| /** |
| * 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.broker.region.policy; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import org.apache.activemq.broker.Broker; |
| import org.apache.activemq.broker.ConnectionContext; |
| import org.apache.activemq.broker.region.MessageReference; |
| import org.apache.activemq.broker.region.SubscriptionRecovery; |
| import org.apache.activemq.broker.region.Topic; |
| import org.apache.activemq.command.ActiveMQDestination; |
| import org.apache.activemq.command.Message; |
| import org.apache.activemq.filter.DestinationFilter; |
| |
| /** |
| * This implementation of {@link SubscriptionRecoveryPolicy} will only keep the |
| * last message. |
| * |
| * @org.apache.xbean.XBean |
| * |
| */ |
| public class LastImageSubscriptionRecoveryPolicy implements SubscriptionRecoveryPolicy { |
| |
| private volatile MessageReference lastImage; |
| |
| public boolean add(ConnectionContext context, MessageReference node) throws Exception { |
| lastImage = node; |
| return true; |
| } |
| |
| public void recover(ConnectionContext context, Topic topic, SubscriptionRecovery sub) throws Exception { |
| // Re-dispatch the last message seen. |
| MessageReference node = lastImage; |
| if (node != null) { |
| sub.addRecoveredMessage(context, node); |
| } |
| } |
| |
| public void start() throws Exception { |
| } |
| |
| public void stop() throws Exception { |
| } |
| |
| public Message[] browse(ActiveMQDestination destination) throws Exception { |
| List<Message> result = new ArrayList<Message>(); |
| DestinationFilter filter = DestinationFilter.parseFilter(destination); |
| if (filter.matches(lastImage.getMessage().getDestination())) { |
| result.add(lastImage.getMessage()); |
| } |
| return result.toArray(new Message[result.size()]); |
| } |
| |
| public SubscriptionRecoveryPolicy copy() { |
| return new LastImageSubscriptionRecoveryPolicy(); |
| } |
| |
| public void setBroker(Broker broker) { |
| } |
| |
| } |