208 lines
8.1 KiB
Java
208 lines
8.1 KiB
Java
/*
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* Copyright (c) 2012-2017 The original author or authorsgetRockQuestions()
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* ------------------------------------------------------
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* and Apache License v2.0 which accompanies this distribution.
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*
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* The Eclipse Public License is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* The Apache License v2.0 is available at
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* http://www.opensource.org/licenses/apache2.0.php
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*
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* You may elect to redistribute this code under either of these licenses.
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*/
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package io.moquette.spi;
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import io.moquette.spi.ISessionsStore.ClientTopicCouple;
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import io.moquette.spi.impl.subscriptions.Subscription;
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import io.moquette.spi.impl.subscriptions.SubscriptionsStore;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.util.HashSet;
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import java.util.Set;
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import java.util.concurrent.BlockingQueue;
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/**
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* Model a Session like describe on page 25 of MQTT 3.1.1 specification:
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* The Session state in the Server consists of:
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* <ul>
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* <li>The existence of a Session, even if the rest of the Session state is empty.</li>
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* <li>The Client’s subscriptions.</li>
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* <li>QoS 1 and QoS 2 messages which have been sent to the Client, but have not been
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* completely acknowledged.</li>
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* <li>QoS 1 and QoS 2 messages pending transmission to the Client.</li>
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* <li>QoS 2 messages which have been received from the Client, but have not been
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* completely acknowledged.</li>
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* <li>Optionally, QoS 0 messages pending transmission to the Client.</li>
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* </ul>
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*
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* @author andrea
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*/
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public class ClientSession {
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private final static Logger LOG = LoggerFactory.getLogger(ClientSession.class);
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public final String clientID;
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private final IMessagesStore messagesStore;
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private final ISessionsStore m_sessionsStore;
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private Set<Subscription> subscriptions = new HashSet<>();
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private volatile boolean cleanSession;
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// private BlockingQueue<AbstractMessage> m_queueToPublish = new ArrayBlockingQueue<>(Constants.MAX_MESSAGE_QUEUE);
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public ClientSession(String clientID, IMessagesStore messagesStore, ISessionsStore sessionsStore,
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boolean cleanSession) {
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this.clientID = clientID;
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this.messagesStore = messagesStore;
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this.m_sessionsStore = sessionsStore;
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this.cleanSession = cleanSession;
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}
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/**
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* Return the list of persisted publishes for the given clientID.
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* For QoS1 and QoS2 with clean session flag, this method return the list of
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* missed publish events while the client was disconnected.
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*
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* @return the list of messages to be delivered for client related to the session.
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* */
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public BlockingQueue<IMessagesStore.StoredMessage> queue() {
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LOG.info("Retrieving stored messages. MqttClientId = {}.", clientID);
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return this.m_sessionsStore.queue(clientID);
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}
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@Override
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public String toString() {
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return "ClientSession{clientID='" + clientID + '\'' +"}";
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}
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public boolean subscribe(Subscription newSubscription) {
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LOG.info("Adding new subscription. MqttClientId = {}, topics = {}, qos = {}.", newSubscription.getClientId(),
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newSubscription.getTopicFilter(), newSubscription.getRequestedQos());
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boolean validTopic = SubscriptionsStore.validate(newSubscription.getTopicFilter());
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if (!validTopic) {
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LOG.warn("The topic filter is not valid. MqttClientId = {}, topics = {}.", newSubscription.getClientId(),
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newSubscription.getTopicFilter());
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//send SUBACK with 0x80 for this topic filter
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return false;
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}
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ClientTopicCouple matchingCouple = new ClientTopicCouple(this.clientID, newSubscription.getTopicFilter());
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Subscription existingSub = m_sessionsStore.getSubscription(matchingCouple);
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//update the selected subscriptions if not present or if has a greater qos
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if (existingSub == null || existingSub.getRequestedQos().value() < newSubscription.getRequestedQos().value()) {
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if (existingSub != null) {
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LOG.info("The subscription already existed with a lower QoS value. It will be updated. MqttClientId = {}, topics = {}, existingQos = {}, newQos = {}.",
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newSubscription.getClientId(), newSubscription.getTopicFilter(), existingSub.getRequestedQos(),
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newSubscription.getRequestedQos());
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subscriptions.remove(newSubscription);
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}
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subscriptions.add(newSubscription);
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m_sessionsStore.addNewSubscription(newSubscription);
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}
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return true;
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}
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public void unsubscribeFrom(String topicFilter) {
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LOG.info("Removing subscription. MqttClientID = {}, topics = {}.", clientID, topicFilter);
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m_sessionsStore.removeSubscription(topicFilter, clientID);
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Set<Subscription> subscriptionsToRemove = new HashSet<>();
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for (Subscription sub : this.subscriptions) {
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if (sub.getTopicFilter().equals(topicFilter)) {
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subscriptionsToRemove.add(sub);
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}
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}
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subscriptions.removeAll(subscriptionsToRemove);
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}
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public void disconnect() {
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if (this.cleanSession) {
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LOG.info("The client has disconnected. Removing its subscriptions. MqttClientId = {}.", clientID);
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//cleanup topic subscriptions
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cleanSession();
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}
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}
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public void cleanSession() {
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LOG.info("Wiping existing subscriptions. MqttClientId = {}.", this.clientID);
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m_sessionsStore.wipeSubscriptions(this.clientID);
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//remove also the messages stored of type QoS1/2
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LOG.info("Removing stored messages with QoS 1 and 2. MqttClientId = {}.", this.clientID);
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messagesStore.dropMessagesInSession(this.clientID);
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}
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public boolean isCleanSession() {
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return this.cleanSession;
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}
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public void cleanSession(boolean cleanSession) {
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this.cleanSession = cleanSession;
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this.m_sessionsStore.updateCleanStatus(this.clientID, cleanSession);
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}
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public int nextPacketId() {
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return this.m_sessionsStore.nextPacketID(this.clientID);
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}
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public void inFlightAcknowledged(int messageID) {
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if (LOG.isTraceEnabled())
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LOG.trace("Acknowledging inflight, clientID <{}> messageID {}", this.clientID, messageID);
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m_sessionsStore.inFlightAck(this.clientID, messageID);
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}
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public void inFlightAckWaiting(MessageGUID guid, int messageID) {
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if (LOG.isTraceEnabled())
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LOG.trace("Adding to inflight {}, guid <{}>", messageID, guid);
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m_sessionsStore.inFlight(this.clientID, messageID, guid);
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}
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public IMessagesStore.StoredMessage secondPhaseAcknowledged(int messageID) {
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MessageGUID guid = m_sessionsStore.secondPhaseAcknowledged(clientID, messageID);
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return messagesStore.getMessageByGuid(guid);
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}
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/**
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* Enqueue a message to be sent to the client.
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* @param message the message to enqueue.
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* */
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public void enqueue(IMessagesStore.StoredMessage message) {
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this.m_sessionsStore.queue(this.clientID).add(message);
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}
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public IMessagesStore.StoredMessage storedMessage(int messageID) {
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final MessageGUID guid = m_sessionsStore.mapToGuid(clientID, messageID);
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return messagesStore.getMessageByGuid(guid);
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}
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public void moveInFlightToSecondPhaseAckWaiting(int messageID) {
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m_sessionsStore.moveInFlightToSecondPhaseAckWaiting(this.clientID, messageID);
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}
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public IMessagesStore.StoredMessage getInflightMessage(int messageID) {
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return m_sessionsStore.getInflightMessage(clientID, messageID);
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}
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public Set<Subscription> getSubscriptions() {
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return subscriptions;
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}
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public int getPendingPublishMessagesNo() {
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return m_sessionsStore.getPendingPublishMessagesNo(clientID);
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}
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public int getSecondPhaseAckPendingMessages() {
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return m_sessionsStore.getSecondPhaseAckPendingMessages(clientID);
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}
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public int getInflightMessagesNo() {
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return m_sessionsStore.getInflightMessagesNo(clientID);
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}
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} |