org.springframework.messaging.simp.broker.AbstractSubscriptionRegistry Maven / Gradle / Ivy
/*
* Copyright 2002-2018 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
*
* http://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.simp.broker;
import org.apache.commons.logging.Log;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHeaders;
import org.springframework.messaging.simp.SimpLogging;
import org.springframework.messaging.simp.SimpMessageHeaderAccessor;
import org.springframework.messaging.simp.SimpMessageType;
import org.springframework.util.CollectionUtils;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
/**
* Abstract base class for implementations of {@link SubscriptionRegistry} that
* looks up information in messages but delegates to abstract methods for the
* actual storage and retrieval.
*
* @author Rossen Stoyanchev
* @since 4.0
*/
public abstract class AbstractSubscriptionRegistry implements SubscriptionRegistry {
private static final MultiValueMap EMPTY_MAP =
CollectionUtils.unmodifiableMultiValueMap(new LinkedMultiValueMap<>());
protected final Log logger = SimpLogging.forLogName(getClass());
@Override
public final void registerSubscription(Message message) {
MessageHeaders headers = message.getHeaders();
SimpMessageType messageType = SimpMessageHeaderAccessor.getMessageType(headers);
if (!SimpMessageType.SUBSCRIBE.equals(messageType)) {
throw new IllegalArgumentException("Expected SUBSCRIBE: " + message);
}
String sessionId = SimpMessageHeaderAccessor.getSessionId(headers);
if (sessionId == null) {
if (logger.isErrorEnabled()) {
logger.error("No sessionId in " + message);
}
return;
}
String subscriptionId = SimpMessageHeaderAccessor.getSubscriptionId(headers);
if (subscriptionId == null) {
if (logger.isErrorEnabled()) {
logger.error("No subscriptionId in " + message);
}
return;
}
String destination = SimpMessageHeaderAccessor.getDestination(headers);
if (destination == null) {
if (logger.isErrorEnabled()) {
logger.error("No destination in " + message);
}
return;
}
addSubscriptionInternal(sessionId, subscriptionId, destination, message);
}
@Override
public final void unregisterSubscription(Message message) {
MessageHeaders headers = message.getHeaders();
SimpMessageType messageType = SimpMessageHeaderAccessor.getMessageType(headers);
if (!SimpMessageType.UNSUBSCRIBE.equals(messageType)) {
throw new IllegalArgumentException("Expected UNSUBSCRIBE: " + message);
}
String sessionId = SimpMessageHeaderAccessor.getSessionId(headers);
if (sessionId == null) {
if (logger.isErrorEnabled()) {
logger.error("No sessionId in " + message);
}
return;
}
String subscriptionId = SimpMessageHeaderAccessor.getSubscriptionId(headers);
if (subscriptionId == null) {
if (logger.isErrorEnabled()) {
logger.error("No subscriptionId " + message);
}
return;
}
removeSubscriptionInternal(sessionId, subscriptionId, message);
}
@Override
public final MultiValueMap findSubscriptions(Message message) {
MessageHeaders headers = message.getHeaders();
SimpMessageType type = SimpMessageHeaderAccessor.getMessageType(headers);
if (!SimpMessageType.MESSAGE.equals(type)) {
throw new IllegalArgumentException("Unexpected message type: " + type);
}
String destination = SimpMessageHeaderAccessor.getDestination(headers);
if (destination == null) {
if (logger.isErrorEnabled()) {
logger.error("No destination in " + message);
}
return EMPTY_MAP;
}
return findSubscriptionsInternal(destination, message);
}
protected abstract void addSubscriptionInternal(
String sessionId, String subscriptionId, String destination, Message message);
protected abstract void removeSubscriptionInternal(
String sessionId, String subscriptionId, Message message);
protected abstract MultiValueMap findSubscriptionsInternal(
String destination, Message message);
}