assertTrue(Thread.holdsLock(mutex));
    return super.isEmpty();
  }

  /*
   * We don't assert that the lock is held during calls to iterator(), stream(), and spliterator:
   * `Synchronized` doesn't guarantee that it will hold the mutex for those calls because callers
   * are responsible for taking the mutex themselves:

 *   // do other things since the monitor was not available
 * }
 * }
 *
 * <h2>Comparison with {@code synchronized} and {@code ReentrantLock}</h2>
 *
 * <p>The following examples show a simple threadsafe holder expressed using {@code synchronized},
 * {@link ReentrantLock}, and {@code Monitor}.
 *
 * <h3>{@code synchronized}</h3>
 *
 * <p>This version is the fewest lines of code, largely because the synchronization mechanism used

  static class Key {
    private final int value;
    private WeakReference<String> toString;

    Key(int value) {
      this.value = value;
    }

    @Override
    public synchronized String toString() {
      String s;
      if (toString != null) {
        s = toString.get();
        if (s != null) {
          return s;
        }
      }
      s = Integer.toString(value);

        .suppressing(suppressForEnumSet())
        .createTestSuite();
  }

  /**
   * Tests regular NavigableSet behavior of synchronizedNavigableSet(treeSet); does not test the
   * fact that it's synchronized.
   */
  public Test testsForSynchronizedNavigableSet() {
    return NavigableSetTestSuiteBuilder.using(
            new TestStringSortedSetGenerator() {
              @Override

        }
    }

    public void test_evaluate_concurrency() {
        queryRescorer = new QueryRescorer() {
            private int callCount = 0;

            @Override
            public synchronized RescorerBuilder<?> evaluate(Map<String, Object> params) {
                callCount++;
                if (callCount % 2 == 0) {
                    return createMockRescorerBuilder();
                }

 * Provides utility methods for URL processing, site extraction, data mapping,
 * and field configuration handling during the document transformation process.
 */
public interface FessTransformer {

    /**
     * Synchronized LRU cache for storing parent URL encodings.
     * Maps session+parent URL keys to their corresponding character encodings.
     */
    Map<String, String> parentEncodingMap = Collections.synchronizedMap(new LruHashMap<>(1000));

     * @param path The path to match.
     * @return A set of matched label values.
     */
    public Set<String> getMatchedLabelValueSet(final String path) {
        if (labelTypePatternList == null) {
            synchronized (this) {
                if (labelTypePatternList == null) {
                    buildLabelTypePatternList(ComponentUtil.getComponent(LabelTypeService.class).getLabelTypeList());
                }
            }

 * strategies.
 *
 * <ul>
 *   <li>SafeAtomicHelper: uses Atomic FieldsUpdaters to implement synchronization
 *   <li>SynchronizedHelper: uses {@code synchronized} blocks for synchronization
 * </ul>
 *
 * To force selection of our fallback strategies we load {@link AggregateFutureState} (and all of

            }
            destroyContainer();
        }

        System.exit(exitCode);
    }

    private static void destroyContainer() {
        TimeoutManager.getInstance().stop();
        synchronized (SingletonLaContainerFactory.class) {
            SingletonLaContainerFactory.destroy();
        }
    }

    private static int process(final Options options) {

            if (pattern.matcher(input).matches()) {
                return Constants.FALSE;
            }
        }

        return Constants.TRUE;
    }

    protected synchronized void initDocUrlPattern() {

        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();
        if (includedDocUrlPatterns == null) {
            if (StringUtil.isNotBlank(getIncludedDocUrls())) {