| /** |
| * 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.kahadaptor; |
| |
| import java.io.IOException; |
| 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.kaha.MapContainer; |
| import org.apache.activemq.kaha.StoreEntry; |
| 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 JPS Container |
| * |
| * |
| */ |
| public class KahaMessageStore extends AbstractMessageStore { |
| |
| protected final MapContainer<MessageId, Message> messageContainer; |
| protected StoreEntry batchEntry; |
| |
| public KahaMessageStore(MapContainer<MessageId, Message> container, ActiveMQDestination destination) |
| throws IOException { |
| super(destination); |
| this.messageContainer = container; |
| } |
| |
| protected MessageId getMessageId(Object object) { |
| return ((Message)object).getMessageId(); |
| } |
| |
| public Object getId() { |
| return messageContainer.getId(); |
| } |
| |
| public synchronized void addMessage(ConnectionContext context, Message message) throws IOException { |
| messageContainer.put(message.getMessageId(), message); |
| // TODO: we should do the following but it is not need if the message is |
| // being added within a persistence |
| // transaction |
| // but since I can't tell if one is running right now.. I'll leave this |
| // out for now. |
| // if( message.isResponseRequired() ) { |
| // messageContainer.force(); |
| // } |
| } |
| |
| public synchronized Message getMessage(MessageId identity) throws IOException { |
| Message result = messageContainer.get(identity); |
| return result; |
| } |
| |
| protected boolean recoverMessage(MessageRecoveryListener listener, Message msg) throws Exception { |
| listener.recoverMessage(msg); |
| return listener.hasSpace(); |
| } |
| |
| public void removeMessage(ConnectionContext context, MessageAck ack) throws IOException { |
| removeMessage(ack.getLastMessageId()); |
| } |
| |
| public synchronized void removeMessage(MessageId msgId) throws IOException { |
| StoreEntry entry = messageContainer.getEntry(msgId); |
| if (entry != null) { |
| messageContainer.remove(entry); |
| if (messageContainer.isEmpty() || (batchEntry != null && batchEntry.equals(entry))) { |
| resetBatching(); |
| } |
| } |
| } |
| |
| public synchronized void recover(MessageRecoveryListener listener) throws Exception { |
| for (StoreEntry entry = messageContainer.getFirst(); entry != null; entry = messageContainer |
| .getNext(entry)) { |
| Message msg = (Message)messageContainer.getValue(entry); |
| if (!recoverMessage(listener, msg)) { |
| break; |
| } |
| } |
| } |
| |
| public synchronized void removeAllMessages(ConnectionContext context) throws IOException { |
| messageContainer.clear(); |
| } |
| |
| public synchronized void delete() { |
| messageContainer.clear(); |
| } |
| |
| /** |
| * @return the number of messages held by this destination |
| * @see org.apache.activemq.store.MessageStore#getMessageCount() |
| */ |
| public int getMessageCount() { |
| return messageContainer.size(); |
| } |
| |
| /** |
| * @param id |
| * @return null |
| * @throws Exception |
| * @see org.apache.activemq.store.MessageStore#getPreviousMessageIdToDeliver(org.apache.activemq.command.MessageId) |
| */ |
| public MessageId getPreviousMessageIdToDeliver(MessageId id) throws Exception { |
| return null; |
| } |
| |
| /** |
| * @param lastMessageId |
| * @param maxReturned |
| * @param listener |
| * @throws Exception |
| * @see org.apache.activemq.store.MessageStore#recoverNextMessages(org.apache.activemq.command.MessageId, |
| * int, org.apache.activemq.store.MessageRecoveryListener) |
| */ |
| public synchronized void recoverNextMessages(int maxReturned, MessageRecoveryListener listener) |
| throws Exception { |
| StoreEntry entry = batchEntry; |
| if (entry == null) { |
| entry = messageContainer.getFirst(); |
| } else { |
| entry = messageContainer.refresh(entry); |
| entry = messageContainer.getNext(entry); |
| if (entry == null) { |
| batchEntry = null; |
| } |
| } |
| if (entry != null) { |
| int count = 0; |
| do { |
| Message msg = messageContainer.getValue(entry); |
| if (msg != null) { |
| recoverMessage(listener, msg); |
| count++; |
| } |
| batchEntry = entry; |
| entry = messageContainer.getNext(entry); |
| } while (entry != null && count < maxReturned && listener.hasSpace()); |
| } |
| } |
| |
| /** |
| * @param nextToDispatch |
| * @see org.apache.activemq.store.MessageStore#resetBatching(org.apache.activemq.command.MessageId) |
| */ |
| public synchronized void resetBatching() { |
| batchEntry = null; |
| } |
| |
| /** |
| * @return true if the store supports cursors |
| */ |
| public boolean isSupportForCursors() { |
| return true; |
| } |
| |
| @Override |
| public void setBatch(MessageId messageId) { |
| batchEntry = messageContainer.getEntry(messageId); |
| } |
| |
| } |