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  • Handling database failover for Rails applications on FreeBSD

    - by bianster
    I'm working on implementing database (Postgresql) failover for a Rails app that runs with Passenger/FreeBSD. Due to certain constraints regarding the server OS, it's necessary to continue using FreeBSD (as opposed to say, Ubuntu). I'm finding it to be quite a challenge to have failover handled within the Rails application, by way of a customised database adapter due to the fact that this application will be load-balanced between several webservers, and the multiple Rails processes that Passenger spawned in each webserver. I previously looked at setting up Pacemaker/Corosync to manage database server failover on a common IP but unfortunately I wasn't able to get past building the packages on FreeBSD. It does work rather well on Ubuntu 10.04 but I'm not likely to be able to use Ubuntu due to the OS constraints. I'm considering a custom witness daemon that simply pings the primary DB server, and this witness daemon switches all the webservers to the standby DB server when the primary becomes uncontactable (permanently/temporarily), to avoid split-brain. Though I would really like to know if there is a way to get Pacemaker(or something similar) to do the switch on FreeBSD.

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  • Data Processing in Business Intelligence Applications

    - by Manoj
    Is data processing a part of business intelligence tools? If no how else is it done or if yes can you give a few examples. My use case: I am using pentaho reporting to generate tables and graphs of my test data. Now I want to compare the data against the spec and see if it passes or fails and report the same. The spec is also in the database. How best to do it?

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  • Using SketchFlow to prototype MS Surface Applications

    - by Isak Savo
    Hi We're doing mockups/prototyping on a MS Surface device and I wonder if anyone has succeeded in using SketchFlow for this. The problem that I see is that the code generated by the tool uses normal WPF controls (Button, etc.) instead of the contact aware surface counterparts (SurfaceButton) which means that they won't work nice on the surface unless you also use a mouse. Additionally, it would be nice if it was possible to hook in to other gesture events to trigger sketchflow transitions. Like the pinch gestures to switch page etc. Has anyone had any success with prototyping for Surface using Sketchflow. If so, how did you do it?

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  • Open Source Embedded Database Options for .Net Applications

    - by LonnieBest
    I have a .Net 4.0 WPF application that requires an embedded database. MS Access doesn't work on 64 bit Windows I'm told. And I having issues with SSCE: Unable to load DLL 'sqlceme35.dll': This application has failed to start because the application configuration is incorrect. Reinstalling the application may fix this problem. (Exception from HRESULT: 0x800736B1) sqlceme35.dll is installed into my application's program files directory, so I can't seem to figure out why Windows XP Pro doesn't see it. I was wondering about other embedded databases options I might use that work on both 32 and 64 bit windows. Any suggestions?

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  • Best way to represent Gender in a class library used in multilingual applications

    - by Hauge
    I'm creating class library with some commonly used classes like persons, addresses etc. This library will be used in an multilingual application, and I am looking for the most convenient way to represent a persons gender. Ideally I would like to be able to code like this: Person person = new Person { Gender = Genders.Male, FirstName = "Nice", LastName = "Dude" } if (person.Gender == Genders.Male) Console.WriteLine("person is Male"); Console.WriteLine(person.Gender); //Should output: Male Console.WriteLine(person.Gender.ToString("da-DK")); //Should output the name of the gender in the language provided List<Gender> genders = Genders.GetAll(); foreach(Gender gender in genders) { Console.WriteLine(gender.ToString()); Console.WriteLine(gender.ToString("da-DK")); } What would you do? An enumeration and a specialized Gender class, but what about the localization then? Regards Jesper Hauge

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  • Technologies used in Remote Administration applications(not RD)

    - by Michael
    I want to know what kind of technologies are used nowadays as underlying screen capture engine for remote administration software like VNC pcAnywhere TeamViewer RAC Remote Administrator etc.. The programming language is not so important as just to know whether a driver needs to be developed which is polling video memory 30 times per second or there are any com objects built in the Windows kernel to help doing this? I'm not interested in 3rd party components for doing this. Do I have to use DirectX facilities? Just want some start point to develop my own screen stream capture engine, which will be less CPU hog.

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  • Firebug not showing Javascript errors for Rails applications

    - by 99miles
    I have a Rails application, and when I have Javascript errors they are not showing in the Firebug console. I have 'Show javascript errors' and 'Show javascript warnings' selected. When I insert javascript errors in a basic html file, the errors show as expected. In the javascript of the Rails app, it only shows errors in rare cases. For example i can insert nonsense like: dfghaefb; and no error is shown in Firebug. But if i insert a space in there Firebug does show the error: dfgh aefb; Any ideas? This is driving me nuts.

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  • How to Develop CPython Applications With Visual Studio?

    - by user213060
    I would like to know how to use Visual Studio with CPython (the official python.org python interpreter, not IronPython). In particular, I am interested in getting "build" and "run" commands in Visual Studio working. Other features such as color highlighting and auto-complete, I am less concerned about. Also, can the "build" command be made to run py2exe or similar exe packagers?

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  • Can 2 different applications use the same database?

    - by cdonner
    Without additional context, the answer is "no", I think. Here is the context. I want to have a free version and a premium version of the same application. When people buy the application, I want them to be able to "upgrade" without losing their data, i.e. the premium version should install over the free version. I want to use the same code base and just switch a setting to build the premium version. Andoid Market does not let me convert a free app to a paid app, so the trivial option is not available. I am curious if someone has tried this successfully. How does Android Market identify an application - will it think that the premium version is a different app and just install it in parallel?

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  • Howto start writing iPad applications?

    - by Lothar
    I know Objective-C from Desktop Apple Programming. But i want to jump on the iPad bandwagon and start developing some small edutainment applets. Is the iPad API the same as iPhone just with more power? Do i need to join the iPhone developer program and does it still start with $100. Is there any iPad emulator yet?

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  • Validating Application Settings Key Values in Isolated Storage for Windows Phone Applications

    - by Martin Anderson
    Hello everyone. I am very new at all this c# Windows Phone programming, so this is most probably a dumb question, but I need to know anywho... IsolatedStorageSettings appSettings = IsolatedStorageSettings.ApplicationSettings; if (!appSettings.Contains("isFirstRun")) { firstrunCheckBox.Opacity = 0.5; MessageBox.Show("isFirstRun not found - creating as true"); appSettings.Add("isFirstRun", "true"); appSettings.Save(); firstrunCheckBox.Opacity = 1; firstrunCheckBox.IsChecked = true; } else { if (appSettings["isFirstRun"] == "true") { firstrunCheckBox.Opacity = 1; firstrunCheckBox.IsChecked = true; } else if (appSettings["isFirstRun"] == "false") { firstrunCheckBox.Opacity = 1; firstrunCheckBox.IsChecked = false; } else { firstrunCheckBox.Opacity = 0.5; } } I am trying to firstly check if there is a specific key in my Application Settings Isolated Storage, and then wish to make a CheckBox appear checked or unchecked depending on if the value for that key is "true" or "false". Also I am defaulting the opacity of the checkbox to 0.5 opacity when no action is taken upon it. With the code I have, I get the warnings Possible unintended reference comparison; to get a value comparison, cast the left hand side to type 'string' Can someone tell me what I am doing wrong. I have explored storing data in an Isolated Storage txt file, and that worked, I am now trying Application Settings, and will finally try to download and store an xml file, as well as create and store user settings into an xml file. I want to try understand all the options open to me, and use which ever runs better and quicker

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  • Cannot run/debug Java applications in Eclipse (JavaTimeZone issue)

    - by Andre
    I'm trying to get started with Eclipse/Java/Scala on a MacBook. The installed JDK was 1.5. The SDT plugin for Scala requires 1.6 which was included in an OS update, but I also manually installed a package from Apple to update 1.6. The problem is that I cannot run anything from Eclipse. I always get the following error: An internal error occurred during: "Launching TestFooBasicTest". Could not initialize class com.ibm.icu.impl.JavaTimeZone I also tried to use the old 1.5 version, but to no avail. What is going wrong here?

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  • Create a template mechanism in Objective-C for iPad applications

    - by Flex_Addicted
    I'm looking for a solution to create a sort of template in Objective C. I'll try to explain my problem. I would create a sort of main view which has 1 side bar that remain always visible. This side bar have controls. The main view is responsible to load a Navigation Controller (UINavigationController seems to be ok) that manages other views. When switching a view to another, the sidebar always remain visible under the Navigation Controller and its views. Through the controls of the sidebar, it's possible to send event to a specific view loaded by the Navigation Controller. Any idea to create a similar template? Thank you. Best regards.

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  • Working with android and ant scripts for building applications

    - by y ramesh rao
    I want to know if we can create builds using ant's build.xml and when i'm trying to do this an error is displayed SDK location not mentioned and besides that I'm unable to find local.properties file to mention the SDK Location My aim is that I want to use my exiting code and make a build for new Android SDK's with changes in the resources and and some constant values is this task Possible with making a build using Ant and if by some other way. I have no idea about Ant and its functioning so it would very appreciable if minute details are also provided.

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  • ASP.NET MVC solution to a forms application?

    - by Gloria Huang
    Hello, We're building a survey system and utilising ASP.NET MVC and wondered if anyone can offer suggestions on the architecture. Here's the problem we're trying to solve. Essentially an agency sends out several surveys every year. They're very structured and not like SurveyMonkey style of surveys - they're actually applications of feedback. Much like a Visa Application there are lots of things they need to do and sometimes it takes them 2-3 weeks to fill it out. They can upload files (proofs of purchase etc - PDF/JPG) and also multiple "items". Eg. Say for instance they've worked for McDonalds, there could be 20 different franchises, they build a list of locations they've worked. 3 weeks later there could be another 3 new locations and 2 may have closed down. So we need to ensure the forms are able to handle those situations. The forms themselves (markup and data) change every year - I should mention that this for a taxation/finance/budget system. We were thinking of using MVC, using Xml to store the data (temporarily), XSD to validate the data, XSL to transform the data to presentable markup (for them to fill out) and then once they "Submit" an application it gets stored into the DB in relevant areas. When the user starts the application process, they can save the progress so far (we validate whatever they entred and ignore any they havent), save it as an Xml blob and store in the DB. When they're finally ready to submit it, then we do a full validation and upload the files and store them securely (it has their business proofs and accounting statements) and then run some workflows. What I'm really concerned about is how to manage changing forms versions (a year later). How are form/application systems written these days? We have 2 months to pull this off and about 30 forms to deliver. So 30xXML, 30xXSD, 30xXSL.

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  • Facebook Sidebar/Tab Applications

    - by James
    Been searching the FB documentation to find an answer for this, but have been unsuccessful. Is an application able to appear as a tab on a page/profile, and also in the sidebar of that same page/profile? So the tab would show the full application details, but the sidebar would give a small breakdown. Is this possible? Thanks!

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  • Reducing piracy of iPhone applications

    - by Alex Reynolds
    What are accepted methods to reduce iPhone application piracy, which do not violate Apple's evaluation process? If my application "phones home" to provide the unique device ID on which it runs, what other information would I need to collect (e.g., the Apple ID used to purchase the application) to create a valid registration token that authorizes use of the application? Likewise, what code would I use to access that extra data? What seem to be the best available technical approaches to this problem, at the present time? (Please refrain from non-programming answers about how piracy is inevitable, etc.)

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  • Installing applications OTA

    - by Ed Marty
    I have a system set up to download jad files on users' Blackberries, but it only works intermittently, and seemingly randomly. If the user clicks on the link within their BlackBerry browser, 95% of the time on the first try an error message will pop up saying there was an HTTP 500 error (which our server never returns). Viewing the details of this message within the blackberry browser, it says nothing but java.lang.nullpointerexception which, again, could not have come from our server (running apache/php). However, if the user clicks on the link a few more times, or navigates away and goes back to that page, it suddenly works. No change on the server, it just shows the application install screen. Unfortunately, this doesn't always work; sometimes the error 500 just keeps showing up. The link is rather long (containing an sha hash as a token as part of the URL), but I would think that a long URL would either always be broken or always work, not work intermittently. The link uses a php script to download the jad and cod files. Linking to the files directly rather than using the script seems to work more often (I haven't determined if that also ever has an error 500 or not), but I can't find any issues with the headers. The content type is set correctly and, like I said, if the headers were an issue, I'd think it would either always work or always break. Any clues?

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  • How to protect copyright on large web applications?

    - by Saif Bechan
    Recently I have read about Myows, described as "the universal copyright management and protection app for smart creatives". It is used to protect copyright and more. Currently I am working on a large web application which is in late testing phase. Because of the complexity of the app there are not many versions of it online so copyright will be a huge issue for me as much of the code is in JavaScript and is easy copyable. I was glad to see that there is some company out there that provide such services, and naturally I wanted to know if there were people using it. I did not know that this type of concept was so new. Is protecting copyright a good idea for a large web application? If so, do you think Myows will be worth using, or are there better ways to achieve that? Update: Wow, there is no better person to have answered this question like the creator himself. There were some nice points made in the answer, and I think it will be a good service for people like me. In the next couple of weeks I will be looking further into the subject and start uploading my code and see how it works out. I will leave this question up because I do want some more suggestions on this topic.

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  • Launch Condition to Detect Office 2010 Applications

    - by Amitd
    Hi , I was trying to create a setup project using VS2008. Is there anyway to detect if a particular Office 2010 application is installed or not? (as a prerequisite) .eg: i want to detect if Powerpoint 2010 is installed on client machine. I was trying to use windows installer search option in lauch condition but unable to find what is component id of powerpoint 2010? Are there any more ways to detect the same? (can be programmatic)

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