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  • is there a signal emiter/consumer engine (like in Django) for .NET (C#)

    - by user118657
    Has .NET (C#) anything like Django's Signals engine? Our business logic become really complicated over few years of adding new features. I'm going to re-architecture it. Currently all features are very coupled that makes regression errors while changing something one one place - some other place may be broken. I really like Django's apps idea where separate applications introduce new functionality and are absolutely separate. Communication between apps is implemented though signals. I wounder if there is something in .NET that allows to divide project business to many separated "apps" (plug-ins, zones, modules, you name it) and make communication using some kind of "signals". For example we have simple order flow. We can add "coupon app" that if exists in the project adds abilities to use discount coupon. We can add "cross sale" module that if exists adds abilities to offer cross-sale products Email notification module that if exists adds abilities to send order email notifications. But in the same time all this modules are "self-contained" means that communication between them is done using emitting signals (ORDER_PROCCESS_START, ORDER_SUCCESS, etcs) and other modules can subscribe to this signals and process them in required way. This architecture is not related to web, all business logic is processed on the server side like without working with HTTP directly. I wonder if it's good architecture from code maintaining and testing point of few, is it possible to do this in .NET? Any drawbacks that I don't realize now?

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  • Why does reusing arrays increase performance so significantly in c#?

    - by Willem
    In my code, I perform a large number of tasks, each requiring a large array of memory to temporarily store data. I have about 500 tasks. At the beginning of each task, I allocate memory for an array : double[] tempDoubleArray = new double[M]; M is a large number depending on the precise task, typically around 2000000. Now, I do some complex calculations to fill the array, and in the end I use the array to determine the result of this task. After that, the tempDoubleArray goes out of scope. Profiling reveals that the calls to construct the arrays are time consuming. So, I decide to try and reuse the array, by making it static and reusing it. It requires some additional juggling to figure out the minimum size of the array, requiring an extra pass through all tasks, but it works. Now, the program is much faster (from 80 sec to 22 sec for execution of all tasks). double[] tempDoubleArray = staticDoubleArray; However, I'm a bit in the dark of why precisely this works so well. Id say that in the original code, when the tempDoubleArray goes out of scope, it can be collected, so allocating a new array should not be that hard right? I ask this because understanding why it works might help me figuring out other ways to achieve the same effect, and because I would like to know in what cases allocation gives performance issues.

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  • jQuery/Ajax IE7 - Long requests fail

    - by iQ
    Hi guys, I have a problem with IE7 regarding an ajax call that is made by jQuery.load function. Basically the request works in cases where the URL string is not too long, but as soon as the URL gets very large it fails. Doing some debugging on the Ajax call I found this error: URL: <blanked out security reasons but it's very long> Content Type: Headers size (bytes): 0 Data size (bytes): 0 Total size (bytes): 0 Transferred data size (bytes): 0 Cached data: No Error result: 0x800c0005 Error constant: INET_E_RESOURCE_NOT_FOUND Error description: The server or proxy was not found Extended error result: 0x7a Extended error description: The data area passed to a system call is too small. As you can see, it looks like nothing is being sent. Now this only happens on IE7 but not other browsers, with IE8 there is a small delay but still works. The same request works fine when the URL string is relatively small. Now I need this working on IE7 for compatibility reasons and I cannot find workarounds for this so any help is greatly appreciated. The actual ajax call is like this: $("ID").load("url?lotsofparams",callbac func(){}); "lotsofparams" can vary, sometimes being small or very large. It's when the string is very large that I get the above error for IE7 only.

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  • jquery displaying table rows dynamically in dom belonging to one/more particular class

    - by whatf
    I have the basic html structure: <table> <tbody> <tr class="1"> <td> <p style="font-size:large"> <span class="muted"> This is the first object </span> </p> </td> </tr> <tr class="2"> <td> <p style="font-size:large"> <span class="muted"> This is second object </span> </p> </td> </tr> <tr class="3"> <p style="font-size:large"> <span class="muted"> this is the third object </span> </p> </td> </tr> </tbody> </table> and then I have check boxes, the functionality i want is, if checkbox 1 is checked, only the tr with class 1 be displayed. if checkbox 2 and 3 are clicked, the tr with class 1 gets hidden and 2, 3 show in the dom. again if checkbox 2,*3* are unchecked and 1 is checked tr with class 2, 3 do not show and 1 is showed. How can this be done in jQuery?

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  • Accessing Application Scoped Bean Causes NullPointerException

    - by user2946861
    What is an Application Scoped Bean? I understand it to be a bean which will exist for the life of the application, but that doesn't appear to be the correct interpretation. I have an application which creates an application scoped bean on startup (eager=true) and then a session bean that tries to access the application scoped bean's objects (which are also application scoped). But when I try to access the application scoped bean from the session scoped bean, I get a null pointer exception. Here's excerpts from my code: Application Scoped Bean: @ManagedBean(eager=true) @ApplicationScoped public class Bean1 implements Serializable{ private static final long serialVersionUID = 12345L; protected ArrayList<App> apps; // construct apps so they are available for the session scoped bean // do time consuming stuff... // getters + setters Session Scoped Bean: @ManagedBean @SessionScoped public class Bean2 implements Serializable{ private static final long serialVersionUID = 123L; @Inject private Bean1 bean1; private ArrayList<App> apps = bean1.getApps(); // null pointer exception What appears to be happening is, Bean1 is created, does it's stuff, then is destroyed before Bean2 can access it. I was hoping using application scoped would keep Bean1 around until the container was shutdown, or the application was killed, but this doesn't appear to be the case.

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  • form validation with jquery and livevalidation

    - by ImpY
    I'm trying to do some form validation with livevaldation & jquery. I've a formular with an input field like that: <div id="prenameDiv" class="control-group"> `<input id="prename" name="prename" class="input-large" placeholder="Max" >` </div> So if there's an error on validation 'livevalidaton' adds the class 'LV_invalid_field' to the input - it looks like that: <div id="prenameDiv" class="control-group"> <input id="prename" name="prename" class="input-large LV_invalid_field" placeholder="Max" > </div> That's ok, but now I'll add another class 'error' to the div 'prenameDiv' when the DOM changes that it looks like that: <div id="prenameDiv" class="control-group error"> `<input id="prename" name="prename" class="input-large LV_invalid_field" placeholder="Max" ` </div> I tried it that way: if ($("#prenameDiv").bind("DOMSubtreeModified")){ `if ($("#prename").hasClass("LV_invalid_field")) {` $("#prenameDiv").addClass("error"); } } But nothing changes? Do you have some ideas?

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  • Handling Email Bouncebacks in Rails

    - by aressidi
    Hi there, I've built a very basic CRM system for my rails app that allows me to send weekly user activity digests with custom text and create multi-part marketing messages which I can configure and send through a basic admin interface. I'm happy with what I've put together on the send-side of things (minus the fact that I haven't tried to volume test its capabilities), but I'm concerned about how to handle bounce-backs. I came across this plugin with associated scripts: http://github.com/kovyrin/bounces-handler I'm using Google Apps to handle my mail and really don't know enough about Perl to want to mess with the above plugin - I have enough headaches. I'm looking for a simple solution for processing bounce-backs in Rails. All my email will go out from an address like this which will be managed in Google Apps: "[email protected]." What's the best workflow for this? Can anyone post an example solution they're using keeping in mind the fact that I'm using Google Apps for the mail? Any guidance, links, or basic workflow best-practices to handle this would be greatly appreciated. Thanks! -A

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  • Would there be a market for this idea (cross platform VM for iPhone OS)

    - by Tzury Bar Yochay
    For a long time I wondered if the following idea worth a nickel or just a waste of time and energy. I am willing to start a project which will provide a kind of a VM for all iPxxx apps - so developed once for iPxxx can run on a Macbook, iMac, Linux, Android and windows (desktop and mobile). You get the idea, right? I want to do to the current iPhone SDK, the same as what Mono did to Microsoft .Net and perhaps a more complete set of implementation. I tend to believe that if overnight all apps on appstore become available on the android market as well that would be a mini revolution. Think about running iPad apps on every tablet that will come out to the market in the future. Wouldn't it be fantastic to all the developers, which from now on, can write once and sell everywhere? The main questions which I ask myself repeatedly is: "Is This Legal?" - I mean, say I have done this, would apple's lawyers will start sending me all kinds of nasty emails? I am willing to hear your opinion about this idea as well as if some of you willing and able to join forces and start this open source project.

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  • How can I create an array of random numbers in C++

    - by Nick
    Instead of The ELEMENTS being 25 is there a way to randomly generate a large array of elements....10000, 100000, or even 1000000 elements and then use my insertion sort algorithms. I am trying to have a large array of elements and use insertion sort to put them in order and then also in reverse order. Next I used clock() in the time.h file to figure out the run time of each algorithm. I am trying to test with a large amount of numbers. #define ELEMENTS 25 void insertion_sort(int x[],int length); void insertion_sort_reverse(int x[],int length); int main() { clock_t tStart = clock(); int B[ELEMENTS]={4,2,5,6,1,3,17,14,67,45,32,66,88, 78,69,92,93,21,25,23,71,61,59,60,30}; int x; cout<<"Not Sorted: "<<endl; for(x=0;x<ELEMENTS;x++) cout<<B[x]<<endl; insertion_sort(B,ELEMENTS); cout <<"Sorted Normal: "<<endl; for(x=0;x<ELEMENTS;x++) cout<< B[x] <<endl; insertion_sort_reverse(B,ELEMENTS); cout <<"Sorted Reverse: "<<endl; for(x=0;x<ELEMENTS;x++) cout<< B[x] <<endl; double seconds = clock() / double(CLK_TCK); cout << "This program has been running for " << seconds << " seconds." << endl; system("pause"); return 0; }

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  • Upgraded Eclipse. Every app force closes

    - by user1309500
    I would be really grateful for some urgent advice:- I was merrily building my apps (using eclipse) for Android platform 2.2. Everything all working lovely and ready to upload to the marketplace. I thought I would try to install Google Play Licensing and in the process, I was told to download the LVL but that was not available in my SDK download list - and I read I had to updrage my SDK and ADT to the latest. So I did, I now have: ADT 17.0.0 along with ANDROID DDMS, hierarchy viewer and Traceview at 17.0.0 with Eclipse IDE 1.4.2 And I also upgraded my SDK Android 2.2 stuff to the latest. Now:- I have no errors in my app workplaces on Eclipse. But now when I run the apps, they build but force close straight away upon loading. This includes the app I was working on (and working perfectly before) and all the other apps I have ever made. Every app now force closes and I dont know what to do. Been up all night and was ready to upload them to the market place... :( Any help!? Thanks! Please!

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  • jQuery - Show id, based on selected items class?

    - by Jon Hadley
    I have a layout roughly as follows: <div id="foo"> <!-- a bunch of content --> </div> <div id="thumbnails"> <div class="thumb-content1"></div> <div class="thumb-content2"></div> <div class="thumb-content3"></div> </div> <div id="content-1"> <!-- some text and pictures, including large-pic1 --> </div> <div id="content-2"> <!-- some text and pictures, including large-pic2 --> </div> <div id="content-3"> <!-- some text and pictures, including large-pic3 --> </div> etc .... On page load I want to show 'foo' and 'thumbnails' and hide the three content divs. As the user clicks each thumbnail, I want to hide foo, and replace it with the matching 'content-x'. I can get my head round jQuery show, hide and replace (although, bonus points if you want to include that in your example!). But how would I extract and construct the appropriate content id, from the thumbnail class, then pass it to the show hide code?

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  • Windows 7: how to let AutoConfigURL change be effective immediately?

    - by Jeroen Pluimers
    I want to set both the script and the "Use automatic configuration script" checkbox in Windows 7 using a script that immediately affects anything using wininet.dll (Internet Explorer, Chrome, .NET apps, etc). I've done a before/after registry diff, and tried doing this through the registry, but things like the reg files below require the apps to be restarted. Chaning the settings by pressing the "LAN Settings" button through this Control panel shortcut has immediate affect: %windir%\system32\control.exe Inetcpl.cpl,,4 How can I script this immediate effect? These are the registry script files: [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings] “AutoConfigURL”=”http://www.company.com/proxy.pac” (registry scripts borrowed from http://danny.quantumspark.net/wordpress/) [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings] “AutoConfigURL”=- --jeroen (who is checking out the notify function at superuser.com)

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  • Is it possible to update from Windows 8 Enterprise to version 8.1 without having to reinstall the OS?

    - by foregon
    Today we are told that the 8.1 update, (a version which allows you to keep apps, settings, and files), is officially being rolled out worldwide. No longer will you have to do a clean OS install, to go from 8 to 8.1. But I don't see the update inside my (Enterprise's) desktop 'Windows Update' program, and furthermore, Microsoft themselves say: If you’re running [Enterprise], you can't install the free update to Windows 8.1 or Windows RT 8.1 from the Store. However they DO also say: If you installed Windows 8 using an MSDN ISO, you might be able to install Windows 8.1 using a similar ISO from MSDN But it does not specify whether this method allows seamless apps and settings-retaining upgrading or not. Is there a method for doing it (whether official or unofficial - perhaps confirmed via experience of updating with some sort of Enterprise 8.1 ISO), or is an update indeed expected for the Enterprise version via the desktop 'Windows Update' program? A further observation which may help: the page I cite refers to the 'Windows Store', which is the 'Modern UI' app store and NOT the desktop 'Windows Update' program which typically updates desktop Office and desktop Windows alike.

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  • Throttle network bandwidth per application in Mac OS X

    - by Kio Dane
    I notice that iTunes seems to suck up all my bandwidth and doesn’t play nice with other applications that use the web when it's downloading. In fact, it doesn't even give itself enough bandwidth when browsing the iTunes Store while downloading large or many files (podcasts, TV shows, large apps, etc). I'm not concerned with getting all my downloads as soon as possible, they're really low priority, and I'd rather not have to do this while I'm awake, but I can't hit the refresh button if I'm in bed and forgot it already. Is there an application or tool via the Terminal to limit the download bandwidth that iTunes gets without also hindering web browsers or other applications? FOSS/GPL software is preferable, but pay software might be acceptable too.

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  • Minimizing SQL transaction log file size on developer box running simple recovery model

    - by Anders Rask
    We have alot of SQL servers on development environment where we never take backup of the databases (TFS for code is enough). The (SharePoint) databases are all set to simple recovery model, but the log files, especially for the SharePoint configuration database is growing quite large and filling up our data drive on the SQL server. Since these log files are never used for anything, i would like advice on how to best minimize the size of these log files -or even disable them if possible. I'm not completely sure why the log files grow so large even on simple logging (checked for long running transactions (DBCC OPENTRAN) but found none). I guess the reason for the log files not being truncated is, that we dont take any backups, and hence Checkpoints arent reached. The autogrowth for log files are set to autogrow by 10% restricted to 2 gb, so i guess that is why Checkpoint (70%) arent reached here either. What would be the be best strategy to keep log files small (best case 0) without sacrificing performance (eg VLF fragmentation)?

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  • disparity between `top`'s given CPU % and process CPU usage total

    - by intuited
    I've noticed that there are sometimes (large) differences between the reported total CPU usage and a summation of the per-process CPU utilization given by apps like top and wmtop. As an example: I recently ran a git filter-branch --index-filter on a fairly large repo, with the index-filter command piping git ls-files through a grep filter and into xargs git rm --cached. This took a few minutes to run; while it was going I noticed that both wmtop and top were displaying a high (above 50% on my 2-core machine) total CPU usage, but that neither showed any individual processes which were using a significant amount of CPU time. Are some processes not shown in the process list? What sorts of processes are these, and is there a way to find out how much CPU time they are using?

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  • What is a ‘best practice’ backup plan for a website?

    - by HollerTrain
    I have a website which is very large and has a large user-base. I am trying to think of a 'best practice' way to create a back up or mirror website, so if something happens on domain.com, I can quickly point the site to backup.domain.com via 401 redirect. This would give me time to troubleshoot domain.com while everyone is viewing backup.domain.com and not knowing the difference. Is my method the ideal method, or have you enacted better methods to creating a backup site? I don't want to have the site go down and then get yelled at every minute while I'm trying to fix it. Ideally I would just 'flip the switch' and it would redirect the user to a backup. Any insight would be greatly appreciated.

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  • MOSS Upload Size?

    - by littlegeek
    Hi In MOSS we have done all of this to increase the file upload size, reset iis but still doesnt want to play = anyone any advice. UPDATE Just seen the Scott Gu article - http://weblogs.asp.net/pscott/archive/2009/02/26/404-errors-with-fileupload-with-iis7.aspx and JS example http://msmvps.com/blogs/cgross/archive/2009/02/25/large-files-in-sbs-2008-s-companyweb.aspx So need to say this is II6 on win2k3 Update 2 still not working at a loss anyone help? In SharePoint 3.0 Central Adminisration, Application Management tab, and Web application general settings configure the Maximum upload size to a maximum of 2047 MB. - We set ours to 250MB In Internet Information Services on the properties of the virtual server increase the Connection Timeout to greater than default 120 seconds depending on the time to upload large files in your environment for example, 360 seconds. - We set ours to 600 Secs Configure the web.config for the _layouts web.config with On the SharePoint server change C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\TEMPLATE\LAYOUTS\web.config with an executionTimeout appropriate for the file size you are uploading. An example is included below. from: to: executionTimeout="999999" maxRequestLength="2097151" /

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  • Converting a GMail Label Mailbox to a Set of PDFs

    - by Aldrin Leal
    I do have a rather large task to do: I need to convert a folder in my gmail with lots of tagged messages either as a large PDF (which Adobe Acrobat does on Outlook - Except the latter crashes while loading this mailbox) or as a individual PDF (which I plan to link on a Wiki Database) While it doesn't fully need to be in PDF (as long as I can, say, outsource to someone else to convert each .eml file as a .pdf file), I need to have them splitted so I could cross-reference them on a Wiki. What would you suggest to accomplish this task? Thank you.

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  • DNS Round-robin failover and load balancing

    - by Tom O'Connor
    Having read all of the questions and answers (1 2 3 and so on) on here relating to DNS load balancing, and Round-robin DNS, there's still a number of unanswered questions.. Large companies, and I'm looking at Google, Facebook and Twitter here, do present multiple A records. 1) If DNS loadbalancing/failover is so dodgy, why do large organisations do it? There seems to be very little mention of "DNS Pinning", despite this (PDF) paper about it. 2) Why is DNS Pinning so seldom mentioned? 3) Are there any concrete examples of which ISPs and so on actually do rewrite DNS TTLs? That said, I'm not entirely backing the side for using DNS for failover or any form of load balancing. For most networks, BGP diverse routing still seems to be a better fit. DNS rears it's ugly head again. :(

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  • Copying files from NAS to NAS drives

    - by user1001421
    Very simple question. I've got 2 NAS drive that are "wire" connected via a router. If I have a wireless laptop and request a large amount of data be copied from one NAS drive to the other, does the network traffic go direct from the one drive to the other, going via the wired network, or does the network traffic go via my laptop, if you see what I mean. IE. From the NAS drives wired network, to the wireless network and then back to the wired network. Is this a common bottle-neck when copying a large amount of data? And if so, is there a way to avoid it. Thanks.

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  • Automating the choice between JPEG and PNG with a script

    - by MHC
    Choosing the right format to save your images in is crucial for preserving image quality and reducing artifacts. Different formats follow different compression methods and come with their own set of advantages and disadvantages. JPG, for instance is suited for real life photographs that are rich in color gradients. The lossless PNG, on the other hand, is far superior when it comes to schematic figures: Picking the right format can be a chore when working with a large number of files. That's why I would love to find a way to automate it. A little bit of background on my particular use case: I am working on a number of handouts for a series of lectures at my unversity. The handouts are rich in figures, which I have to extract from PDF-formatted slides. Extracting these images gives me lossless PNGs, which are needlessly large at times. Converting these particular files to JPEG can reduce their size to up to less than 20% of their original file size, while maintaining the same quality. This is important as working with hundreds of large images in word processors is pretty crash-prone. Batch converting all extracted PNGs to JPEGs is not an option I am willing to follow, as many if not most images are better suited to be formatted as PNGs. Converting these would result in insignificant size reductions and sometimes even increases in filesize - that's at least what my test runs showed. What we can take from this is that file size after compression can serve as an indicator on what format is suited best for a particular image. It's not a particularly accurate predictor, but works well enough. So why not use it in form of a script: I included inotifywait because I would prefer for the script be executed automatically as soon as I drag an extracted image into a folder. This is a simpler version of the script that I've been using for the last couple of weeks: #!/bin/bash inotifywait -m --format "%w%f" --exclude '.jpg' -r -e create -e moved_to --fromfile '/home/MHC/.scripts/Workflow/Conversion/include_inotifywait' | while read file; do mogrify -format jpg -quality 92 "$file" done The advanced version of the script would have to be able to handle spaces in file names and directory names preserve the original file names flatten PNG images if an alpha value is set compare the file size between the temporary converted image and its original determine if the difference is greater than a given precentage act accordingly The actual conversion could be done with imagemagick tools: convert -quality 92 -flatten -background white file.png file.jpg Unfortunately, my bash skills aren't even close to advanced enough to convert the scheme above into an actual script, but I am sure many of you can. My reputation points on here are pretty low, but I will gladly award the most helpful answer with the highest bounty I can set. References: http://www.formortals.com/introducing-cnb-imageguide/, http://www.turnkeylinux.org/blog/png-vs-jpg Edit: Also see my comments below for some more information on why I think this script would be the best solution to the problem I am facing.

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  • Vim is spellchecking in XML files where I don't want it to, and only there

    - by Kazark
    I'm trying to use Vim's builtin spellchecking in some XML documents. This happens merely by having the XML syntax loaded, as seen in the following minimalistic example (which reproduces what I also see in large XML documents): Note that given two buffers with exactly the same content, when Filetype is text, the spellchecking works; when it is xml, it does not. spell is set in both buffers. However, given this view of the top three lines of a large XML document, you can see that the spellchecking is certainly on: but it is only checking attributes. The nuisance is that none of the things it is actually finding are mispelled, and it isn't finding any of the numerous misspellings in the document. I would like it at a minimum to find the spelling errors in the body of the document, and being able to turn off the checking on attributes would be a nice option. I've searched for @NoSpell in the xml.vim file, but that returns no hits.

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  • Which linux distro for a laptop in windows environmet?

    - by Dev er dev
    I just got new laptop at work. What would you recommend as a linux distribution for it? All other developers are working under windows, and use windows tools. I'm currently using ArchLinux, but want to change it. I don't want to waste time configuring wireless, windows network shares, network pritners, projector, etc ... I want this stuff to just work, while still having sane and stable development evironment and tools. Is Ubuntu a good choice for this? I use gentoo at home, but don't think it is a good match for work environmet. EDIT: Note that we are working on cross platform apps, and deployment platform is almost always linux. There are very few windows apps that I have to use (like MS Project). It is just that everything else is windows centric. I use linux because I feel more productive with it, even if I have to dual boot to edit MS Project files.

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