Collape ServerHttpMessage[Reader|Writer]

This commit folds ServerHttpMessage[Reader|Writer] into its parent
HttpMessage[Reader|Writer] with the server methods pre-implemented
by default to be simple pass-through delegates.
This commit is contained in:
Rossen Stoyanchev
2017-03-24 17:36:28 -04:00
parent 4a7218f54f
commit 5414cd0cf8
26 changed files with 186 additions and 245 deletions

View File

@@ -32,7 +32,7 @@ import org.springframework.core.ReactiveAdapterRegistry;
import org.springframework.core.ResolvableType;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.http.MediaType;
import org.springframework.http.codec.ServerHttpMessageReader;
import org.springframework.http.codec.HttpMessageReader;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.util.Assert;
@@ -48,7 +48,7 @@ import org.springframework.web.server.UnsupportedMediaTypeStatusException;
/**
* Abstract base class for argument resolvers that resolve method arguments
* by reading the request body with an {@link ServerHttpMessageReader}.
* by reading the request body with an {@link HttpMessageReader}.
*
* <p>Applies validation if the method argument is annotated with
* {@code @javax.validation.Valid} or
@@ -60,16 +60,16 @@ import org.springframework.web.server.UnsupportedMediaTypeStatusException;
*/
public abstract class AbstractMessageReaderArgumentResolver extends HandlerMethodArgumentResolverSupport {
private final List<ServerHttpMessageReader<?>> messageReaders;
private final List<HttpMessageReader<?>> messageReaders;
private final List<MediaType> supportedMediaTypes;
/**
* Constructor with {@link ServerHttpMessageReader}'s and a {@link Validator}.
* Constructor with {@link HttpMessageReader}'s and a {@link Validator}.
* @param readers readers to convert from the request body
*/
protected AbstractMessageReaderArgumentResolver(List<ServerHttpMessageReader<?>> readers) {
protected AbstractMessageReaderArgumentResolver(List<HttpMessageReader<?>> readers) {
this(readers, new ReactiveAdapterRegistry());
}
@@ -78,7 +78,7 @@ public abstract class AbstractMessageReaderArgumentResolver extends HandlerMetho
* @param messageReaders readers to convert from the request body
* @param adapterRegistry for adapting to other reactive types from Flux and Mono
*/
protected AbstractMessageReaderArgumentResolver(List<ServerHttpMessageReader<?>> messageReaders,
protected AbstractMessageReaderArgumentResolver(List<HttpMessageReader<?>> messageReaders,
ReactiveAdapterRegistry adapterRegistry) {
super(adapterRegistry);
@@ -94,7 +94,7 @@ public abstract class AbstractMessageReaderArgumentResolver extends HandlerMetho
/**
* Return the configured message converters.
*/
public List<ServerHttpMessageReader<?>> getMessageReaders() {
public List<HttpMessageReader<?>> getMessageReaders() {
return this.messageReaders;
}
@@ -113,7 +113,7 @@ public abstract class AbstractMessageReaderArgumentResolver extends HandlerMetho
mediaType = MediaType.APPLICATION_OCTET_STREAM;
}
for (ServerHttpMessageReader<?> reader : getMessageReaders()) {
for (HttpMessageReader<?> reader : getMessageReaders()) {
if (reader.canRead(elementType, mediaType)) {
Map<String, Object> readHints = Collections.emptyMap();
if (adapter != null && adapter.isMultiValue()) {

View File

@@ -27,7 +27,7 @@ import org.springframework.core.ReactiveAdapter;
import org.springframework.core.ReactiveAdapterRegistry;
import org.springframework.core.ResolvableType;
import org.springframework.http.MediaType;
import org.springframework.http.codec.ServerHttpMessageWriter;
import org.springframework.http.codec.HttpMessageWriter;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.util.Assert;
@@ -38,24 +38,24 @@ import org.springframework.web.server.ServerWebExchange;
/**
* Abstract base class for result handlers that handle return values by writing
* to the response with {@link ServerHttpMessageWriter}.
* to the response with {@link HttpMessageWriter}.
*
* @author Rossen Stoyanchev
* @since 5.0
*/
public abstract class AbstractMessageWriterResultHandler extends HandlerResultHandlerSupport {
private final List<ServerHttpMessageWriter<?>> messageWriters;
private final List<HttpMessageWriter<?>> messageWriters;
/**
* Constructor with {@link ServerHttpMessageWriter}s and a
* Constructor with {@link HttpMessageWriter}s and a
* {@code RequestedContentTypeResolver}.
*
* @param messageWriters for serializing Objects to the response body stream
* @param contentTypeResolver for resolving the requested content type
*/
protected AbstractMessageWriterResultHandler(List<ServerHttpMessageWriter<?>> messageWriters,
protected AbstractMessageWriterResultHandler(List<HttpMessageWriter<?>> messageWriters,
RequestedContentTypeResolver contentTypeResolver) {
super(contentTypeResolver);
@@ -71,7 +71,7 @@ public abstract class AbstractMessageWriterResultHandler extends HandlerResultHa
* @param adapterRegistry for adapting other reactive types (e.g. rx.Observable,
* rx.Single, etc.) to Flux or Mono
*/
protected AbstractMessageWriterResultHandler(List<ServerHttpMessageWriter<?>> messageWriters,
protected AbstractMessageWriterResultHandler(List<HttpMessageWriter<?>> messageWriters,
RequestedContentTypeResolver contentTypeResolver,
ReactiveAdapterRegistry adapterRegistry) {
@@ -84,7 +84,7 @@ public abstract class AbstractMessageWriterResultHandler extends HandlerResultHa
/**
* Return the configured message converters.
*/
public List<ServerHttpMessageWriter<?>> getMessageWriters() {
public List<HttpMessageWriter<?>> getMessageWriters() {
return this.messageWriters;
}
@@ -115,7 +115,7 @@ public abstract class AbstractMessageWriterResultHandler extends HandlerResultHa
ServerHttpResponse response = exchange.getResponse();
MediaType bestMediaType = selectMediaType(exchange, () -> getProducibleMediaTypes(elementType));
if (bestMediaType != null) {
for (ServerHttpMessageWriter<?> writer : getMessageWriters()) {
for (HttpMessageWriter<?> writer : getMessageWriters()) {
if (writer.canWrite(elementType, bestMediaType)) {
return writer.write((Publisher) publisher, bodyType, elementType,
bestMediaType, request, response, Collections.emptyMap());

View File

@@ -24,7 +24,7 @@ import org.springframework.core.MethodParameter;
import org.springframework.core.ReactiveAdapterRegistry;
import org.springframework.http.HttpEntity;
import org.springframework.http.RequestEntity;
import org.springframework.http.codec.ServerHttpMessageReader;
import org.springframework.http.codec.HttpMessageReader;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.web.reactive.BindingContext;
import org.springframework.web.reactive.result.method.HandlerMethodArgumentResolver;
@@ -40,7 +40,7 @@ import org.springframework.web.server.ServerWebExchange;
*/
public class HttpEntityArgumentResolver extends AbstractMessageReaderArgumentResolver {
public HttpEntityArgumentResolver(List<ServerHttpMessageReader<?>> readers,
public HttpEntityArgumentResolver(List<HttpMessageReader<?>> readers,
ReactiveAdapterRegistry registry) {
super(readers, registry);

View File

@@ -22,7 +22,7 @@ import reactor.core.publisher.Mono;
import org.springframework.core.MethodParameter;
import org.springframework.core.ReactiveAdapterRegistry;
import org.springframework.http.codec.ServerHttpMessageReader;
import org.springframework.http.codec.HttpMessageReader;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.reactive.BindingContext;
import org.springframework.web.reactive.result.method.HandlerMethodArgumentResolver;
@@ -45,7 +45,7 @@ import org.springframework.web.server.ServerWebInputException;
*/
public class RequestBodyArgumentResolver extends AbstractMessageReaderArgumentResolver {
public RequestBodyArgumentResolver(List<ServerHttpMessageReader<?>> readers,
public RequestBodyArgumentResolver(List<HttpMessageReader<?>> readers,
ReactiveAdapterRegistry registry) {
super(readers, registry);

View File

@@ -46,7 +46,7 @@ import org.springframework.core.codec.ResourceDecoder;
import org.springframework.core.codec.StringDecoder;
import org.springframework.http.codec.DecoderHttpMessageReader;
import org.springframework.http.codec.ServerCodecConfigurer;
import org.springframework.http.codec.ServerHttpMessageReader;
import org.springframework.http.codec.HttpMessageReader;
import org.springframework.util.Assert;
import org.springframework.util.ReflectionUtils;
import org.springframework.web.bind.annotation.InitBinder;
@@ -78,7 +78,7 @@ public class RequestMappingHandlerAdapter implements HandlerAdapter, Application
private static final Log logger = LogFactory.getLog(RequestMappingHandlerAdapter.class);
private final List<ServerHttpMessageReader<?>> messageReaders = new ArrayList<>(10);
private final List<HttpMessageReader<?>> messageReaders = new ArrayList<>(10);
private WebBindingInitializer webBindingInitializer;
@@ -131,7 +131,7 @@ public class RequestMappingHandlerAdapter implements HandlerAdapter, Application
* including JSON encoding .
* @see ServerCodecConfigurer
*/
public void setMessageReaders(List<ServerHttpMessageReader<?>> messageReaders) {
public void setMessageReaders(List<HttpMessageReader<?>> messageReaders) {
this.messageReaders.clear();
this.messageReaders.addAll(messageReaders);
}
@@ -139,7 +139,7 @@ public class RequestMappingHandlerAdapter implements HandlerAdapter, Application
/**
* Return the configured HTTP message readers.
*/
public List<ServerHttpMessageReader<?>> getMessageReaders() {
public List<HttpMessageReader<?>> getMessageReaders() {
return this.messageReaders;
}

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@@ -23,7 +23,7 @@ import reactor.core.publisher.Mono;
import org.springframework.core.MethodParameter;
import org.springframework.core.ReactiveAdapterRegistry;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.http.codec.ServerHttpMessageWriter;
import org.springframework.http.codec.HttpMessageWriter;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.reactive.HandlerResult;
import org.springframework.web.reactive.HandlerResultHandler;
@@ -34,7 +34,7 @@ import org.springframework.web.server.ServerWebExchange;
/**
* {@code HandlerResultHandler} that handles return values from methods annotated
* with {@code @ResponseBody} writing to the body of the request or response with
* an {@link ServerHttpMessageWriter}.
* an {@link HttpMessageWriter}.
*
* <p>By default the order for this result handler is set to 100. As it detects
* the presence of {@code @ResponseBody} it should be ordered after result
@@ -56,7 +56,7 @@ public class ResponseBodyResultHandler extends AbstractMessageWriterResultHandle
* @param writers writers for serializing to the response body
* @param resolver to determine the requested content type
*/
public ResponseBodyResultHandler(List<ServerHttpMessageWriter<?>> writers,
public ResponseBodyResultHandler(List<HttpMessageWriter<?>> writers,
RequestedContentTypeResolver resolver) {
this(writers, resolver, new ReactiveAdapterRegistry());
@@ -68,7 +68,7 @@ public class ResponseBodyResultHandler extends AbstractMessageWriterResultHandle
* @param resolver to determine the requested content type
* @param registry for adaptation to reactive types
*/
public ResponseBodyResultHandler(List<ServerHttpMessageWriter<?>> writers,
public ResponseBodyResultHandler(List<HttpMessageWriter<?>> writers,
RequestedContentTypeResolver resolver, ReactiveAdapterRegistry registry) {
super(writers, resolver, registry);

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@@ -30,7 +30,7 @@ import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.RequestEntity;
import org.springframework.http.ResponseEntity;
import org.springframework.http.codec.ServerHttpMessageWriter;
import org.springframework.http.codec.HttpMessageWriter;
import org.springframework.util.Assert;
import org.springframework.web.reactive.HandlerResult;
import org.springframework.web.reactive.HandlerResultHandler;
@@ -57,7 +57,7 @@ public class ResponseEntityResultHandler extends AbstractMessageWriterResultHand
* @param writers writers for serializing to the response body
* @param resolver to determine the requested content type
*/
public ResponseEntityResultHandler(List<ServerHttpMessageWriter<?>> writers,
public ResponseEntityResultHandler(List<HttpMessageWriter<?>> writers,
RequestedContentTypeResolver resolver) {
this(writers, resolver, new ReactiveAdapterRegistry());
@@ -69,7 +69,7 @@ public class ResponseEntityResultHandler extends AbstractMessageWriterResultHand
* @param resolver to determine the requested content type
* @param registry for adaptation to reactive types
*/
public ResponseEntityResultHandler(List<ServerHttpMessageWriter<?>> writers,
public ResponseEntityResultHandler(List<HttpMessageWriter<?>> writers,
RequestedContentTypeResolver resolver, ReactiveAdapterRegistry registry) {
super(writers, resolver, registry);

View File

@@ -30,7 +30,7 @@ import org.mockito.MockitoAnnotations;
import org.springframework.context.support.StaticApplicationContext;
import org.springframework.core.convert.ConversionService;
import org.springframework.format.FormatterRegistry;
import org.springframework.http.codec.ServerHttpMessageWriter;
import org.springframework.http.codec.HttpMessageWriter;
import org.springframework.http.codec.ServerCodecConfigurer;
import org.springframework.validation.beanvalidation.LocalValidatorFactoryBean;
import org.springframework.web.bind.support.ConfigurableWebBindingInitializer;
@@ -61,7 +61,7 @@ public class DelegatingWebFluxConfigurationTests {
private ArgumentCaptor<ServerCodecConfigurer> codecsConfigurer;
@Captor
private ArgumentCaptor<List<ServerHttpMessageWriter<?>>> writers;
private ArgumentCaptor<List<HttpMessageWriter<?>>> writers;
@Captor
private ArgumentCaptor<FormatterRegistry> formatterRegistry;

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@@ -34,8 +34,8 @@ import org.springframework.core.codec.StringDecoder;
import org.springframework.core.convert.ConversionService;
import org.springframework.core.io.Resource;
import org.springframework.http.MediaType;
import org.springframework.http.codec.ServerHttpMessageReader;
import org.springframework.http.codec.ServerHttpMessageWriter;
import org.springframework.http.codec.HttpMessageReader;
import org.springframework.http.codec.HttpMessageWriter;
import org.springframework.http.codec.ServerCodecConfigurer;
import org.springframework.http.codec.json.Jackson2JsonEncoder;
import org.springframework.http.codec.xml.Jaxb2XmlDecoder;
@@ -126,7 +126,7 @@ public class WebFluxConfigurationSupportTests {
RequestMappingHandlerAdapter adapter = context.getBean(name, RequestMappingHandlerAdapter.class);
assertNotNull(adapter);
List<ServerHttpMessageReader<?>> readers = adapter.getMessageReaders();
List<HttpMessageReader<?>> readers = adapter.getMessageReaders();
assertEquals(8, readers.size());
assertHasMessageReader(readers, byte[].class, APPLICATION_OCTET_STREAM);
@@ -159,7 +159,7 @@ public class WebFluxConfigurationSupportTests {
RequestMappingHandlerAdapter adapter = context.getBean(name, RequestMappingHandlerAdapter.class);
assertNotNull(adapter);
List<ServerHttpMessageReader<?>> messageReaders = adapter.getMessageReaders();
List<HttpMessageReader<?>> messageReaders = adapter.getMessageReaders();
assertEquals(2, messageReaders.size());
assertHasMessageReader(messageReaders, String.class, TEXT_PLAIN);
@@ -176,7 +176,7 @@ public class WebFluxConfigurationSupportTests {
assertEquals(0, handler.getOrder());
List<ServerHttpMessageWriter<?>> writers = handler.getMessageWriters();
List<HttpMessageWriter<?>> writers = handler.getMessageWriters();
assertEquals(9, writers.size());
assertHasMessageWriter(writers, byte[].class, APPLICATION_OCTET_STREAM);
@@ -202,7 +202,7 @@ public class WebFluxConfigurationSupportTests {
assertEquals(100, handler.getOrder());
List<ServerHttpMessageWriter<?>> writers = handler.getMessageWriters();
List<HttpMessageWriter<?>> writers = handler.getMessageWriters();
assertEquals(9, writers.size());
assertHasMessageWriter(writers, byte[].class, APPLICATION_OCTET_STREAM);
@@ -258,12 +258,12 @@ public class WebFluxConfigurationSupportTests {
}
private void assertHasMessageReader(List<ServerHttpMessageReader<?>> readers, Class<?> clazz, MediaType mediaType) {
private void assertHasMessageReader(List<HttpMessageReader<?>> readers, Class<?> clazz, MediaType mediaType) {
ResolvableType type = ResolvableType.forClass(clazz);
assertTrue(readers.stream().anyMatch(c -> mediaType == null || c.canRead(type, mediaType)));
}
private void assertHasMessageWriter(List<ServerHttpMessageWriter<?>> writers, Class<?> clazz, MediaType mediaType) {
private void assertHasMessageWriter(List<HttpMessageWriter<?>> writers, Class<?> clazz, MediaType mediaType) {
ResolvableType type = ResolvableType.forClass(clazz);
assertTrue(writers.stream().anyMatch(c -> mediaType == null || c.canWrite(type, mediaType)));
}

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@@ -39,7 +39,7 @@ import org.springframework.core.codec.StringDecoder;
import org.springframework.http.HttpEntity;
import org.springframework.http.RequestEntity;
import org.springframework.http.codec.DecoderHttpMessageReader;
import org.springframework.http.codec.ServerHttpMessageReader;
import org.springframework.http.codec.HttpMessageReader;
import org.springframework.mock.http.server.reactive.test.MockServerWebExchange;
import org.springframework.util.ObjectUtils;
import org.springframework.web.method.ResolvableMethod;
@@ -73,7 +73,7 @@ public class HttpEntityArgumentResolverTests {
private HttpEntityArgumentResolver createResolver() {
List<ServerHttpMessageReader<?>> readers = new ArrayList<>();
List<HttpMessageReader<?>> readers = new ArrayList<>();
readers.add(new DecoderHttpMessageReader<>(StringDecoder.allMimeTypes(true)));
return new HttpEntityArgumentResolver(readers, new ReactiveAdapterRegistry());
}

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@@ -43,7 +43,7 @@ import org.springframework.core.ResolvableType;
import org.springframework.core.codec.Decoder;
import org.springframework.http.MediaType;
import org.springframework.http.codec.DecoderHttpMessageReader;
import org.springframework.http.codec.ServerHttpMessageReader;
import org.springframework.http.codec.HttpMessageReader;
import org.springframework.http.codec.json.Jackson2JsonDecoder;
import org.springframework.validation.Errors;
import org.springframework.validation.Validator;
@@ -302,7 +302,7 @@ public class MessageReaderArgumentResolverTests {
@SuppressWarnings("Convert2MethodRef")
private AbstractMessageReaderArgumentResolver resolver(Decoder<?>... decoders) {
List<ServerHttpMessageReader<?>> readers = new ArrayList<>();
List<HttpMessageReader<?>> readers = new ArrayList<>();
Arrays.asList(decoders).forEach(decoder -> readers.add(new DecoderHttpMessageReader<>(decoder)));
return new AbstractMessageReaderArgumentResolver(readers) {
@Override

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@@ -43,7 +43,7 @@ import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.http.codec.EncoderHttpMessageWriter;
import org.springframework.http.codec.ResourceHttpMessageWriter;
import org.springframework.http.codec.ServerHttpMessageWriter;
import org.springframework.http.codec.HttpMessageWriter;
import org.springframework.http.codec.json.Jackson2JsonEncoder;
import org.springframework.http.codec.xml.Jaxb2XmlEncoder;
import org.springframework.mock.http.server.reactive.test.MockServerHttpRequest;
@@ -71,8 +71,8 @@ public class MessageWriterResultHandlerTests {
private final MockServerWebExchange exchange = MockServerHttpRequest.get("/path").toExchange();
private AbstractMessageWriterResultHandler initResultHandler(ServerHttpMessageWriter<?>... writers) {
List<ServerHttpMessageWriter<?>> writerList;
private AbstractMessageWriterResultHandler initResultHandler(HttpMessageWriter<?>... writers) {
List<HttpMessageWriter<?>> writerList;
if (ObjectUtils.isEmpty(writers)) {
writerList = new ArrayList<>();
writerList.add(new EncoderHttpMessageWriter<>(new ByteBufferEncoder()));
@@ -141,7 +141,7 @@ public class MessageWriterResultHandlerTests {
ByteArrayOutputStream body = new ByteArrayOutputStream();
MethodParameter type = on(TestController.class).resolveReturnType(OutputStream.class);
ServerHttpMessageWriter<?> writer = new EncoderHttpMessageWriter<>(new ByteBufferEncoder());
HttpMessageWriter<?> writer = new EncoderHttpMessageWriter<>(new ByteBufferEncoder());
Mono<Void> mono = initResultHandler(writer).writeBody(body, type, this.exchange);
StepVerifier.create(mono).expectError(IllegalStateException.class).verify();

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@@ -35,7 +35,7 @@ import org.springframework.core.MethodParameter;
import org.springframework.core.ReactiveAdapterRegistry;
import org.springframework.core.codec.StringDecoder;
import org.springframework.http.codec.DecoderHttpMessageReader;
import org.springframework.http.codec.ServerHttpMessageReader;
import org.springframework.http.codec.HttpMessageReader;
import org.springframework.mock.http.server.reactive.test.MockServerHttpRequest;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.method.ResolvableMethod;
@@ -66,7 +66,7 @@ public class RequestBodyArgumentResolverTests {
@Before
public void setup() {
List<ServerHttpMessageReader<?>> readers = new ArrayList<>();
List<HttpMessageReader<?>> readers = new ArrayList<>();
readers.add(new DecoderHttpMessageReader<>(StringDecoder.allMimeTypes(true)));
this.resolver = new RequestBodyArgumentResolver(readers, new ReactiveAdapterRegistry());
}

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@@ -30,7 +30,7 @@ import org.springframework.core.codec.ByteBufferEncoder;
import org.springframework.core.codec.CharSequenceEncoder;
import org.springframework.http.codec.EncoderHttpMessageWriter;
import org.springframework.http.codec.ResourceHttpMessageWriter;
import org.springframework.http.codec.ServerHttpMessageWriter;
import org.springframework.http.codec.HttpMessageWriter;
import org.springframework.http.codec.json.Jackson2JsonEncoder;
import org.springframework.http.codec.xml.Jaxb2XmlEncoder;
import org.springframework.stereotype.Controller;
@@ -64,7 +64,7 @@ public class ResponseBodyResultHandlerTests {
@Before
public void setup() throws Exception {
List<ServerHttpMessageWriter<?>> writerList = new ArrayList<>(5);
List<HttpMessageWriter<?>> writerList = new ArrayList<>(5);
writerList.add(new EncoderHttpMessageWriter<>(new ByteBufferEncoder()));
writerList.add(new EncoderHttpMessageWriter<>(CharSequenceEncoder.allMimeTypes()));
writerList.add(new ResourceHttpMessageWriter());

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@@ -44,7 +44,7 @@ import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.http.codec.EncoderHttpMessageWriter;
import org.springframework.http.codec.ResourceHttpMessageWriter;
import org.springframework.http.codec.ServerHttpMessageWriter;
import org.springframework.http.codec.HttpMessageWriter;
import org.springframework.http.codec.json.Jackson2JsonEncoder;
import org.springframework.http.codec.xml.Jaxb2XmlEncoder;
import org.springframework.mock.http.server.reactive.test.MockServerWebExchange;
@@ -83,8 +83,8 @@ public class ResponseEntityResultHandlerTests {
this.resultHandler = createHandler();
}
private ResponseEntityResultHandler createHandler(ServerHttpMessageWriter<?>... writers) {
List<ServerHttpMessageWriter<?>> writerList;
private ResponseEntityResultHandler createHandler(HttpMessageWriter<?>... writers) {
List<HttpMessageWriter<?>> writerList;
if (ObjectUtils.isEmpty(writers)) {
writerList = new ArrayList<>();
writerList.add(new EncoderHttpMessageWriter<>(new ByteBufferEncoder()));