org.apache.activemq.broker.region.policy.LastImageSubscriptionRecoveryPolicy Maven / Gradle / Ivy
/**
* 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 result = new ArrayList();
if (lastImage != null) {
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) {
}
}