Class NanoTimeTimerImpl

solr/core/src/java/org/apache/solr/util/RTimer.java:46–63

  }

  private static class NanoTimeTimerImpl implements TimerImpl {
    private final TimeUnit timeUnit;
    private long start;

    public NanoTimeTimerImpl(TimeUnit timeUnit) {
      this.timeUnit = timeUnit;
    }

    @Override
    public void start() {
      start = System.nanoTime();
    }

    @Override
    public double elapsed() {
      return timeUnit.convert(System.nanoTime() - start, TimeUnit.NANOSECONDS);
    }
  }

  protected TimerImpl newTimerImpl() {
    return new NanoTimeTimerImpl(timeUnit);