Class JAXRSClient

jaxrs2/src/main/java/feign/jaxrs2/JAXRSClient.java:45–134

This module directs Feign's http requests to javax.ws.rs.client.Client . Ex: GitHub github = Feign.builder().client(new JaxRSClient()).target(GitHub.class, "https://api.github.com");

 * </pre>
 */
public class JAXRSClient implements Client {

  private final ClientBuilder clientBuilder;

  public JAXRSClient() {
    this(ClientBuilder.newBuilder());
  }

  public JAXRSClient(ClientBuilder clientBuilder) {
    this.clientBuilder = clientBuilder;
  }

  @Override
  public feign.Response execute(feign.Request request, Options options) throws IOException {
    final Response response =
        clientBuilder
            .connectTimeout(options.connectTimeoutMillis(), TimeUnit.MILLISECONDS)
            .readTimeout(options.readTimeoutMillis(), TimeUnit.MILLISECONDS)
            .build()
            .target(request.url())
            .request()
            .headers(toMultivaluedMap(request.headers()))
            .method(request.httpMethod().name(), createRequestEntity(request));

    return feign.Response.builder()
        .request(request)
        .body(
            response.readEntity(InputStream.class),
            integerHeader(response, HttpHeaders.CONTENT_LENGTH))
        .headers(toMap(response.getStringHeaders()))
        .status(response.getStatus())
        .reason(response.getStatusInfo().getReasonPhrase())
        .build();
  }

  private Entity<byte[]> createRequestEntity(feign.Request request) {
    if (request.body() == null) {
      return null;
    }

    return Entity.entity(
        request.body(),
        new Variant(
            mediaType(request.headers()), locale(request.headers()), encoding(request.charset())));
  }

  private Integer integerHeader(Response response, String header) {
    final MultivaluedMap<String, String> headers = response.getStringHeaders();
    if (!headers.containsKey(header)) {
      return null;
    }

    try {
      return Integer.valueOf(headers.getFirst(header));
    } catch (final NumberFormatException e) {
      // not a number or too big to fit Integer
      return null;
    }