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POIdeas to define java architecture for a Swing-JavaFX / RMI / EJB3.0 application
 

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  1. POIdeas to define java architecture for a Swing-JavaFX / RMI / EJB3.0 application
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    <p><strong>The problem</strong></p> <p>We are involved in a new project to develop an application with several PC's that will act as general purpose computers. There is also a computer that will act from time to time as a master machine to gain the control of all the processes of the clients. That computer has to send a message to all the others through a server machine asking for instance to register assistance. At that time, a process running in the client machines has to gain the control of the computer and act as an slave machine running that application only until a new message is sent from the master machine to release them. After that, the client machines act again as a general purpose computers. </p> <p><a href="http://i.stack.imgur.com/TWeBp.jpg" rel="nofollow">The following scheme</a> tries to explain what happens after the CM(Control Machine) gains access of the SM(Slave Machines) through the server (SRVR)</p> <ol> <li>Control machine CM sends message to register assistance to a server 2 The SRVR receives the message, logs some information and broadcasts the register assistance message to the SMs</li> <li>The running SM process that was waiting the message gains total control in each SM</li> <li>The user chooses an action through a view in the SM and the machine sends a response to the SRVR</li> <li>The SRVR receives the response and broadcasts it to all the machines, including the results machine (RM) to update the views with the new state in the server (SRVR)</li> <li>The CM sends the End Register Message to the SRVR.</li> <li>The SRVR broadcasts the message to all the SMs, the application view closes and the application enters to a listening state again.</li> </ol> <p><strong>Stated that:</strong></p> <ul> <li>Everything needs to be done in some kind of Java Technology</li> <li>All the machines are runing GNU/Linux/Gnome (Ubuntu)</li> <li>JPA is mandatory for the logging and persistence</li> <li>JavaFX is going to change according to Oracle because they are thinking to abandon the scripting language</li> </ul> <p><strong>Questions are:</strong></p> <ol> <li><p>Which mix of java technologies would you use for the view?. My opinion is using Swing and maybe embbed this in FX through SwingComponent.wrap(loginPanel) to help graphic designers do a better visual work (a must in this application). Please consider the binding options JSR-295 (now dead as I can see) or some adequate alternative. </p></li> <li><p>How would you maintain updated the application client, my opinion is through Java Web Start and serving it as an applet.</p></li> <li><p>Is it ok if the SRVR uses Java EE with EJB 3.0 to access to remote objects? If so, how would you integrate/model/ EJB with RMI. I have no big experience with RMI/EJB integration and I am not so sure that it is correct. Specially because EJB specification trusts in RMI already. But then how to broadcasts messages from a Session Bean (Stateful one as I can see) to update the view?</p></li> <li><p>Any option chosen in SM has to be viewed in all the views (other SMs, RM and CM) registered as observers. Would you suggest a model/architecture/products for this. </p></li> <li><p>Which is the right way to make the SM application gain total control once its process is awaken? -remember, it is Linux-</p></li> <li><p>How the observer pattern has to be applied in a distributed context?</p></li> <li><p>Is the HW arrangement correct for this application?</p></li> </ol> <p>I know these are lot of questions and I am not trying to begin a discussion about this, I know that there can be a lot of different opinions and I am interested in hearing all of them, including implementation details. I am looking for some feedback from you guys, your opinions will be highly appreciated. Thanks in advance!</p>
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