when I added the extra lines of code to read in another xml file, it would result in the following output? ==776== Using Valgrind-3.6.0 and LibVEX; rerun with -h for copyright info ==776== Command: ./a.out ==776== Application option A=10 Application option B=24 Application option A=30 Application option B=40 ==776== ==776== HEAP SUMMARY: ==776== in use at exit: 6 bytes in 2 blocks ==776== total heap usage: 4,031 allocs, 4,029 frees, 1,092,045 bytes allocated ==776== ==776== 3 bytes in 1 blocks are definitely lost in loss record 1 of 2 ==776== at 0x4C28B8C: operator new(unsigned long) (vg_replace_malloc.c:261) ==776== by 0x5225E9B: xercesc_3_1::MemoryManagerImpl::allocate(unsigned long) (MemoryManagerImpl.cpp:40) ==776== by 0x53006C8: xercesc_3_1::IconvGNULCPTranscoder::transcode(unsigned short const*, xercesc_3_1::MemoryManager*) (IconvGNUTransService.cpp:751) ==776== by 0x4038E7: GetConfig::readConfigFile(std::string&) (in /home/bonniehan/workspace/test/a.out) ==776== by 0x403B13: main (in /home/bonniehan/workspace/test/a.out) ==776== ==776== 3 bytes in 1 blocks are definitely lost in loss record 2 of 2 ==776== at 0x4C28B8C: operator new(unsigned long) (vg_replace_malloc.c:261) ==776== by 0x5225E9B: xercesc_3_1::MemoryManagerImpl::allocate(unsigned long) (MemoryManagerImpl.cpp:40) ==776== by 0x53006C8: xercesc_3_1::IconvGNULCPTranscoder::transcode(unsigned short const*, xercesc_3_1::MemoryManager*) (IconvGNUTransService.cpp:751) ==776== by 0x40393F: GetConfig::readConfigFile(std::string&) (in /home/bonniehan/workspace/test/a.out) ==776== by 0x403B13: main (in /home/bonniehan/workspace/test/a.out) ==776== ==776== LEAK SUMMARY: ==776== definitely lost: 6 bytes in 2 blocks ==776== indirectly lost: 0 bytes in 0 blocks ==776== possibly lost: 0 bytes in 0 blocks ==776== still reachable: 0 bytes in 0 blocks ==776== suppressed: 0 bytes in 0 blocks ==776== ==776== For counts of detected and suppressed errors, rerun with: -v ==776== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 2 from 2)

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  • What solution programmers prefer to get ride of Myopia?

    - by Emily
    Yes, i have Myopia and that's really annoying and make me blame myself why i choosen this field. And i think a lot of people like me here. What did you choose/Or the best choice in order to correct your short-sight? Glasses Contacts Overnight Contacts Lasik I'm really confused because some people say glasses are decreasing the sight more, other say Lasik is just a luck, others prefer overnight contacts which you sleep with'em.

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  • Find slow/ineffecient method calls in dotnet

    - by Matt Thrower
    Hi, I'm faced with a big old stack of method calls in some legacy code, one or some of which is creating a bottleneck and really slowing things down. Is there any quick way I can get a report on which method calls are taking the time, short of running in debug, stepping through and seeing where the cursor pauses?

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  • Tomcat: Cache-Control

    - by Itay
    Jetty has a CacheControl parameter (can be specified webdefault.xml) that determines the caching behavior of clients (by affecting headers sent to clients). Does Tomcat has a similar option? In short, I want to turn off caching of all pages delivered by a tomcat server and/or by a specific webapp?

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  • How do I list Clearcase versions without the Fully-qualified verison?

    - by Luciano
    In Clearcase: I'm trying to find the names of all files in the current view without a specific label. So far I've come up with the following: cleartool find -cview -all -version '\!lbtype(LABEL_1)' -print But this ends up displaying the filenames with the "@@/main/BRANCH1/SUBBRANCH" appended to the end, and I really want just the filename. I've tried adding a -short, but the find command doesn't like that option, and I can't find an option in the manuals to change the behavior.

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  • stop ReconnectingClientFactory (XmlStreamFactory)

    - by defreng
    Hey guys, I tried to write a XMPP Client using this mentioned factories. Now my program only needs this connection during a short time. How can I make the Factory to stop reconnection attempts? Unfortunately stopTrying doesn't work. Do I have to disconnect running connections before? Any help would be appreciated :)

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