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org.springframework.messaging.rsocket.DefaultRSocketRequester Maven / Gradle / Ivy
/*
* Copyright 2002-2019 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.messaging.rsocket;
import java.util.Collections;
import java.util.Map;
import java.util.function.Consumer;
import io.rsocket.Payload;
import io.rsocket.RSocket;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import org.springframework.core.ParameterizedTypeReference;
import org.springframework.core.ReactiveAdapter;
import org.springframework.core.ResolvableType;
import org.springframework.core.codec.Decoder;
import org.springframework.core.codec.Encoder;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.MimeType;
/**
* Default implementation of {@link RSocketRequester}.
*
* @author Rossen Stoyanchev
* @since 5.2
*/
final class DefaultRSocketRequester implements RSocketRequester {
private static final Map EMPTY_HINTS = Collections.emptyMap();
private final RSocket rsocket;
private final MimeType dataMimeType;
private final MimeType metadataMimeType;
private final RSocketStrategies strategies;
private final Mono emptyBufferMono;
DefaultRSocketRequester(
RSocket rsocket, MimeType dataMimeType, MimeType metadataMimeType,
RSocketStrategies strategies) {
Assert.notNull(rsocket, "RSocket is required");
Assert.notNull(dataMimeType, "'dataMimeType' is required");
Assert.notNull(metadataMimeType, "'metadataMimeType' is required");
Assert.notNull(strategies, "RSocketStrategies is required");
this.rsocket = rsocket;
this.dataMimeType = dataMimeType;
this.metadataMimeType = metadataMimeType;
this.strategies = strategies;
this.emptyBufferMono = Mono.just(this.strategies.dataBufferFactory().wrap(new byte[0]));
}
@Override
public RSocket rsocket() {
return this.rsocket;
}
@Override
public MimeType dataMimeType() {
return this.dataMimeType;
}
@Override
public MimeType metadataMimeType() {
return this.metadataMimeType;
}
@Override
public RequestSpec route(String route, Object... vars) {
return new DefaultRequestSpec(route, vars);
}
@Override
public RequestSpec metadata(Object metadata, @Nullable MimeType mimeType) {
return new DefaultRequestSpec(metadata, mimeType);
}
private static boolean isVoid(ResolvableType elementType) {
return (Void.class.equals(elementType.resolve()) || void.class.equals(elementType.resolve()));
}
private DataBufferFactory bufferFactory() {
return this.strategies.dataBufferFactory();
}
private class DefaultRequestSpec implements RequestSpec {
private final MetadataEncoder metadataEncoder = new MetadataEncoder(metadataMimeType(), strategies);
@Nullable
private Mono payloadMono;
@Nullable
private Flux payloadFlux;
public DefaultRequestSpec(String route, Object... vars) {
this.metadataEncoder.route(route, vars);
}
public DefaultRequestSpec(Object metadata, @Nullable MimeType mimeType) {
this.metadataEncoder.metadata(metadata, mimeType);
}
@Override
public RequestSpec metadata(Object metadata, MimeType mimeType) {
this.metadataEncoder.metadata(metadata, mimeType);
return this;
}
@Override
public RequestSpec metadata(Consumer> configurer) {
configurer.accept(this);
return this;
}
@Override
public RequestSpec data(Object data) {
Assert.notNull(data, "'data' must not be null");
createPayload(data, ResolvableType.NONE);
return this;
}
@Override
public RequestSpec data(Object producer, Class elementClass) {
Assert.notNull(producer, "'producer' must not be null");
Assert.notNull(elementClass, "'elementClass' must not be null");
ReactiveAdapter adapter = getAdapter(producer.getClass());
Assert.notNull(adapter, "'producer' type is unknown to ReactiveAdapterRegistry");
createPayload(adapter.toPublisher(producer), ResolvableType.forClass(elementClass));
return this;
}
@Nullable
private ReactiveAdapter getAdapter(Class aClass) {
return strategies.reactiveAdapterRegistry().getAdapter(aClass);
}
@Override
public RequestSpec data(Object producer, ParameterizedTypeReference elementTypeRef) {
Assert.notNull(producer, "'producer' must not be null");
Assert.notNull(elementTypeRef, "'elementTypeRef' must not be null");
ReactiveAdapter adapter = getAdapter(producer.getClass());
Assert.notNull(adapter, "'producer' type is unknown to ReactiveAdapterRegistry");
createPayload(adapter.toPublisher(producer), ResolvableType.forType(elementTypeRef));
return this;
}
private void createPayload(Object input, ResolvableType elementType) {
ReactiveAdapter adapter = getAdapter(input.getClass());
Publisher publisher;
if (input instanceof Publisher) {
publisher = (Publisher) input;
}
else if (adapter != null) {
publisher = adapter.toPublisher(input);
}
else {
ResolvableType type = ResolvableType.forInstance(input);
this.payloadMono = firstPayload(Mono.fromCallable(() -> encodeData(input, type, null)));
this.payloadFlux = null;
return;
}
if (isVoid(elementType) || (adapter != null && adapter.isNoValue())) {
this.payloadMono = Mono.when(publisher).then(firstPayload(emptyBufferMono));
this.payloadFlux = null;
return;
}
Encoder encoder = elementType != ResolvableType.NONE && !Object.class.equals(elementType.resolve()) ?
strategies.encoder(elementType, dataMimeType) : null;
if (adapter != null && !adapter.isMultiValue()) {
Mono data = Mono.from(publisher)
.map(value -> encodeData(value, elementType, encoder))
.switchIfEmpty(emptyBufferMono);
this.payloadMono = firstPayload(data);
this.payloadFlux = null;
return;
}
this.payloadMono = null;
this.payloadFlux = Flux.from(publisher)
.map(value -> encodeData(value, elementType, encoder))
.switchIfEmpty(emptyBufferMono)
.switchOnFirst((signal, inner) -> {
DataBuffer data = signal.get();
if (data != null) {
return firstPayload(Mono.fromCallable(() -> data))
.concatWith(inner.skip(1).map(PayloadUtils::createPayload));
}
else {
return inner.map(PayloadUtils::createPayload);
}
})
.doOnDiscard(Payload.class, Payload::release);
}
@SuppressWarnings("unchecked")
private DataBuffer encodeData(T value, ResolvableType elementType, @Nullable Encoder encoder) {
if (encoder == null) {
elementType = ResolvableType.forInstance(value);
encoder = strategies.encoder(elementType, dataMimeType);
}
return ((Encoder) encoder).encodeValue(
value, bufferFactory(), elementType, dataMimeType, EMPTY_HINTS);
}
/**
* Create the 1st request payload with encoded data and metadata.
* @param encodedData the encoded payload data; expected to not be empty!
*/
private Mono firstPayload(Mono encodedData) {
return Mono.zip(encodedData, this.metadataEncoder.encode())
.map(tuple -> PayloadUtils.createPayload(tuple.getT1(), tuple.getT2()))
.doOnDiscard(DataBuffer.class, DataBufferUtils::release)
.doOnDiscard(Payload.class, Payload::release);
}
@Override
public Mono send() {
return getPayloadMono().flatMap(rsocket::fireAndForget);
}
@Override
public Mono retrieveMono(Class dataType) {
return retrieveMono(ResolvableType.forClass(dataType));
}
@Override
public Mono retrieveMono(ParameterizedTypeReference dataTypeRef) {
return retrieveMono(ResolvableType.forType(dataTypeRef));
}
@SuppressWarnings("unchecked")
private Mono retrieveMono(ResolvableType elementType) {
Mono payloadMono = getPayloadMono().flatMap(rsocket::requestResponse);
if (isVoid(elementType)) {
return (Mono) payloadMono.then();
}
Decoder decoder = strategies.decoder(elementType, dataMimeType);
return (Mono) payloadMono.map(this::retainDataAndReleasePayload)
.map(dataBuffer -> decoder.decode(dataBuffer, elementType, dataMimeType, EMPTY_HINTS));
}
@Override
public Flux retrieveFlux(Class dataType) {
return retrieveFlux(ResolvableType.forClass(dataType));
}
@Override
public Flux retrieveFlux(ParameterizedTypeReference dataTypeRef) {
return retrieveFlux(ResolvableType.forType(dataTypeRef));
}
@SuppressWarnings("unchecked")
private Flux retrieveFlux(ResolvableType elementType) {
Flux payloadFlux = (this.payloadFlux != null ?
rsocket.requestChannel(this.payloadFlux) :
getPayloadMono().flatMapMany(rsocket::requestStream));
if (isVoid(elementType)) {
return payloadFlux.thenMany(Flux.empty());
}
Decoder decoder = strategies.decoder(elementType, dataMimeType);
return payloadFlux.map(this::retainDataAndReleasePayload).map(dataBuffer ->
(T) decoder.decode(dataBuffer, elementType, dataMimeType, EMPTY_HINTS));
}
private Mono getPayloadMono() {
Assert.state(this.payloadFlux == null, "No RSocket interaction with Flux request and Mono response.");
return this.payloadMono != null ? this.payloadMono : firstPayload(emptyBufferMono);
}
private DataBuffer retainDataAndReleasePayload(Payload payload) {
return PayloadUtils.retainDataAndReleasePayload(payload, bufferFactory());
}
}
}
