Vala Facade example

Facade.cs

public interface Pomodoro.Service : Object {
    public State get_next_state ();
    public int count_state (State state);
    public uint count_time_per_state (State state);
    public void start_next () { start (seq.next_state ()); }
    public void start_work () { start (State.WORKING); }
    public void start_short_break () { start (State.SHORT_BREAK); }
    public void start_long_break () { start (State.LONG_BREAK); }
    public virtual signal void start (State state = State.WORKING);
    public void pause ();
    public virtual signal void stop (bool was_canceled = false);
    protected virtual Timer create_timer (State state);
}