final int[] callCount = { 0 };

        SearchLogHelper mockSearchLogHelper = new SearchLogHelper() {
            @Override
            public void storeSearchLog() {
                synchronized (lock) {
                    callCount[0]++;
                    if (callCount[0] % 2 == 0) {
                        throw new RuntimeException("Even call error");
                    }

                            List<Map<String, Object>> results =
                                    processor.search("*", new TestSearchRequestParams(0, 10, 0), OptionalThing.empty());
                            synchronized (allResults) {
                                allResults.add(results);
                            }
                        } catch (InterruptedException e) {

  }

  static class DecoupledClassLoader extends URLClassLoader {

    public DecoupledClassLoader(URL[] urls) {
      super(urls);
    }

    @Override
    protected synchronized Class<?> loadClass(String name, boolean resolve)
        throws ClassNotFoundException {
      // Force Finalizer to load from this class loader, not its parent.
      if (name.equals(Finalizer.class.getName())) {

                            synchronized (project) {
                                cleanProjectLocalRepository(project);
                            }
                        }
                    }
                }
                break;
            case ProjectSucceeded:
            case ForkedProjectSucceeded:
                synchronized (project) {

        toArrayCalled = true;
        return super.toArray(a);
      }
    }

    // Test that toArray() is used to make a defensive copy in copyOf(), so concurrently modified
    // synchronized collections can be safely copied.
    TestArrayList<String> toCopy = new TestArrayList<>();
    ImmutableSortedMultiset<String> unused =
        ImmutableSortedMultiset.copyOf(Ordering.natural(), toCopy);

    }

    @Test
    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();
                }

            }
            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())) {

     * every 60 seconds to balance performance with up-to-date plugin discovery.
     *
     * @return array of data store names sorted alphabetically, never null
     */
    public synchronized String[] getDataStoreNames() {
        final long now = ComponentUtil.getSystemHelper().getCurrentTimeAsLong();
        if (now - lastLoadedTime > 60000L) {
            final List<String> nameList = loadDataStoreNameList();

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

        return Constants.TRUE;

    }

    protected synchronized void initDocPathPattern() {
        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();

        if (includedDocPathPatterns == null) {
            if (StringUtil.isNotBlank(getIncludedDocPaths())) {