WebClient + PagedResources Support

[rwinch]

Right now it does not appear that there is WebClient and PagedResources support. I'd like Hateoas to provide the proper integration and Boot (create a separate ticket if necessary) to integrate this into the default WebClient.Builder.

If I try and retrieve PagedResources the content is empty even if there is content.

ParameterizedTypeReference<PagedResources<Message>> type =
		new ParameterizedTypeReference<PagedResources<Message>>() {};
PagedResources<Message> response = this.client.get()
		.uri(this.url)
		.retrieve()
		.bodyToMono(type)
		.block();
// fails even when content is present
assertThat(response.getContent()).hasSize(1);

Here is the body

{
  "_embedded" : {
    "messages" : [ {
      "text" : "Hi",
      "_links" : {
        "self" : {
          "href" : "http://localhost:42101/messages/1"
        },
        "message" : {
          "href" : "http://localhost:42101/messages/1"
        }
      }
    } ]
  },
  "_links" : {
    "self" : {
      "href" : "http://localhost:42101/messages{?page,size,sort}",
      "templated" : true
    },
    "profile" : {
      "href" : "http://localhost:42101/profile/messages"
    }
  },
  "page" : {
    "size" : 20,
    "totalElements" : 1,
    "totalPages" : 1,
    "number" : 0
  }
}

Here is Message

@Entity
public class Message {
	@Id
	@GeneratedValue
	private Long id;

	private String text;

	public Message() {
	}

	public Message(String text) {
		this.text = text;
	}

	public Long getId() {
		return this.id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public String getText() {
		return this.text;
	}

	public void setText(String text) {
		this.text = text;
	}
}

Finally MessageRepository

@RepositoryRestResource
public interface MessageRepository extends PagingAndSortingRepository<Message, Long> {
}

Here is a complete sample to demonstrate the issue https://github.com/rwinch/spring-hateoas-webclient/blob/master/src/test/java/sample/springhateoaswebclient/SpringHateoasWebclientApplicationTests.java#L56

[gregturn]

@rwinch If you have any guidance on how to interrogate a WebClient to discern what message I would appreciate it.

I starting drafting

@Test
public void registersHttpMessageConvertersForWebClient() {

	withContext(WebClientHalConfig.class, context -> {

		WebClient client = context.getBean(WebClient.class)
			.mutate()
			.exchangeStrategies(ExchangeStrategies.withDefaults())
			.build();

		assertThat(1).isEqualTo(1);
	});
}

@Configuration
@EnableHypermediaSupport(type = HypermediaType.HAL)
@EnableWebMvc
static class WebClientHalConfig {

	@Bean
	public WebClient webClient() {
		return WebClient.create();
	}
}

But..there is little to assert against due to the highly encapsulated nature of WebClient. I can see a bunch of info in my debugger but that's it.

[rwinch]

Sorry...I'm not sure I understand what you are asking? Can you rephrase your question please?

[gregturn]

The client instance in the test case above has little to assert against. I don't see how to inspect if it has a particular encoder registered or not. At least, not without reflection.

An alternative would be to point at some mock server and see if it deserializes a document correctly. But I was hoping to not go there for a unit test.

[rwinch]

Unfortunately I don't have any alternatives for you. Spring Framework typically points to a MockWebServer instance for their tests. This is also what I do for my tests.

[gregturn]

Follow the progress of #728.

[gregturn]

Resolved via #728.