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  • How to create a windows service from java app

    - by ideasculptor
    I've just inherited a java application that needs to be installed as a service on XP and vista. It's been about 8 years since I've used windows in any form and I've never had to create a service, let alone from something like a java app (I've got a jar for the app and a single dependency jar - log4j). What is the magic necessary to make this run as a service? I've got the source, so code modifications, though preferably avoided, are possible.

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  • MySQL - Calculating fields on the fly vs storing calculated data

    - by Christian Varga
    Hi Everyone, I apologise if this has been asked before, but I can't seem to find an answer to a question that I have about calculating on the fly vs storing fields in a database. I read a few articles that suggested it was preferable to calculate when you can, but I would just like to know if that still applies to the following 2 examples. Example 1. Say you are storing data relating to a car. You store the fuel tank size in litres, and how many litres it uses per 100km. You also want to know how many KMs it can travel, which can be calculated from the tank size and economy. I see 2 ways of doing this: When a car is added or updated, calculate the amount of KMs and store this as a static field in the database. Every time a car is accessed, calculate the amount of KMs on the fly. Because the cars economy/tank size doesn't change (although it could be edited), the KMs is a pretty static value. I don't see why we would calculate it every single time the car is accessed. Wouldn't this waste cpu time as opposed to simply storing it in a separate field in the database and calculating only when a car is added or updated? My next example, which is almost an entirely different question (but on the same topic), relates to counting children. Let's say we have a app which has categories and items. We have a view where we display all the categories, and a count of all the items inside each category. Again, I'm wondering what's better. To perform a MySQL query to count all the items in each category every single time the page is accessed? Or store the count in a field in the categories table and update when an item is added / deleted? I know it is redundant to store anything that can be calculated, but I worry that calculating fields or counting records might be slow as opposed to storing the data in a field. If it's not then please let me know, I just want to learn about when to use either method. On a small scale I guess it wouldn't matter either way, but apps like Facebook, would they really count the amount of friends you have every time someone views your profile or would they just store it as a field? I'd appreciate any responses to both of these scenarios, and any resource that might explain the benefits of calculating vs storing. Thanks in advance, Christian

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  • rails multiple outer joins syntax

    - by Craig McGuff
    I have the following models user has_many :leave_balances leave_balance belongs_to :user belongs_to :leave_type leave_type has_many :leave_balances I want to output a table format showing user names and their balance by leave type. Not every user can have every balance i.e. outer joins required. I'd like to see something like this: Employee Annual Leave Sick Leave Bob 10 Fred 9 Sara 12 15 I am unsure how to get this out as a single statement? I am thinking something like User.joins(:leave_balances).joins(:leave_type)

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  • Filename of script that instantiates an object

    - by Calvin L
    In PHP, is it possible to get the file name of the script that instantiated an object? For example I have a script called file.php that creates a new instance of class Class. The class has an Error object that, when triggered, returns some error information. I would like to show that file.php triggered the error.

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  • Binding JBoss to IP Address

    - by Anand
    Hi, I am running a JBoss instance on a linux server I am using the ./run.sh -b This is not working what could be the reason. I am unable to share the error message details as of now will post it when I can, till then any alternatives or solutions ?

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  • How can I generate a git diff of what's changed since the last time I pulled?

    - by Teflon Ted
    I'd like to script, preferably in rake, the following actions into a single command: Get the version of my local git repository. Git pull the latest code. Git diff from the version I extracted in step #1 to what is now in my local repository. In other words, I want to get the latest code form the central repository and immediately generate a diff of what's changed since the last time I pulled.

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  • mysql procedure to update numeric reference in previous rows when one is updated

    - by markcial
    There's a table like this one ______________________ | id | title | order | |----------------------| | 1 | test1 | 1 | |-----|--------|-------| | 2 | test2 | 2 | |-----|--------|-------| | 3 | test3 | 3 | |-----|--------|-------| | 4 | test4 | 4 | '----------------------' when i introduce in my mysql shell a single update to a row $sql UPDATE `table` SET order=1 WHERE id=3; And then procedure or method resamples order column in the before update lower values to get its order renewed like this ______________________ | id | title | order | |----------------------| | 1 | test1 | 2 | |-----|--------|-------| | 2 | test2 | 3 | |-----|--------|-------| | 3 | test3 | 1 | |-----|--------|-------| | 4 | test4 | 4 | '----------------------' Any help would be appreciated, thanks!

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  • How to specify number of headers in section UITableView.

    - by Mr. McPepperNuts
    if ([tempArray containsObject: [sectionInfo indexTitle]]) { return nil; }else { [tempArray addObject: [sectionInfo indexTitle]]; return [sectionInfo indexTitle]; } return [sectionInfo indexTitle]; The code above groups the cells in alphabetical order but displays a blank header instead of the appropriate title. Could this possibly be because I did not specify the number of headers? This would naturally be a single header for every letter in the alphabet.

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  • Weirdest occurrence ever, UIButton @selector detecting right button, doing wrong 'else_if'?

    - by Scott
    So I dynamically create 3 UIButtons (for now), with this loop: NSMutableArray *sites = [[NSMutableArray alloc] init]; NSString *one = @"Constution Center"; NSString *two = @"Franklin Court"; NSString *three = @"Presidents House"; [sites addObject: one]; [one release]; [sites addObject: two]; [two release]; [sites addObject: three]; [three release]; NSString *element; int j = 0; for (element in sites) { UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; //setframe (where on screen) //separation is 15px past the width (45-30) button.frame = CGRectMake(a, b + (j*45), c, d); [button setTitle:element forState:UIControlStateNormal]; button.backgroundColor = [SiteOneController myColor1]; [button addTarget:self action:@selector(showCCView:) forControlEvents:UIControlEventTouchUpInside]; [button setTag:j]; [self.view addSubview: button]; j++; } The @Selector method is here: - (void) showCCView:(id) sender { UIButton *button = (UIButton *)sender; int whichButton = button.tag; NSString* myNewString = [NSString stringWithFormat:@"%d", whichButton]; self.view = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]]; self.view.backgroundColor = [UIColor whiteColor]; UINavigationBar *cc = [SiteOneController myNavBar1:@"Constitution Center Content"]; UINavigationBar *fc = [SiteOneController myNavBar1:@"Franklin Court Content"]; UINavigationBar *ph = [SiteOneController myNavBar1:@"Presidents House Content"]; if (whichButton = 0) { NSLog(myNewString); [self.view addSubview:cc]; } else if (whichButton = 1) { NSLog(myNewString); [self.view addSubview:fc]; } else if (whichButton = 2) { NSLog(myNewString); [self.view addSubview:ph]; } } Now, it is printing the correct button tag to NSLog, as shown in the method, however EVERY SINGLE BUTTON is displaying a navigation bar with "Franklin Court" as the title, EVERY SINGLE ONE, even though when I click button 0, it says "Button 0 clicked" in the console, but still performs the else if (whichButton = 1) code. Am I missing something here?

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  • Add rel="xx" to jQuery a.link elements

    - by Xavier
    I use a little jQuery script to run a simple music player, but I'd like to add a rel="player" to the links in this jQuery script (the play/stop button for instance). This way I can exclude these rel="player" links from another jQuery script I use, because I don't want it to take the rel="player" elements into account. I reckon this is fair simple but i don't really know how to to it. Here is the jQuery script of the player, if it's ever necessary: http://hyker.be/cv/js/jquery.simpleplayer.min.js

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  • Need Help About Using XPathNavigator in C#?

    - by Nano HE
    Hello. My XML file as below. It mixed schema and normal elements. <?xml version="1.0" encoding="utf-8"?> <!-- R1 --> <ax:root xmlns:ax="http://amecn/software/realtime/ax"> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <xsd:element name="EquipmentConstants"> <xsd:complexType> <xsd:sequence> <xsd:element minOccurs="0" maxOccurs="unbounded" ref="EquipmentConstant" /> </xsd:sequence> </xsd:complexType> <xsd:unique name="id"> <xsd:selector xpath=".//EquipmentConstant" /> <xsd:field xpath="@id" /> </xsd:unique> </xsd:element> ...... ...... </xsd:schema> <EquipmentConstants xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <EquipmentConstant id="0"> <Name>SerialNumber</Name> <Group>SYSTEM</Group> <Data> <Value min="0" max="10000000" scale_factor="0" unit="U_NO_UNITS" permission="NolimitedAndNoChangeable" type="xsd_string" enum="" flag="0">0</Value> </Data> <Description>Serial Number</Description> </EquipmentConstant> ..... ..... </EquipmentConstants> </ax:root> My C# code as below. I want to loop the elements from <EquipmentConstants xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> XPathDocument doc = new XPathDocument("test.xml"); XPathNavigator navigator = doc.CreateNavigator(); navigator.MoveToRoot(); // <?xml version="1.0" encoding="utf-8"?> //navigator.MoveToFirstChild(); // <!-- R1 --> // 1st, I tried to use MoveToChield(), But I failed to move there. navigator.MoveToChild("EquipmentConstants"); // Then, I also tried to use SelectSingleNode(). But I failed too. navigator.SelectSingleNode("ax/EquipmentConstants"); while (navigator.MoveToNext()) { // do something. } Could you please give me some suggestion. Thank you.

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  • runModalForWindow throttles http requests

    - by Nikita Rybak
    I have url connection, which normally works fine NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:delegate]; But when I create a modal window, no request ever receives response: [NSApp runModalForWindow:window]; If I comment this line out, thus creating a 'standard' window, everything works. I tried implementing all methods from NSURLConnectionDelegate, not a single of them called. I suspect this is something about 'run loops', but have little experience in this area. Does anybody have experience in this? Thank you

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  • easy, straightforward way to package a python program for debian?

    - by Jeremiah Rose
    i'm having trouble navigating the maze of distribution tools for python and debian; cdbs, debhelper, python-support, python-central, blah blah blah .. my application is a fairly straightforward one - a single python package (directory containing modules and a __init__.py), a script for running the program (script.py) and some icons and menu items (.desktop files). is there a simple straightforward way to make a .deb file out of these, or should i brave the nonsensical tools listed above?

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  • Tomcat Load Balalncing - Programatic Parameter Based ??

    - by Gala101
    Here's the scenario: Many users access an application (running on tomcat), the user's data is segmented into multiple databases, say each db containing 1000 user's data. Now is it somehow possible to have 100s of tomcat servers running on 'inexpensive' PC class machines with each connecting to a single db, with user's session getting passed to appropriate tomcat and becoming 'Sticky' there. Can have some sort of 'gateway' deciding which user goes where and doing the load-balancing appropriately. Would make a great scalability solution :)

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  • Change window title to the one in text box in Objective-C?

    - by Nick Brooks
    I'm just getting started with Objective-C and I'm writing a simple application. I made two outlets : wnd - main window display - the text box Then I've tried using this code: [wnd setTitle:[display value]]; Unfortuanately it didn't work ... The debugger said : 2010-05-22 XX:XX:08.577 HelloWorld[2536:a0f] -[NSTextField value]: unrecognized selector sent to instance 0x102e032a0 Does anyone know how to get it to work?

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  • Different ways of accessing configuration parameters from a JAX-WS service

    - by ecerulm
    As far as I know I can access the web.xml <context-param>s by making my class implement ServletContextListener and use the ServletContext.getInitParam(String) to read them, but it´s cumbersome as only one instance of the class will receive the contextInitialized(ServletContextEvent sce) call, so I need to make the ServletContext an static member of the class. What other ways exist of setting conf params at deployment time and what are the recommended ones?

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