Question

I have a presenter class and several text fields in my view.

I want my presenter to say “every textfields that are listening to me, please do something now”.

BUT I don’t want to use Observabe/Observer, since I already use it and I don’t want to get confused.

To be a bit more specific, I want the textfields to update a Map in the presenter :

Presenter.java :

public class Presenter  {

   private HashMap<String,MyObject> map;

   theMethod(){
     //to all text fields, please update the map

Then a textfield in a panel :

JTextField tf = new JTextField("tf 1");
tf.//add something to listen to the presenter

The beginning of the process is the method in the presenter :

1. theMethod() is called (not by the view)
2. theMethod() triggers a method linked to the TextFields
3. Every methods called in every TextFields are doing something

Answer 1

I found it !

I use a Runnable callback in the presenter.

In my view I have :

        presenter.setCallback(new Runnable(){
            public void run(){
                System.out.println("the presenter want me to do something");
                //stuff
            }
        });

And in my presenter :

private Runnable callback;

public void theMethod(){
    System.out.println("I was triggered by another far away view");
    SwingUtilities.invokeLater(this.callback);
}

Of course, I’m going to implement some List for each textfield.

In the end, I have the expected behavior :

• Some methods dispersed in some places, but registered as callbacks
  in the presenter
• The presenter now able to fire those methods
  when he wants to !

Great !