if (crawlerContext.intervalController != null) {
                        crawlerContext.intervalController.delay(IntervalController.NO_URL_IN_QUEUE);
                    }

                    threadCheckCount++;
                }

                // interval
                if (crawlerContext.intervalController != null) {

        @Override
        public boolean hasRule(Rule rule) {
            return false;
        }
    }

    /**
     * Test implementation of IntervalController for testing
     */
    private static class TestIntervalController implements IntervalController {
        @Override
        public void delay(int type) {
        }

        public void delayBeforeProcessing() {
        }

String sessionId2 = crawler2.execute();

crawler1.awaitTermination();
crawler2.awaitTermination();
```

### Custom Interval Control

```java
// Configure politeness policy
container.singleton("intervalController", DefaultIntervalController.class, controller -> {
    controller.setDelayMillisForWaitingNewUrl(5000);
    controller.setDefaultIntervalTime(1000);
});
```

### Sitemap Support

```java

                .prototype("dataService", DataServiceImpl.class)
                .prototype("urlFilter", UrlFilterImpl.class)
                .singleton("urlConvertHelper", UrlConvertHelper.class)
                .singleton("intervalController", DefaultIntervalController.class)
                .singleton("sitemapsHelper", SitemapsHelper.class)
                .singleton("logHelper", LogHelperImpl.class)