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  • Advice on designing web application with a 40+ year lifetime

    - by user2708395
    Scenario Currently, I am apart of a health care project whose main requirement is to capture data with unknown attributes using user generated forms by health care providers. The second requirement is that data integrity is key and that the application will be used for 40+ years. We are currently migrating the client's data from the past 40 years from various sources (Paper, Excel, Access, etc...) to the database. Future requirements are: Workflow management of forms Schedule management of forms Security/Role based management Reporting engine Mobile/Tablet support Situation Only 6 months in, the current (contracted) architect/senior programmer has taken the "fast" approach and has designed a poor system. The database is not normalized, the code is coupled, the tiers have no dedicated purpose and data is starting to go missing since he has designed some beans to perform "deletes" on the database. The code base is extremely bloated and there are jobs just to synchronize data since the database is not normalized. His approach has been to rely on backup jobs to restore missing data and doesn't seem to believe in re-factoring. Having presented my findings to the PM, the architect will be removed when his contract ends. I have been given the task to re-architect this application. My team consists of me and one junior programmer. We have no other resources. We have been granted a 6-month requirement freeze in which we can focus on re-building this system. I suggested using a CMS system like Drupal, but for policy reasons at the client's organization, the system must be built from scratch. This is the first time that I will be designing a system with a 40+ lifespan. I have only worked on projects with 3-5 year lifespans, so this situation is very new, yet exciting. Questions What design considerations will make the system more "future proof"? What experiences have you had in designing such systems - both failures and successes? What questions should be asked to the client/PM to make the system more "future proof"?

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  • Run external application on markdown source in ikiwiki

    - by student
    Can I add a button to each wiki page in ikiwiki which launches an external application (on the client side) or script with the markdown code of the current page as input? Edit: I didn't realize that it might be complicated to do it on client side as Zenklys' answer suggested. So perhaps I should describe more concretely what I have in mind: I want to have two buttons: "Get LaTeX" and 2. "Get pdf". Clicking on "Get LaTeX should generate a LaTeX file and the browser should simply open or download that file. Analogously for the pdf. It would even be ok, to have a button "Generate LaTeX" instead, which generates the LaTeX code and changes after the generation to "Get LaTeX" which simply points to the LaTeX file. So it is not really necessary to do the generation of the files on client side. Would be ok, if this is done (on a temporary folder) on server side. For the LaTeX resp. pdf generation I want to use a custom wrapper script for pandoc, let's call it mymarkdown2latex resp. mymarkdown2pdf.

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  • Is it viable to make a port from a C++ application to Java through LLVM

    - by Javier Mr
    how viable is it to port a C++ application to Java bytecode using LLVM (I guess LLJVM)? The thing is that we currently have a process written in C++ but a new client has made mandatory to been able to run the program in a multiplatform way, using the Java Virtual Machine with obviously no native code (no JNI). The idea is to be able to take the generated jar and copy then to different systems (Linux, Win, 32 bits - 64 bits) and it should just work. Looking around looks like it is possible to compile C++ to LLVM IR code and then that code to java bytecode. There is no need of the generated code to be readable. I have test a bit with similar things using emscripten, this takes C++ code and compile it to JavaScript. The result is valid JS but totally unreadable (looks like assambler). Does anybody done a port of an application from C++ to Java bytecode using this tecnique? What problems could we face? Is a valid approach for production code? Note: I am aware that currently we have some non standard C++ and close source libraries, we are looking to removing this non standard code and all close source libraries and use Free Libre Open Source Software, so lets suppose all code is standard C++ code with all code available at compile time. Note: It is not an option to write portable C++ code and then compile it to the desired target platform, the compiled program must be mltiplatform thus the use of JVM (right now we are not looking in similar solutions but Python or other language base, but i would also like to heard about it)

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  • How to choose between using a Domain Event, or letting the application layer orchestrate everything

    - by Mr Happy
    I'm setting my first steps into domain driven design, bought the blue book and all, and I find myself seeing three ways to implement a certain solution. For the record: I'm not using CQRS or Event Sourcing. Let's say a user request comes into the application service layer. The business logic for that request is (for whatever reason) separated into a method on an entity, and a method on a domain service. How should I go about calling those methods? The options I have gathered so far are: Let the application service call both methods Use method injection/double dispatch to inject the domain service into the entity, letting the entity do it's thing and then let it call the method of the domain service (or the other way around, letting the domain service call the method on the entity) Raise a domain event in the entity method, a handler of which calls the domain service. (The kind of domain events I'm talking about are: http://www.udidahan.com/2009/06/14/domain-events-salvation/) I think these are all viable, but I'm unable to choose between them. I've been thinking about this a long time and I've come to a point where I no longer see the semantic differences between the three. Do you know of some guidelines when to use what?

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  • Auto-starting a GUI application that requires sudo

    - by nanostuff
    Question: I need to auto-start a GUI application that requires sudo. I know I need to edit the sudoers file with: sudo visudo However, I don't know what to write in the file. What I already tried: sudo visudo and then added the following: nanostuff ALL = NOPASSWD: /usr/lib/AirVPN/AirVPN.exe I also tried with: nanostuff ALL = NOPASSWD /usr/bin/X11/airvpn and nanostuff ALL = NOPASSWD /usr/bin/airvpn None of those worked. By doing: ps aux | grep airvpn I get the following output: nanostuff 6805 0.2 0.4 483520 17384 ? Sl 17:13 0:01 /usr/bin/gksu -u root -m AirVPN Client needs administrative privileges. Please enter your password. mono /usr/lib/AirVPN/AirVPN.exe path=/home/nanostuff/.airvpn root 6806 0.0 0.0 78604 2392 ? Ss 17:13 0:00 /usr/bin/sudo -H -S -p GNOME_SUDO_PASS -u root -- mono /usr/lib/AirVPN/AirVPN.exe path=/home/nanostuff/.airvpn root 6808 3.2 2.0 1257532 83032 ? Sl 17:13 0:12 mono /usr/lib/AirVPN/AirVPN.exe path=/home/nanostuff/.airvpn root 6832 0.0 0.0 22652 3336 ? S 17:14 0:00 /usr/sbin/openvpn --config /home/nanostuff/.airvpn/384ef91f85df5ea2abc88c7416b95bbdf2bc4299edd2850614d4e343ba721ae3.tmp.ovpn nanostuff 6951 0.0 0.0 18932 932 pts/2 S+ 17:20 0:00 grep --color=auto airvpn Additional info: OS: Ubuntu 14.04 64bits Application: It's a VPN client

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  • Pinning a Java application to the Windows 7 taskbar

    - by Paul Lammertsma
    Original question I use Launch4j as a wrapper for my Java application under Windows 7, which, to my understanding, in essence forks an instance of javaw.exe that in turn interprets the Java code. As a result, when attempting to pin my application to the task bar, Windows instead pins javaw.exe. Without the required command line, my application will then not run. As you can see, Windows also does not realize that Java is the host application: the application itself is described as "Java(TM) Platform SE binary". I have tried altering the registry key HKEY_CLASSES_ROOT\Applications\javaw.exe to add the value IsHostApp. This alters the behavior by disabling pinning of my application altogether; clearly not what I want. After reading about how Windows interprets instances of a single application (and a phenomenon discussed in this question), I became interested in embedding a Application User Model ID (AppUserModelID) into my Java application. I believe that I can resolve this by passing a unique AppUserModelID to Windows. There is a shell32 method for this, SetAppID(). (Or SetCurrentProcessExplicitAppUserModelID?) Is it possible to call it via JNI? If so, would this even resolve the issue? On a side note, I was curious if any of the APIs discussed in this article could be implemented for a Java application. Edit after implementing JNA, as Gregory Pakosz suggested I've now implemented the following in an attempt to have my application recognized as a separate instance of javaw.exe: NativeLibrary lib; try { lib = NativeLibrary.getInstance("shell32"); } catch (Error e) { Logger.out.error("Could not load Shell32 library."); return; } Object[] args = { "Vendor.MyJavaApplication" }; String functionName = "SetCurrentProcessExplicitAppUserModelID"; try { Function function = lib.getFunction(functionName); int ret = function.invokeInt(args); if (ret != 0) { Logger.out.error(function.getName() + " returned error code " + ret + "."); } } catch (UnsatisfiedLinkError e) { Logger.out.error(functionName + " was not found in " + lib.getFile().getName() + "."); // Function not supported } This appears to have no effect, but the function returns without error. Diagnosing why is something of a mystery to me. Any suggestions? Working implementation The final implementation that worked is the answer to my follow-up question concerning how to pass the AppID using JNA. I had awarded the bounty to Gregory Pakosz' brilliant answer for JNI that set me on the right track.

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  • Brief white screen when loading PHP page?

    - by orbit82
    What would cause a brief flash of white screen while a PHP page is loading? I just noticed it today on a WordPress theme that I am building and am wondering if this is a cause for concern. As a page loads, the screen will flash white before showing the page content. Sometimes this happens on every single page load, other times it only happens intermittently.

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  • Full page border | CSS

    - by Wayne
    Isn't there a CSS way of having the page to get a border around the page, even if the content was not big enough for the page to scroll and there's still a border around the page. I think I remember I saw one CSS method before was like something something, I don't know, do you know? lol If you know, many thanks :)

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  • not able to close the jquery iframe thickbox when the page is https

    - by Sourabh
    I have jQuery thickbox(TB_iframe=true) which shows an https page in an iframe based overlay. the parent page is http & overlay page is https.if i use self.parent.tb_remove() This does not work and gives me Permission denied for https://www.abc.com to get property Window.tb_remove from http://www.abc.com. Any solution. I want to be able to close the thikbox irrespective to whether its is https or http page that it is displaying in an iframe.

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  • System architecture: simple approach for setting up background tasks behind a web application -- wil

    - by Tim Molendijk
    I have a Django web application and I have some tasks that should operate (or actually: be initiated) on the background. The application is deployed as follows: apache2-mpm-worker; mod_wsgi in daemon mode (1 process, 15 threads). The background tasks have the following characteristics: they need to operate in a regular interval (every 5 minutes or so); they require the application context (i.e. the application packages need to be available in memory); they do not need any input other than database access, in order to perform some not-so-heavy tasks such as sending out e-mail and updating the state of the database. Now I was thinking that the most simple approach to this problem would be simply to piggyback on the existing application process (as spawned by mod_wsgi). By implementing the task as part of the application and providing an HTTP interface for it, I would prevent the overhead of another process that is holding all of the application into memory. A simple cronjob can be setup that sends a request to this HTTP interface every 5 minutes and that would be it. Since the application process provides 15 threads and the tasks are quite lightweight and only running every 5 minutes, I figure they would not be hindering the performance of the web application's user-facing operations. Yet... I have done some online research and I have seen nobody advocating this approach. Many articles suggest a significantly more complex approach based on a full-blown messaging component (such as Celery, which uses RabbitMQ). Although that's sexy, it sounds like overkill to me. Some articles suggest setting up a cronjob that executes a script which performs the tasks. But that doesn't feel very attractive either, as it results in creating a new process that loads the entire application into memory, performs some tiny task, and destroys the process again. And this is repeated every 5 minutes. Does not sound like an elegant solution. So, I'm looking for some feedback on my suggested approach as described in the paragraph before the preceeding paragraph. Is my reasoning correct? Am I overlooking (potential) problems? What about my assumption that application's performance will not be impeded?

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  • Detect if visitor is on index page with client side scripting

    - by sterling
    Is it possible to detect if a visitor is on the index page or domain root with client side scripting? I figure javascript would be the best method as I would like to append a value to an image file based on wether a visitor is on the home page or not. Non-index page: <img src="/img/logo.png" /> Index page: <img src="/img/logo-home.png" />

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  • ASP.NET MVC, How to get the page content before render

    - by user361993
    In ASP.NET MVC, how to get the page content before render, we know in Web form app, we can override the method protected override void Render(HtmlTextWriter writer) to get the page content before render. but in MVC there are no event concept, so how we can get the page content. the purpose for that is to emphasize(wrap <strong> tag) the keywords before the page rendered. I'd appreciate for any advice. Thank you.

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  • In GWT I'd like to load the main page on www.domain.com and a dynamic page on www.domain.com/xyz - I

    - by Mike Brecht
    Hi, I have a question for which I'm sure there must a simple solution. I'm writing a small GWT application where I want to achieve this: www.domain.com : should serve the welcome page www.domain.com/xyz : should serve page xyz, where xyz is just a key for an item in a database. If there is an item associated with key xyz, I'll load that and show a page, otherwise I'll show a 404 error page. I was trying to modify the web.xml file accordingly but I just couldn't make it work. I could make it work with an url-pattern if the key in question is after another /, for example: www.domain.com/search/xyz. However, I'd like to have the key xyz directly following the root / (http://www.domain.com/xyz). Something like <servlet-mapping> <servlet-name>main</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> doesn't seem to work as I don't know how to address the main page index.html (as it's not an actual servlet) which will then load my main GWT module. I could make it work with a bad work around (see below): Redirecting a 404 exception to index.html and then doing the look up in the main entry point, but I'm sure that's not the best practice, also for SEO purposes. Can anyone give me a hint on how to configure the web.xml with GWT for my purpose? Thanks a lot. Mike Work-around via 404: Web.xml: <web-app> <error-page> <exception-type>404</exception-type> <location>/index.html</location> </error-page> <welcome-file-list> <welcome-file>index.html</welcome-file> </welcome-file-list> </web-app> index.html -- Main Entry point -- onModuleLoad(): String path = Window.Location.getPath(); if (path == null || path.length() == 0 || path.equalsIgnoreCase("/") || path.equalsIgnoreCase("/index.html")) { ... // load main page } else { lookup(path.substring(1)); // that's key xyz

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  • Select result in single cell

    - by Ruslan
    How can i select all id's for records in single cell? For example: --example select of all values select id, name, address, phone from table And get all id's where phone like '%555%' and show them in single field like: '111 123 234 321 231 234'

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  • no page break in rdlc report

    - by Vikram Patel
    i want to see output of my rdlc report as a continuous report, not page by page, in my browser using reportviewer (just like as in pdf files). i don't want to click "next page" button every time to see next page of the report in my browser.

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  • iPhone - packaging multiple app in a single app

    - by karim
    Hi, I would like to package multiple app in a single app. So donwloading one app and install that in an iPhone will install 3/4 apps. Something like java midlet suits having multiple Midlets in a single jar file. Is it possible by using multiple target or bundle, aggregate target etc.?

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  • MVC4 dynamically changing master layout page doesn't work on first load

    - by Kelvin
    I have an MVC4 mobile project that I want to add a desktop (non mobile) page to for some users. I have added a new desktop master page and assigned my view to use it. The first time I navigate to the page it renders using jquerymobile which appears to somehow be cached from the previous screen. If I hit F5 to refresh the page it displays using the assigned desktop masterpage correctly. Can anyone tell me how to fix this? Any insight appreciated

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  • Need to replace HTML single-quote entity in MySQL

    - by modulaaron
    Hi, I currently have the following MySQL statement to replace the HTML entity for a single quote with an actual single quote: update photo_galleries replace(title, '&#39;', '\''); This statement returns an error. I have tried adding additional backslashes, but this does not help at all. I want to run this command using pure SQL (no PHP, etc.). Any suggestions are welcome and appreciated. Thanks.

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