Java software architecture - discussion forum

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.
My idea/suggestion was, to create this interface for example
public interface DataReceiver extends Remote {
public boolean isRemoteObject() throws RemoteException�
public void transmitData(MyData data);
}With that interface I am able to use RMI to access Objects on other JVMs as well as Object on the same JVM which are only implementing this interface.
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.
3) Messages
in the RMI-Interface-solution I can send almost all kind of objects to the client (serializable). As I can see you can also send java-objects via JMS, but it seems to be more complicated (messages have to match a standard (header, properties, body)...).Read more about JMS. Ditto for it if you send an ObjectMessage.???
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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Edited by: rohit pathak on Feb 9, 2012 10:10 PM

Hi,
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As i study from several sources , JCRE is complete package - it behaves as a operation system and use the functionality of component it contain. I also think if i will purchase a java card from any vendor , it would have JCRE inside it (means everthing inside it,), i only need to develop the applet according to my requirement and install it by on card installer program Actually it depends. There can be following models in this regards:
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2. As you said, Buy a card with preloaded OS and then write applets for it.
QUESTION 2- what is the advantage of java card.?
* Interoperable: Applets developed with Java Card technology will run on any Java Card technology-enabled smart card, independently of the card vendor and underlying hardware.
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* Compatible with Existing Standards: The Java Card API is compatible with international standards for smart cards such as ISO7816, or EMV. Major industry-specific standards such as Global Platform and ETSI refer to it.
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source: http://java.sun.com/javacard/overview.jsp
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i never make any java window application yet) * It is easy you can look here and start: http://www.roseindia.net/java/example/java/swing/
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JSR 177 Security and Trust Services API for J2ME™
JSR 179 Location API for J2ME™ 1.0
JSR 180 SIP API for J2ME™
JSR 184 Mobile 3D Graphics API for J2ME™
JSR 205 Wireless Messaging API 2.0
JSR 226 Scalable 2D Vector Graphics API
JSR 234 Advanced Multimedia Supplements
JSR 248 Mobile Service Architecture for CLDC
JSR 75 FileConnection and PIM API
JSR 82 Java™ APIs for Bluetooth 1.1
Nokia UI API
Message Edited by petrib on 13-Mar-2009 11:21 PM

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