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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.nio.charset.StandardCharsets;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.function.BiFunction;
import org.springframework.aot.hint.annotation.Reflective;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.context.ApplicationEventPublisherAware;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.lang.Nullable;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHeaders;
import org.springframework.messaging.handler.CompositeMessageCondition;
import org.springframework.messaging.handler.DestinationPatternsMessageCondition;
import org.springframework.messaging.rsocket.RSocketRequester;
import org.springframework.messaging.rsocket.annotation.support.RSocketFrameTypeMessageCondition;
import org.springframework.messaging.rsocket.annotation.support.RSocketRequesterMethodArgumentResolver;
import org.springframework.util.Assert;
import org.springframework.util.ReflectionUtils;
/**
* An {@link IntegrationRSocketMessageHandler} extension for RSocket service side.
*
* In a plain Spring Integration application instances of this class are created by the
* {@link ServerRSocketConnector} internally and a new RSocket server is started over there.
* When an existing RSocket server is in use, an instance of this class has to be
* provided as a {@link #responder()} into that server and a {@link ServerRSocketConnector}
* should accept the same instance as a delegate.
*
* With a {@link #messageMappingCompatible} option this class also handles
* {@link org.springframework.messaging.handler.annotation.MessageMapping} methods,
* covering both Spring Integration and standard
* {@link org.springframework.messaging.rsocket.annotation.support.RSocketMessageHandler}
* functionality.
*
* @author Artem Bilan
*
* @since 5.2.1
*/
public class ServerRSocketMessageHandler extends IntegrationRSocketMessageHandler
implements ApplicationEventPublisherAware {
private static final Method HANDLE_CONNECTION_SETUP_METHOD =
ReflectionUtils.findMethod(ServerRSocketMessageHandler.class, "handleConnectionSetup", Message.class);
private final Map clientRSocketRequesters = new HashMap<>();
private BiFunction, DataBuffer, Object> clientRSocketKeyStrategy =
(headers, data) -> data.toString(StandardCharsets.UTF_8);
private ApplicationEventPublisher applicationEventPublisher;
/**
* Create an service side RSocket message handler instance for delegating
* to {@link IntegrationRSocketEndpoint} beans and collect {@link RSocketRequester}s
* from client connections.
*/
public ServerRSocketMessageHandler() {
this(false);
}
/**
* Create an service side RSocket message handler instance for delegating
* to {@link IntegrationRSocketEndpoint} beans and collect {@link RSocketRequester}s
* from client connections.
* When {@code messageMappingCompatible == true}, this class also handles
* {@link org.springframework.messaging.handler.annotation.MessageMapping} methods
* as it is done by the standard
* {@link org.springframework.messaging.rsocket.annotation.support.RSocketMessageHandler}.
* @param messageMappingCompatible whether handle also
* {@link org.springframework.messaging.handler.annotation.MessageMapping}.
*/
public ServerRSocketMessageHandler(boolean messageMappingCompatible) {
super(messageMappingCompatible);
}
/**
* Configure a {@link BiFunction} to extract a key for mapping connected {@link RSocketRequester}s.
* Defaults to the {@code destination} a client is connected.
* @param clientRSocketKeyStrategy the {@link BiFunction} to use.
*/
public void setClientRSocketKeyStrategy(
BiFunction, DataBuffer, Object> clientRSocketKeyStrategy) {
Assert.notNull(clientRSocketKeyStrategy, "'clientRSocketKeyStrategy' must not be null");
this.clientRSocketKeyStrategy = clientRSocketKeyStrategy;
}
/**
* Get connected {@link RSocketRequester}s mapped by the keys from the connect messages.
* @return the map of connected {@link RSocketRequester}s.
* @see #setClientRSocketKeyStrategy
*/
public Map getClientRSocketRequesters() {
return Collections.unmodifiableMap(this.clientRSocketRequesters);
}
/**
* Obtain a connected {@link RSocketRequester} mapped by provided key or null.
* @param key the key for mapped {@link RSocketRequester} if any.
* @return the mapped {@link RSocketRequester} or null.
*/
@Nullable
public RSocketRequester getClientRSocketRequester(Object key) {
return this.clientRSocketRequesters.get(key);
}
@Override
public void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher) {
this.applicationEventPublisher = applicationEventPublisher;
}
void registerHandleConnectionSetupMethod() {
registerHandlerMethod(this, HANDLE_CONNECTION_SETUP_METHOD,
new CompositeMessageCondition(
RSocketFrameTypeMessageCondition.CONNECT_CONDITION,
new DestinationPatternsMessageCondition(new String[] {"*"}, obtainRouteMatcher())));
}
@SuppressWarnings("unused")
@Reflective
private void handleConnectionSetup(Message connectMessage) {
DataBuffer dataBuffer = connectMessage.getPayload();
MessageHeaders messageHeaders = connectMessage.getHeaders();
Object rsocketRequesterKey = this.clientRSocketKeyStrategy.apply(messageHeaders, dataBuffer);
RSocketRequester rsocketRequester =
messageHeaders.get(RSocketRequesterMethodArgumentResolver.RSOCKET_REQUESTER_HEADER,
RSocketRequester.class);
this.clientRSocketRequesters.put(rsocketRequesterKey, rsocketRequester);
RSocketConnectedEvent rSocketConnectedEvent =
new RSocketConnectedEvent(this, messageHeaders, dataBuffer, rsocketRequester); // NOSONAR
if (this.applicationEventPublisher != null) {
this.applicationEventPublisher.publishEvent(rSocketConnectedEvent);
}
else {
if (logger.isInfoEnabled()) {
logger.info("The RSocket has been connected: " + rSocketConnectedEvent);
}
}
}
}