async def _shutdown(self) -> None:
        """
        Run any `.on_shutdown` event handlers.

        This method is kept for backward compatibility after Starlette removed
        support for on_startup/on_shutdown handlers.

        Ref: https://github.com/Kludex/starlette/pull/3117
        """
        for handler in self.on_shutdown:
            if is_async_callable(handler):

    // TODO(cpovirk): implement interruption, updating this test:
    // https://github.com/google/guava/issues/1989
    assertEquals(1, gotException.getCount());
    // gotException.await();
    service.shutdown();
    service.awaitTermination(30, SECONDS);
  }

  public void testTransformAsync_cancelPropagatesToAsyncOutput() throws Exception {
    ListenableFuture<Foo> immediate = immediateFuture(new Foo());

    // TODO(cpovirk): implement interruption, updating this test:
    // https://github.com/google/guava/issues/1989
    assertEquals(1, gotException.getCount());
    // gotException.await();
    service.shutdown();
    service.awaitTermination(30, SECONDS);
  }

  public void testTransformAsync_cancelPropagatesToAsyncOutput() throws Exception {
    ListenableFuture<Foo> immediate = immediateFuture(new Foo());

                """
            ),
        ] = None,
        on_shutdown: Annotated[
            Sequence[Callable[[], Any]] | None,
            Doc(
                """
                A list of shutdown event handler functions.

                You should instead use the `lifespan` handlers.

                Read more in the

HSPLokhttp3/internal/concurrent/TaskQueue;->schedule(Lokhttp3/internal/concurrent/Task;J)V
HSPLokhttp3/internal/concurrent/TaskQueue;->scheduleAndDecide$okhttp(Lokhttp3/internal/concurrent/Task;JZ)Z
HSPLokhttp3/internal/concurrent/TaskQueue;->shutdown()V
HSPLokhttp3/internal/concurrent/TaskRunner$RealBackend;-><init>(Ljava/util/concurrent/ThreadFactory;)V
HSPLokhttp3/internal/concurrent/TaskRunner$RealBackend;->coordinatorNotify(Lokhttp3/internal/concurrent/TaskRunner;)V

	s.accessKey = s.testServer.AccessKey
	s.secretKey = s.testServer.SecretKey
}

func (s *TestSuiteCommon) RestartTestServer(c *check) {
	// Shutdown.
	s.testServer.cancel()
	s.testServer.Server.Close()
	s.testServer.Obj.Shutdown(context.Background())

	// Restart.
	ctx, cancel := context.WithCancel(context.Background())

	s.testServer.cancel = cancel

      threadAboutToBlockForRefresh.set(Thread.currentThread());
      assertThat(cache.getOrLoad("test")).isEqualTo("testReload");
    } finally {
      refreshExecutor.shutdown();
    }
  }

  public void testSetRemovalListener() {
    RemovalListener<Object, Object> testListener = TestingRemovalListeners.nullRemovalListener();
    LocalCache<Object, Object> map =

      threadAboutToBlockForRefresh.set(Thread.currentThread());
      assertThat(cache.getOrLoad("test")).isEqualTo("testReload");
    } finally {
      refreshExecutor.shutdown();
    }
  }

  public void testSetRemovalListener() {
    RemovalListener<Object, Object> testListener = TestingRemovalListeners.nullRemovalListener();
    LocalCache<Object, Object> map =