class DropDataBaseClosure implements Closure, Serializable {
  public void execute(Object obj) {
    // drop database;
  }
}

And one would register it:

ConfirmationContext ctx =
  getEnvironment().requireEntry(ConfirmationContext.class);
ctx.confirm(new DropDataBaseClosure(), "Sure you want to drop database?");

You could also look at CancelConfirmingTransitionHandler.doTransition() for an example.