Software architecture question. + second question as bonus)

Hi, my little friends! I have 2 questions about architecture.
1) What is the approach for interactive GUI? Suppose, I need in my gui hierarchy to change panel (and all objects it contains) to new panel . I need it by clicking button1. So, where should i put Action Listeners buttonclicked method? At JFrame or where? Is it a good idea to have static class ContentBuilder which will return all kind of elements? For example getMainMenu(ContentBuilder.NEW_CLIENT_CAME_FOR_HALLOWEEN)
2) I have database... my application connects to it. I need new customer... I created JTextField for first name, last name... then input data... gui generate an object client (Class Client) then one by one get strings from Jtextfields to object attributes. Then never guess, this object went to model(according to model view controller pattern) and then there all strings one by one goes from object attributes to table fields... The end. Is it good? or not?
Thanks in advance. God bless you.
Sincerely yours, Mr. America. (:

America70 wrote:
Hi, my little friends! I have 2 questions about architecture.
Your first question is really four.
1) What is the approach for interactive GUI? Suppose, I need in my gui hierarchy to change panel (and all objects it contains) to new panel . I need it by clicking button1. So, where should i put Action Listeners buttonclicked method? At JFrame or where? Is it a good idea to have static class ContentBuilder which will return all kind of elements? For example getMainMenu(ContentBuilder.NEW_CLIENT_CAME_FOR_HALLOWEEN)
The ActionListeners are part of the controller. I'd have a controller that instantiated the UI elements and injected them with the Listeners they need. That way you can change the Listeners if you have to on the fly.
I'd want to see /ui, /controller, and /model packages in your solution. The /ui package would have interfaces for injecting Listeners, but it should have JPanels that the Controller could assemble into JFrames for display.
2) I have database... my application connects to it. I need new customer... I created JTextField for first name, last name... then input data... gui generate an object client (Class Client) then one by one get strings from Jtextfields to object attributes. Then never guess, this object went to model(according to model view controller pattern) and then there all strings one by one goes from object attributes to table fields... The end. Is it good? or not?
"One by one"? No. Create the Client class, pass it to the Controller, and let it deal with the database.
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Let's say that I want the JOptionPane in the above example to have its parentComponent refer to the instance of MyGUI. The following code is one means of passing the reference down to the HardDriveController, while still using the getParentFrame() method in HardDriveController:
public class MyGUI extends JFrame {
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Proflux, One thing I failed to mention is that this is a very old codebase and the likelihood of the object graph being reworked is slim to none. I agree with you 100% that the dependency doesn't feel right. But I have to live with it. I mentioned the idea of using a singleton pattern. Here's a mock up of how that would look:
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Hello,
I am looking for a forum where you can discuss software architecture topics. There are so many questions and controversal discussions in this field. I did not really find a forum for that in particular.
A few days ago I posted a question in the RMI-forum (by the way: with no answers so far) where I wanted to know how to distribute data from one source to many receivers (on the same JVM and also on different JVMs). The receiver should be able to select the data they need (so it not always the same data which is send to the different listeners.
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public interface DataReceiver extends Remote {
public boolean isRemoteObject() throws RemoteException�
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Now I implement an ArrayList with DataReceiver-Objects and if data changes I can call the transmitData(..)-method of all these objects.
Is this a good way to do this, or are there better solutions. I am open to any help here.
I think this is not only a RMI-topic, because maybe a JMS-solution would be maybe a better solution. And why use RMI at all? Maybe a network/socket solution is faster.
By the way: Does anyone have experience in building a trading system (for algorithmic trading) ?
thanks
tk

Hello duffymo...
duffymo wrote:
1) Speed
If I use the RMI/interface-solution you can directly use the methods of the interface without having some layer in between if you are in the same JVM. This should be faster as JVM. I have no idea what the situation is like if the receiver is not on the same JVM. How fast is the RMI/interface-solution? How fast is the JMS-solution?RMI? Same JVM? No you're not - each remote client runs in its own JVM. What are you talking about? If they'er all in the same JVM, there's no need for RMI. That's just JavaBeans and events.o.k....from the start....some clients are on the same machine AND some are on different ones. Speed is essential here, especially for the clients on the same machine (components of the server itself). In using this interface you could manage clients no matter whether they are local objects or remote objects. The object that have to notify the clients even do not have to know whether the clients are on the same JVM or the data is forwarded via RMI (or sockets).
If the objects are local the "notification" is just a method call (therefore very fast) and if they are remote you have a pure RMI remote object call. Which also should be faster than JMS.
JMS, by definition, is asynchronous. The publisher sends off the message and doesn't wait for any response. It also doesn't worry about who responds, because it's up to subscribers to indicate their wish to receive the message.yes, so there is a lack of control, what I said. There many tasks where you need this, but there also many tasks where you cannot use MOM.
I have no idea why you're so worried about speed in that case....because this is the requirement !!!! I mentioned it several times. We are talking here about milliseconds. Each detour of the data flow or every data-copying (within the memory or even worse to a database/HDD) takes valuable time.
2) Control
the RMI/interface-solution provides more control. How can you say "more control" when you admit that you don't know JMS?You can get the idea of MOM (i.e. JMS) very fast I think. And I dealt with the topic for some time. I am working in the computer science for 17 years now, believe me, I am able to learn.
I�ve explored the acknowledge-methods of JMS and they all are very slow. You can not use this in a system where speed matters. And you get no direct feedback. (If receiver A and B subscribed to some data, how to find out that both got the data? The sender do not know its receivers and this is one source of the lack of control)
And: If you send the data via a method call, you can get a return value and exceptions. You are free to do (almost) eveything you want. Do you really want to say, that with JMS you have this kind of control?
The sender knows all the clients and can check, whether they have really received the message or not. Maybe even provide some feedback. Can you provide this with JMS?The whole idea behind publish/subscribe is that the publisher doesn't have to know.
JMS can be set up to guarantee delivery.Yes....BUT: I want to find the best solution to a GIVEN problem.
I think here speed is really what matters. And that is the main reason against using JMS. Therefore I think I do not have to deal with JMS any more. The idea of JMS is nice, and I will use surely use it in the future for some other projects, but here - I think - I cannot use it.
and something to "guarantee delivery" ... this is not always a good thing. In some cases the receiver do not want to receive "old data". It depends on the task to accomplish.
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And I said.....?????
I think the RMI/interface-solution is not easy. For example you have to use threads (incl. thread-pool) to send all the messages almost at the same time. On the other hand I think it is not too difficult and maybe worth the effort.RMI isn't easy, and it's brittle. Change the interface and all the clients change.yes, I agree. I faced a lot of problems with RMI. But then provide some alternatives. JMS seems to be too slow (and I do not have the time for coding an interface on the socket basis).
I think it is difficult and not worth the effort. JMO, of course.
JMS is done for you. You don't have to maintain that code.except the performance problem
The most important points are here reliability and speed. JMS is more reliable than anything you'll ever write, and it's fast enough."fast enough" .... how can you decide. I can tell you, it is not fast enough.
and reliable: yes I would prefer JMS here. really! I have to admit while reading the specs I began to like JMS. really. There are some chat-functions to implement. This should be very ease with JMS.
I think going down an RMI road for this would be foolish. I wouldn't do it.Maybe there are some other solutions. I will keep looking. And I will check the frameworks stefan.schulz mentioned.
I am very sorry, but I think this is a justified question. And this comment is not very nice at all. There are so many different areas in the Java-World, and no one can be expert in every field. I think this is what all the forums are about. Share knowledge and help others. It's not intended to be mean or demeaning. I don't know if you're aware that excellent commercial trading systems exist, written by people that wouldn't have to ask about RMI or JMS to do it. The fact that you have to ask suggests to me that you aren't one of those experts. If you're doing this as a learning exercise, I'd say go for it. Do it both ways in that case and learn for yourself. Just be realistic about the end goal: it won't be a system that will be used in production anywhere.I am in the financial business for almost 8 years now. And there are many different areas and roles. You have no idea what the systems are like, that I usually design (and they are very, very successful). I think your comments are rather unrefined. And maybe you should think about beeing a little bit more open-minded. You cannot prejudge everything.
Software development is very complex because of all the tools and methods in this field. Knowing when to use a tool/framework/method... is as important as knowing when NOT to use a tool/framework/method/...Yes, and knowing your limitations is also very important.what is the purpose of this last sentence?!
I really want to know!
You are the one, who wrote
JMS is more reliable than anything you'll ever write, and it's fast enough.Without knowing anything about the system (that is not true: I mentioned several times that speed is very important).
Without knowing anything about me...
I really appreciate your contribution here (it really helps), but I stick to it: it is not very nice to goof on someone.
regards
tk

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"
Now my question is, i want to process the data which i get from database. where should i write that processing logic after getting the data from database? in model classes? or in view model classes?
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Why would you care?
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Regards
Mike

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Correct software architecture

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I´m designing a complex application and I don´t know what software architecture is the best. I have been reading the "LabVIEW Intermediate I: Succesful Development Practices" manual. Lesson 3 gives the reader a lot of options for software architecture selection, but, although it gives a lot of explanations, I can´t find the correct one (maybe I should use a combination of some of them).
The application runs in a PC. This application communicates with 4 controllers via CAN and with another one via Ethernet.
Both communications are very asynchronous because I have to read a lot of data but send only a few.
I have to receive a lot of data from the first controllers (CAN connection) and display a graph containing all data. Reception must be as fast as possible without losing any data. During graphic displaying time is important but not critical. In the other hand, is critical not to lose any data. I mean it is critical to collect all data although they aren´t displayed in "Real time".
I have to send some data to the controllers via CAN but in this case, transmision rate can be quite slow, so I guess it can run in another loop.
Communication with the other controller (via Ethernet) have a similar behaviour, but it don´t have to be as fast as CAN communication.
Finally, I have a User Interface where basically I change parameters and send them to controllers so there are no intensive processing or activity.
I have been thinking about using Master/Slave or Producer/Consumer architectures but I don´t know what architecture best fits my application.
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Thanks!

Personally, I would stick with the producer/consumer approach for this in order to seperate out the UI code from the rest.
Additionally, I would launch a background process (out-of-line via VI server, but I can't find any decent references at the moment) for each CAN so that the communication for each device can run in a seperate thread. This way if one blocks up or generates an error, it won't block the others. These VIs running in the background then send the acquired data via QUEUE to the main program.
I've used this approach in the past for communicating in parallel with many devices and have found it to be very good. The time required to get it up and running is maybe a bit longer, but in the end it's worth it.
So basically, 1 VI 1 device on the level closest to the hardware and then one UI VI which communicates with the others via QUEUEs.
That's my 2c, maybe someone else has a different approach.
Additionally, Sorry I can't give an example of what I mean, or a decent reference but y quick saerch of the forum didn't show me anything useful. With time it'll work, but I don't have too much time at the moment.
Hope this helps
Shane.
Using LV 6.1 and 8.2.1 on W2k (SP4) and WXP (SP2)

Question Bank Question

Hello
2 Questions I'm affraid
Question 1
I am using Captivate 5. Is there a way to say have 10 questions in a question bank but randomly only ever show 5 questions.
For example two people sitting next to each other at a PC both taking the same course which has 5 questions, however they both see different questions.
Question 2
can I attach more than one question bank to a test. For example: A person is being tested on several different subjects from say Pain management to fire saftey. Is there away to set up several question banks and attach them to one test and randomly take questions from each bank. ie
Question Bank 1 Fire Safety . . 10 questions
Question Bank 2 Pain Management . . 10 Questions
Question Bank 3 Resucitation . . 10 Questions
I want the acutual test to randomly take five questions from each bank.
Thanks

What you describe should be possible using question pools in Captivate.
A question pool can have dozens of questions but if you only have 5 slides in your movie linked to that question pool then your users will only ever see 5 randomly selected questions each time the movie is played.
Just be aware that those same 5 questions will be visible during that session no matter how many times the learner retakes the quiz. In order to see a different set of 5 randomised questions from the same pool the learner would need to relaunch the entire lesson again.
If two people log onto the same PC and each launches the same lesson (separately) then they will see a different randomised set of questions from the same pool.
You can have multiple question banks in the same project, and each can have as many questions as you need. All you need to do is insert question slides in your movie and select the option that they are randomised questions. When you select this option, you get the drop down menu that allows you to select which question pool the questions will be drawn from for that slide. If you later decide you want the slide to draw from a different pool, you can easily change this in the Properties tab.

Software architecture question. + second question as bonus)

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