/**
* 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.ambari.view.hive20;
import org.apache.ambari.view.ViewContext;
import org.apache.ambari.view.migration.ViewDataMigrationContext;
import org.apache.ambari.view.migration.ViewDataMigrationException;
import org.apache.ambari.view.migration.ViewDataMigrator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.inject.Inject;
import java.util.HashMap;
import java.util.Map;
/**
* Data migrator that maps persistence entities names
* from Hive 1 to entities of Hive 2.
*/
public class DataMigrator implements ViewDataMigrator {
private final static Logger LOG =
LoggerFactory.getLogger(DataMigrator.class);
/**
* The view context of target migration instance.
*/
@Inject
private ViewContext viewContext;
/**
* The migration context.
*/
@Inject
private ViewDataMigrationContext migrationContext;
private static final Map<String, Class> hive1EntitiesMapping;
static
{
hive1EntitiesMapping = new HashMap<>();
hive1EntitiesMapping.put("org.apache.ambari.view.hive2.resources.jobs.viewJobs.JobImpl",
org.apache.ambari.view.hive20.resources.jobs.viewJobs.JobImpl.class);
hive1EntitiesMapping.put("org.apache.ambari.view.hive2.resources.savedQueries.SavedQuery",
org.apache.ambari.view.hive20.resources.savedQueries.SavedQuery.class);
hive1EntitiesMapping.put("org.apache.ambari.view.hive2.resources.udfs.UDF",
org.apache.ambari.view.hive20.resources.udfs.UDF.class);
hive1EntitiesMapping.put("org.apache.ambari.view.hive2.resources.resources.FileResourceItem",
org.apache.ambari.view.hive20.resources.resources.FileResourceItem.class);
hive1EntitiesMapping.put("org.apache.ambari.view.hive2.TestBean",
org.apache.ambari.view.hive20.TestBean.class);
}
@Override
public boolean beforeMigration() throws ViewDataMigrationException {
return isHive15();
}
@Override
public void afterMigration() throws ViewDataMigrationException {
}
@Override
public void migrateEntity(Class originEntityClass, Class currentEntityClass) throws ViewDataMigrationException {
if (isHive15()) {
currentEntityClass = hive1EntitiesMapping.get(originEntityClass.getCanonicalName());
if (currentEntityClass == null) {
LOG.debug("Mapping was not found for class " + originEntityClass.getCanonicalName());
return;
}
migrationContext.copyAllObjects(originEntityClass, currentEntityClass);
} else {
LOG.warn("Unknown migration policy for class");
}
}
@Override
public void migrateInstanceData() throws ViewDataMigrationException {
migrationContext.copyAllInstanceData();
}
private boolean isHive15() {
return migrationContext.getOriginDataVersion() == 1;
}
}