synchronized (lock) {
      return shutdown;
    }
  }

  @Override
  public void shutdown() {
    synchronized (lock) {
      shutdown = true;
      if (runningTasks == 0) {
        lock.notifyAll();
      }
    }
  }

  // See newDirectExecutorService javadoc for unusual behavior of this method.
  @Override
  public List<Runnable> shutdownNow() {
    shutdown();
    return Collections.emptyList();

            if (!set) {
                synchronized (this) {
                    if (!set) {
                        this.set = true;
                        this.model = supplier.get();
                        this.notifyAll();
                    }
                }
            }
            return model;
        }
    }

    DefaultTransformerContext(ModelLocator modelLocator) {
        this.modelLocator = modelLocator;