java.util.concurrent.CompletionStage Java Examples

/**
 * Given a draft of {@code D} (e.g. {@link CategoryDraft}) this method attempts to resolve it's custom type
 * reference to return {@link CompletionStage} which contains a new instance of the draft with the resolved
 * custom type reference. The key of the custom type is taken from the from the id field of the reference.
 *
 * <p>The method then tries to fetch the key of the custom type, optimistically from a
 * cache. If the key is is not found, the resultant draft would remain exactly the same as the passed
 * draft (without a custom type reference resolution).
 *
 * @param draftBuilder the draft builder to resolve it's references.
 * @param customGetter a function to return the CustomFieldsDraft instance of the draft builder.
 * @param customSetter a function to set the CustomFieldsDraft instance of the builder and return this builder.
 * @param errorMessage the error message to inject in the {@link ReferenceResolutionException} if it occurs.
 * @return a {@link CompletionStage} that contains as a result a new draft instance with resolved custom
 *         type references or, in case an error occurs during reference resolution,
 *         a {@link ReferenceResolutionException}.
 */
@Nonnull
protected CompletionStage<B> resolveCustomTypeReference(
    @Nonnull final B draftBuilder,
    @Nonnull final Function<B, CustomFieldsDraft> customGetter,
    @Nonnull final BiFunction<B, CustomFieldsDraft, B> customSetter,
    @Nonnull final String errorMessage) {

    final CustomFieldsDraft custom = customGetter.apply(draftBuilder);
    if (custom != null) {
        return getCustomTypeId(custom, errorMessage)
            .thenApply(resolvedTypeIdOptional ->
                resolvedTypeIdOptional.map(resolvedTypeId ->
                    customSetter.apply(draftBuilder, ofTypeIdAndJson(resolvedTypeId, custom.getFields())))
                                      .orElse(draftBuilder));
    }
    return CompletableFuture.completedFuture(draftBuilder);
}
 

private Source<SudoRetrieveThingResponse, NotUsed> sudoRetrieveThing(final ThingId thingId) {
    final SudoRetrieveThing command =
            SudoRetrieveThing.withOriginalSchemaVersion(thingId, DittoHeaders.empty());
    final CompletionStage<Source<SudoRetrieveThingResponse, NotUsed>> responseFuture =
            // using default thread-pool for asking Things shard region
            Patterns.ask(thingsShardRegion, command, thingsTimeout)
                    .handle((response, error) -> {
                        if (response instanceof SudoRetrieveThingResponse) {
                            return Source.single((SudoRetrieveThingResponse) response);
                        } else {
                            if (error != null) {
                                log.error("Failed " + command, error);
                            } else if (!(response instanceof ThingNotAccessibleException)) {
                                log.error("Unexpected response for <{}>: <{}>", command, response);
                            }
                            return Source.empty();
                        }
                    });

    return Source.fromSourceCompletionStage(responseFuture)
            .viaMat(Flow.create(), Keep.none());
}
 

/**
 * Unregister all currently registered clusters.
 *
 * @return future that is completed when all clusters are unregistered.
 */
public CompletionStage<Integer> unregisterAllAsync() {
  if (isClosed()) {
    return failByClose();
  }
  List<CompletableFuture<BoundCluster>> futures =
      clusters
          .keySet()
          .stream()
          .map(this::unregisterAsync)
          .map(CompletionStage::toCompletableFuture)
          .collect(Collectors.toList());

  return CompletableFuture.allOf(futures.toArray(new CompletableFuture[] {}))
      .thenApply(__ -> futures.size());
}
 

@Test
public void testClosePipeline() {
  final AtomicBoolean closed = new AtomicBoolean();
  final AsyncIterator<Long> ai =
      new AsyncIterator<Long>() {
        @Override
        public CompletionStage<Either<End, Long>> nextStage() {
          return StageSupport.completedStage(Either.right(1L));
        }

        @Override
        public CompletionStage<Void> close() {
          closed.set(true);
          return StageSupport.voidStage();
        }
      }.take(10);
  final AsyncIterator<?> intermediateAi = this.intermediate.apply(ai);
  this.terminal.apply(intermediateAi).toCompletableFuture().join();
  Assert.assertFalse(closed.get());
  intermediateAi.close().toCompletableFuture().join();
  Assert.assertTrue(closed.get());
}
 

@SuppressWarnings("unchecked")
private CompletionStage<?> executeCompletionStage(MethodInvocation invocation,
    CompletionStage<?> stage, io.github.resilience4j.retry.Retry.Context context,
    RecoveryFunction<?> recoveryFunction) {
    final CompletableFuture promise = new CompletableFuture();
    stage.whenComplete((v, t) -> {
        if (t != null) {
            try {
                context.onError((Exception) t);
                CompletionStage next = (CompletionStage) invocation.proceed();
                CompletableFuture temp = executeCompletionStage(invocation, next, context,
                    recoveryFunction).toCompletableFuture();
                promise.complete(temp.join());
            } catch (Throwable t2) {
                completeFailedFuture(t2, recoveryFunction, promise);
            }
        } else {
            context.onComplete();
            promise.complete(v);
        }
    });
    return promise;
}
 

default CompletionStage<ResultSet> executeReactiveQueryStatement(
		String sqlStatement,
		QueryParameters queryParameters,
		List<AfterLoadAction> afterLoadActions,
		SessionImplementor session) {

	// Processing query filters.
	queryParameters.processFilters( sqlStatement, session );

	// Applying LIMIT clause.
	final LimitHandler limitHandler = limitHandler( queryParameters.getRowSelection(), session );
	String sql = limitHandler.processSql( queryParameters.getFilteredSQL(), queryParameters.getRowSelection() );

	// Adding locks and comments.
	sql = preprocessSQL( sql, queryParameters, session.getSessionFactory(), afterLoadActions );

	return session.unwrap(ReactiveSession.class)
			.getReactiveConnection()
			.selectJdbc( sql, toParameterArray(queryParameters, session) );
}
 

/**
 * Like {@link CompletableFuture#supplyAsync(Supplier)} but for {@link ThrowingSupplier}.
 *
 * <p>If the {@link ThrowingSupplier} throws an exception, the future completes exceptionally.
 */
public static <T> CompletionStage<T> supplyAsync(
    ThrowingSupplier<T> supplier, ExecutorService executorService) {
  CompletableFuture<T> result = new CompletableFuture<>();

  CompletionStage<Void> wrapper =
      CompletableFuture.runAsync(
          () -> {
            try {
              result.complete(supplier.get());
            } catch (InterruptedException e) {
              result.completeExceptionally(e);
              Thread.currentThread().interrupt();
            } catch (Throwable t) {
              result.completeExceptionally(t);
            }
          },
          executorService);
  return wrapper.thenCompose(nothing -> result);
}
 

/**
 * Perform a POST operation on a LDP Resource.
 *
 * @param uriInfo the URI info
 * @param secContext the security context
 * @param headers the HTTP headers
 * @param request the request
 * @param body the body
 * @return the async response
 */
@POST
@Timed
@Operation(summary = "Create a linked data resource")
public CompletionStage<Response> createResource(@Context final Request request, @Context final UriInfo uriInfo,
        @Context final HttpHeaders headers, @Context final SecurityContext secContext,
        @RequestBody(description = "The new resource") final InputStream body) {
    final TrellisRequest req = new TrellisRequest(request, uriInfo, headers, secContext);
    final String urlBase = getBaseUrl(req);
    final String path = req.getPath();
    final String identifier = getIdentifier(req);
    final String separator = path.isEmpty() ? "" : "/";

    final IRI parent = buildTrellisIdentifier(path);
    final IRI child = buildTrellisIdentifier(path + separator + identifier);
    final PostHandler postHandler = new PostHandler(req, parent, identifier, body, trellis, extensions, urlBase);

    return trellis.getResourceService().get(parent)
        .thenCombine(trellis.getResourceService().get(child), postHandler::initialize)
        .thenCompose(postHandler::createResource).thenCompose(postHandler::updateMemento)
        .thenApply(ResponseBuilder::build).exceptionally(this::handleException);
}
 

@Test
public void testMarkdownPitchNotFound() throws Exception {

    TestServer server = testServer(3333);
    running(server, () -> {
        try {
            WSClient ws = play.libs.ws.WS.newClient(3333);
            CompletionStage<WSResponse> completionStage =
                    ws.url(MARKDOWN_PITCH_NOT_FOUND).get();
            WSResponse response = completionStage.toCompletableFuture().get();
            ws.close();
            assertEquals(OK, response.getStatus());
            assertEquals(CONTENT_TYPE_MD, response.getHeader(CONTENT_TYPE));
        } catch (Exception e) {
            log.error(e.getMessage(), e);
        }
    });
}
 

@Consumes(APPLICATION_JSON)
@Produces(APPLICATION_JSON)
@Path("/json")
@POST
public CompletionStage<Map<String, Object>> postJson(final Map<String, Object> requestContent) {
    final Map<String, Object> responseContent = new HashMap<>(requestContent);
    responseContent.put("foo", "bar1");
    return completedFuture(responseContent);
}
 

@Override
protected CompletionStage<Collection<M>> handleMessageAsync(M message, MessageCollector collector,
    TaskCoordinator coordinator) {
  Object key, value;
  if (outputStream.isKeyed()) {
    key = ((KV) message).getKey();
    value = ((KV) message).getValue();
  } else {
    key = null;
    value = message;
  }

  collector.send(new OutgoingMessageEnvelope(systemStream, null, key, value));
  return CompletableFuture.completedFuture(Collections.singleton(message));
}
 

/**
 * Indicates that the node should resume accepting connections.
 *
 * @return future that completes when node is listening again.
 */
@Override
public CompletionStage<Void> acceptConnectionsAsync() {
  logger.debug("Accepting New Connections");
  rejectState.set(new RejectState());
  // Reopen listening interface if not currently open.
  if (!channel.get().isOpen()) {
    return rebind();
  } else {
    return CompletableFuture.completedFuture(null);
  }
}
 

private <U extends T,V> CompletableFuture<V> orApplyStage(
    Executor e, CompletionStage<U> o,
    Function<? super T, ? extends V> f) {
    CompletableFuture<U> b;
    if (f == null || (b = o.toCompletableFuture()) == null)
        throw new NullPointerException();
    CompletableFuture<V> d = new CompletableFuture<V>();
    if (e != null || !d.orApply(this, b, f, null)) {
        OrApply<T,U,V> c = new OrApply<T,U,V>(e, d, this, b, f);
        orpush(b, c);
        c.tryFire(SYNC);
    }
    return d;
}
 

/**
 * this action method will be used to free Up user Identifier from user DB
 * @return
 */
public CompletionStage<Result> freeUpIdentifier(Http.Request httpRequest) {
    return handleRequest(
            ActorOperations.FREEUP_USER_IDENTITY.getValue(),
            httpRequest.body().asJson(),
            req -> {
                Request request = (Request) req;
                UserFreeUpRequestValidator.getInstance(request).validate();
                return null;
            },
            null,
            null,
            true,
            httpRequest);
}
 

public CompletionStage<Result> createUserV2(Http.Request httpRequest) {

  return handleRequest( ActorOperations.CREATE_USER.getValue(),
  httpRequest.body().asJson(), req -> { Request request = (Request) req; new
  UserRequestValidator().validateCreateUserV2Request(request);
  request.getContext().put(JsonKey.VERSION, JsonKey.VERSION_2); return null; },
  null, null, true, httpRequest);
 }
 

@Override
public <U> CompletionStage<Void> thenAcceptBothAsync(final CompletionStage<? extends U> other,
    final BiConsumer<? super T, ? super U> action, final Executor executor) {
  Objects.requireNonNull(action);
  return thenCombineAsync(other, (t, u) -> {
    action.accept(t, u);
    return null;
  }, executor);
}
 

private <U,V> CompletableFuture<V> biApplyStage(
    Executor e, CompletionStage<U> o,
    BiFunction<? super T,? super U,? extends V> f) {
    CompletableFuture<U> b;
    if (f == null || (b = o.toCompletableFuture()) == null)
        throw new NullPointerException();
    CompletableFuture<V> d = new CompletableFuture<V>();
    if (e != null || !d.biApply(this, b, f, null)) {
        BiApply<T,U,V> c = new BiApply<T,U,V>(e, d, this, b, f);
        bipush(b, c);
        c.tryFire(SYNC);
    }
    return d;
}
 

public <U> DependentPromise<U> applyToEitherAsync(CompletionStage<? extends T> other, 
                                                  Function<? super T, U> fn,
                                                  Executor executor,
                                                  Set<PromiseOrigin> enlistOptions) {
    
    return wrap(delegate.applyToEitherAsync(other, fn, executor), originAndParam(other, enlistOptions));
}
 

private <E extends Throwable, T> void retryIfCovered(
    E e, ScheduledExecutorService retryExecutor,
    CheckedSupplier<? extends CompletionStage<T>, ?> supplier, CompletableFuture<T> future)
        throws E {
  if (plan.covers(e)) {
    scheduleRetry(e, retryExecutor, supplier, future);
  } else {
    throw e;
  }
}
 

private CompletionStage<Void> checkIdClass(
		final EntityPersister persister,
		final LoadEvent event,
		final LoadEventListener.LoadType loadType,
		final Class<?> idClass) {
	// we may have the kooky jpa requirement of allowing find-by-id where
	// "id" is the "simple pk value" of a dependent objects parent.  This
	// is part of its generally goofy "derived identity" "feature"
	final IdentifierProperty identifierProperty = persister.getEntityMetamodel().getIdentifierProperty();
	if ( identifierProperty.isEmbedded() ) {
		final EmbeddedComponentType dependentIdType = (EmbeddedComponentType) identifierProperty.getType();
		if ( dependentIdType.getSubtypes().length == 1 ) {
			final Type singleSubType = dependentIdType.getSubtypes()[0];
			if ( singleSubType.isEntityType() ) {
				final EntityType dependentParentType = (EntityType) singleSubType;
				final SessionFactoryImplementor factory = event.getSession().getFactory();
				final Type dependentParentIdType = dependentParentType.getIdentifierOrUniqueKeyType( factory );
				if ( dependentParentIdType.getReturnedClass().isInstance( event.getEntityId() ) ) {
					// yep that's what we have...
					return loadByDerivedIdentitySimplePkValue( event, loadType, persister,
							dependentIdType, factory.getMetamodel().entityPersister( dependentParentType.getAssociatedEntityName() )
					);
				}
			}
		}
	}
	throw new TypeMismatchException(
			"Provided id of the wrong type for class " + persister.getEntityName() + ". Expected: " + idClass + ", got " + event.getEntityId().getClass() );
}
 

@RegistryServiceTest
public void testLabels(Supplier<RegistryService> supplier) throws Exception {
    String artifactId = generateArtifactId();
    RegistryService client = supplier.get();
    try {
        ByteArrayInputStream stream = new ByteArrayInputStream("{\"name\":\"redhat\"}".getBytes(StandardCharsets.UTF_8));
        CompletionStage<ArtifactMetaData> csResult = client.createArtifact(ArtifactType.JSON, artifactId, null, stream);
        ConcurrentUtil.result(csResult);
        
        this.waitForArtifact(artifactId);

        EditableMetaData emd = new EditableMetaData();
        emd.setName("myname");

        final List<String> artifactLabels = Arrays.asList("Open Api", "Awesome Artifact", "JSON");
        emd.setLabels(artifactLabels);
        client.updateArtifactMetaData(artifactId, emd);

        retry(() -> {
            ArtifactMetaData artifactMetaData = client.getArtifactMetaData(artifactId);
            Assertions.assertNotNull(artifactMetaData);
            Assertions.assertEquals("myname", artifactMetaData.getName());
            Assertions.assertEquals(3, artifactMetaData.getLabels().size());
            Assertions.assertTrue(artifactMetaData.getLabels().containsAll(artifactLabels));
        });

        retry((() -> {

            ArtifactSearchResults results = client
                    .searchArtifacts("open api", 0, 2, SearchOver.labels, SortOrder.asc);
            Assertions.assertNotNull(results);
            Assertions.assertEquals(1, results.getCount());
            Assertions.assertEquals(1, results.getArtifacts().size());
            Assertions.assertTrue(results.getArtifacts().get(0).getLabels().containsAll(artifactLabels));
        }));
    } finally {
        client.deleteArtifact(artifactId);
    }
}
 

@Test
public void testInjectHaltEvent() throws Exception {
  Event injectedEvent = Event.halt(WFI);
  ByteString eventPayload = serialize(injectedEvent);
  CompletionStage<Response<ByteString>> post =
      serviceHelper.request("POST", BASE + "/events", eventPayload);

  post.toCompletableFuture().get(1, MINUTES); // block until done

  verify(stateManager).receive(Event.halt(WFI));
}
 

@Override
public CompletionStage<Result> apply(final Function<Http.RequestHeader, CompletionStage<Result>> nextFilter,
                                     final Http.RequestHeader requestHeader) {
    if (httpAuthentication != null && httpAuthentication.isEnabled()) {
        return authenticate(nextFilter, requestHeader, httpAuthentication);
    } else {
        return nextFilter.apply(requestHeader);
    }
}
 

/**
 * Completion of a toCompletableFuture copy of a minimal stage
 * does not complete its source.
 */
public void testMinimalCompletionStage_toCompletableFuture_oneWayPropagation() {
    CompletableFuture<Integer> f = new CompletableFuture<>();
    CompletionStage<Integer> g = f.minimalCompletionStage();
    assertTrue(g.toCompletableFuture().complete(1));
    assertTrue(g.toCompletableFuture().complete(null));
    assertTrue(g.toCompletableFuture().cancel(true));
    assertTrue(g.toCompletableFuture().cancel(false));
    assertTrue(g.toCompletableFuture().completeExceptionally(new CFException()));
    checkIncomplete(g.toCompletableFuture());
    f.complete(1);
    checkCompletedNormally(g.toCompletableFuture(), 1);
}
 

private static <W extends BoundedWindow>
    CompletionStage<StateResponse.Builder> handleClearRequest(
        StateRequest request,
        ByteString key,
        W window,
        BagUserStateHandler<ByteString, ByteString, W> handler) {
  handler.clear(key, window);
  return CompletableFuture.completedFuture(
      StateResponse.newBuilder()
          .setId(request.getId())
          .setClear(StateClearResponse.getDefaultInstance()));
}
 

/**
 * Creates an infinite AsyncIterator starting at {@code start}.
 *
 * @param start the start point of iteration (inclusive)
 * @return an AsyncIterator that will return longs starting with start
 */
static AsyncIterator<Long> infiniteRange(final long start) {
  return new AsyncIterator<Long>() {
    long counter = start;

    @Override
    public CompletionStage<Either<End, Long>> nextStage() {
      return StageSupport.completedStage(Either.right(this.counter++));
    }
  };
}
 

@Override
protected CompletionStage<CartDiscountSyncStatistics> processBatch(@Nonnull final List<CartDiscountDraft> batch) {

    final Set<CartDiscountDraft> validCartDiscountDrafts =
            batch.stream().filter(this::validateDraft).collect(toSet());
    if (validCartDiscountDrafts.isEmpty()) {
        statistics.incrementProcessed(batch.size());
        return completedFuture(statistics);
    }

    final Set<String> keys = validCartDiscountDrafts.stream().map(CartDiscountDraft::getKey).collect(toSet());


    return cartDiscountService
            .fetchMatchingCartDiscountsByKeys(keys)
            .handle(ImmutablePair::new)
            .thenCompose(fetchResponse -> {
                final Set<CartDiscount> fetchedCartDiscounts = fetchResponse.getKey();
                final Throwable exception = fetchResponse.getValue();

                if (exception != null) {
                    final String errorMessage = format(CTP_CART_DISCOUNT_FETCH_FAILED, keys);
                    handleError(errorMessage, exception, keys.size());
                    return CompletableFuture.completedFuture(null);
                } else {
                    return syncBatch(fetchedCartDiscounts, validCartDiscountDrafts);
                }
            })
            .thenApply(ignored -> {
                statistics.incrementProcessed(batch.size());
                return statistics;
            });
}
 

@Override
public CompletionStage<Void> thenAccept(final Consumer<? super T> action) {
  Objects.requireNonNull(action);
  if (this.exception == null) {
    try {
      action.accept(this.result);
    } catch (final Throwable e) {
      return CompletedStage.completionException(e);
    }
    return VOID;
  }
  return typedException();
}
 

@Override
public CompletionStage<T> getCompletionStage() {
  if (publicStage == null) {
    publicStage = new CompletableFuture<>();
  }

  return publicStage;
}
 

@Override
public CompletionStage<?> cascade(
		EventSource session,
		Object child,
		String entityName,
		IdentitySet context,
		boolean isCascadeDeleteEnabled)
		throws HibernateException {
	LOG.tracev( "Cascading to persist: {0}", entityName );
	return session.unwrap(ReactiveSession.class).reactivePersist( child, context );
}