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The ActiveMQ Message Broker and Client implementations
/**
* 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;
import javax.jms.JMSException;
import javax.jms.Message;
import org.apache.activemq.broker.region.MessageReference;
import org.apache.activemq.command.MessageId;
import org.apache.activemq.command.ProducerId;
import org.apache.activemq.util.BitArrayBin;
import org.apache.activemq.util.IdGenerator;
import org.apache.activemq.util.LRUCache;
/**
* Provides basic audit functions for Messages
*
* @version $Revision: 1.1.1.1 $
*/
public class ActiveMQMessageAudit {
public static final int DEFAULT_WINDOW_SIZE = 2048;
public static final int MAXIMUM_PRODUCER_COUNT = 64;
private int auditDepth;
private int maximumNumberOfProducersToTrack;
private LRUCache map;
/**
* Default Constructor windowSize = 2048, maximumNumberOfProducersToTrack =
* 64
*/
public ActiveMQMessageAudit() {
this(DEFAULT_WINDOW_SIZE, MAXIMUM_PRODUCER_COUNT);
}
/**
* Construct a MessageAudit
*
* @param auditDepth range of ids to track
* @param maximumNumberOfProducersToTrack number of producers expected in
* the system
*/
public ActiveMQMessageAudit(int auditDepth, final int maximumNumberOfProducersToTrack) {
this.auditDepth = auditDepth;
this.maximumNumberOfProducersToTrack=maximumNumberOfProducersToTrack;
this.map = new LRUCache(0, maximumNumberOfProducersToTrack, 0.75f, true);
}
/**
* @return the auditDepth
*/
public int getAuditDepth() {
return auditDepth;
}
/**
* @param auditDepth the auditDepth to set
*/
public void setAuditDepth(int auditDepth) {
this.auditDepth = auditDepth;
}
/**
* @return the maximumNumberOfProducersToTrack
*/
public int getMaximumNumberOfProducersToTrack() {
return maximumNumberOfProducersToTrack;
}
/**
* @param maximumNumberOfProducersToTrack the maximumNumberOfProducersToTrack to set
*/
public void setMaximumNumberOfProducersToTrack(
int maximumNumberOfProducersToTrack) {
this.maximumNumberOfProducersToTrack = maximumNumberOfProducersToTrack;
this.map.setMaxCacheSize(maximumNumberOfProducersToTrack);
}
/**
* Checks if this message has been seen before
*
* @param message
* @return true if the message is a duplicate
* @throws JMSException
*/
public boolean isDuplicate(Message message) throws JMSException {
return isDuplicate(message.getJMSMessageID());
}
/**
* checks whether this messageId has been seen before and adds this
* messageId to the list
*
* @param id
* @return true if the message is a duplicate
*/
public synchronized boolean isDuplicate(String id) {
boolean answer = false;
String seed = IdGenerator.getSeedFromId(id);
if (seed != null) {
BitArrayBin bab = map.get(seed);
if (bab == null) {
bab = new BitArrayBin(auditDepth);
map.put(seed, bab);
}
long index = IdGenerator.getSequenceFromId(id);
if (index >= 0) {
answer = bab.setBit(index, true);
}
}
return answer;
}
/**
* Checks if this message has been seen before
*
* @param message
* @return true if the message is a duplicate
*/
public boolean isDuplicate(final MessageReference message) {
MessageId id = message.getMessageId();
return isDuplicate(id);
}
/**
* Checks if this messageId has been seen before
*
* @param id
* @return true if the message is a duplicate
*/
public synchronized boolean isDuplicate(final MessageId id) {
boolean answer = false;
if (id != null) {
ProducerId pid = id.getProducerId();
if (pid != null) {
BitArrayBin bab = map.get(pid);
if (bab == null) {
bab = new BitArrayBin(auditDepth);
map.put(pid, bab);
}
answer = bab.setBit(id.getProducerSequenceId(), true);
}
}
return answer;
}
/**
* mark this message as being received
*
* @param message
*/
public void rollback(final MessageReference message) {
MessageId id = message.getMessageId();
rollback(id);
}
/**
* mark this message as being received
*
* @param id
*/
public synchronized void rollback(final MessageId id) {
if (id != null) {
ProducerId pid = id.getProducerId();
if (pid != null) {
BitArrayBin bab = map.get(pid);
if (bab != null) {
bab.setBit(id.getProducerSequenceId(), false);
}
}
}
}
/**
* Check the message is in order
* @param msg
* @return
* @throws JMSException
*/
public boolean isInOrder(Message msg) throws JMSException {
return isInOrder(msg.getJMSMessageID());
}
/**
* Check the message id is in order
* @param id
* @return
*/
public synchronized boolean isInOrder(final String id) {
boolean answer = true;
if (id != null) {
String seed = IdGenerator.getSeedFromId(id);
if (seed != null) {
BitArrayBin bab = map.get(seed);
if (bab != null) {
long index = IdGenerator.getSequenceFromId(id);
answer = bab.isInOrder(index);
}
}
}
return answer;
}
/**
* Check the MessageId is in order
* @param message
* @return
*/
public synchronized boolean isInOrder(final MessageReference message) {
return isInOrder(message.getMessageId());
}
/**
* Check the MessageId is in order
* @param id
* @return
*/
public synchronized boolean isInOrder(final MessageId id) {
boolean answer = false;
if (id != null) {
ProducerId pid = id.getProducerId();
if (pid != null) {
BitArrayBin bab = map.get(pid);
if (bab == null) {
bab = new BitArrayBin(auditDepth);
map.put(pid, bab);
}
answer = bab.isInOrder(id.getProducerSequenceId());
}
}
return answer;
}
}