// Technically this listener is added after start() was called so it is a little gross, but it
// is called within doStart() so we know that the service cannot terminate or fail concurrently
// with adding this listener so it is impossible to miss an event that we are interested in.
addListener(new Listener() {
@Override public void terminated(State from) {
executor.shutdown();
}
@Override public void failed(State from, Throwable failure) {
executor.shutdown();
}}, MoreExecutors.sameThreadExecutor());
return executor;