Binding Using CompletableFuture

The same method as the previous example can also be written with the CompletableFuture API instead:

Using CompletableFuture to Read the JSON

@Controller("/people")
public class PersonController {
    Map<String, Person> inMemoryDatastore = new ConcurrentHashMap<>();
    @Post("/saveFuture")
    public CompletableFuture<HttpResponse<Person>> save(@Body CompletableFuture<Person> person) {
        return person.thenApply(p -> {
                    inMemoryDatastore.put(p.getFirstName(), p);
                    return HttpResponse.created(p);
                }
        );
    }
}

Using CompletableFuture to Read the JSON

@Controller("/people")
class PersonController {
    ConcurrentHashMap<String, Person> inMemoryDatastore = [:]
    @Post("/saveFuture")
    CompletableFuture<HttpResponse<Person>> save(@Body CompletableFuture<Person> person) {
        person.thenApply({ p ->
            inMemoryDatastore.put(p.getFirstName(), p)
            HttpResponse.created(p)
        })
    }
}

Using CompletableFuture to Read the JSON

@Controller("/people")
class PersonController {
    internal var inMemoryDatastore: MutableMap<String, Person> = ConcurrentHashMap()
    @Post("/saveFuture")
    fun save(@Body person: CompletableFuture<Person>): CompletableFuture<HttpResponse<Person>> {
        return person.thenApply { p ->
            inMemoryDatastore[p.firstName] = p
            HttpResponse.created(p)
        }
    }
}

The above example uses the thenApply method to achieve the same as the previous example.