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• Implement password recovery best practice

  - by Enrique

  Hello I want to to implement password recovery in my web application. I'd like to avoid using secret questions. I could just send the password by e-mail but I think it would be risky. Maybe I could generate a new temporary random password and send it by e-mail but I think it is as risky as the above point. Can I send a url by e-mail for example http://mysite.com/token=xxxx where xxxx is a random token associated with the user. So when the user navigates to that url he/she can reset the password. Any ideas?

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• Memory leak issue with UIImagePickerController

  - by Mustafa

  I'm getting memory leak with UIImagePickerController class. Here's how I'm using it: UIImagePickerController *picker = [[UIImagePickerController alloc] init]; picker.delegate = self; picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; [self presentModalViewController:picker animated:YES]; [picker release]; To remove the picker i call [picker dismissModalViewControllerAnimated:YES]; in didFinishPickingImage and imagePickerControllerDidCancel. -- Instruments show around 160bytes leaking as a result of this instruction: +[UIImagePickerController _loadPhotoLibraryIfNecessary] Apparently this issue has and is disturbing many people, and solution to avoid this problem is to build a singleton class dedicated for picking images from library or capturing using device's build in camera. Anyone want to add something?

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• JodaTime DateFormatter to display milliseconds if nonzero

  - by Mike

  I want to display a list of dates that may or may not have milliseconds on them. If a certain entry has milliseconds, then it should be displayed like yyyy MM dd HH:mm:ss.SSS. If it doesn't have the millis, I need it displayed as yyyy MM dd HH:mm:ss. I suppose the general question is: Is there a way to describe an optional format string parameter? (I'd like to avoid refactoring all of the places that I use formatters since this is a large code base.)

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• MPI_SCATTER Fortran Matrices by Rows

  - by Fortran

  What is the best way to scatter a Fortran 90 matrix by its rows rather than columns? That is, let's say I have a matrix a(4,50) and I want to MPI_SCATTER it onto two processes where each part is alocal(2,50), where rank 0 has rows 1 and 2, and rank 1 has 3 and 4. Now, in C, this is simple since arrays are row-major, but in Fortran 90 they are column-major. I'm trying to avoid using TRANSPOSE to flip a before scattering (i.e, doubling the memory use), and I figure there must be a way in MPI to do this. Would it be MPI_TYPE_VECTOR? MPI_TYPE_CREATE_SUBARRAY? Likewise, what if I have a 3d array b(4,50,3) and I want two scattered matrices of blocal(2,50,3) distributed as above?

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• What is your development checklist for Java low-latency application?

  - by user49767

  I would like to create comprehensive checklist for Java low latency application. Can you add your checklist here? Here is my list 1. Make your objects immutable 2. Try to reduce synchronized method 3. Locking order should be well documented, and handled carefully 4. Use profiler 5. Use Amdhal's law, and find the sequential execution path 6. Use Java 5 concurrency utilities, and locks 7. Avoid Thread priorities as they are platform dependent 8. JVM warmup can be used As per my definition, low-latency application is tuned for every Milli-seconds.

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• How to solve lazy initialization exception using JPA and Hibernate as provider

  - by rupertin

  I am working on a project for a customer who wants to use lazy initialization. They always get "lazy initialization exception" when mapping classes with the default lazy loading mode. @JoinTable(name = "join_profilo_funzionalita", joinColumns = {@JoinColumn(name = "profilo_id", referencedColumnName = "profilo_id")}, inverseJoinColumns = {@JoinColumn(name = "funzionalita_id", referencedColumnName = "funzionalita_id")}) //@ManyToMany(fetch=FetchType.EAGER) - no exceptions if uncommented @ManyToMany private Collection<Funzionalita> funzionalitaIdCollection; Is there a standard pattern using JPA classes to avoid this error? Snippets are welcome, thanks a lot for your time.

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• Regex - find and replace complete string occurrences only (not partial matches)

  - by vittore

  I'm not very good at regex but maybe there's a simple way to achieve this task. I'm given a string like "bla @a bla @a1 bla" I'm also given pairs like {"a", "a2"} , {"a1", "a13"}, and I need to replace @a with @a2 for the first pair, and @a1 with @a13 for the second one. The problem is when i use String.Replace and look for @a, it also replaces @a1 but it should not. I need it to completely match @a and avoid partially matching it in other places. Note: the given string could also be brackets, commas, dots and so on. However, pairs will always be [a-z]*[0-9]+ Help me with regex replace, please. Cheers

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• Maintain set of local commits working with git-svn

  - by benizi

  I am using git to develop against a project hosted in subversion, using git-svn: git svn clone svn://project/ My general workflow has been to repeatedly edit-and-commit on the master branch, then commit to the svn repository via: git stash git svn dcommit git stash apply One of the local modifications that 'stash' command is preserving, that I don't want to commit to the svn repository, is a changed database connection string. What's the most convenient way to keep this local change without the extra 'stash' steps? I suspect that something like 'stash' or 'quilt' is what I'm looking for, but I'm still new enough to git that I think I'm missing some terminology that would lead to the exact incantation. Update: The only solution I found that seems to avoid the git stash + git-svn action + git stash apply series was to update the git-svn ref manually: (check in local-only change to 'master', then...) $ cat .git/refs/master > .git/refs/remote/git-svn $ git svn fetch (with at least one new SVN revision) And that leaves the local-only commit as a weird (probably unsafe) commit between two svn revisions.

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• Subversion lock-modify-unlock solution for SSIS .dtsx

  - by EasyDot

  Hello! I wonder how i could set up a developer enviroment for SSIS,.dtsx packages in Subversion? I read about Subversion "svn:needs-lock" property and the ability to set auto-props in a subversion repository by setting "enable-auto-props = yes" in the repository config file. The "svn:needs-lock" property is neccesary when working with SSIS,dtsx to handle the files like binary files wich must be locked to avoid mergingconflicts. How should i configure Subversion config file for this kind of development? An example for setting auto-prop svn:needs-lock to .doc files (I think its working?!): [miscellany] enable-auto-props = yes [auto-props] *.doc = svn:mime-type=application/msword;svn:needs-lock=*

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• putpixel with pyglet

  - by pts

  I'm new to pyglet. I'd like to change a pixel from black to white at each on_draw iteration. So after 1000 iterations, there should be exactly 1000 white pixels in the window. However, I'd like to avoid calling 1000 draw operations in on_draw for that. So I'd like to create an image, do an RGB putpixel on the image, and blit the image to the screen. How can I do that? The pyglet documentation, the examples and the source code aren't too helpful on this.

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• How to set selected segment index in UISegmentedControl? (iPhone SDK)

  - by seanny94

  Hello all! I'm trying to avoid an app crash here... I have a button that will remove a segment from a UISegmentedControl. If that button is pressed and the user has the segment to be removed selected, the segment will remove and no selection will be highlighted. However, when another button is pushed that does an action that retrieves the selectedSegmentIndex, the app crashes. In short: Is there any way to force the selection of a segment in a UISegmentedControl? edit it seems as though the UISegmentedControl is returning a selectedSegmentIndex of -1 when no segment is selected... let's see what I can do from here.

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• How to determine MS Access field size via OleDb

  - by Andy

  The existing application is in C#. During startup the application calls a virtual method to make changes to the database (for example a new revision may need to calculate a new field or something). An open OleDb connection is passed into the method. I need to change a field width. The ALTER TABLE statement is working fine. But I would like to avoid executing the ALTER TABLE statement if the field is already the appropriate size. Is there a way to determine the size of an MS Access field using the same OleDb connection?

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• Python Instance Variable as Default Parameter

  - by DuneBug

  Hello, I have am writing a Python function that takes a timeout value as a parameter. Normally, the user will always use the same timeout value, but on occasion he may want to wait slightly longer. The timeout value is stored as a class instance variable. I want to use the class' timeout instance variable as the default parameter. Currently, I am implementing this as follows: def _writeAndWait (self, string, timeout = -1): if (timeout == -1): timeout = self._timeout I was just wondering, is the proper way to use an instance variable as a default parameter? Or is there a better way that would avoid the "if" check? Thanks, Ryan

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• GCC without Xcode on OS X

  - by Konrad Rudolph

  I've just unwrapped my new MacBook Pro (yay!) and am now setting it up properly for development. Since I want to avoid clutter, I'm wondering if I really need to install the Xcode tools at all (I never use the IDE or Mac specific tools), since I'll install a newer version of GCC anyway, using MacPorts. So, is there any benefit in installing Xcode? Is it necessary? What kind of set-up does it do behind the scenes? Basically: can I skip this or will it come back to haunt me because some Unix development tools just assume that OS X is always set up in this way?

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• web development with ruby without rails?

  - by kmorris511

  For reasons beyond my control, I'm being tasked with Ruby web development that does NOT use Rails or really any other heavyweight framework such as Merb. I'm wondering if anybody else has encountered this and can recommend best practices or resources that describe best practices for such a problem. I'd like to avoid the dreaded out.print('<td class="foo">'+some_data+'</td>') style of web development. A coworker has suggested Rack as a light framework but the documentation is sketchy and it seems unproven in the market.

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• Changing UIImageView animation speed

  - by Nikolas Stephan

  I am using the UIImageView to animate a bunch of images. I know that I can change the speed by altering animationDuration, but that doesn't seem to take effect until the animation is restarted. My problem is that beside not really wanting to have to restart the animation as this limits me to only being able to change the speed once per cycle, there also doesn't seem to be a way to find out what frame is currently being shown and I would therefore have to rely on a timer to "guess" which one it is. So my question is whether there is a way to change the speed without restarting the animation and if not is there some way I could avoid the aforementioned problem? I'm not too keen to write my own animation class, but may end up having to if there isn't a nicer solution.

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• Java Web Start: unsigned cglib

  - by Pticed

  I am using hibernate on the server side with a client application started via Java Web Start. I can't sign the jars (I'd like to but I can't). I get a permission exception when I get a POJO with lazy fields. Caused by: java.security.AccessControlException: access denied (java.util.PropertyPermission cglib.debugLocation read) at java.security.AccessControlContext.checkPermission(Unknown Source) at java.security.AccessController.checkPermission(Unknown Source) at java.lang.SecurityManager.checkPermission(Unknown Source) at java.lang.SecurityManager.checkPropertyAccess(Unknown Source) at java.lang.System.getProperty(Unknown Source) at net.sf.cglib.core.DebuggingClassWriter.(DebuggingClassWriter.java:35) ... 44 more How can I avoid that? I thought about setting the collection to null before returning the pojo to the client but I'd like to find a better solution.

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• MySql timeouts - Should I set autoReconnect=true in Spring application?

  - by George

  After periods of inactivity on my website (Using Spring 2.5 and MySql), I get the following error: org.springframework.dao.RecoverableDataAccessException: The last packet sent successfully to the server was 52,847,830 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem. According to this question, and the linked bug, I shouldn't just set autoReconnect=true. Does this mean I have to catch this exception on any queries I do and then retry the transaction? Should that logic be in the data access layer, or the model layer? Is there an easy way to handle this instead of wrapping every single query to catch this?

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• How can I force mod_perl to only allow one process per connection?

  - by Charles Ma

  I have a perl cgi script that's fairly resource intensive (takes about 2 seconds to finish). This is fine as long as only at most 4 or 5 of them are running at the same time and that's usually the case. The problem is that when a user clicks a link that calls this script, a new process is spawned to handle that connection request, so if a user clicks many times (if they're impatient), the server gets overloaded with new processes running and most of them are redundant. How can I ensure that only one instance of this process is running per host? This is an old system that I'm maintaining which uses an old framework for the frontend, and I would like to avoid using javascript to disable the button client side if possible. Converting this to fast-cgi perl is out of the question as well, again because this is an old system and adding fast-cgi to apache might break a lot of other things that this thing runs.

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• Freehand drawing with Quartz 2D

  - by qutaibah

  I am trying to develop a simple freehand-drawing app for red-marking some of my images. Below is a method that is called from within the drawRect. I want to ask if there is a way to avoid add the path every time the path is redrawn? Also, the way the draw method is set up, the drawing gets a bit slow and choopy after a few seconds. How can I improve the smoothness of the drawn path? thanks -(void)freehandDraw:(CGContextRef)context inRect:(CGRect)rect { CGPathAddLineToPoint( path, NULL, drawTip.x, drawTip.y); CGContextAddPath( context, path); CGContextStrokePath(context); } // method

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• UIPopoverController gesture handling in UISplitViewController for iOS 5.1 and below

  - by 5StringRyan

  I've (along with many others) have noticed that Apple changed the appearance of the popover controller to use a "slider" window rather than the usual "popover" tableview that I've used. While I'm okay with the new appearance, like others I'm having issues with the swipe gesture that is introduced: iOS 5.1 swipe gesture hijacked by UISplitViewController - how to avoid? The fix for this seems to be to set the split view controller method "presentWithGesture" to "NO." UISplitViewController *splitViewController = [[UISplitViewController alloc] init]; splitViewController.presentsWithGesture = NO; This works great if the user is using iOS 5.1, however, if this code is run using iOS 5.0 or below, an exception is thrown since this method is only available for iOS 5.1: Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UISplitViewController setPresentsWithGesture:]: unrecognized selector Is it possible to get rid of this gesture without using this method so that it's backwards compatible with iOS' 5.0 and below?

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• Can I split an IEnumerable into two by a boolean criteria without two queries?

  - by SFun28

  Folks, Is it possible to split an IEnumerable into two IEnumerables using LINQ and only a single query/linq statement? In this way, I would avoid iterating through the IEnumerable twice. For example, is it possible to combine the last two statements below so allValues is only traversed once? IEnumerable<MyObj> allValues = ... List<MyObj> trues = allValues.Where( val => val.SomeProp ).ToList(); List<MyObj> falses = allValues.Where( val => !val.SomeProp ).ToList();

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• Can I use imp/exp tools to migrate database from Oracle 9 to Oracle 10

  - by Karol Kolenda

  I'm subcontractor and my client wants to upgrade Oracle database from 9 to 10. Other vendor is going to perform the upgrade process, and I was asked to create whatever backup I need before the upgrade, and then recreate the environment in Oracle 10. All my data is stored in a separate database in a single schema. No fancy relations, scripts or anything like this (actual app supports different dbs: Oracle, SQL Server, Postgres so we want to avoid any DB-specific code). I was hoping to use imp/exp but I'm not sure if imp/exp are backward compatible (exp from O9 and imp to O10)? If there is a better/recommended way of dealing with similar situation, I'll be grateful for any advice.

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• How can we calculate sea distances using waypoints ?

  - by Ashish Ranpara

  Hi Friends, I have one query in which I really stuck at that. I have port database with waypoints and also routing points which I need to use in distance calculation between two ports. I have done lots of R&D to find formula which gives me distance between two points. I also need shortest route which is possible. I have reviewed online tools which allow user to calculate the distance. But I want to do the same at my own. I have reviewed Port World Distance Calculator. I reviewed the Great Circle formula to achieve that but I don't know that how we avoid landscapes in sea distance and in which direction I need to find distance for second port.

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• How do I iterate over the properties of an anonymous object in C#?

  - by Tomas Lycken

  I want to take an anonymous object as argument to a method, and then iterate over its properties to add each property/value to a a dynamic ExpandoObject. So what I need is to go from new { Prop1 = "first value", Prop2 = SomeObjectInstance, Prop3 = 1234 } to knowing names and values of each property, and being able to add them to the ExpandoObject. How do I accomplish this? Side note: This will be done in many of my unit tests (I'm using it to refactor away a lot of junk in the setup), so performance is to some extent relevant. I don't know enough about reflection to say for sure, but from what I've understood it's pretty performance heavy, so if it's possible I'd rather avoid it... Follow-up question: As I said, I'm taking this anonymous object as an argument to a method. What datatype should I use in the method's signature? Will all properties be available if I use object?

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