本文介紹了從春季反應(yīng)式客戶端請(qǐng)求中獲得身體作為弦的熱門嗎？的處理方法，對(duì)大家解決問題具有一定的參考價(jià)值，需要的朋友們下面隨著小編來一起學(xué)習(xí)吧！
問題描述
在測試方法中，收到org.springframework.web.reactive.function.client.ClientRequest的實(shí)例。
我要驗(yàn)證其HttpMethod、URI和Body。
如何獲得除身體以外的所有東西是相當(dāng)明顯的。
ClientRequest request = makeInstance(...);
assertEquals(HttpMethod.POST, request.method());
assertEquals("somewhere/else", request.url().toString());
// ? unclear how to extract body using the BodyInserter
BodyInserter<?, ? super ClientHttpRequest> inserter = request.body();
inserter.insert(%outputMessage%, %context%);
我在Spring的源代碼中找到了how BodyInserters are tested。如何創(chuàng)建BodyInserter.Context(第二個(gè)參數(shù))我大概很清楚，但我不明白如何構(gòu)造第一個(gè)參數(shù)，所以可以通過它提取請(qǐng)求正文。
請(qǐng)顯示從ClientRequest實(shí)例獲取請(qǐng)求正文的常規(guī)(或至少可用)方法。
推薦答案
對(duì)于這么簡單的情況來說有點(diǎn)復(fù)雜，但我實(shí)現(xiàn)了5個(gè)類，從ClientRequest中提取了一個(gè)正文。
這似乎太多了，我仍然很好奇這個(gè)問題是否有一個(gè)短期的解決方案。歡迎您對(duì)這個(gè)問題提出另一個(gè)答案，這樣我就可以接受了。
遺憾的是，<[2-2]、BodyInserters和org.springframework.web.reactive.***中的大多數(shù)其他內(nèi)容的設(shè)計(jì)都有很大的改進(jìn)空間。目前，它只是一堆接口，每個(gè)接口都有大量的方法，測試代碼通常需要花費(fèi)大量的精力，具體取決于這些類。
使用此方法的主要目標(biāo)是：
static <T> T extractBody(ClientRequest request, Class<T> clazz) {
InsertionReceiver<T> receiver = InsertionReceiver.forClass(clazz);
return receiver.receiveValue(request.body());
}
以下是InsertionReceiver的實(shí)現(xiàn)：
import org.springframework.http.ReactiveHttpOutputMessage;
import org.springframework.web.reactive.function.BodyInserter;
public interface InsertionReceiver<T> {
T receiveValue(BodyInserter<?, ? extends ReactiveHttpOutputMessage> bodyInserter);
static <T> InsertionReceiver<T> forClass(Class<T> clazz) {
return new SimpleValueReceiver<>(clazz);
}
}
import java.util.concurrent.atomic.AtomicReference;
import org.springframework.http.ReactiveHttpOutputMessage;
import org.springframework.web.reactive.function.BodyInserter;
class SimpleValueReceiver<T> implements InsertionReceiver<T> {
private static final Object DUMMY = new Object();
private final Class<T> clazz;
private final AtomicReference<Object> reference;
SimpleValueReceiver(Class<T> clazz) {
this.clazz = clazz;
this.reference = new AtomicReference<>(DUMMY);
}
@Override
public T receiveValue(BodyInserter<?, ? extends ReactiveHttpOutputMessage> bodyInserter) {
demandValueFrom(bodyInserter);
return receivedValue();
}
private void demandValueFrom(BodyInserter<?, ? extends ReactiveHttpOutputMessage> bodyInserter) {
var inserter = (BodyInserter<?, ReactiveHttpOutputMessage>) bodyInserter;
inserter.insert(
MinimalHttpOutputMessage.INSTANCE,
new SingleWriterContext(new WriteToConsumer<>(reference::set))
);
}
private T receivedValue() {
Object value = reference.get();
reference.set(DUMMY);
T validatedValue;
if (value == DUMMY) {
throw new RuntimeException("Value was not received, Check your inserter worked properly");
} else if (!clazz.isAssignableFrom(value.getClass())) {
throw new RuntimeException(
"Value has unexpected type ("
+ value.getClass().getTypeName()
+ ") instead of (" + clazz.getTypeName() + ")");
} else {
validatedValue = clazz.cast(value);
}
return validatedValue;
}
}
class WriteToConsumer<T> implements HttpMessageWriter<T> {
private final Consumer<T> consumer;
private final List<MediaType> mediaTypes;
WriteToConsumer(Consumer<T> consumer) {
this.consumer = consumer;
this.mediaTypes = Collections.singletonList(MediaType.ALL);
}
@Override
public List<MediaType> getWritableMediaTypes() {
return mediaTypes;
}
@Override
public boolean canWrite(ResolvableType elementType, MediaType mediaType) {
return true;
}
@Override
public Mono<Void> write(
Publisher<? extends T> inputStream,
ResolvableType elementType,
MediaType mediaType,
ReactiveHttpOutputMessage message,
Map<String, Object> hints
) {
inputStream.subscribe(new OneValueConsumption<>(consumer));
return Mono.empty();
}
}
class MinimalHttpOutputMessage implements ReactiveHttpOutputMessage {
public static MinimalHttpOutputMessage INSTANCE = new MinimalHttpOutputMessage();
private MinimalHttpOutputMessage() {
}
@Override
public HttpHeaders getHeaders() {
return HttpHeaders.EMPTY;
}
// other overridden methods are omitted as they do nothing,
// i.e. return null, false, or have empty bodies
}
class OneValueConsumption<T> implements Subscriber<T> {
private final Consumer<T> consumer;
private int remainedAccepts;
public OneValueConsumption(Consumer<T> consumer) {
this.consumer = Objects.requireNonNull(consumer);
this.remainedAccepts = 1;
}
@Override
public void onSubscribe(Subscription s) {
s.request(1);
}
@Override
public void onNext(T o) {
if (remainedAccepts > 0) {
consumer.accept(o);
remainedAccepts -= 1;
} else {
throw new RuntimeException("No more values can be consumed");
}
}
@Override
public void onError(Throwable t) {
throw new RuntimeException("Single value was not consumed", t);
}
@Override
public void onComplete() {
// nothing
}
}
class SingleWriterContext implements BodyInserter.Context {
private final List<HttpMessageWriter<?>> singleWriterList;
SingleWriterContext(HttpMessageWriter<?> writer) {
this.singleWriterList = List.of(writer);
}
@Override
public List<HttpMessageWriter<?>> messageWriters() {
return singleWriterList;
}
@Override
public Optional<ServerHttpRequest> serverRequest() {
return Optional.empty();
}
@Override
public Map<String, Object> hints() {
return null;
}
}
這篇關(guān)于從春季反應(yīng)式客戶端請(qǐng)求中獲得身體作為弦的熱門嗎？的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，
