| /** |
| * 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.Iterator; |
| import java.util.LinkedHashMap; |
| 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.store.MessageRecoveryListener; |
| import org.apache.activemq.store.MessageStore; |
| import org.apache.activemq.store.AbstractMessageStore; |
| import org.apache.activemq.usage.MemoryUsage; |
| import org.apache.activemq.usage.SystemUsage; |
| |
| /** |
| * An implementation of {@link org.apache.activemq.store.MessageStore} which |
| * uses a |
| * |
| * |
| */ |
| public class MemoryMessageStore extends AbstractMessageStore { |
| |
| protected final Map<MessageId, Message> messageTable; |
| protected MessageId lastBatchId; |
| |
| public MemoryMessageStore(ActiveMQDestination destination) { |
| this(destination, new LinkedHashMap<MessageId, Message>()); |
| } |
| |
| public MemoryMessageStore(ActiveMQDestination destination, Map<MessageId, Message> messageTable) { |
| super(destination); |
| this.messageTable = Collections.synchronizedMap(messageTable); |
| } |
| |
| public synchronized void addMessage(ConnectionContext context, Message message) throws IOException { |
| synchronized (messageTable) { |
| messageTable.put(message.getMessageId(), message); |
| } |
| message.incrementReferenceCount(); |
| } |
| |
| // public void addMessageReference(ConnectionContext context,MessageId |
| // messageId,long expirationTime,String messageRef) |
| // throws IOException{ |
| // synchronized(messageTable){ |
| // messageTable.put(messageId,messageRef); |
| // } |
| // } |
| |
| public Message getMessage(MessageId identity) throws IOException { |
| return messageTable.get(identity); |
| } |
| |
| // public String getMessageReference(MessageId identity) throws IOException{ |
| // return (String)messageTable.get(identity); |
| // } |
| |
| public void removeMessage(ConnectionContext context, MessageAck ack) throws IOException { |
| removeMessage(ack.getLastMessageId()); |
| } |
| |
| public void removeMessage(MessageId msgId) throws IOException { |
| synchronized (messageTable) { |
| Message removed = messageTable.remove(msgId); |
| if( removed !=null ) { |
| removed.decrementReferenceCount(); |
| } |
| if ((lastBatchId != null && lastBatchId.equals(msgId)) || messageTable.isEmpty()) { |
| lastBatchId = null; |
| } |
| } |
| } |
| |
| public void recover(MessageRecoveryListener listener) throws Exception { |
| // the message table is a synchronizedMap - so just have to synchronize |
| // here |
| synchronized (messageTable) { |
| for (Iterator<Message> iter = messageTable.values().iterator(); iter.hasNext();) { |
| Object msg = iter.next(); |
| if (msg.getClass() == MessageId.class) { |
| listener.recoverMessageReference((MessageId)msg); |
| } else { |
| listener.recoverMessage((Message)msg); |
| } |
| } |
| } |
| } |
| |
| public void removeAllMessages(ConnectionContext context) throws IOException { |
| synchronized (messageTable) { |
| messageTable.clear(); |
| } |
| } |
| |
| public void delete() { |
| synchronized (messageTable) { |
| messageTable.clear(); |
| } |
| } |
| |
| |
| public int getMessageCount() { |
| return messageTable.size(); |
| } |
| |
| public void recoverNextMessages(int maxReturned, MessageRecoveryListener listener) throws Exception { |
| synchronized (messageTable) { |
| boolean pastLackBatch = lastBatchId == null; |
| int count = 0; |
| for (Iterator iter = messageTable.entrySet().iterator(); iter.hasNext();) { |
| Map.Entry entry = (Entry)iter.next(); |
| if (pastLackBatch) { |
| count++; |
| Object msg = entry.getValue(); |
| lastBatchId = (MessageId)entry.getKey(); |
| if (msg.getClass() == MessageId.class) { |
| listener.recoverMessageReference((MessageId)msg); |
| } else { |
| listener.recoverMessage((Message)msg); |
| } |
| } else { |
| pastLackBatch = entry.getKey().equals(lastBatchId); |
| } |
| } |
| } |
| } |
| |
| public void resetBatching() { |
| lastBatchId = null; |
| } |
| |
| @Override |
| public void setBatch(MessageId messageId) { |
| lastBatchId = messageId; |
| } |
| |
| } |