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();

    /**

 *
 * <p>The crawler uses several services and components, such as UrlQueueService, DataService,
 * UrlFilter, RuleManager, CrawlerContainer, IntervalController, and CrawlerClientFactory,
 * to perform its tasks.
 *
 * <p>The crawling process involves the following steps:
 * <ol>
 *   <li>Initialization: Sets up the crawler context and initializes the URL filter.</li>

 * It uses various services and components, such as {@link UrlQueueService}, {@link DataService},
 * {@link CrawlerContainer}, {@link LogHelper}, {@link CrawlerClientFactory}, and {@link CrawlerContext},
 * to perform its tasks.
 * </p>
 *
 * <p>
 * The crawling process involves the following steps:
 * </p>
 * <ol>
 *   <li>Fetching a URL from the queue using {@link UrlQueueService#poll(String)}.</li>

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

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

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

                }
            }, Thread.currentThread().getName() + "-pdf");
            task.setDaemon(isDaemonThread);
            task.start();
            task.join(timeout);
            if (!done.get()) {
                for (int i = 0; i < 100 && !done.get(); i++) {
                    task.interrupt();
                    ThreadUtil.sleep(100L);
                }

				"application/dialog-info+xml",
				"application/dicom",
				"application/dita+xml",
				"application/dita+xml;format=map",
				"application/dita+xml;format=topic",
				"application/dita+xml;format=task",
				"application/dita+xml;format=concept",
				"application/dita+xml;format=val",
				"application/dns",
				"application/dvcs",
				"application/ecmascript",
				"application/edi-consent",

    <!-- Topic is the default, Task and Concept are specialisations -->
    <glob pattern="*.dita"/>
  </mime-type>
  <mime-type type="application/dita+xml;format=task">
    <sub-class-of type="application/dita+xml"/>
    <_comment>DITA Task Topic</_comment>
    <root-XML localName="task"/>
    <root-XML localName="task" namespaceURI="http://docs.oasis-open.org/namespace"/>
  </mime-type>

    private final List<Header> requestHeaderList = new ArrayList<>();

    /** Map of HTTP client properties */
    private final Map<String, Object> httpClientPropertyMap = new HashMap<>();

    /** Task for monitoring idle connections */
    private TimeoutTask connectionMonitorTask;

    /** Connection timeout in milliseconds */
    protected Integer connectionTimeout;