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  • Experience of moving to 64 bit JVM

    - by Fazal
    Our company is planning to move to 64 bit JVM in order to get away from 2 GB maximum heap size limit. Google gave me very mixed results about 64 bit JVM performance. Has anyone tried moving to 64 bit java and share your experience

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  • Components for creating Archives

    - by John
    Hello, I'm searching for a simple,free component for creating archives with the capability of adding files to an already existing archive.Compressions is not a matter as much as performance so even "store" will be useful. Please help me find one.

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  • Basic principles of computer encryption?

    - by Andrew
    I can see how a cipher can be developed using substitutions and keys, and how those two things can become more and more complex, thus offering some protection from decryption through brute-force approaches. But specifically I'm wondering: what other major concepts beyond substitution and key are involved? is the protection/secrecy of the key a greater vulnerability than the strength of the encryption? why does encryption still hold up when the key is 'public' ? are performance considerations a major obstacle to the development of more secure encryption?

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  • Scalability comparison between different DBMSs

    - by Björn Lindfors
    By what factor does the performance (read queries/sec) increase when a machine is added to a cluster of machines running either: a Bigtable-like database MySQL? Google's research paper on Bigtable suggests that "near-linear" scaling is achieved can be achieved with Bigtable. This page here featuring MySQL's marketing jargon suggests that MySQL is capable of scaling linearly. Where is the truth?

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  • using the data-custom="" to bind to events

    - by Dean Peterson
    I'm pretty sure I'm gonna get slammed on this. I love using the data-whatever attribute to bind events to. It feels very clean to me and helps reserve my class attribute for just styling. I know this selector is among the slowest, so I don't use it when there are a lot of elements. Would love to hear compelling arguments against this. $("body").delegate("[data-action]", "click", function(){ var action = $(this).attr("data-action"); //route action to appropriate function });

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  • Best practice for viewflipper containing 10 linearlayouts?

    - by Brad Hein
    I'm embarking on a GUI Activity composed of a viewflipper, which I would like to contain 10 linearlayout layouts. Is it advisable to put all of my layouts into the same XML resource/layout file? If not, is there a more organized approach to coding a viewflipper with many layouts? Will having everything in the same file come at a significant performance cost?

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  • jQuery change selected option's background on change of selected item

    - by Scott B
    I have a routine that dynamically changes a select list's "selected" option when the corresponding image from a carousel widget is clicked (it's a wordpress template selector). I'd just like to add a flash of background color, then fade to white, to give the user a visual cue that they've just changed the value of the template chooser select list. I've attempted at it below to assign the className "mySelectedOption" to the selected option, but its not working. I'm sure there is perhaps a better way to get the visual cue I'm looking for, (since the css change is static and wont fade back to white background) $('#carousel ul li').click(function(e) { var myOption = $(this).children('img').attr('title'); $("#myTheme option[value='"+myOption+"']").attr('selected', 'selected'); $("#myTheme :selected]").attr('className', 'mySelectedOption'); });

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  • Titanium vs The Native Tools

    - by Elfira
    Hi, I'm still checking everything out. I'm wondering what the limitations are if we develop the app using Titanium. What cannot be done using Titanium, for iPhone and for Android? What things can only be done using only the the native tools? I heard that performance could be an issue. How bad is this going to be? Thank you in advance. :)

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  • What's the different between these 2 mysql queries? one using left join

    - by Lyon
    Hi, I see people using LEFT JOIN in their mysql queries to fetch data from two tables. But I normally do it without left join. Is there any differences besides the syntax, e.g. performance? Here's my normal query style: SELECT * FROM table1 as tbl1, table2 as tbl2 WHERE tbl1.id=tbl2.table_id as compared to SELECT * FROM table1 as tbl1 LEFT JOIN table2 as tbl2 on tbl1.id=tbl2.id Personally I prefer the first style...hmm..

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  • Zend_Paginator - Increase querys

    - by poru
    Hello, I started using Zend_Paginator, it works everything fine but I noticed that there is one more query which slows the load time down. The additional query: SELECT COUNT(1) AS `zend_paginator_row_count` FROM `content` The normal query: SELECT `content`.`id`, `content`.`name` FROM `content` LIMIT 2 PHP: $adapter = new Zend_Paginator_Adapter_DbSelect($table->select()->from($table, array('id', 'name'))); $paginator = new Zend_Paginator($adapter); Could I merge the two querys into one (for better performance)?

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  • simpledb, sql azure, mysql + memcached

    - by sirmak
    For a new scalable high traffic global ecommerce website (asp.net) project which technology fits best (max. scalability & performance, min. price & maintenance)? amazon simpledb, microsoft sql azure, mysql + memcached combo, or your solution...

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  • Uibutton events

    - by Raju
    //My Button code --------------------------------------------------------------------------------------------------- UIButton *ticketButtonObj=[[ticketButton alloc]initWithFrame:CGRectMake(0.0f, 115.0f, 500.0f, 40.0f) ; int col=10; [ticketButtonObj addTarget:self action:@selector(ShowNumber:) forControlEvents:UIControlEventTouchUpInside]; [self.window addSubview:ticketButtonObj]; -(void) ShowNumber:(id)sender{ // here i want to get the Value of Col } in the above code when i pressed the button.. i want print the value of col variable in ShowNumber method .. how it is ? pls Help me ... thanks and regards... by raju

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  • Re-using jQuery widgets

    - by Micor
    I am looking for a most efficient way to re-use widgets with different selectors... For example if I have: $("#selector1").datepicker({ beforeShow: function(var1,var2) { // do stuff }, onClose: function(var1,var2) { // do stuff }, onSelect: function(var1,var2) { // do stuff } }) And later I am looking to assign this same widget with same functions inside to other selectors which are not known at load time. Since its not about choosing a better selector and I want to avoid: $("#new-selector2").datepicker({ beforeShow: function(var1,var2) { // do stuff }, onClose: function(var1,var2) { // do stuff }, onSelect: function(var1,var2) { // do stuff } }) $("#new-selector3").datepicker({ beforeShow: function(var1,var2) { // do stuff }, onClose: function(var1,var2) { // do stuff }, onSelect: function(var1,var2) { // do stuff } }) What would be the best way of doing something like: var reusableDatepicker = datepicker({ beforeShow: function(var1,var2) { // do stuff }, onClose: function(var1,var2) { // do stuff }, onSelect: function(var1,var2) { // do stuff } }) $("#selector1").attach(reusableDatepicker); $("#new-selector2").attach(reusableDatepicker); $("#new-selector3").attach(reusableDatepicker); I know it has to be obvious to all jQuery devs out there, so obvious I cannot find it in docs :) Thank you!

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  • Multithreaded Haskell

    - by Ingdas
    Hi I'm learning Haskell and I'd like to write some multithreaded programs now to see the performance gains from that in a functional language. I can find some references to it on the internet but never a proper introduction to it. Can anyone point me to a guide which is understandable for someone who knows the syntax fairly well, but is not a wizard in Haskell?

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  • UINavigationController Right button

    I am unable to set any property of parentController (which is always a UINavigationController in my case) from child views. e.g. I want to add a button on the navigation bar using following code: UINavigationController* parentController = (UINavigationController)self.parentViewController; UIBarButtonItem *addButton = [[[UIBarButtonItem alloc] initWithTitle:@"Something" style:UIBarButtonItemStyleBordered target:self action:@selector(doSomething)] autorelease]; [_parentController.navigationItem setRightBarButtonItem:addButton animated:YES]; This code runs perfectly without errors but I can't see any button added to the navigation bar. Thanks in advance.

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  • ASIHTTP: addOperation when other threads are running

    - by user262325
    Hello everyone I have a project using ASIHTTP to multi download files from a site when I add a new request: [networkQueue cancelAllOperations]; [networkQueue setDownloadProgressDelegate:a]; [networkQueue setDelegate:self]; [networkQueue setRequestDidFinishSelector:@selector(requestDone:)]; NSURL *url = [NSURL URLWithString:@"http://www.google.com"]; ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url]; [request setDelegate:self]; [request startAsynchronous]; [networkQueue addOperation:request]; [networkQueue go]; it reported: * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '* -[ASINetworkQueue addOperation:]: operation is executing and cannot be enqueued' It looks like I can not add a new request when others are running. Welcome any comment Thanks interdev

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  • Why is this code's execution speed so different?

    - by Steve Watkins
    In Internet Explorer 7, this code executes consistently in 47 ms: function updateObjectValues() { $('.objects').html(12345678); // ~500 DIVs } however, this code executes consistently in 157 ms: function updateObjectValues() { $('.objects').html('12345678'); // ~500 DIVs } Passing a number is over 3x faster than a string. Why are these results so dramatically different? And, is there any way to help the performance of the string?

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  • jQuery - Add click event to Div and go to first link found

    - by LuckyShot
    Hi guys, I think I've been too much time looking at this function and just got stuck trying to figure out the nice clean way to do it. It's a jQuery function that adds a click event to any div with a click CSS class found in the page and when clicked it redirects the user to the first link found in the div. function clickabledivs() { $('.click').each( function (intIndex) { $(this).bind("click", function(){ window.location = $( "#"+$(this).attr('id')+" a:first-child" ).attr('href'); }); } ); } The code simply works although I'm pretty sure there is a fairly better way to accomplish it, specially the selector I am using: $( "#"+$(this).attr('id')+" a:first-child" ) looks too long and slow. Any ideas? Please let me know if you need more details. Thanks! PS: I've got some jQuery benchmarking reference from Project2k.de here: http://blog.projekt2k.de/2010/01/benchmarking-jquery-1-4/

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  • Sometimes UIImageView seems to reject the image taken with iPhone Camera

    - by maxbareis
    Hi, it is very strange, because this error doesn't happen all the time... I have the following code: - (IBAction)getPhoto:(id)sender { UIImagePickerController * picker = [[UIImagePickerController alloc] init]; picker.delegate = self; #if TARGET_IPHONE_SIMULATOR picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; #else picker.sourceType = UIImagePickerControllerSourceTypeCamera; #endif [self presentModalViewController:picker animated:YES]; } with the corresponding delegated selector - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { UIImage *image = [[info objectForKey:@"UIImagePickerControllerOriginalImage"] imageByScalingToSize:CGSizeMake(480, 320)]; [[self imageView] setImage:image]; [picker dismissModalViewControllerAnimated:YES]; } strange thing is, somtimes the image appears in imageView and sometimes not. I have called (gdb) po UIImagePNGRepresentation(image) right after setImage and stuffed the output into a file. The file is a perfect png. Has anyone experienced the same? Has anyone found a solution for it? Thanks in advance Max

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  • How to remove animation glitch ?

    - by hib
    Hi all , I am downloading and then parsing some data on separate thread and then updating my ui on main thread with the following code but in this scenario I am getting animation "glitch" . I have read this word somewhere . - (void)didFinishParsing2:(NSArray *)appList { [self performSelectorOnMainThread:@selector(handleLoadedApps2:) withObject:appList waitUntilDone:NO]; self.queue = nil; // we are finished with the queue and our ParseOperation } - (void)handleLoadedApps2:(NSArray *)loadedApps{ [activityLabel removeFromSuperview]; self.controller.MyArray = (MyClass *)[arrMyArray objectAtIndex:0]; [[MySharedClass sharedSource].detailSource setObject:self.controller.MyArray forKey:someObject]; self.controller.hidesBottomBarWhenPushed = YES; isPushed = YES; [[self navigationController] pushViewController:self.controller animated:YES]; } Can anyone tell me what I am doing wrong so that I can remove the animation glitch .

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