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/*
* Copyright 2019-2022 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.integration.rsocket;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;
import io.rsocket.Payload;
import io.rsocket.frame.FrameType;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import org.springframework.context.ApplicationContext;
import org.springframework.core.MethodParameter;
import org.springframework.core.ReactiveAdapterRegistry;
import org.springframework.core.codec.Encoder;
import org.springframework.lang.Nullable;
import org.springframework.messaging.Message;
import org.springframework.messaging.ReactiveMessageHandler;
import org.springframework.messaging.handler.CompositeMessageCondition;
import org.springframework.messaging.handler.DestinationPatternsMessageCondition;
import org.springframework.messaging.handler.invocation.reactive.HandlerMethodArgumentResolver;
import org.springframework.messaging.handler.invocation.reactive.HandlerMethodReturnValueHandler;
import org.springframework.messaging.handler.invocation.reactive.SyncHandlerMethodArgumentResolver;
import org.springframework.messaging.rsocket.annotation.support.RSocketFrameTypeMessageCondition;
import org.springframework.messaging.rsocket.annotation.support.RSocketMessageHandler;
import org.springframework.messaging.rsocket.annotation.support.RSocketPayloadReturnValueHandler;
import org.springframework.util.Assert;
import org.springframework.util.ReflectionUtils;
/**
* The {@link RSocketMessageHandler} extension for Spring Integration needs.
*
* This class adds an {@link IntegrationRSocketEndpoint} beans detection and registration functionality.
*
* @author Artem Bilan
*
* @since 5.2
*
* @see RSocketMessageHandler
*/
class IntegrationRSocketMessageHandler extends RSocketMessageHandler {
private static final Method HANDLE_MESSAGE_METHOD =
ReflectionUtils.findMethod(ReactiveMessageHandler.class, "handleMessage", Message.class);
protected final boolean messageMappingCompatible; // NOSONAR final
IntegrationRSocketMessageHandler() {
this(false);
}
IntegrationRSocketMessageHandler(boolean messageMappingCompatible) {
this.messageMappingCompatible = messageMappingCompatible;
if (!this.messageMappingCompatible) {
setHandlerPredicate((clazz) -> false);
}
}
public boolean detectEndpoints() {
ApplicationContext applicationContext = getApplicationContext();
boolean endpointsDetected = false;
if (applicationContext != null && getHandlerMethods().isEmpty()) {
Collection endpoints =
applicationContext.getBeansOfType(IntegrationRSocketEndpoint.class)
.values();
for (IntegrationRSocketEndpoint endpoint : endpoints) {
addEndpoint(endpoint);
endpointsDetected = true;
}
}
return endpointsDetected;
}
public void addEndpoint(IntegrationRSocketEndpoint endpoint) {
RSocketFrameTypeMessageCondition frameTypeMessageCondition = RSocketFrameTypeMessageCondition.EMPTY_CONDITION;
RSocketInteractionModel[] interactionModels = endpoint.getInteractionModels();
if (interactionModels.length > 0) {
frameTypeMessageCondition =
new RSocketFrameTypeMessageCondition(
Arrays.stream(interactionModels)
.map(RSocketInteractionModel::getFrameType)
.toArray(FrameType[]::new));
}
registerHandlerMethod(endpoint, HANDLE_MESSAGE_METHOD,
new CompositeMessageCondition(
frameTypeMessageCondition,
new DestinationPatternsMessageCondition(endpoint.getPath(), getRouteMatcher()))); // NOSONAR
}
@Override
protected List initArgumentResolvers() {
if (this.messageMappingCompatible) {
// Add argument resolver before parent initializes argument resolution
getArgumentResolverConfigurer().addCustomResolver(new MessageHandlerMethodArgumentResolver());
return super.initArgumentResolvers();
}
else {
return Collections.singletonList(new MessageHandlerMethodArgumentResolver());
}
}
@Override
@SuppressWarnings("unchecked")
protected List initReturnValueHandlers() {
HandlerMethodReturnValueHandler integrationRSocketPayloadReturnValueHandler =
new IntegrationRSocketPayloadReturnValueHandler((List>) getEncoders(),
getReactiveAdapterRegistry());
if (this.messageMappingCompatible) {
List handlers = new ArrayList<>();
handlers.add(integrationRSocketPayloadReturnValueHandler);
handlers.addAll(getReturnValueHandlerConfigurer().getCustomHandlers());
return handlers;
}
else {
return Collections.singletonList(integrationRSocketPayloadReturnValueHandler);
}
}
protected static final class MessageHandlerMethodArgumentResolver implements SyncHandlerMethodArgumentResolver {
@Override
public boolean supportsParameter(MethodParameter parameter) {
return Message.class.equals(parameter.getParameterType());
}
@Override
public Object resolveArgumentValue(MethodParameter parameter, Message message) {
return message;
}
}
protected static final class IntegrationRSocketPayloadReturnValueHandler extends RSocketPayloadReturnValueHandler {
protected IntegrationRSocketPayloadReturnValueHandler(List> encoders,
ReactiveAdapterRegistry registry) {
super(encoders, registry);
}
@Override
public Mono handleReturnValue(@Nullable Object returnValue, MethodParameter returnType,
Message message) {
AtomicReference> responseReference = getResponseReference(message);
if (returnValue == null && responseReference != null) {
return super.handleReturnValue(responseReference.get(), returnType, message);
}
else {
return super.handleReturnValue(returnValue, returnType, message);
}
}
@Nullable
@SuppressWarnings("unchecked")
private static AtomicReference> getResponseReference(Message message) {
Object headerValue = message.getHeaders().get(RESPONSE_HEADER);
Assert.state(headerValue == null || headerValue instanceof AtomicReference, "Expected AtomicReference");
return (AtomicReference>) headerValue;
}
}
}