Java Code Examples for reactor.core.publisher.Mono#switchIfEmpty()
The following examples show how to use
reactor.core.publisher.Mono#switchIfEmpty() .
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Example 1
| Source File: ChainingStrategy.java From Moss with Apache License 2.0 | 6 votes |
|
@Override
public Mono<Endpoints> detectEndpoints(Instance instance) {
Mono<Endpoints> result = Mono.empty();
for (EndpointDetectionStrategy delegate : delegates) {
result = result.switchIfEmpty(delegate.detectEndpoints(instance));
}
return result.switchIfEmpty(Mono.just(Endpoints.empty()));
}
Example 2
| Source File: RestTemplateFakeReactiveHttpClient.java From feign-reactive with Apache License 2.0 | 5 votes |
|
@Override
public Mono<ReactiveHttpResponse> executeRequest(ReactiveHttpRequest request) {
Mono<Object> bodyMono;
if (request.body() instanceof Mono) {
bodyMono = ((Mono<Object>) request.body());
} else if (request.body() instanceof Flux) {
bodyMono = ((Flux) request.body()).collectList();
} else {
bodyMono = Mono.just(request.body());
}
bodyMono = bodyMono.switchIfEmpty(Mono.just(new byte[0]));
return bodyMono.<ReactiveHttpResponse>flatMap(body -> {
MultiValueMap<String, String> headers = new LinkedMultiValueMap<>(request.headers());
if (acceptGzip) {
headers.add("Accept-Encoding", "gzip");
}
ResponseEntity response =
restTemplate.exchange(request.uri().toString(), HttpMethod.valueOf(request.method()),
new HttpEntity<>(body, headers), responseType());
return Mono.just(new FakeReactiveHttpResponse(response, returnPublisherType));
})
.onErrorMap(ex -> ex instanceof ResourceAccessException
&& ex.getCause() instanceof SocketTimeoutException,
ReadTimeoutException::new)
.onErrorResume(HttpStatusCodeException.class,
ex -> Mono.just(new ErrorReactiveHttpResponse(ex)));
}
Example 3
| Source File: RestTemplateFakeReactiveHttpClient.java From feign-reactive with Apache License 2.0 | 5 votes |
|
@Override
public Mono<ReactiveHttpResponse> executeRequest(ReactiveHttpRequest request) {
Mono<Object> bodyMono;
if (request.body() instanceof Mono) {
bodyMono = ((Mono<Object>) request.body());
} else if (request.body() instanceof Flux) {
bodyMono = ((Flux) request.body()).collectList();
} else {
bodyMono = Mono.just(request.body());
}
bodyMono = bodyMono.switchIfEmpty(Mono.just(new byte[0]));
return bodyMono.<ReactiveHttpResponse>flatMap(body -> {
MultiValueMap<String, String> headers = new LinkedMultiValueMap<>(request.headers());
if (acceptGzip) {
headers.add("Accept-Encoding", "gzip");
}
ResponseEntity response =
restTemplate.exchange(request.uri().toString(), HttpMethod.valueOf(request.method()),
new HttpEntity<>(body, headers), responseType());
return Mono.just(new FakeReactiveHttpResponse(response, returnPublisherType));
})
.onErrorMap(ex -> ex instanceof ResourceAccessException
&& ex.getCause() instanceof SocketTimeoutException,
ReadTimeoutException::new)
.onErrorResume(HttpStatusCodeException.class,
ex -> Mono.just(new ErrorReactiveHttpResponse(ex)));
}
Example 4
| Source File: ChainingStrategy.java From spring-boot-admin with Apache License 2.0 | 5 votes |
|
@Override
public Mono<Endpoints> detectEndpoints(Instance instance) {
Mono<Endpoints> result = Mono.empty();
for (EndpointDetectionStrategy delegate : delegates) {
result = result.switchIfEmpty(delegate.detectEndpoints(instance));
}
return result.switchIfEmpty(Mono.just(Endpoints.empty()));
}
Example 5
| Source File: PayloadMethodArgumentResolver.java From spring-analysis-note with MIT License | 4 votes |
|
private Mono<Object> decodeContent(MethodParameter parameter, Message<?> message,
boolean isContentRequired, Flux<DataBuffer> content, MimeType mimeType) {
ResolvableType targetType = ResolvableType.forMethodParameter(parameter);
Class<?> resolvedType = targetType.resolve();
ReactiveAdapter adapter = (resolvedType != null ? getAdapterRegistry().getAdapter(resolvedType) : null);
ResolvableType elementType = (adapter != null ? targetType.getGeneric() : targetType);
isContentRequired = isContentRequired || (adapter != null && !adapter.supportsEmpty());
Consumer<Object> validator = getValidator(message, parameter);
Map<String, Object> hints = Collections.emptyMap();
for (Decoder<?> decoder : this.decoders) {
if (decoder.canDecode(elementType, mimeType)) {
if (adapter != null && adapter.isMultiValue()) {
Flux<?> flux = content
.map(buffer -> decoder.decode(buffer, elementType, mimeType, hints))
.onErrorResume(ex -> Flux.error(handleReadError(parameter, message, ex)));
if (isContentRequired) {
flux = flux.switchIfEmpty(Flux.error(() -> handleMissingBody(parameter, message)));
}
if (validator != null) {
flux = flux.doOnNext(validator);
}
return Mono.just(adapter.fromPublisher(flux));
}
else {
// Single-value (with or without reactive type wrapper)
Mono<?> mono = content.next()
.map(buffer -> decoder.decode(buffer, elementType, mimeType, hints))
.onErrorResume(ex -> Mono.error(handleReadError(parameter, message, ex)));
if (isContentRequired) {
mono = mono.switchIfEmpty(Mono.error(() -> handleMissingBody(parameter, message)));
}
if (validator != null) {
mono = mono.doOnNext(validator);
}
return (adapter != null ? Mono.just(adapter.fromPublisher(mono)) : Mono.from(mono));
}
}
}
return Mono.error(new MethodArgumentResolutionException(
message, parameter, "Cannot decode to [" + targetType + "]" + message));
}
Example 6
| Source File: AbstractMessageReaderArgumentResolver.java From spring-analysis-note with MIT License | 4 votes |
|
/**
* Read the body from a method argument with {@link HttpMessageReader}.
* @param bodyParam represents the element type for the body
* @param actualParam the actual method argument type; possibly different
* from {@code bodyParam}, e.g. for an {@code HttpEntity} argument
* @param isBodyRequired true if the body is required
* @param bindingContext the binding context to use
* @param exchange the current exchange
* @return a Mono with the value to use for the method argument
* @since 5.0.2
*/
protected Mono<Object> readBody(MethodParameter bodyParam, @Nullable MethodParameter actualParam,
boolean isBodyRequired, BindingContext bindingContext, ServerWebExchange exchange) {
ResolvableType bodyType = ResolvableType.forMethodParameter(bodyParam);
ResolvableType actualType = (actualParam != null ? ResolvableType.forMethodParameter(actualParam) : bodyType);
Class<?> resolvedType = bodyType.resolve();
ReactiveAdapter adapter = (resolvedType != null ? getAdapterRegistry().getAdapter(resolvedType) : null);
ResolvableType elementType = (adapter != null ? bodyType.getGeneric() : bodyType);
isBodyRequired = isBodyRequired || (adapter != null && !adapter.supportsEmpty());
ServerHttpRequest request = exchange.getRequest();
ServerHttpResponse response = exchange.getResponse();
MediaType contentType = request.getHeaders().getContentType();
MediaType mediaType = (contentType != null ? contentType : MediaType.APPLICATION_OCTET_STREAM);
Object[] hints = extractValidationHints(bodyParam);
if (mediaType.isCompatibleWith(MediaType.APPLICATION_FORM_URLENCODED)) {
return Mono.error(new IllegalStateException(
"In a WebFlux application, form data is accessed via ServerWebExchange.getFormData()."));
}
if (logger.isDebugEnabled()) {
logger.debug(exchange.getLogPrefix() + (contentType != null ?
"Content-Type:" + contentType :
"No Content-Type, using " + MediaType.APPLICATION_OCTET_STREAM));
}
for (HttpMessageReader<?> reader : getMessageReaders()) {
if (reader.canRead(elementType, mediaType)) {
Map<String, Object> readHints = Hints.from(Hints.LOG_PREFIX_HINT, exchange.getLogPrefix());
if (adapter != null && adapter.isMultiValue()) {
if (logger.isDebugEnabled()) {
logger.debug(exchange.getLogPrefix() + "0..N [" + elementType + "]");
}
Flux<?> flux = reader.read(actualType, elementType, request, response, readHints);
flux = flux.onErrorResume(ex -> Flux.error(handleReadError(bodyParam, ex)));
if (isBodyRequired) {
flux = flux.switchIfEmpty(Flux.error(() -> handleMissingBody(bodyParam)));
}
if (hints != null) {
flux = flux.doOnNext(target ->
validate(target, hints, bodyParam, bindingContext, exchange));
}
return Mono.just(adapter.fromPublisher(flux));
}
else {
// Single-value (with or without reactive type wrapper)
if (logger.isDebugEnabled()) {
logger.debug(exchange.getLogPrefix() + "0..1 [" + elementType + "]");
}
Mono<?> mono = reader.readMono(actualType, elementType, request, response, readHints);
mono = mono.onErrorResume(ex -> Mono.error(handleReadError(bodyParam, ex)));
if (isBodyRequired) {
mono = mono.switchIfEmpty(Mono.error(() -> handleMissingBody(bodyParam)));
}
if (hints != null) {
mono = mono.doOnNext(target ->
validate(target, hints, bodyParam, bindingContext, exchange));
}
return (adapter != null ? Mono.just(adapter.fromPublisher(mono)) : Mono.from(mono));
}
}
}
// No compatible reader but body may be empty..
HttpMethod method = request.getMethod();
if (contentType == null && method != null && SUPPORTED_METHODS.contains(method)) {
Flux<DataBuffer> body = request.getBody().doOnNext(buffer -> {
DataBufferUtils.release(buffer);
// Body not empty, back to 415..
throw new UnsupportedMediaTypeStatusException(mediaType, this.supportedMediaTypes, elementType);
});
if (isBodyRequired) {
body = body.switchIfEmpty(Mono.error(() -> handleMissingBody(bodyParam)));
}
return (adapter != null ? Mono.just(adapter.fromPublisher(body)) : Mono.from(body));
}
return Mono.error(new UnsupportedMediaTypeStatusException(mediaType, this.supportedMediaTypes, elementType));
}
Example 7
| Source File: AbstractMessageReaderArgumentResolver.java From java-technology-stack with MIT License | 4 votes |
|
/**
* Read the body from a method argument with {@link HttpMessageReader}.
* @param bodyParam represents the element type for the body
* @param actualParam the actual method argument type; possibly different
* from {@code bodyParam}, e.g. for an {@code HttpEntity} argument
* @param isBodyRequired true if the body is required
* @param bindingContext the binding context to use
* @param exchange the current exchange
* @return a Mono with the value to use for the method argument
* @since 5.0.2
*/
protected Mono<Object> readBody(MethodParameter bodyParam, @Nullable MethodParameter actualParam,
boolean isBodyRequired, BindingContext bindingContext, ServerWebExchange exchange) {
ResolvableType bodyType = ResolvableType.forMethodParameter(bodyParam);
ResolvableType actualType = (actualParam != null ? ResolvableType.forMethodParameter(actualParam) : bodyType);
Class<?> resolvedType = bodyType.resolve();
ReactiveAdapter adapter = (resolvedType != null ? getAdapterRegistry().getAdapter(resolvedType) : null);
ResolvableType elementType = (adapter != null ? bodyType.getGeneric() : bodyType);
isBodyRequired = isBodyRequired || (adapter != null && !adapter.supportsEmpty());
ServerHttpRequest request = exchange.getRequest();
ServerHttpResponse response = exchange.getResponse();
MediaType contentType = request.getHeaders().getContentType();
MediaType mediaType = (contentType != null ? contentType : MediaType.APPLICATION_OCTET_STREAM);
Object[] hints = extractValidationHints(bodyParam);
if (logger.isDebugEnabled()) {
logger.debug(exchange.getLogPrefix() + (contentType != null ?
"Content-Type:" + contentType :
"No Content-Type, using " + MediaType.APPLICATION_OCTET_STREAM));
}
for (HttpMessageReader<?> reader : getMessageReaders()) {
if (reader.canRead(elementType, mediaType)) {
Map<String, Object> readHints = Hints.from(Hints.LOG_PREFIX_HINT, exchange.getLogPrefix());
if (adapter != null && adapter.isMultiValue()) {
if (logger.isDebugEnabled()) {
logger.debug(exchange.getLogPrefix() + "0..N [" + elementType + "]");
}
Flux<?> flux = reader.read(actualType, elementType, request, response, readHints);
flux = flux.onErrorResume(ex -> Flux.error(handleReadError(bodyParam, ex)));
if (isBodyRequired) {
flux = flux.switchIfEmpty(Flux.error(() -> handleMissingBody(bodyParam)));
}
if (hints != null) {
flux = flux.doOnNext(target ->
validate(target, hints, bodyParam, bindingContext, exchange));
}
return Mono.just(adapter.fromPublisher(flux));
}
else {
// Single-value (with or without reactive type wrapper)
if (logger.isDebugEnabled()) {
logger.debug(exchange.getLogPrefix() + "0..1 [" + elementType + "]");
}
Mono<?> mono = reader.readMono(actualType, elementType, request, response, readHints);
mono = mono.onErrorResume(ex -> Mono.error(handleReadError(bodyParam, ex)));
if (isBodyRequired) {
mono = mono.switchIfEmpty(Mono.error(() -> handleMissingBody(bodyParam)));
}
if (hints != null) {
mono = mono.doOnNext(target ->
validate(target, hints, bodyParam, bindingContext, exchange));
}
return (adapter != null ? Mono.just(adapter.fromPublisher(mono)) : Mono.from(mono));
}
}
}
// No compatible reader but body may be empty..
HttpMethod method = request.getMethod();
if (contentType == null && method != null && SUPPORTED_METHODS.contains(method)) {
Flux<DataBuffer> body = request.getBody().doOnNext(o -> {
// Body not empty, back to 415..
throw new UnsupportedMediaTypeStatusException(mediaType, this.supportedMediaTypes, elementType);
});
if (isBodyRequired) {
body = body.switchIfEmpty(Mono.error(() -> handleMissingBody(bodyParam)));
}
return (adapter != null ? Mono.just(adapter.fromPublisher(body)) : Mono.from(body));
}
return Mono.error(new UnsupportedMediaTypeStatusException(mediaType, this.supportedMediaTypes, elementType));
}
Example 8
| Source File: RequestProcessor.java From spring-cloud-function with Apache License 2.0 | 4 votes |
|
private Publisher<?> body(Object handler, ServerWebExchange exchange) {
ResolvableType elementType = ResolvableType
.forClass(this.inspector.getInputType(handler));
// we effectively delegate type conversion to FunctionCatalog
elementType = ResolvableType.forClass(String.class);
ResolvableType actualType = elementType;
Class<?> resolvedType = elementType.resolve();
ReactiveAdapter adapter = (resolvedType != null
? getAdapterRegistry().getAdapter(resolvedType) : null);
ServerHttpRequest request = exchange.getRequest();
ServerHttpResponse response = exchange.getResponse();
MediaType contentType = request.getHeaders().getContentType();
MediaType mediaType = (contentType != null ? contentType
: MediaType.APPLICATION_OCTET_STREAM);
if (logger.isDebugEnabled()) {
logger.debug(exchange.getLogPrefix() + (contentType != null
? "Content-Type:" + contentType
: "No Content-Type, using " + MediaType.APPLICATION_OCTET_STREAM));
}
boolean isBodyRequired = (adapter != null && !adapter.supportsEmpty());
MethodParameter bodyParam = new MethodParameter(handlerMethod(handler), 0);
for (HttpMessageReader<?> reader : getMessageReaders()) {
if (reader.canRead(elementType, mediaType)) {
Map<String, Object> readHints = Hints.from(Hints.LOG_PREFIX_HINT,
exchange.getLogPrefix());
if (adapter != null && adapter.isMultiValue()) {
if (logger.isDebugEnabled()) {
logger.debug(
exchange.getLogPrefix() + "0..N [" + elementType + "]");
}
Flux<?> flux = reader.read(actualType, elementType, request, response,
readHints);
flux = flux.onErrorResume(
ex -> Flux.error(handleReadError(bodyParam, ex)));
if (isBodyRequired) {
flux = flux.switchIfEmpty(
Flux.error(() -> handleMissingBody(bodyParam)));
}
return Mono.just(adapter.fromPublisher(flux));
}
else {
// Single-value (with or without reactive type wrapper)
if (logger.isDebugEnabled()) {
logger.debug(exchange.getLogPrefix() + "0..1 [" + elementType + "]");
}
Mono<?> mono = reader.readMono(actualType, elementType, request,
response, readHints).doOnNext(v -> {
if (logger.isDebugEnabled()) {
logger.debug("received: " + v);
}
});
mono = mono.onErrorResume(
ex -> Mono.error(handleReadError(bodyParam, ex)));
if (isBodyRequired) {
mono = mono.switchIfEmpty(
Mono.error(() -> handleMissingBody(bodyParam)));
}
return (adapter != null ? Mono.just(adapter.fromPublisher(mono))
: Mono.from(mono));
}
}
}
return Mono.error(new UnsupportedMediaTypeStatusException(mediaType,
Arrays.asList(MediaType.APPLICATION_JSON), elementType));
}
