final Map<Path, Holder> modelByPath = new ConcurrentHashMap<>();

    final Map<GAKey, Holder> modelByGA = new ConcurrentHashMap<>();

    public static class Holder {
        private volatile boolean set;
        private volatile Model model;

        Holder() {}

        Holder(Model model) {
            this.model = Objects.requireNonNull(model);

// NewDeadlineWorker constructs a new DeadlineWorker with the given timeout.
// To return values, use the WithDeadline helper instead.
func NewDeadlineWorker(timeout time.Duration) *DeadlineWorker {
	dw := &DeadlineWorker{
		timeout: timeout,
	}
	return dw
}

// Run runs the given function, passing it a stopper channel. If the deadline passes before
// the function finishes executing, Run returns context.DeadlineExceeded to the caller.

							<mapper>
								<type>perm</type>
								<user>${packaging.fess.user}</user>
								<group>${packaging.fess.group}</group>
							</mapper>
						</data>
						<data>
							<type>directory</type>
							<src>${project.build.directory}/fess/WEB-INF/classes/org/codelibs/fess/tomcat</src>
							<mapper>
								<type>perm</type>

                Model model = findRawModel(from, gId, aId);
                if (model != null) {
                    context.modelByGA.put(new GAKey(gId, aId), new Holder(model));
                    context.modelByPath.put(model.getPomFile(), new Holder(model));
                }
                return model;
            }

            @Override
            public Model getRawModel(Path from, Path path) {

                return plugin;
            }
        });
    }

    static <T> List<T> map(List<T> list, Function<T, T> mapper) {
        List<T> newList = list;
        for (int i = 0; i < newList.size(); i++) {
            T oldT = newList.get(i);
            T newT = mapper.apply(oldT);
            if (newT != oldT) {
                if (newList == list) {
                    newList = new ArrayList<>(list);

  private static final long SPIN_THRESHOLD_NANOS = 1000L;

  private static final AtomicHelper ATOMIC_HELPER;

  static {
    AtomicHelper helper;
    Throwable thrownUnsafeFailure = null;
    Throwable thrownAtomicReferenceFieldUpdaterFailure = null;

    try {
      helper = new UnsafeAtomicHelper();
    } catch (Exception | Error unsafeFailure) { // sneaky checked exception

        }
        return model;
    }

    private <T> List<T> map(List<T> resources, Function<T, T> mapper) {
        List<T> newResources = null;
        if (resources != null) {
            for (int i = 0; i < resources.size(); i++) {
                T resource = resources.get(i);
                T newResource = mapper.apply(resource);
                if (newResource != null) {
                    if (newResources == null) {

	data, err := json.Marshal(bucketPolicy)
	if err != nil {
		// This should not happen because bucketPolicy is valid to convert to JSON data.
		return nil, err
	}

	var policyInfo miniogopolicy.BucketAccessPolicy
	json := jsoniter.ConfigCompatibleWithStandardLibrary
	if err = json.Unmarshal(data, &policyInfo); err != nil {
		// This should not happen because data is valid to JSON data.
		return nil, err
	}

        }
        return clazz.cast(o);
    }

    static <U, V> List<V> map(Collection<U> list, Function<U, V> mapper) {
        return list.stream().map(mapper).collect(Collectors.toList());
    }

# Exceptions - `HTTPException` and `WebSocketException`

These are the exceptions that you can raise to show errors to the client.

When you raise an exception, as would happen with normal Python, the rest of the execution is aborted. This way you can raise these exceptions from anywhere in the code to abort a request and show the error to the client.

You can use:

* `HTTPException`
* `WebSocketException`