protected String loggerName = "fess.log.crawler.stats";

    /** Maximum number of statistics objects to cache. */
    protected long maxCacheSize = 1000;

    /** Time in milliseconds after which cache entries expire after write. */
    protected long cacheExpireAfterWrite = 10 * 60 * 1000L;

    /** Cache for storing statistics objects keyed by crawler object identifiers. */
    protected LoadingCache<String, StatsObject> statsCache;

        rDataLengthField.setAccessible(true);
        rDataLengthField.set(response, dataLength);

        // Number of names
        src[srcIndex] = (byte) numNames;

        // Fill in name entries
        for (int i = 0; i < numNames; i++) {
            String name = String.format("NAME%02d          ", i).substring(0, 16);
            System.arraycopy(name.getBytes("US-ASCII"), 0, src, srcIndex + 1 + (i * 18), 16);

        }
        
        // Verify caching behavior
        assertTrue(file.canCacheWrite());
    }
}
```

## 9. Performance Considerations

### 9.1 Memory Management
- Lease entries should be evicted based on LRU when max leases reached
- Implement periodic cleanup of expired leases

### 9.2 Thread Safety
- Use concurrent data structures for lease storage
- Minimize lock contention in hot paths

type BucketMetadataSys struct {
	objAPI ObjectLayer

	sync.RWMutex
	initialized bool
	group       *singleflight.Group
	metadataMap map[string]BucketMetadata
}

// Count returns number of bucket metadata map entries.
func (sys *BucketMetadataSys) Count() int {
	sys.RLock()
	defer sys.RUnlock()

	return len(sys.metadataMap)
}

// Remove bucket metadata from memory.
func (sys *BucketMetadataSys) Remove(buckets ...string) {

    public void test_putToInfoMap() {
        // Test initial null map
        crawlingInfoHelper.putToInfoMap("key1", "value1");
        assertNotNull(crawlingInfoHelper.infoMap);

        // Test adding multiple entries
        crawlingInfoHelper.putToInfoMap("key2", "value2");
        crawlingInfoHelper.putToInfoMap("key3", "value3");

        assertEquals("value1", crawlingInfoHelper.infoMap.get("key1"));

        assertEquals(3, tags.length);

        // Test with whitespace
        tags = PrunedTag.parse(" div.test , span#id , a[target=_blank] ");
        assertEquals(3, tags.length);

        // Test with empty entries
        tags = PrunedTag.parse("div,,span,");
        assertEquals(2, tags.length);
    }

    @Test
    public void test_parse_edgeCases() {
        // Test empty string

            pathToLease.clear();
        } finally {
            lock.writeLock().unlock();
        }
    }

    /**
     * Get all active leases
     *
     * @return map of lease keys to lease entries
     */
    public Map<Smb2LeaseKey, LeaseEntry> getAllLeases() {
        return new ConcurrentHashMap<>(leases);
    }

    /**
     * Clean up expired leases
     *

                    return window < currentWindow - 2; // Keep current and previous window
                } catch (NumberFormatException e) {
                    return true; // Remove invalid entries
                }
            }
            return true;
        });
    }

    private void addMdcContext(Map<String, Object> context) {
        // Add MDC context efficiently

    /**
     * Cache for storing resource file modification timestamps to enable cache busting.
     * The cache expires after 10 minutes and has a maximum size of 1000 entries.
     */
    private static LoadingCache<String, Long> resourceHashCache =
            CacheBuilder.newBuilder().maximumSize(1000).expireAfterWrite(10, TimeUnit.MINUTES).build(new CacheLoader<String, Long>() {

		bucket:         bucketName,
		recursive:      true,
		forwardTo:      "",
		minDisks:       listingQuorum,
		reportNotFound: false,
		agreed:         fn,
		partial: func(entries metaCacheEntries, _ []error) {
			entry, ok := entries.resolve(&resolver)
			if ok {
				fn(*entry)
			}
		},
		finished: nil,
	})
	return err
}

// rebalanceBucket rebalances objects under bucket in poolIdx pool