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javadesign-patternsnetbeansnetbeans-platformmediator

Netbeans Platform Project using Mediator Pattern - Is it possible?

I want to use the mediator design pattern (http://en.wikipedia.org/wiki/Mediator_pattern) in my netbeans platform modular app. However, I am not sure how to do this on startup, since there does not seem to be a good way to create my mediator and then inject it into each module.

Does anyone know a good way to do this? Do I have to resort to using the Lookup API or something?

Solution

  • When it comes to the NetBeans platform and inter-modular communications most answers boil down to the lookup :)

    Using the sample code that you gave I'd do the following

    @ServiceProvider(service = Mediator.class)
class Mediator{..}

    The ServiceProvider annotation is a NetBeans extension to the ServiceLoader mechanism that automates the work of having to put values in the META-INF/services folder.

    The ButtonView class would be modified as follows

    class BtnView extends JButton implements Command {

    Mediator med = Lookup.getDefault().lookup(Mediator.class);

    BtnView(ActionListener al, Mediator m) {
        super("View");
        addActionListener(al);
        med = m;
        med.registerView(this);
    }

    public void execute() {
        med.view();
    }

}

    I'm not really familiar with the Mediator pattern, so I hope my understanding passes muster in as much as that you can understand the example.

    For more examples see these sites