// concurrent/Machina.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import onjava.Nap;

public class Machina {

public enum State {

START, ONE, TWO, THREE, END;

State step() {

if(equals(END)) return END;

return values()[ordinal() + 1];

}

}

private State state = State.START;

private final int id;

public Machina(int id) { this.id = id; }

public static Machina work(Machina m) {

if(!m.state.equals(State.END)){

new Nap(0.1);

m.state = m.state.step();

}

System.out.println(m);

return m;

}

@Override public String toString() {

return "Machina" + id + ": " +

(state.equals(State.END)? "complete" : state);

}

}