* It extends {@link LinkedHashMap} without synchronization. If multiple threads access
 * an instance concurrently, and at least one thread modifies the map structurally,
 * it must be synchronized externally.
 * </p>
 * <p>
 * For thread-safe usage, wrap with {@link java.util.Collections#synchronizedMap(Map)}:
 * </p>
 * <pre>
 * Map&lt;K, V&gt; syncMap = Collections.synchronizedMap(new LruHashMap&lt;&gt;(100));

            // Test implementation
        }
    }

    // ========== Thread Safety Tests for getDataStoreNames() ==========

    /**
     * Test concurrent getDataStoreNames calls to verify synchronized method works correctly.
     * Multiple threads call getDataStoreNames() simultaneously.
     */
    @Test
    public void test_getDataStoreNames_concurrentAccess() throws Exception {

 * {@link Map} specified in the {@link Table} interface.
 *
 * <p>Note that this implementation is not synchronized. If multiple threads access this table
 * concurrently and one of the threads modifies the table, it must be synchronized externally.
 *
 * <p>See the Guava User Guide article on <a href=
 * "https://github.com/google/guava/wiki/NewCollectionTypesExplained#table">{@code Table}</a>.
 *

            dataMap.put(fessConfig.getIndexFieldDocId(), systemHelper.generateDocId(dataMap));
        }

        ComponentUtil.getLanguageHelper().updateDocument(dataMap);

        synchronized (docList) {
            docList.add(ingest(paramMap, dataMap));
            final long contentSize = indexingHelper.calculateDocumentSize(dataMap);
            docList.addContentSize(contentSize);

            throw new SQLRuntimeException(e);
        }
    }

    /**
     * Deregisters all JDBC drivers associated with the current class loader.
     */
    public static synchronized void deregisterAllDrivers() {
        for (final Enumeration<Driver> e = DriverManager.getDrivers(); e.hasMoreElements();) {
            deregisterDriver(e.nextElement());
        }
    }

        handle.sendrecv(rpc);
        if (rpc.retval != 0) {
            throw new SmbException(rpc.retval, false);
        }
        this.opened = true;
    }

    @Override
    public synchronized void close() throws IOException {
        if (this.opened) {
            this.opened = false;
            final MsrpcSamrCloseHandle rpc = new MsrpcSamrCloseHandle(this);
            this.handle.sendrecv(rpc);

    }

    /**
     * Plexus: Populates the lifecycle map from the injected list of lifecycle mappings (if not already done).
     */
    private synchronized void initLifecycleMap() {
        if (lifecycleMap == null) {
            lifecycleMap = new HashMap<>();

            if (lifecycles != null) {
                for (Lifecycle lifecycle : lifecycles) {

    }

    @Test
    public void test_crawlerList_synchronization() {
        // Test that the crawler list is synchronized
        List<org.codelibs.fess.crawler.Crawler> crawlerList = webFsIndexHelper.crawlerList;
        assertTrue(crawlerList.getClass().getName().contains("Synchronized"));
    }

    @Test
    public void test_defaultValues() {

    @Override
    public DefaultSettingsBuildingRequest setSystemProperties(Properties systemProperties) {
        if (systemProperties != null) {
            this.systemProperties = new Properties();
            synchronized (systemProperties) { // avoid concurrent modification if someone else sets/removes an unrelated
                // system property
                this.systemProperties.putAll(systemProperties);
            }

     *
     * @return The compiled Pattern for sensitive key matching
     */
    private static Pattern getSensitivePattern() {
        if (sensitivePattern == null) {
            synchronized (SystemUtil.class) {
                if (sensitivePattern == null) {
                    final String patternStr = System.getProperty(FessConfig.APP_LOG_SENSITIVE_PROPERTY_PATTERN, DEFAULT_SENSITIVE_PATTERN);