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 开发者_JAVA百科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?

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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

• NetBeans Platform QuickStart
• NetBeans Platform – how to register a class as a provider of multiple services
• NetBeans Lookups explained
• NetBeans Developer FAQ - Lookup