| /** |
| * 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.memory.list; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import org.apache.activemq.broker.region.MessageReference; |
| import org.apache.activemq.broker.region.Subscription; |
| import org.apache.activemq.command.ActiveMQDestination; |
| import org.apache.activemq.command.ActiveMQMessage; |
| import org.apache.activemq.command.Message; |
| import org.apache.activemq.filter.DestinationMap; |
| import org.apache.activemq.memory.buffer.MessageBuffer; |
| import org.apache.activemq.memory.buffer.MessageQueue; |
| import org.apache.activemq.memory.buffer.OrderBasedMessageBuffer; |
| |
| /** |
| * An implementation of {@link MessageList} which maintains a separate message |
| * list for each destination to reduce contention on the list and to speed up |
| * recovery times by only recovering the interested topics. |
| * |
| * |
| */ |
| public class DestinationBasedMessageList implements MessageList { |
| |
| private MessageBuffer messageBuffer; |
| private Map<ActiveMQDestination, MessageQueue> queueIndex = new HashMap<ActiveMQDestination, MessageQueue>(); |
| private DestinationMap subscriptionIndex = new DestinationMap(); |
| private Object lock = new Object(); |
| |
| public DestinationBasedMessageList(int maximumSize) { |
| this(new OrderBasedMessageBuffer(maximumSize)); |
| } |
| |
| public DestinationBasedMessageList(MessageBuffer buffer) { |
| messageBuffer = buffer; |
| } |
| |
| public void add(MessageReference node) { |
| ActiveMQMessage message = (ActiveMQMessage) node.getMessageHardRef(); |
| ActiveMQDestination destination = message.getDestination(); |
| MessageQueue queue = null; |
| synchronized (lock) { |
| queue = queueIndex.get(destination); |
| if (queue == null) { |
| queue = messageBuffer.createMessageQueue(); |
| queueIndex.put(destination, queue); |
| subscriptionIndex.put(destination, queue); |
| } |
| } |
| queue.add(node); |
| } |
| |
| public List<MessageReference> getMessages(Subscription sub) { |
| return getMessages(sub.getConsumerInfo().getDestination()); |
| } |
| |
| public List<MessageReference> getMessages(ActiveMQDestination destination) { |
| Set set = null; |
| synchronized (lock) { |
| set = subscriptionIndex.get(destination); |
| } |
| List<MessageReference> answer = new ArrayList<MessageReference>(); |
| for (Iterator iter = set.iterator(); iter.hasNext();) { |
| MessageQueue queue = (MessageQueue) iter.next(); |
| queue.appendMessages(answer); |
| } |
| return answer; |
| } |
| |
| public Message[] browse(ActiveMQDestination destination) { |
| List<MessageReference> result = getMessages(destination); |
| return result.toArray(new Message[result.size()]); |
| } |
| |
| |
| public void clear() { |
| messageBuffer.clear(); |
| } |
| } |