/*
* Copyright (c) 2012-2015 The original author or authors
* ------------------------------------------------------
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Apache License v2.0 which accompanies this distribution.
*
* The Eclipse Public License is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* The Apache License v2.0 is available at
* http://www.opensource.org/licenses/apache2.0.php
*
* You may elect to redistribute this code under either of these licenses.
*/
package org.eclipse.moquette.spi.persistence;
import org.eclipse.moquette.proto.MQTTException;
import org.eclipse.moquette.spi.IMatchingCondition;
import org.eclipse.moquette.spi.IMessagesStore;
import org.eclipse.moquette.spi.ISessionsStore;
import org.eclipse.moquette.spi.impl.events.PublishEvent;
import org.eclipse.moquette.spi.impl.storage.StoredPublishEvent;
import org.eclipse.moquette.spi.impl.subscriptions.Subscription;
import org.eclipse.moquette.proto.messages.AbstractMessage;
import static org.eclipse.moquette.spi.impl.Utils.defaultGet;
import org.mapdb.DB;
import org.mapdb.DBMaker;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.File;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.*;
import java.util.concurrent.ConcurrentMap;
/**
* MapDB main persistence implementation
*/
public class MapDBPersistentStore implements IMessagesStore, ISessionsStore {
private static final Logger LOG = LoggerFactory.getLogger(MapDBPersistentStore.class);
private ConcurrentMap<String, StoredMessage> m_retainedStore;
//maps clientID to the list of pending messages stored
private ConcurrentMap<String, List<StoredPublishEvent>> m_persistentMessageStore;
//bind clientID+MsgID -> evt message published
private ConcurrentMap<String, StoredPublishEvent> m_inflightStore;
//map clientID <-> set of currently in flight packet identifiers
Map<String, Set<Integer>> m_inFlightIds;
//bind clientID+MsgID -> evt message published
private ConcurrentMap<String, StoredPublishEvent> m_qos2Store;
//persistent Map of clientID, set of Subscriptions
private ConcurrentMap<String, Set<Subscription>> m_persistentSubscriptions;
private DB m_db;
private String m_storePath;
/*
* The default constructor will create an in memory store as no file path was specified
*/
public MapDBPersistentStore() {
this.m_storePath = "";
}
public MapDBPersistentStore(String storePath) {
this.m_storePath = storePath;
}
@Override
public void initStore() {
if (m_storePath == null || m_storePath.isEmpty()) {
m_db = DBMaker.newMemoryDB().make();
} else {
File tmpFile;
try {
tmpFile = new File(m_storePath);
tmpFile.createNewFile();
} catch (IOException ex) {
LOG.error(null, ex);
throw new MQTTException("Can't create temp file for subscriptions storage [" + m_storePath + "]", ex);
}
m_db = DBMaker.newFileDB(tmpFile).make();
}
m_retainedStore = m_db.getHashMap("retained");
m_persistentMessageStore = m_db.getHashMap("persistedMessages");
m_inflightStore = m_db.getHashMap("inflight");
m_inFlightIds = m_db.getHashMap("inflightPacketIDs");
m_persistentSubscriptions = m_db.getHashMap("subscriptions");
m_qos2Store = m_db.getHashMap("qos2Store");
}
@Override
public void cleanRetained(String topic) {
m_retainedStore.remove(topic);
}
@Override
public void storeRetained(String topic, byte[] message, AbstractMessage.QOSType qos) {
//store the message to the topic
m_retainedStore.put(topic, new StoredMessage(message, qos, topic));
m_db.commit();
}
@Override
public Collection<StoredMessage> searchMatching(IMatchingCondition condition) {
LOG.debug("searchMatching scanning all retained messages, presents are {}", m_retainedStore.size());
List<StoredMessage> results = new ArrayList<StoredMessage>();
for (Map.Entry<String, StoredMessage> entry : m_retainedStore.entrySet()) {
StoredMessage storedMsg = entry.getValue();
if (condition.match(entry.getKey())) {
results.add(storedMsg);
}
}
return results;
}
@Override
public void storePublishForFuture(PublishEvent evt) {
List<StoredPublishEvent> storedEvents;
String clientID = evt.getClientID();
if (!m_persistentMessageStore.containsKey(clientID)) {
storedEvents = new ArrayList<>();
} else {
storedEvents = m_persistentMessageStore.get(clientID);
}
storedEvents.add(convertToStored(evt));
m_persistentMessageStore.put(clientID, storedEvents);
m_db.commit();
//NB rewind the evt message content
LOG.debug("Stored published message for client <{}> on topic <{}>", clientID, evt.getTopic());
}
@Override
public List<PublishEvent> listMessagesInSession(String clientID) {
List<PublishEvent> liveEvts = new ArrayList<>();
List<StoredPublishEvent> storedEvts = defaultGet(m_persistentMessageStore, clientID, Collections.<StoredPublishEvent> emptyList());
for (StoredPublishEvent storedEvt : storedEvts) {
liveEvts.add(convertFromStored(storedEvt));
}
return liveEvts;
}
@Override
public void removeMessageInSession(String clientID, int messageID) {
List<StoredPublishEvent> events = m_persistentMessageStore.get(clientID);
if (events == null) {
return;
}
StoredPublishEvent toRemoveEvt = null;
for (StoredPublishEvent evt : events) {
if (evt.getMessageID() == messageID) {
toRemoveEvt = evt;
}
}
events.remove(toRemoveEvt);
m_persistentMessageStore.put(clientID, events);
m_db.commit();
}
public void dropMessagesInSession(String clientID) {
m_persistentMessageStore.remove(clientID);
m_db.commit();
}
//----------------- In flight methods -----------------
@Override
public void cleanInFlight(String clientID, int packetID) {
String publishKey = String.format("%s%d", clientID, packetID);
m_inflightStore.remove(publishKey);
Set<Integer> inFlightForClient = this.m_inFlightIds.get(clientID);
if (inFlightForClient != null) {
inFlightForClient.remove(packetID);
}
m_db.commit();
}
@Override
public void addInFlight(PublishEvent evt, String clientID, int packetID) {
String publishKey = String.format("%s%d", clientID, packetID);
StoredPublishEvent storedEvt = convertToStored(evt);
m_inflightStore.put(publishKey, storedEvt);
m_db.commit();
}
/**
* Return the next valid packetIdentifer for the given client session.
* */
@Override
public int nextPacketID(String clientID) {
Set<Integer> inFlightForClient = this.m_inFlightIds.get(clientID);
if (inFlightForClient == null) {
int nextPacketId = 1;
inFlightForClient = new HashSet<>();
inFlightForClient.add(nextPacketId);
this.m_inFlightIds.put(clientID, inFlightForClient);
return nextPacketId;
}
int maxId = Collections.max(inFlightForClient);
int nextPacketId = (maxId + 1) % 0xFFFF;
inFlightForClient.add(nextPacketId);
return nextPacketId;
}
public void addNewSubscription(Subscription newSubscription, String clientID) {
LOG.debug("addNewSubscription invoked with subscription {} for client {}", newSubscription, clientID);
if (!m_persistentSubscriptions.containsKey(clientID)) {
LOG.debug("clientID {} is a newcome, creating it's subscriptions set", clientID);
m_persistentSubscriptions.put(clientID, new HashSet<Subscription>());
}
Set<Subscription> subs = m_persistentSubscriptions.get(clientID);
if (!subs.contains(newSubscription)) {
LOG.debug("updating clientID {} subscriptions set with new subscription", clientID);
//TODO check the subs doesn't contain another subscription to the same topic with different
Subscription existingSubscription = null;
for (Subscription scanSub : subs) {
if (newSubscription.getTopicFilter().equals(scanSub.getTopicFilter())) {
existingSubscription = scanSub;
break;
}
}
if (existingSubscription != null) {
subs.remove(existingSubscription);
}
subs.add(newSubscription);
m_persistentSubscriptions.put(clientID, subs);
LOG.debug("clientID {} subscriptions set now is {}", clientID, subs);
}
m_db.commit();
}
public void wipeSubscriptions(String clientID) {
m_persistentSubscriptions.remove(clientID);
m_db.commit();
}
@Override
public void updateSubscriptions(String clientID, Set<Subscription> subscriptions) {
m_persistentSubscriptions.put(clientID, subscriptions);
m_db.commit();
}
public List<Subscription> listAllSubscriptions() {
List<Subscription> allSubscriptions = new ArrayList<Subscription>();
for (Map.Entry<String, Set<Subscription>> entry : m_persistentSubscriptions.entrySet()) {
allSubscriptions.addAll(entry.getValue());
}
LOG.debug("retrieveAllSubscriptions returning subs {}", allSubscriptions);
return allSubscriptions;
}
@Override
public boolean contains(String clientID) {
return m_persistentSubscriptions.containsKey(clientID);
}
public void close() {
this.m_db.commit();
LOG.debug("persisted subscriptions {}", m_persistentSubscriptions);
this.m_db.close();
LOG.debug("closed disk storage");
}
/*-------- QoS 2 storage management --------------*/
public void persistQoS2Message(String publishKey, PublishEvent evt) {
LOG.debug("persistQoS2Message store pubKey: {}, evt: {}", publishKey, evt);
m_qos2Store.put(publishKey, convertToStored(evt));
}
public void removeQoS2Message(String publishKey) {
LOG.debug("Removing stored Q0S2 message <{}>", publishKey);
m_qos2Store.remove(publishKey);
}
public PublishEvent retrieveQoS2Message(String publishKey) {
StoredPublishEvent storedEvt = m_qos2Store.get(publishKey);
return convertFromStored(storedEvt);
}
private StoredPublishEvent convertToStored(PublishEvent evt) {
StoredPublishEvent storedEvt = new StoredPublishEvent(evt);
return storedEvt;
}
private PublishEvent convertFromStored(StoredPublishEvent evt) {
byte[] message = evt.getMessage();
PublishEvent liveEvt = new PublishEvent(evt.getTopic(), evt.getQos(), message, evt.isRetain(), evt.getClientID(), evt.getMessageID());
return liveEvt;
}
}