Context Propagation in Quarkus

<!-- Quarkus REST extension if not already included -->
<dependency>
    <groupId>io.quarkus</groupId>
    <artifactId>quarkus-rest</artifactId>
</dependency>
<!-- Context Propagation extension -->
<dependency>
    <groupId>io.quarkus</groupId>
    <artifactId>quarkus-smallrye-context-propagation</artifactId>
</dependency>

// Quarkus REST extension if not already included
implementation("io.quarkus:quarkus-rest")
// Context Propagation extension
implementation("io.quarkus:quarkus-smallrye-context-propagation")

    // Get the prices stream
    @Inject
    @Channel("prices") Publisher<Double> prices;

    @Transactional
    @GET
    @Path("/prices")
    @RestStreamElementType(MediaType.TEXT_PLAIN)
    public Publisher<Double> prices() {
        // get the next three prices from the price stream
        return Multi.createFrom().publisher(prices)
                .select().first(3)
                // The items are received from the event loop, so cannot use Hibernate ORM (classic)
                // Switch to a worker thread, the transaction will be propagated
                .emitOn(Infrastructure.getDefaultExecutor())
                .map(price -> {
                    // store each price before we send them
                    Price priceEntity = new Price();
                    priceEntity.value = price;
                    // here we are all in the same transaction
                    // thanks to context propagation
                    priceEntity.persist();
                    return price;
                    // the transaction is committed once the stream completes
                });
    }

    @Inject ThreadContext threadContext;
    @Inject ManagedExecutor managedExecutor;
    @Inject Vertx vertx;

    @Transactional
    @GET
    @Path("/people")
    public CompletionStage<List<Person>> people() throws SystemException {
        // Create a REST client to the Star Wars API
        WebClient client = WebClient.create(vertx,
                         new WebClientOptions()
                          .setDefaultHost("swapi.dev")
                          .setDefaultPort(443)
                          .setSsl(true));
        // get the list of Star Wars people, with context capture
        return threadContext.withContextCapture(client.get("/api/people/").send())
                .thenApplyAsync(response -> {
                    JsonObject json = response.bodyAsJsonObject();
                    List<Person> persons = new ArrayList<>(json.getInteger("count"));
                    // Store them in the DB
                    // Note that we're still in the same transaction as the outer method
                    for (Object element : json.getJsonArray("results")) {
                        Person person = new Person();
                        person.name = ((JsonObject) element).getString("name");
                        person.persist();
                        persons.add(person);
                    }
                    return persons;
                }, managedExecutor);
    }