Large Application - Should I be using modules?

I have built an Estate Agency application in Flex 4.6 which is solely used internally.
Each process within the application, such as editing property information, is handled within a component and some components have sub-components which are loaded via a ViewStack, such as the customer account component which has sub-components like "address information", "summary", etc.
The problem is when a large component is loaded for the first time which has multiple sub-components, such as the customer account component, data is fetched from the server application (which takes 200ms) and populated into the various TextInput/DataGrid/DropDownList components within the customer account component and its sub-components. This results in the entire application hanging until the components have been populated.
Is there a way to prevent this from happening, such as being able to load the component and its sub-components in the background, allowing the user to continue using the application in the foreground?
Would it be more beneficial to use modules instead of components so the code is loaded from a separate SWF?
Any help and advice would be greatly appreciated. Thanks in advance.

IMO, If your application is large, modules will likely help in ease of development, load time, and memory management.
As far as initializing a lot of components and stuffing them with data, I don't think it will matter too much if the components are in a module or not. You are correct that you want to try to do it in the "background" although there is no official background processing in Flash/Flex.
IMO, it comes down to whether you really can do all of that work of initializing "all" of the components fast enough. If you can guess you're going to need those components then you can get a head start, but will you know soon enough to finish before the user starts complaining about waiting? If you think you can, then one technique folks use is to only initialize a few components at a time. Use states or pure AS to add and initialize "some" of the components and when they are initialized, do a few more.
Also consider whether all of these components fit on the screen or not. If there are components that are not immediately on screen consider initializing them later.
Another thing worth doing is using the profiler. Several times I've seen folks go through extra validation passes in the LayoutManager than can often be avoided and save bit on initialization time.
A final technique is to give up and choose to distract the user instead. The simplest form of that is giving them something to read while everything else is going on behind the scenes.
Good luck,
-Alex

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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).
Example. Two developers working together on same project. Internally project is modular, so one developer will work with module "Analysis", and another one with "Configuration" without interferences. These modules placed into Subfolders as shown in example above.
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

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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:
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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.

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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.
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Large application: how to structure?

Hello JHS team,
At my current customer, there is a very large Forms application (Designer generated, +100 fmb's). On the long run, the goal is to get this application migrated to ADF using JHS. With or without the forms to ADF conversion utility.
My question now is how to structure the ADF/JHS version. The Forms application has a menu on top of the screen, with a hierarchical structure. Each menu item links to a specific .fmb in the application, and some fmb's are also linked to eachother.
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Chris

Chris,
Please use the internal mailing list.
The forum is intended for customers/partners.
Btw, The ADF Methodology group has quite a few interesting threads related to structuring large ADF apps.
Steven Davelaar,
Jheadstart Team.

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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... )
2. Set up projects for each of the applications. The entity/view objects and such DO NOT appear directly in this project ( and you might not want all the programmers to have updateable access to 'em anyway... it needs to go through some sort of command/control structure ). They use the library to add their own special view objects and such... and build the application.
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Business Components can be packaged up for deployment and reuse like any java classes.
You can easily create a JAR file for all of the common entity objects, associations, domains, and base view objects of use to multiple applications. You can use the standard JDeveloper deployment wizard for this, and indicate that you want to create a "Simple Archive File". What will get JAR'ed up will be all of the XML and *.class files that comprise your components.
Then, any other BC4J project can include this "application core" JAR file as a library and then import all of the components (READ ONLY). All of the core components are available for reuse, but the imported components cannot be modified in the importing project.
See the help topic:
Developing Business Components[b]
--[b]Working with Business Components Projects, ...
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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.
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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.
How the classes are organized into packages is a less interesting, though if a package has more than 30 classes then there's a good chance that it's too big and you should try and divide it up.

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Large Application - Should I be using modules?

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