activemq-kahadb-exporter/src/main/java/org/apache/activemq/cli/kahadb/exporter/KahaDBExporter.java

/**
 * 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.cli.kahadb.exporter;

import java.io.IOException;
import java.util.Set;
import java.util.stream.Collectors;

import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.command.ActiveMQTopic;
import org.apache.activemq.store.MessageRecoveryListener;
import org.apache.activemq.store.MessageStore;
import org.apache.activemq.store.kahadb.KahaDBPersistenceAdapter;
import org.apache.activemq.util.IOExceptionSupport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class KahaDBExporter implements MessageStoreExporter {

    static final Logger LOG = LoggerFactory.getLogger(KahaDBExporter.class);

    private final KahaDBPersistenceAdapter adapter;
    private final MessageStoreMetadataExporter metadataExporter;
    private final MessageRecoveryListener recoveryListener;

    public KahaDBExporter(final KahaDBPersistenceAdapter adapter,
            final MessageStoreMetadataExporter metadataExporter,
            final MessageRecoveryListener recoveryListener) {
        this.adapter = adapter;
        this.metadataExporter = metadataExporter;
        this.recoveryListener = recoveryListener;
    }


    @Override
    public void exportMetadata() throws IOException {
        metadataExporter.export();
    }

    @Override
    public void exportQueues() throws IOException {
        exportDestinations(ActiveMQDestination.QUEUE_TYPE);
    }

    @Override
    public void exportTopics() throws IOException {
        exportDestinations(ActiveMQDestination.TOPIC_TYPE);
    }

    private void exportDestinations(byte destType) throws IOException {
        final Set<ActiveMQDestination> destinations = adapter.getDestinations().stream().filter(
                dest -> dest.getDestinationType() == destType).collect(Collectors.toSet());

        // loop through all queues and export them
        for (final ActiveMQDestination destination : destinations) {

            LOG.info("Starting export of: " + destination);
            final MessageStore messageStore = destination.isQueue() ?
                    adapter.createQueueMessageStore((ActiveMQQueue) destination) :
                    adapter.createTopicMessageStore((ActiveMQTopic) destination);

            try {
                // migrate the data
                messageStore.recover(recoveryListener);
            } catch (Exception e) {
                IOExceptionSupport.create(e);
            }
        }
    }

}