Large Application Structure

Hi all,
I am thinking about the structure of a large application. I have built 5 independent VIs (each from independent LV Projects); 4 which gain the necessary inputs from the user (each has While Loop with Event Structure) and do their own processing to devise a large set of input data and parameters for a main processing VI. The main processing VI can be slow to function.
I was considering the following structure:
A main UI VI which calls each of the 4 UI VIs in succession using an invoke node or similar via the VI subpanels. I have never used a VI subpanel.
Passed to each of the 4 UI VIs is a large cluster which each contributes to.
The large cluster is passed to the main processing VI (which has independent While Loop) via a Queue?
Your thoughts, ideas and examples would be greatly appreciated.
Battler.

You could have all VI's integrated in the main VI by putting it in a state-machine and have the UI's of the different VI be accesable via a tab control.
My personal favourite in this case is to use the subpanel when the configuration items have no direct relation and to use a single VI with tab control when they do.
Text below is just in case you don't know what a state-machine is.
State-machine basic explanation.
E.g. an application has 3 states:
Init (do all initialisation and auto-transition to next state "main"),
Main (do all normal application stuff, e.g. event structure for UI handling, transition to state "Clean-up" on app stop event),
Clean-up (close all references and delete temporary files).
Message Edited by andre.buurman@carya on 04-02-2010 03:41 PM
Regards,
André
Using whatever version of LV the customer requires. (LV5.1-LV2012) (www.carya.nl)

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Hello,
I have a fairly large application, totaling around ~150,000 lines of code.
Unfortunately, when I first began building this application, my understanding of file structure and various architectural patterns was quite limited, and the code could easily be labeled as "spaghetti code."
Since then, I have begun migrating everything over into an MVC structure, but was not entirely sure how to proceed.
I have one primary file, let's say Application.as that is essentially the main actionscript class, and I am using 'include "com/controller/hello.as"' instead of importing classes because I did not want to clutter up my code by using classes all over the place and having to instantiate them.
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Flex is an Object Oriented environment and so NOT using classes and objects will generally lead to the architectural anti-pattern (read Bad) sometimes refered to as the Big Ball Of Mud (aka spaghetti code).
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One good indicator as to whether or not you have a good class is to use a unit testing framework (http://flexunit.org/) and write tests for the class. If it's hard to test it then it's probably still too complicated.
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To follow up on an offline conversation.
If one were to build a Very Large Application or Application Suite using JDev, does the following make sense as an approach?
1. Set up a project with all your Domains, entity objects and View objects to be used across all other projects. This is maintained by someone (like a dba) who puts validations, defaults, rules, and the like here. Periodically this could be generated into a library for use by other projects. ( Hmmm... I don't know how to do that yet... )
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Will that work? Is that the way it should be put together?

Business Components can be packaged up for deployment and reuse like any java classes.
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See the help topic:
Developing Business Components[b]
--[b]Working with Business Components Projects, ...
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Each new application you build will likely need some application-specific view objects, so I wouldn't work under the assumption that all view objects need to live under the "core" project.

How to use Source Code Control for Large Application?

Hi, All!
I would like to collect knowledge about "best practice" examples for using Source Code Control and project organization for relative large application (let's say approx 1000 SubVIs).
Tools used:
LabVIEW 8.0
CVS Server
PushOK CVS Proxy Client
WinCVS
With LabVIEW 8 we can organize large project pretty well. This described in article Managing Large Applications with the LabVIEW Project.
I have read this article too: Using Source Control Software with LabVIEW In this Article Source Safe used, but with PushOK all looks nearby the same and works (some tricks for compare function are required).
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Scenario 1:
Developer A started with modification of module "Analysis". Some files checked out. He would like to add some SubVIs here. So, he must also perform check out for the project file (*.lvproj), otherwise he cannot add anything into project structure.
Developer B at the same time would like to add some new functions into module "Configuration". He also needed to check out project file, but this file already checked out by Developer A (and locked). So, he must wait until lvproj file will be checked in. Another way is mark *.lvproj files as text files in PushOK, but then one of developers will get conflict message by checking in and then merging will be necessary. This situation will coming very often, because in most cases *.lvproj file will be checked out all the time.
Question: Which practice is better for such situation? Is Libraries better than folder for large project?
Scenario 2:
Developer C joined to the team. First, he must get complete project code for starting (or may be at least code of one Library, which assigned to him).
Question: How it can be done within LabVIEW IDE? Or WinCVS (or other SCC UI) should be used for initial checkout?
Scenario 3:
Developer D is responcible for Build. Developers A,B,C have added lot of files into modules "Analysis", Configuration" and "FileIO". For building he need to get complete code. If our project splitted into folders, he should get latest *.lvproj first, then newly added SubVIs will appear in Project Explorer, then he should expand tree, select all SubVIs and get latest versions for all. If Project organized in Libraries, he must do the same for each library, isn't?.
Question: Is this "normal way", or WinCVS should be used for this way? In WinCVS its possible with two mouseclicks, but I prefer to get all code from CVS within LabVIEW IDE recursively...
That was a long post... So, if you already working with LabVIEW 8 with SCC used for large project, please post your knowledge here about project structure (Folders or Libraries) and best practices, its may be helpful and useful for all of us. Any examples/use cases/links etc are appreciated.
Thank you,
Andrey

Regarding your scenarios:
1. Using your example, let's say both developers checked out version 3
of the project file. Assuming that there are only files under the
directories in the example project, when Developer A checks in his
version of the project, there will be new files in one section of the
project separate from where Developer B is working. Developer B,
notices that there is now a version 4 of the project. He needs to
resolve the changes so will need to merge his changes to the latest
version of project file. Since the project file is a text file, that is
easy to do. Where an issue arrises is that after Developer B checks in
his merged changes, there is a revision 5. When Developer A and B go to
make another change, they get the latest version which will have the
merged changes to the project file but not the referenced files from
both Developer A and B. So when A opens version 5, he sees that he is
missing the files that B checked in and visa versa. Here is where the
developers will needs to manually use the source control client and,
external to LabVIEW, get those new files.
Where libraries help with the above scenario is that the library is a
separate file from the project so changes made to it outside of the
project do not require the project to be modified. So this time, the
developers are using a single project again which time time references
two libraries. The developers check out the libraries, make changes to
the libraries, and then check those changes in. So when each developer
opens the project file, since it references the project file, the
changes to the library will be reflected. There is still the issue of
the new files not automatically coming down when the latest version of
the library is obtained. Again, the developers will needs to manually
use the source control client and, external to LabVIEW, get those new
files. In general, you should take advantage of the the modularity that
libraries provide.
2. As noted in the above scenario, there is no intrinsic mechanism to
get all files referenced by a LabVIEW project. Files that are missing
will be noted. The developer will then have to use the source control
provider's IDE to get the initial contents of the project (or library).
3. See above scenarios.
George M
National Instruments

Large applications - Labview and other programming languages

Hello Labview Users,
as the forum saw this very interesting thread about large applications programmed in Labview
(see: http://sine.ni.com/niforum/niforum?requireLogin=False&forumDU=http://forums.ni.com/ni/board/message?... ) I would like to ask the community about their experiences with Labview applications in combination with other programming languages.
In advance: I have several years of experience in programming Labview applications starting from quick-and-dirty solutions which had to run within few hours and complex test solutions. I saw Labview growing and becoming better with the released versions and lot of things I missed in former times got implemented in the meantime. Actually I have to develop a complexe ATE solution with numerous equipment to control and numerous data to be captured and archived. Despite the Verison 8 I still feel still some drawbacks of the LV concept which let me hestitate to setup the solution completly in Labview:
1) It is alway hard to re-use code of complex applications since it is not possible to do some kind of global search an replace of functions
variables etc. It nearly impossible to re-use approved code structures (e.g a state machine) if the "inner part" is changing more the a little bit.
2) If the application requires a certain flexibility (e.g. exchangeable test equipment of varying vendors) this is hard to implement since you have to define a lot of parameters through your hierarchy if you dont want use global variables which slow down your application and hide
the code functionality.
3) Despite modern PCs the look and feel of LV applications appears somewhat slow compared to other applications. For complex user interfaces the polling methode generates a lot of complex code. (I dont have expierence with the event-structure).
Now my questions:
Do you have experience of implemention of complex solutions dividingthe code modules using Labview and other languages? Which other
languages did you use? Why did you use these languages (speed, flexibility of text based code, available library functions)? Did you found out this to improve your development time and code maintainibility?
(I concider a solution where I do the single tests with Labview-VIs but delegate all the test sequencing and data collection stuff written in PERL which allows really very compact code)
I'm curious what your experiences are.
rainercats

Given that you're asking these questions in a forum for LabVIEW users the opinions given are going to be somewhat slanted towards the general like of LabVIEW. I've been working with LabVIEW for a long time, ever since 2.something on a Mac. I've written numerous large-scale applications as well as "mundane" instrument drivers. As you've noted you're experienced with LabVIEW, so you know some of its strengths and weaknesses.
To address your specific questions:
(1) Yes, that has always been a limitation in LabVIEW, but I don't believe it is an overriding one to choose C over LabVIEW. Putnam provided one workaround for the search and replace of VIs. Once you've programmed in LabVIEW long enough you get used to doing it this way. Is it clumsy? Yes. As for the re-use of code structures, that's not entirely true. You can create a "template" VI (a regular VI, not a .vit) that contains the code you want to re-use and place in your palette with the "Merge VI" option set. That way you can select it from your functions palette, plop it down on your diagram, and you get the "template" VI's diagram placed right into your new VI.
(2) This is not something that is specific to LabVIEW, as this exists with any programming language. It's not the language that limits you here, it's how you've designed your code. In a language like C++ you would go with classes. You can do the same thing in LabVIEW. IVI is another option (though not preferred by me).
(3) As Putnam mentioned, you should be using the event structure.
Other thoughts:
The biggest strength I see with LabVIEW is that each VI is a miniature program, which allows development and debugging of functions a snap. With a language like C you have to write another program to call that function in order to debug it. The biggest weakness? I would say user interface. Yes, even with the event structure. Don't get me wrong, the event structure has vastly improved the way user interfaces and event handling in general are done with LabVIEW, but it simply doesn't hold muster to a program written in C or VB. ActiveX anyone? LabVIEW still doesn't do ActiveX properly in terms of actually getting the controls to work. Programming ActiveX controls is just plain aggravating what with all the property nodes taking up so much diagram space.
It certainly makes sense to use the best tools available to you to get the job done. In my recent projects I had to write software to run automated tests on some products my company made. The test modules were written in LabVIEW. The tests executive was a proprietary engine driven by a SQL Server database. I had to write a "wrapper" DLL that interfaced between the LabVIEW code and the executive since the executive hadn't been designed to call LabVIEW DLLs directly. This allowed us to use LabVIEW as the preferred language for developing the test modules and let the guys who were fiddling with the test executive do their bit. Of course, TestStand's premise is basically that.

Top level application structure with parallel data acquisition

Hey all LabVIEW-forum members!
I have some experience programing LabVIEW, but mostly concerning smaller for the simplest form of data acquisition. Now I need to develop a larger application that might be continuously run for several weeksin a row and for that reason I woiuld like to make sure the application structure is stable! I turn to you in hope of some input regarding the most suitable approach to my problem or some pointing in a good direction.
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Could I use another while-loop/event-structure inside this subdiagram and use user-registered events for the different data acquisition? Or is there some type of state-machine that is better suited to monitor time elapsed and can make a transition to a suitable state when it’s time to make any of the hardware measurement required? It would be nice to avoid using polling loops but maybe that is best way to go?
I’ve checked the “Continuously Generate Occurrences.vi”-example and that might be a way to go? What seems to be good with this approach is that I could let the different parallel hardware acquisitions actually be parallel, right?
I am really confused right now, hope someone has some helpful inputs!
Regards
Oscar

This post here can be proved as a great starting point for your application.
I am not allergic to Kudos, in fact I love Kudos.
Make your LabVIEW experience more CONVENIENT.

'The argument ' 0.000 V' cannot be interpreted as a number' when assigning application structure, line 805, contents "20140611NB F000000004500098898102E202USD 000..."

Hi All,
Data loading of 2LIS_02_SCL and 2LIS_02_ITM is getting failed by throwing an error
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I've got an application containing EntityBeans, statefull/stateless
SessionBeans, and a Webapplication. Every component is packed in a jar File
and all together in an EAR-File as an application.
Those EJBs share some common classes, for example:
EjbA in A.jar and EjbB in B.jar share a Helperclass C.
Where do I put this class C? I try to avoid to put this class C in the
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Any ideas? Thanx in advance.

FYI, this is fixed in 6.1
Torsten Friebe wrote:
Hi Daniel,
thanks, this article answers my question. But does WLS 6.0 or 6.1 allready
support J2EE Packaging as described in J2EE 1.3 Spec (PFD3) Chapter 8?
Cheers
Torsten
"Daniel Hoppe" <[email protected]> schrieb im Newsbeitrag
news:[email protected]..
Hi Torsten,
there is no really good solution so far. Check out this link, it
elaborates this topic in detail.
http://www.onjava.com/pub/a/onjava/2001/06/26/ejb.html
Cheers,
Daniel
-----Ursprüngliche Nachricht-----
Von: Torsten Friebe [mailto:[email protected]]
Bereitgestellt: Freitag, 29. Juni 2001 11:59
Bereitgestellt in: environment
Unterhaltung: deploying large applications and common used classes
Betreff: deploying large applications and common used classes
I've got an application containing EntityBeans, statefull/stateless
SessionBeans, and a Webapplication. Every component is packed
in a jar File
and all together in an EAR-File as an application.
Those EJBs share some common classes, for example:
EjbA in A.jar and EjbB in B.jar share a Helperclass C.
Where do I put this class C? I try to avoid to put this class C in the
Classpath of the application server. And when I put C in both
jar-Files I
got a ClassNotFoundException in one of the EJBs. I'm using WLS 6.0.
Any ideas? Thanx in advance.

Migration of large application from JDK1.4 to 1.6

Hi,
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> Yes, I do typically use an interface to hold my
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~

LabView causes system to lock up when editing block diagram of large application

I am attempting to go through a large application which was written for on a different machine with I/O attached. I am looking at it on a plain PC with no attached hardware. The application loads, I can get into the block diagram, but after viewing it for just a short time the display freezes (including the taskmanager), then the keyboard locks up. The only way out is to cycle the power on the PC. This is running W2K on a 550Mhz pentium III processor with 256MB RAM and a new installation of Win2K with all updates applied. This is with LabView 7.1. I can run smaller subvi's with no problem.
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If you have more than one user account, you must be logged in as an administrator to carry out these instructions.
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Page flow inheritance in Workshop 10 application structure?

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This is why you break your application into task flow, this allows you to have a hierarchy of taskflows and one icon in a diagram that can represent a complete flow.
Learn more about taskflows here:
http://www.oracle.com/technetwork/developer-tools/adf/learnmore/adfinsider-093342.html#a2

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Ok, I will try my best to clearly explain what's happening. Before I even attempt to do that, I will let those who need to know. That I went through over 8 pages of many different posts trying to find a problem similar to mine, with not much luck. There is no way that I'm going to go through 1235 pages of posts here in order to find one that might answer or solve the problem. I also use the search option to try and find a similar issue like mine. That's not to say there was none though, I wasn't able to find one.
I'm running iTunes version 10 and Windows XP Pro updated to service pack 3.My system meets all other requirements that I could find available on Apples iPhone website. I'm also using the usb cable provided with the phone.
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OK, reinstalled, turned off all firewalls, anti-virus, spyware, ad-ware, and anything else that didn't need to be running in the background. And it had the same results, no matter what I did. Even worse now, I thought I would try and download some smaller apps from my iPhone. Successfully downloaded each app without a hitch, but now when I use itunes on my PC. I'm told that itunes needs to copy those programs from my iPhone to the library on itunes. Does good until it gets to one of the larger programs, which to be honest isn't all that big "82 mb". I get the same error stated earlier.
So now, I'm pretty much screwed unless I just use my phone to download through my wi-fi, which performs flawlessly, other than what I just explained. Is there anyway to turn that feature off, then I can use itunes on my PC? I've downloaded some apps that are in the library in itunes, now I'm unable to transfer them to my iPhone.
Is this just related to the 3GS or is this being seen with the 4 also? Am I the only person who purchased a 3GS and is having the same problem? Anything I can supply or inform anyone with regarding this issue I will try my best to do so.

Using Discoverer as part of a larger application

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Hi,
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