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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.stomp;
import java.io.IOException;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.Map;
import javax.jms.JMSException;
import org.apache.activemq.command.ActiveMQBytesMessage;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.ActiveMQMessage;
import org.apache.activemq.command.ConsumerInfo;
import org.apache.activemq.command.MessageAck;
import org.apache.activemq.command.MessageDispatch;
import org.apache.activemq.command.MessageId;
import org.apache.activemq.command.TransactionId;
import org.apache.activemq.util.IdGenerator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Keeps track of the STOMP subscription so that acking is correctly done.
*
* @author chirino
*/
public class StompSubscription {
private static final Logger LOG = LoggerFactory.getLogger(StompSubscription.class);
private static final IdGenerator ACK_ID_GENERATOR = new IdGenerator();
public static final String AUTO_ACK = Stomp.Headers.Subscribe.AckModeValues.AUTO;
public static final String CLIENT_ACK = Stomp.Headers.Subscribe.AckModeValues.CLIENT;
public static final String INDIVIDUAL_ACK = Stomp.Headers.Subscribe.AckModeValues.INDIVIDUAL;
protected final ProtocolConverter protocolConverter;
protected final String subscriptionId;
protected final ConsumerInfo consumerInfo;
protected final Map dispatchedMessage = new LinkedHashMap<>();
protected final Map pendingAcks; // STOMP v1.2 requires ACK ID tracking
protected final LinkedList transactedMessages = new LinkedList<>();
protected String ackMode = AUTO_ACK;
protected ActiveMQDestination destination;
protected String transformation;
public StompSubscription(ProtocolConverter stompTransport, String subscriptionId, ConsumerInfo consumerInfo, String transformation, Map pendingAcks) {
this.protocolConverter = stompTransport;
this.subscriptionId = subscriptionId;
this.consumerInfo = consumerInfo;
this.transformation = transformation;
this.pendingAcks = pendingAcks;
}
void onMessageDispatch(MessageDispatch md) throws IOException, JMSException {
ActiveMQMessage message = (ActiveMQMessage)md.getMessage();
String ackId = null;
if (isClientAck() || isIndividualAck()) {
ackId = ACK_ID_GENERATOR.generateId();
StompAckEntry pendingAck = new StompAckEntry(md, ackId, this);
synchronized (this) {
dispatchedMessage.put(message.getMessageId(), pendingAck);
}
if (protocolConverter.isStomp12()) {
this.pendingAcks.put(ackId, pendingAck);
}
} else if (isAutoAck()) {
MessageAck ack = new MessageAck(md, MessageAck.STANDARD_ACK_TYPE, 1);
protocolConverter.getStompTransport().sendToActiveMQ(ack);
}
boolean ignoreTransformation = false;
if (transformation != null && !( message instanceof ActiveMQBytesMessage ) ) {
message.setReadOnlyProperties(false);
message.setStringProperty(Stomp.Headers.TRANSFORMATION, transformation);
} else {
if (message.getStringProperty(Stomp.Headers.TRANSFORMATION) != null) {
ignoreTransformation = true;
}
}
StompFrame command = protocolConverter.convertMessage(message, ignoreTransformation);
command.setAction(Stomp.Responses.MESSAGE);
if (subscriptionId != null) {
command.getHeaders().put(Stomp.Headers.Message.SUBSCRIPTION, subscriptionId);
}
if (protocolConverter.isStomp12() && ackId != null) {
command.getHeaders().put(Stomp.Headers.Message.ACK_ID, ackId);
}
try {
protocolConverter.getStompTransport().sendToStomp(command);
} catch (IOException ex) {
if (ackId != null) {
pendingAcks.remove(ackId);
}
throw ex;
}
}
synchronized void onStompAbort(TransactionId transactionId) {
// Restore the pending ACKs so that their ACK IDs are again valid for a client
// to operate on.
LOG.trace("Transaction Abort restoring {} pending ACKs to valid state.", transactedMessages.size());
for (StompAckEntry ackEntry : transactedMessages) {
if (protocolConverter.isStomp12()) {
pendingAcks.put(ackEntry.getAckId(), ackEntry);
}
}
transactedMessages.clear();
}
void onStompCommit(TransactionId transactionId) {
MessageAck ack = null;
synchronized (this) {
for (Iterator iterator = dispatchedMessage.values().iterator(); iterator.hasNext();) {
StompAckEntry ackEntry = iterator.next();
if (transactedMessages.contains(ackEntry)) {
iterator.remove();
}
}
// For individual Ack we already sent an Ack that will be applied on commit
// we don't send a second standard Ack as that would produce an error.
if (!transactedMessages.isEmpty() && isClientAck()) {
ack = new MessageAck(transactedMessages.getLast().getMessageDispatch(), MessageAck.STANDARD_ACK_TYPE, transactedMessages.size());
ack.setTransactionId(transactionId);
transactedMessages.clear();
}
}
// avoid contention with onMessageDispatch
if (ack != null) {
protocolConverter.getStompTransport().sendToActiveMQ(ack);
}
}
synchronized MessageAck onStompMessageAck(String messageId, TransactionId transactionId) {
MessageId msgId = new MessageId(messageId);
final StompAckEntry ackEntry = dispatchedMessage.get(msgId);
if (ackEntry == null) {
return null;
}
MessageAck ack = new MessageAck();
ack.setDestination(consumerInfo.getDestination());
ack.setConsumerId(consumerInfo.getConsumerId());
if (isClientAck()) {
if (transactionId == null) {
ack.setAckType(MessageAck.STANDARD_ACK_TYPE);
} else {
ack.setAckType(MessageAck.DELIVERED_ACK_TYPE);
}
int count = 0;
for (Iterator iterator = dispatchedMessage.values().iterator(); iterator.hasNext();) {
StompAckEntry entry = iterator.next();
MessageId current = entry.getMessageId();
if (entry.getAckId() != null) {
pendingAcks.remove(entry.getAckId());
}
if (transactionId != null) {
if (!transactedMessages.contains(entry)) {
transactedMessages.add(entry);
count++;
}
} else {
iterator.remove();
count++;
}
if (current.equals(msgId)) {
ack.setLastMessageId(current);
break;
}
}
ack.setMessageCount(count);
if (transactionId != null) {
ack.setTransactionId(transactionId);
}
} else if (isIndividualAck()) {
if (ackEntry.getAckId() != null) {
pendingAcks.remove(ackEntry.getAckId());
}
ack.setAckType(MessageAck.INDIVIDUAL_ACK_TYPE);
ack.setMessageID(msgId);
ack.setMessageCount(1);
if (transactionId != null) {
transactedMessages.add(dispatchedMessage.get(msgId));
ack.setTransactionId(transactionId);
} else {
dispatchedMessage.remove(msgId);
}
}
return ack;
}
public MessageAck onStompMessageNack(String messageId, TransactionId transactionId) throws ProtocolException {
MessageId msgId = new MessageId(messageId);
if (!dispatchedMessage.containsKey(msgId)) {
return null;
}
final StompAckEntry ackEntry = dispatchedMessage.get(msgId);
if (ackEntry.getAckId() != null) {
pendingAcks.remove(ackEntry.getAckId());
}
MessageAck ack = new MessageAck();
ack.setDestination(consumerInfo.getDestination());
ack.setConsumerId(consumerInfo.getConsumerId());
ack.setAckType(MessageAck.POISON_ACK_TYPE);
ack.setMessageID(msgId);
if (transactionId != null) {
transactedMessages.add(ackEntry);
ack.setTransactionId(transactionId);
} else {
dispatchedMessage.remove(msgId);
}
return ack;
}
public String getAckMode() {
return ackMode;
}
public void setAckMode(String ackMode) {
this.ackMode = ackMode;
}
public boolean isAutoAck() {
return ackMode.equals(AUTO_ACK);
}
public boolean isClientAck() {
return ackMode.equals(CLIENT_ACK);
}
public boolean isIndividualAck() {
return ackMode.equals(INDIVIDUAL_ACK);
}
public String getSubscriptionId() {
return subscriptionId;
}
public void setDestination(ActiveMQDestination destination) {
this.destination = destination;
}
public ActiveMQDestination getDestination() {
return destination;
}
public ConsumerInfo getConsumerInfo() {
return consumerInfo;
}
}
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