synchronized (crawlerContext.activeThreadCountLock) {
            crawlerContext.activeThreadCount++;
        }
    }

    /**
     * Decrements the active thread count.
     */
    protected void finishCrawling() {
        synchronized (crawlerContext.activeThreadCountLock) {
            crawlerContext.activeThreadCount--;
        }
    }

    /**

        // Test with special characters
        crawlerContext.setSessionId("session-with-特殊文字-#123");
        assertEquals("session-with-特殊文字-#123", crawlerContext.getSessionId());
    }

    /**
     * Test activeThreadCount getter and setter
     */
    public void test_activeThreadCount() {
        assertEquals(0, crawlerContext.getActiveThreadCount().intValue());

        crawlerContext.setActiveThreadCount(5);