Java Observer (Design Pattern) [French/Français]

.Observer

Java Observer (Design Pattern) [French/Français]

Main.java

public class Main {

    public static void main(String... agrs) {
        Serveur serveur = new Serveur();

        Technicien tec1 = new Technicien("Gabriel","514 252 9298");
        Technicien tec2 = new Technicien("Vincent","438 555 7275");
        Technicien tec3 = new Technicien("Christian","123 456 7890");

        serveur.register(tec1);serveur.register(tec2);serveur.register(tec3);

        serveur.changeServerStatus("Warning #492");
    }

}

Observer.java

public abstract class Observer {

    /** Observer style
     * Push me = if data is pass
     * Pull me = if no data is pass
     */
    abstract void update(String message);

}

Serveur.java

public class Serveur extends Sujet {

    private List<Observer> observers;
    private String status;

    public Serveur() {
        this.observers = new ArrayList<Observer>();
    }

    public void changeServerStatus(String status) {
        this.status = status;
        notifyObserver();
    }

    protected void register(Observer observer) {
        observers.add(observer);
    }

    protected void notifyObserver() {
        for(Observer observer : observers)
            observer.update("Server "+status);
    }
}

Sujet.java

public abstract class Sujet {

    abstract void register(Observer observer);
    abstract void notifyObserver();

}

Technicien.java

public class Technicien extends Observer {

    private String name;
    private String telNumber;

    public Technicien(String name, String telNumber) {
        this.name = name;
        this.telNumber = telNumber;
    }

    private void sendServerUpdate(String message) {
        System.out.print("Message \'"+message+"\' send to "+name+ ":"+telNumber+".\n\n");
    }

    protected void update(String message) {
        sendServerUpdate(message);
    }

}