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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.activemq.transport.mqtt.strategy;
import java.io.IOException;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.apache.activemq.ActiveMQPrefetchPolicy;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.ActiveMQTopic;
import org.apache.activemq.command.ConsumerInfo;
import org.apache.activemq.command.RemoveSubscriptionInfo;
import org.apache.activemq.command.Response;
import org.apache.activemq.command.SubscriptionInfo;
import org.apache.activemq.store.PersistenceAdapterSupport;
import org.apache.activemq.transport.mqtt.MQTTProtocolConverter;
import org.apache.activemq.transport.mqtt.MQTTProtocolException;
import org.apache.activemq.transport.mqtt.MQTTProtocolSupport;
import org.apache.activemq.transport.mqtt.MQTTSubscription;
import org.apache.activemq.transport.mqtt.ResponseHandler;
import org.fusesource.mqtt.client.QoS;
import org.fusesource.mqtt.client.Topic;
import org.fusesource.mqtt.codec.CONNECT;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Default implementation that uses unmapped topic subscriptions.
*/
public class MQTTDefaultSubscriptionStrategy extends AbstractMQTTSubscriptionStrategy {
private static final Logger LOG = LoggerFactory.getLogger(MQTTDefaultSubscriptionStrategy.class);
private final Set restoredSubs = Collections.synchronizedSet(new HashSet());
@Override
public void onConnect(CONNECT connect) throws MQTTProtocolException {
List subs;
try {
subs = PersistenceAdapterSupport.listSubscriptions(brokerService.getPersistenceAdapter(), protocol.getClientId());
} catch (IOException e) {
throw new MQTTProtocolException("Error loading store subscriptions", true, e);
}
if (connect.cleanSession()) {
deleteDurableSubs(subs);
} else {
restoreDurableSubs(subs);
}
}
@Override
public byte onSubscribe(String topicName, QoS requestedQoS) throws MQTTProtocolException {
ActiveMQDestination destination = new ActiveMQTopic(MQTTProtocolSupport.convertMQTTToActiveMQ(topicName));
ConsumerInfo consumerInfo = new ConsumerInfo(getNextConsumerId());
consumerInfo.setDestination(destination);
consumerInfo.setPrefetchSize(ActiveMQPrefetchPolicy.DEFAULT_TOPIC_PREFETCH);
consumerInfo.setRetroactive(true);
consumerInfo.setDispatchAsync(true);
// create durable subscriptions only when clean session is false
if (!protocol.isCleanSession() && protocol.getClientId() != null && requestedQoS.ordinal() >= QoS.AT_LEAST_ONCE.ordinal()) {
consumerInfo.setSubscriptionName(requestedQoS + ":" + topicName);
consumerInfo.setPrefetchSize(ActiveMQPrefetchPolicy.DEFAULT_DURABLE_TOPIC_PREFETCH);
}
if (protocol.getActiveMQSubscriptionPrefetch() > 0) {
consumerInfo.setPrefetchSize(protocol.getActiveMQSubscriptionPrefetch());
}
return doSubscribe(consumerInfo, topicName, requestedQoS);
}
@Override
public void onReSubscribe(MQTTSubscription mqttSubscription) throws MQTTProtocolException {
ActiveMQDestination destination = mqttSubscription.getDestination();
// check whether the Topic has been recovered in restoreDurableSubs
// mark subscription available for recovery for duplicate subscription
if (restoredSubs.remove(destination.getPhysicalName())) {
return;
}
super.onReSubscribe(mqttSubscription);
}
@Override
public void onUnSubscribe(String topicName) throws MQTTProtocolException {
MQTTSubscription subscription = mqttSubscriptionByTopic.remove(topicName);
if (subscription != null) {
doUnSubscribe(subscription);
// check if the durable sub also needs to be removed
if (subscription.getConsumerInfo().getSubscriptionName() != null) {
// also remove it from restored durable subscriptions set
restoredSubs.remove(MQTTProtocolSupport.convertMQTTToActiveMQ(subscription.getTopicName()));
RemoveSubscriptionInfo rsi = new RemoveSubscriptionInfo();
rsi.setConnectionId(protocol.getConnectionId());
rsi.setSubscriptionName(subscription.getConsumerInfo().getSubscriptionName());
rsi.setClientId(protocol.getClientId());
protocol.sendToActiveMQ(rsi, new ResponseHandler() {
@Override
public void onResponse(MQTTProtocolConverter converter, Response response) throws IOException {
// ignore failures..
}
});
}
}
}
private void deleteDurableSubs(List subs) {
try {
for (SubscriptionInfo sub : subs) {
RemoveSubscriptionInfo rsi = new RemoveSubscriptionInfo();
rsi.setConnectionId(protocol.getConnectionId());
rsi.setSubscriptionName(sub.getSubcriptionName());
rsi.setClientId(sub.getClientId());
protocol.sendToActiveMQ(rsi, new ResponseHandler() {
@Override
public void onResponse(MQTTProtocolConverter converter, Response response) throws IOException {
// ignore failures..
}
});
}
} catch (Throwable e) {
LOG.warn("Could not delete the MQTT durable subs.", e);
}
}
private void restoreDurableSubs(List subs) {
try {
for (SubscriptionInfo sub : subs) {
String name = sub.getSubcriptionName();
String[] split = name.split(":", 2);
QoS qoS = QoS.valueOf(split[0]);
onSubscribe(new Topic(split[1], qoS));
// mark this durable subscription as restored by Broker
restoredSubs.add(split[1]);
}
} catch (IOException e) {
LOG.warn("Could not restore the MQTT durable subs.", e);
}
}
}