* executor will not be {@linkplain ScheduledExecutorService#shutdown shutdown} when this service
   * {@linkplain Service.State#TERMINATED terminates} or {@linkplain Service.State#TERMINATED
   * fails}. Subclasses may override this method to supply a custom {@link ScheduledExecutorService}
   * instance. This method is guaranteed to only be called once.
   *

     * State#FAILED fail}/{@linkplain State#TERMINATED terminate} before all other services have
     * started {@linkplain State#RUNNING running} then this method will not be called.
     */
    public void healthy() {}

    /**
     * Called when the all of the component services have reached a terminal state, either
     * {@linkplain State#TERMINATED terminated} or {@linkplain State#FAILED failed}.
     */

     * State#FAILED fail}/{@linkplain State#TERMINATED terminate} before all other services have
     * started {@linkplain State#RUNNING running} then this method will not be called.
     */
    public void healthy() {}

    /**
     * Called when the all of the component services have reached a terminal state, either
     * {@linkplain State#TERMINATED terminated} or {@linkplain State#FAILED failed}.
     */

unlike with a regular call, program execution does not wait
for the invoked function to complete.
Instead, the function begins executing independently
in a new goroutine.
When the function terminates, its goroutine also terminates.
If the function has any return values, they are discarded when the
function completes.
</p>

<pre>
go Server()
go func(ch chan&lt;- bool) { for { sleep(10); ch &lt;- true }} (c)

unlike with a regular call, program execution does not wait
for the invoked function to complete.
Instead, the function begins executing independently
in a new goroutine.
When the function terminates, its goroutine also terminates.
If the function has any return values, they are discarded when the
function completes.
</p>

<pre>
go Server()
go func(ch chan&lt;- bool) { for { sleep(10); ch &lt;- true }} (c)

5. Termination
--------------

5.1. The rights granted under this License will terminate automatically
if You fail to comply with any of its terms. However, if You become
compliant, then the rights granted under this License from a particular
Contributor are reinstated (a) provisionally, unless and until such
Contributor explicitly and finally terminates Your grants, and (b) on an
ongoing basis, if such Contributor fails to notify You of the

                logger.error("IndexUpdater is terminated.", e);
            } else if (logger.isInfoEnabled()) {
                logger.info("IndexUpdater is terminated.");
            }
            forceStop();
        } catch (final Throwable t) {
            if (ComponentUtil.available()) {
                logger.error("IndexUpdater is terminated.", t);
            } else if (logger.isDebugEnabled()) {

    } finally {
      if (t.getState() != Thread.State.TERMINATED) {
        t.interrupt();
        fail("Test timed out");
      }
    }
  }

  /**
   * Waits for LONG_DELAY_MS milliseconds for the thread to terminate (using {@link
   * Thread#join(long)}), else interrupts the thread (in the hope that it may terminate later) and
   * fails.
   */
  void awaitTermination(Thread t) {

   *
   * @param service the {@code ExecutorService} to shut down
   * @param timeout the maximum time to wait for the {@code ExecutorService} to terminate
   * @return {@code true} if the {@code ExecutorService} was terminated successfully, {@code false}
   *     if the call timed out or was interrupted
   * @since 28.0 (but only since 33.4.0 in the Android flavor)
   */
  @CanIgnoreReturnValue

    } finally {
      if (t.getState() != Thread.State.TERMINATED) {
        t.interrupt();
        fail("Test timed out");
      }
    }
  }

  /**
   * Waits for LONG_DELAY_MS milliseconds for the thread to terminate (using {@link
   * Thread#join(long)}), else interrupts the thread (in the hope that it may terminate later) and
   * fails.
   */
  void awaitTermination(Thread t) {