*/
    @ValidateTypeFailure
    public Long updatedTime;

    /**
     * The version number of the web configuration for optimistic locking.
     * This field is required to prevent concurrent modification conflicts
     * by ensuring the configuration hasn't been modified by another process.
     */
    @Required
    @ValidateTypeFailure
    public Integer versionNo;

```
src/main/java/org/codelibs/core/
├── beans/       # Bean manipulation & introspection (converter/, factory/, impl/, util/)
├── collection/  # Enhanced collections (LruHashMap, CaseInsensitiveMap)
├── concurrent/  # Concurrency utilities
├── convert/     # Type conversion (*ConversionUtil)
├── crypto/      # Cipher & encryption (CachedCipher)
├── exception/   # Runtime exception wrappers
├── io/          # I/O & resource utilities

import java.io.IOException;
import java.io.InputStream;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Test class for SMB file locking operations.
 * This class is used to test concurrent file access and locking behavior.
 */
public class TestLocking implements Runnable {

    private static final Logger logger = LoggerFactory.getLogger(TestLocking.class);

    /**

    /**
     * Gets the maximum number of concurrent requests to the LLM provider.
     * Default is 5. Override or configure via rag.llm.{provider}.max.concurrent.requests.
     *
     * @return the maximum concurrent requests
     */
    protected int getMaxConcurrentRequests() {
        return Integer.parseInt(ComponentUtil.getFessConfig().getOrDefault(getConfigPrefix() + ".max.concurrent.requests", "5"));
    }

    /**

        }
    }

    /**
     * Test cache refresh mechanism with concurrent access.
     * Verifies that cache is refreshed correctly even with concurrent readers.
     */
    @Test
    public void test_cacheRefresh_withConcurrentReads() throws Exception {
        final int[] loadCount = { 0 };

	peerRESTIsGroup         = "is-group"
	peerRESTSignal          = "signal"
	peerRESTSubSys          = "sub-sys"
	peerRESTProfiler        = "profiler"
	peerRESTSize            = "size"
	peerRESTConcurrent      = "concurrent"
	peerRESTDuration        = "duration"
	peerRESTStorageClass    = "storage-class"
	peerRESTEnableSha256    = "enableSha256"
	peerRESTEnableMultipart = "enableMultipart"
	peerRESTAccessKey       = "access-key"

     */
    @ValidateTypeFailure
    public Long updatedTime;

    /**
     * The version number of the group for optimistic locking.
     * This field is required to prevent concurrent modification conflicts
     * by ensuring the group hasn't been modified by another process.
     */
    @Required
    @ValidateTypeFailure
    public Integer versionNo;

                try {
                    for (int j = 0; j < urlsPerThread; j++) {
                        // Access is synchronized internally in the actual implementation
                        // Here we just verify no concurrent modification exceptions occur
                        String url = "http://example.com/thread" + threadIndex + "/doc" + j;
                        // Simulate the synchronized access that happens in deleteDocument()

import java.time.Duration;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.CancellationException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

     */
    @ValidateTypeFailure
    public Long updatedTime;

    /**
     * The version number of the related content configuration for optimistic locking.
     * This field is required to prevent concurrent modification conflicts
     * by ensuring the configuration hasn't been modified by another process.
     */
    @Required
    @ValidateTypeFailure
    public Integer versionNo;