code: protected final void started() {
      if (!state.compareAndSet(State.STARTING, State.ALIVE)) {
        LOG.info("Program already started {} {}", programName, runId);
        return;
      }
      LOG.info("Program started: {} {}", programName, runId);
      executor(State.ALIVE).execute(new Runnable() {
        @Override
        public void run() {
          state.set(State.ALIVE);
          caller.alive();
        }
      });
    }
docs: Children call this method to signal the program is started.