/**
     * The crawler is initializing.
     */
    INITIALIZING,

    /**
     * The crawler is currently running.
     */
    RUNNING,

    /**
     * The crawler has completed its task.
     */
    DONE;

                return 0;
            }
        };

        // Callableタスクを複数生成
        final List<Callable<Integer>> tasks = new ArrayList<Callable<Integer>>();
        for (int i = 0; i < numTasks; i++) {
            tasks.add(testCallable);
        }

        // 時間取得
        final long time = System.nanoTime();

        // Callableタスク(複数)を実行する

     *
     * @return true if the crawler container is available, false otherwise.
     */
    boolean available();

    /**
     * Cleans up resources and performs any necessary finalization tasks
     * before the object is destroyed. This method should be called to
     * ensure that all resources are properly released.
     */
    void destroy();

    /**