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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.store.memory;
import java.io.IOException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import org.apache.activemq.broker.ConnectionContext;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.Message;
import org.apache.activemq.command.MessageAck;
import org.apache.activemq.command.MessageId;
import org.apache.activemq.command.SubscriptionInfo;
import org.apache.activemq.store.MessageRecoveryListener;
import org.apache.activemq.store.MessageStoreStatistics;
import org.apache.activemq.store.TopicMessageStore;
import org.apache.activemq.util.LRUCache;
import org.apache.activemq.util.SubscriptionKey;
/**
*
*/
public class MemoryTopicMessageStore extends MemoryMessageStore implements TopicMessageStore {
private Map subscriberDatabase;
private Map topicSubMap;
private final Map originalMessageTable;
public MemoryTopicMessageStore(ActiveMQDestination destination) {
this(destination, new MemoryTopicMessageStoreLRUCache(100, 100, 0.75f, false), makeSubscriptionInfoMap());
//Set the messageStoreStatistics after the super class is initialized so that the stats can be
//properly updated on cache eviction
MemoryTopicMessageStoreLRUCache cache = (MemoryTopicMessageStoreLRUCache) originalMessageTable;
cache.setMessageStoreStatistics(messageStoreStatistics);
}
public MemoryTopicMessageStore(ActiveMQDestination destination, Map messageTable, Map subscriberDatabase) {
super(destination, messageTable);
this.subscriberDatabase = subscriberDatabase;
this.topicSubMap = makeSubMap();
//this is only necessary so that messageStoreStatistics can be set if necessary
//We need the original reference since messageTable is wrapped in a synchronized map in the parent class
this.originalMessageTable = messageTable;
}
protected static Map makeSubscriptionInfoMap() {
return Collections.synchronizedMap(new HashMap());
}
protected static Map makeSubMap() {
return Collections.synchronizedMap(new HashMap());
}
@Override
public synchronized void addMessage(ConnectionContext context, Message message) throws IOException {
super.addMessage(context, message);
for (Iterator i = topicSubMap.values().iterator(); i.hasNext();) {
MemoryTopicSub sub = i.next();
sub.addMessage(message.getMessageId(), message);
}
}
@Override
public synchronized void acknowledge(ConnectionContext context, String clientId, String subscriptionName,
MessageId messageId, MessageAck ack) throws IOException {
SubscriptionKey key = new SubscriptionKey(clientId, subscriptionName);
MemoryTopicSub sub = topicSubMap.get(key);
if (sub != null) {
sub.removeMessage(messageId);
}
}
@Override
public synchronized SubscriptionInfo lookupSubscription(String clientId, String subscriptionName) throws IOException {
return subscriberDatabase.get(new SubscriptionKey(clientId, subscriptionName));
}
@Override
public synchronized void addSubscription(SubscriptionInfo info, boolean retroactive) throws IOException {
SubscriptionKey key = new SubscriptionKey(info);
MemoryTopicSub sub = new MemoryTopicSub();
topicSubMap.put(key, sub);
if (retroactive) {
for (Iterator i = messageTable.entrySet().iterator(); i.hasNext();) {
Map.Entry entry = (Entry)i.next();
sub.addMessage((MessageId)entry.getKey(), (Message)entry.getValue());
}
}
subscriberDatabase.put(key, info);
}
@Override
public synchronized void deleteSubscription(String clientId, String subscriptionName) {
org.apache.activemq.util.SubscriptionKey key = new SubscriptionKey(clientId, subscriptionName);
subscriberDatabase.remove(key);
topicSubMap.remove(key);
}
@Override
public synchronized void recoverSubscription(String clientId, String subscriptionName, MessageRecoveryListener listener) throws Exception {
MemoryTopicSub sub = topicSubMap.get(new SubscriptionKey(clientId, subscriptionName));
if (sub != null) {
sub.recoverSubscription(listener);
}
}
@Override
public synchronized void delete() {
super.delete();
subscriberDatabase.clear();
topicSubMap.clear();
}
@Override
public SubscriptionInfo[] getAllSubscriptions() throws IOException {
return subscriberDatabase.values().toArray(new SubscriptionInfo[subscriberDatabase.size()]);
}
@Override
public synchronized int getMessageCount(String clientId, String subscriberName) throws IOException {
int result = 0;
MemoryTopicSub sub = topicSubMap.get(new SubscriptionKey(clientId, subscriberName));
if (sub != null) {
result = sub.size();
}
return result;
}
@Override
public synchronized long getMessageSize(String clientId, String subscriberName) throws IOException {
long result = 0;
MemoryTopicSub sub = topicSubMap.get(new SubscriptionKey(clientId, subscriberName));
if (sub != null) {
result = sub.messageSize();
}
return result;
}
@Override
public synchronized void recoverNextMessages(String clientId, String subscriptionName, int maxReturned, MessageRecoveryListener listener) throws Exception {
MemoryTopicSub sub = this.topicSubMap.get(new SubscriptionKey(clientId, subscriptionName));
if (sub != null) {
sub.recoverNextMessages(maxReturned, listener);
}
}
@Override
public void resetBatching(String clientId, String subscriptionName) {
MemoryTopicSub sub = topicSubMap.get(new SubscriptionKey(clientId, subscriptionName));
if (sub != null) {
sub.resetBatching();
}
}
/**
* Since we initialize the store with a LRUCache in some cases, we need to account for cache evictions
* when computing the message store statistics.
*
*/
private static class MemoryTopicMessageStoreLRUCache extends LRUCache {
private static final long serialVersionUID = -342098639681884413L;
private MessageStoreStatistics messageStoreStatistics;
public MemoryTopicMessageStoreLRUCache(int initialCapacity, int maximumCacheSize,
float loadFactor, boolean accessOrder) {
super(initialCapacity, maximumCacheSize, loadFactor, accessOrder);
}
public void setMessageStoreStatistics(
MessageStoreStatistics messageStoreStatistics) {
this.messageStoreStatistics = messageStoreStatistics;
}
@Override
protected void onCacheEviction(Map.Entry eldest) {
decMessageStoreStatistics(messageStoreStatistics, eldest.getValue());
}
}
}
