| /** |
| * 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.util.Iterator; |
| import java.util.LinkedHashMap; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| import org.apache.activemq.command.Message; |
| import org.apache.activemq.command.MessageId; |
| import org.apache.activemq.store.MessageRecoveryListener; |
| |
| /** |
| * A holder for a durable subscriber |
| * |
| * |
| */ |
| class MemoryTopicSub { |
| |
| private Map<MessageId, Message> map = new LinkedHashMap<MessageId, Message>(); |
| private MessageId lastBatch; |
| |
| void addMessage(MessageId id, Message message) { |
| synchronized(this) { |
| map.put(id, message); |
| } |
| message.incrementReferenceCount(); |
| } |
| |
| void removeMessage(MessageId id) { |
| Message removed; |
| synchronized(this) { |
| removed = map.remove(id); |
| if ((lastBatch != null && lastBatch.equals(id)) || map.isEmpty()) { |
| resetBatching(); |
| } |
| } |
| if( removed!=null ) { |
| removed.decrementReferenceCount(); |
| } |
| } |
| |
| synchronized int size() { |
| return map.size(); |
| } |
| |
| synchronized void recoverSubscription(MessageRecoveryListener listener) throws Exception { |
| for (Iterator iter = map.entrySet().iterator(); iter.hasNext();) { |
| Map.Entry entry = (Entry)iter.next(); |
| Object msg = entry.getValue(); |
| if (msg.getClass() == MessageId.class) { |
| listener.recoverMessageReference((MessageId)msg); |
| } else { |
| listener.recoverMessage((Message)msg); |
| } |
| } |
| } |
| |
| synchronized void recoverNextMessages(int maxReturned, MessageRecoveryListener listener) throws Exception { |
| boolean pastLackBatch = lastBatch == null; |
| MessageId lastId = null; |
| // the message table is a synchronizedMap - so just have to synchronize |
| // here |
| int count = 0; |
| for (Iterator iter = map.entrySet().iterator(); iter.hasNext() && count < maxReturned;) { |
| Map.Entry entry = (Entry)iter.next(); |
| if (pastLackBatch) { |
| count++; |
| Object msg = entry.getValue(); |
| lastId = (MessageId)entry.getKey(); |
| if (msg.getClass() == MessageId.class) { |
| listener.recoverMessageReference((MessageId)msg); |
| } else { |
| listener.recoverMessage((Message)msg); |
| } |
| } else { |
| pastLackBatch = entry.getKey().equals(lastBatch); |
| } |
| } |
| if (lastId != null) { |
| lastBatch = lastId; |
| } |
| |
| } |
| |
| synchronized void resetBatching() { |
| lastBatch = null; |
| } |
| } |