this.latch = latch;
    }

    @Override
    protected void doAction() {
      latch.countDown();
    }
  }

  private static class EnableWrites extends DelayedActionRunnable {
    private final BlockingQueue<String> queue;

    EnableWrites(BlockingQueue<String> queue, long tMinus) {
      super(tMinus);
      assertFalse(queue.isEmpty());
      assertFalse(queue.offer("shouldBeRejected"));