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• *Client* scalability for large numbers of remote web service calls

  - by Yuriy

  Hey Guys, I was wondering if you could share best practices and common mistakes when it comes to making large numbers of time-sensitive web service calls. In my case, I have a SOAP and an XML-RPC based web service to which I'm constantly making calls. I predict that this will soon become an issue as the number of calls per second will grow. On a higher level, I was thinking of batching those calls and submitting those to the web services every 100 ms. Could you share what else works? On a lower level side of the things, I use Apache Xml-Rpc client and standard javax.xml.soap.* packages for my client implementations. Are you aware of any client scalability related tricks/tips/warnings with these packages? Thanks in advance Yuriy

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• WMIprvse process leaks memory on 2008 server R2

  - by Dani Fischer

  I have a Windows 2008 R2 server running on a VM machine. My .NET service is running on this server periodically querying WMI, for example: SELECT ProcessId FROM Win32_Service WHERE ... After a day or two WMIprvse takes up to 500M memory and WMI queries start getting out of memory exceptions. This article seems to be talking about this issue: "http://support.microsoft.com/kb/958124" I've seen other articles saying that Microsoft is aware of the problem and not going to issue a fix until the next major release. http://social.msdn.microsoft.com/Forums/en/netfxbcl/thread/256eb40c-d050-4278-a3d8-863e30db02a0 I'd appreciate any suggestions and insights on this.

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• Codeigniter and Paypal: How it works

  - by Abs

  Hello all, Two random question as I try to integerate Paypal IPN into my Codeigniter based web app. 1) Are these two lines the same? $data['pp_info'] = $this->input->post(); $data['pp_info'] = $_POST; 2) A user agrees to pay a monthly recurring fee to use your service using paypal - first payment you are aware they have paid as you get data returned from paypal. But how do you keep track if users has paid for the following months? How do you know the user has not cancelled from their paypal account? Thanks all for any help

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• What's an efficient way of calculating the nearest point?

  - by Griffo

  I have objects with location data stored in Core Data, I would like to be able to fetch and display just the nearest point to the current location. I'm aware there are formulas which will calculate the distance from current lat/long to a stored lat/long, but I'm curious about the best way to perform this for a set of 1000+ points stored in Core Data. I know I could just return the points from Core Data to an array and then loop through that looking for the min value for distance between the points but I'd imagine there's a more efficient method, possibly leveraging Core Data in some way. Any insight would be appreciated. EDIT: I don't know how I missed this on my initial search but this SO question suggests just iterating through an array of Core Data objects but limiting the array size with a bounding box based on the current location. Is this the best I can do?

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• What does sub error code 568 mean for Ldap Error 49 with Active Directory

  - by Dean Povey

  I am writing some Java code that authenticates to Active Directory using SASL GSSAPI. Mostly this code is working fine but for one user I am getting the response: javax.naming.AuthenticationException: [LDAP: error code 49 - 8 0090304: LdapErr: DSID-0C0904D1, comment: AcceptSecurityContext error, data 568, v1772 ] I know that 49 means this is an authentication failure, and that the relevant sub code is 568, but I am only aware of the following meanings for that data: 525 - user not found 52e - invalid credentials 530 - not permitted to logon at this time 532 - password expired 533 - account disabled 701 - account expired 773 - user must reset password So far I am unable to find an authorative source of these error codes from Microsoft (this list is pieced together from forum posts) and I can't find anything for that 568 error. Does anyone know what it means?

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• How to access MyProject.MySettings.Default.SomeSetting from xaml?

  - by Shimmy

  I have defined a StringCollection in the Project Settings. I want to use the values in a ComboBox. Is there a way to access it xamly? I tried: <CollectionViewSource Source="{x:Static src:MySettings.Default.MyCollection}" /> <CollectionViewSource x:Key="RoomSections" Source="{x:Static src:MySettings.Default.RoomSections}" /> *src is the xmlns of the project It says: "Type src:MySettings.Default was not found". The thing is that MySettings is a class that offers a Default property which is a thread-safe instance of MySettings, I really want to get the collection from the Default property and not by instantiating a new on. Is there other ways I am not aware of, maybe ObjectDataProvider can access static objects? I thought, maybe I can make in the App.xaml a global resource that return MySettings.Default which is an instance of the MySettings class, and then access all its properties, I will try that out, but I prefer the easy way.

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• Java - When to use Iterators?

  - by Walter White

  Hi all, I am trying to better understand when I should and should not use Iterators. To me, whenever I have a potentially large amount of data to iterate through, I write an Iterator for it. If it also lends itself to the Iterator interface, then it seems like a win. I was reading a little bit that there is a lot of overhead with using an Iterator. A good example of where I used an Iterator was to iterate through a bunch of SQL scripts to execute one query at a time, reading it in, then executing it. Is there another performance trade off I should be aware of? Before I used iterators, I would read the entire String of SQL commands to execute into an ArrayList, and the iterate through that. If the import is rather large (like for geolocation data, then the server tends to get bogged down). Walter

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• Migrating test cases & defects from Quality Center to TFS 2008/2010

  - by stackoverflowuser

  Tool that can be used to migrate (or even better..synchronize) test cases and bugs between: TFS 2008 and Quality Center 9.2 (or later) TFS 2010 and Quality Center 9.2 (or later) I am aware of the following tools: Test Case Migrator (Excel/MHT) Tool TFS Bug Item Synchronizer 2.2 for Quality Center Also shai raiten mentions on his blog about QC 2 Team System 2010 migration tool that he has been working on and its done. But could not find any link for downloading the tool. http://blogs.microsoft.co.il/blogs/shair/archive/2009/12/31/quality-center-migration-to-team-system-2010-done.aspx Before jumping on coding with TFS SDK and QC components to come up with my own tool I need some inputs from the stackoverflow community.

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• Loading an external SWF App in a new Air window with resize functionality

  - by t.stamm

  Hello everyone, i'm trying to load a local SWF Application in my Air Application via the SWFLoader class. The SWFLoader class is displayed in a new Window. Therefore, i'm trying to resize the window automatically, when the Flash Application is resizing. But here's the problem. The SWFLoader does not get any events when the loader App has been resized. The Problem seems to be the Sandbox Restrictions. I'm able to call methods in the childSandboxBridge and parentSandboxBridge Objects that i've set in the LoaderInfo of the SWFLoaders content (the loaded SWF Application). But i cannot listen to any ResizeEvents or something like that when i'm resizing the loaded App. I'm aware of the workaround with the Loader Class and the codeExecution Property, but i don't want to bypass the Air Sandbox - if possible. Can anyone help me with this? Thanks in advance

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• Can I force MySql table name case sensitivity on file systems that aren't case sensitive

  - by Brian Deacon

  So our target environment is linux, making mysql case-sensitive by default. I am aware that we can make our linux environment not case sensitive with the lower_case_table_names variable, but we would rather not. We have a few times been bitten with a case mismatch because our dev rigs are OSX, and mysql is not case sensitive there. Is there a way we can force table names to be case sensitive on my OSX install of MySql (5.0.83 if that matters) so that we catch a table name case mismatch prior to deploying to the integration servers running on linux?

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• WPF - Virtualizing an ItemsControl?

  - by Rachel

  I have an ItemsControl containing a list of data that I would like to virtualize, however VirtualizingStackPanel.IsVirtualizing="True" does not seem to work with an ItemsControl. Is this really the case or is there another way of doing this that I am not aware of? To test I have been using the following block of code: <ItemsControl VirtualizingStackPanel.IsVirtualizing="True" ItemsSource="{Binding Path=AccountViews.Tables[0]}"> <ItemsControl.ItemTemplate> <DataTemplate> <TextBlock Initialized="TextBlock_Initialized" Margin="5,50,5,50" Text="{Binding Path=Name}" /> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl> If I change the ItemsControl to a ListBox, I can see that the Initialized function only runs a handful of times (the huge margins are just so I only have to go through a few records), however as an ItemsControl every item gets initialized. I have tried setting the ItemsControlPanelTemplate to a VirtualizingStackPanel but that doesn't seem to help.

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• What causes a JRE 6 JVM code cache leak?

  - by Arturo Knight

  Since switching to JRE 6, my server's code cache usage (non-heap) keeps growing indefinitely. My application creates a lot of classes at runtime, BUT these classes are successfully unloaded during the GC process. I can see these classes getting unloaded in the gc logs and also the permGen usage stays constant. I specifically make sure in my code that these classes are orphaned once I am finished with them and so they correctly get garbage collected from permGen. The code cache however keeps growing. I only became aware of the code cache after switching to JRE 6. So I guess my questions are: Does GC include the code cache? What could cause a code cache memory leak, specifically. Is there a bug in JDK 6 in this area?

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• Static/Dynamic vs Strong/Weak

  - by Dan Revell

  I see these terms banded around all over the place in programming and I have a vague notion of what they mean. A search shows me that such things have been asked all over stack overflow in fact. As far as I'm aware Static/Dynamic typing in languages is subtly different to Strong/Weak typing but what that difference is eludes me. Different sources seem to use different different meanings or even use the terms interchangeably. I can't find somewhere that talks about both and actually spells out the difference. What would be nice is if someone could please spell this out clearly here for me and the rest of the world.

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• Emacs Column based Narrowing or Folding

  - by froit

  Is there column based narrowing in emacs. I tend narrow in one everything between script tags but that still keeps the original indent (space before var). It would be great if I could actually column narrow to the the beginning of the indent since otherwise the electrict indent tries to bring it to column 0. var foo = 1; var bar = 2; Alternate solution could be to mark the starting indents as uneditable, but I am also not sure how to do this. P.S. I am aware of MMM and NXHTML and html-helper-modes, but I am not looking to use them due to complexities.

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• iPhone Simulator 3.x not supported after upgrading to XCode 3.2.3 Beta4 with OS 4.0

  - by Jon

  I've been having some problems, & since you guys are the smartest devs I thought I'd just ask you. When I last installed Xcode 3.2.3 Beta 2 (OS 4.0 support), it had all the iPhone Device & Simulator 3.x. Now, updated to Xcode 3.2.3 Beta 4 (OS 4.0 support), it no longer lists 3.x SDKs for either simulator or device in XCode. I'm aware that 3.2.3 changes the BASE SDK to 4.0, but how come none of the 3.x devices are available either? When I go to: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs The only two files available are: iPhoneSimulator3.2.sdk iPhoneSimulator4.0.sdk However, when I go to: /Developer/Platforms/iPhoneOS.platform/DeviceSupport 3.0 3.0.1 3.1 3.1.1 3.1.2 3.1.3 3.2 4.0 (8A274b)

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• Blank Pages with Zen Cart v1.3.8 and PHP 5.3

  - by Michael Soriano

  I am trying to run a live Zen Cart store (version 1.3.8) on a my local machine which is PHP 5.3. I am aware of the incompatibilities between both versions and have dealt with it by applying the patch found here: http://www.zen-cart.com/forum/showthread.php?t=140960 I am able to login the admin side no problem, but when i navigate to the store - all i see are blank pages. How can I fix this issue? I'm hoping there is a fix elsewhere. Trying not to revert to an older PHP installation.

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• Why not allow mutation of the this binding?

  - by gnucom

  Hi Everyone, I'm building a interpreter/compiler for a school project (well now its turning into a hobby project) and an instructor warned me not to allow mutation of the 'this' binding (he said it was gross and made a huge deal about it) but I never learned why this is so... dangerous or bad. I'm very curious about why this is so bad. I figured this sort of feature could be useful in some way or another. I'm wondering if anyone familiar with building languages can tell me what sort of problems mutation on the 'this' binding can cause, and if they know of any cool or useful tricks that one could do if it actually was allowed. Do any languages that you're aware of allow mutation of 'this'? Thanks,

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• Enabling a trace spec on Glassfish v2

  - by Kiran

  Hi Guys, I guess this might be answered previously but I dont seem to find one answered . Can anyone please lemme know hot to add a trace spec in Glassfish v2. Am very much new to this so not much aware of this. I need to enable a security trace string and orb trace string on Glassfish v2 .On Glassfish v3 I see a file called logging.properties where all the trace string been given , is there any such file on v2 to work with or we need to add a property to domain.xml. Thanks in advance.

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• double.NaN Equality in MS Test

  - by RichK

  Why am I getting this result? [TestMethod] public void nan_test() { Assert.AreEqual(1, double.NaN, 1E-1); <-- Passes Assert.AreEqual(1, double.NaN); <-- Fails } What difference does the delta have in asserting NaN equals a number? Surely it should always return false. I am aware of IsNaN, but that's not useful here (see below). Background: I have a function returning NaN (erroneously) , it was meant to be a real number but the test still passed. I'm using the delta because it's double precision equality, the original test used 1E-9.

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• Gecko/Firefox support for HTML5 Notifications

  - by jAndy

  Hi Folks, I'm wondering if there is any build-in support for the HTML5 Notification feature in Gecko browsers so far? Maybe some hidden developer thingy ? I'm aware of WebKits window.webkitNotifications which works great, so, is there a Firefox implementation ? update After searching and reading some w3c HTML5 specs, I'm maybe a little bit off here. I can't find any Notification feature anywhere there. Am I facing wrong facts here? Is that just a "very own webkit implementation" ?

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• Implementing Security on custom BCS/.net class?

  - by Michael Stum

  I'm implementing a custom BCS Model to get data from a backend system. As the backend uses it's own user management, I'm accessing it through a service account. All of this works well and allows me to pull data into SharePoint. However because it's channeled through the service account, everyone can access it, which is bad. Can anyone give me some tips which method to implement? The backend does not give me NT ACLs, but I wonder if I could just "fake" them somehow? (Essentially saying "This NT Group has Read Access" is good enough). I am aware of ISecurityTrimmer2 for Search Results, but ideally I want to cover security inside the BCS Model so that it applies to external lists as well. I want to avoid using Secure storage and mapping each individual user to the backend.

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• Message Queue or Scheduler

  - by Walter White

  Hi all, I am currently using Quartz Scheduler for asynchronous tasks such as sending an email when an exception occurs, sending an email from the web interface, or periodically analyzing traffic. Should I use a message queue for sending an email? Is it any more efficient or correct to do it that way? The scheduler approach works just fine. If I use a queue and the email failed to send, is it possible for the queue to retry sending the email at a later time? The queue approach looks simpler than the scheduler for tasks that need to happen immediately, but for scheduler tasks, the scheduler still, unless there is more to the queue than I am aware of. I have not yet used JMS, so this is what I have read. Walter

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• What about Programmer "Invisible" registers?

  - by claws

  These are "Programmer Visible" x86-64 registers: What about the invisible registers? Just now I learned that MMU registers, Interrupt Descriptor Table (IDT) uses these invisible registers. I'm learning these things in the hard way. Is there any resource (book/documentation/etc) that gives me the complete picture at once? I am aware of the programmer visible registers and comfortable in programming with them. I just want to learn about invisible registers and their functionality. I want to get a complete picture. Where can I get this info?

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• Tips on upgrading CVS to git/hg?

  - by meder

  We still use CVS, I use git and hg for my personal use though I'm still a novice at both, but I realize they're much more modern and better, faster, distributed, etc. It's just everyone is so accustomed to CVS that I feel a whole slew of issues could arise if I were to be the one that recommended and actually did the upgrading/porting/transitioning of our current CVS server to git or hg. Has anyone actually done this, recently? Could you offer any insight or tips in terms of influencing people to use git/hg, and just generic tips on the actual updating/transitioning if it were to take place? Are there common issues I should be aware of just in general?

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• WebApps tendency

  - by Narek

  There is a strong tendency of making web apps and even seems that very soon a lot of features will be available online so that for every day use people will have all necessary software free online and they will not need to install any software locally. Only specific (professional) tools that usually people don’t use at home will not be available as a web app. So my question, how do you imagine selling software that was necessary for everyday use and was not free (seems they can't make money any more by selling their product – no need of those products). And what disadvantages have web apps, that is to say, what is bad to use software online compared with having the same software locally (please list)? Please do not consider this question not connected with programming, as I would like to have a little statistics from professional programmers who are aware from nowday’s tendency of software and programming. Thanks.

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