/**
* 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.server.orm.dao;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import com.google.inject.persist.Transactional;
import org.apache.ambari.server.orm.entities.ViewInstanceDataEntity;
import org.apache.ambari.server.orm.entities.ViewInstanceEntity;
import org.apache.ambari.server.orm.entities.ViewInstanceEntityPK;
import javax.persistence.EntityManager;
import javax.persistence.TypedQuery;
import java.util.List;
/**
* View Instance Data Access Object.
*/
@Singleton
public class ViewInstanceDAO {
/**
* JPA entity manager
*/
@Inject
Provider<EntityManager> entityManagerProvider;
/**
* Find a view with the given names.
*
* @param viewName name of view
* @param instanceName name of the instance
*
* @return a matching view instance or null
*/
public ViewInstanceEntity findByName(String viewName, String instanceName) {
EntityManager entityManager = entityManagerProvider.get();
ViewInstanceEntityPK pk = new ViewInstanceEntityPK();
pk.setViewName(viewName);
pk.setName(instanceName);
return entityManager.find(ViewInstanceEntity.class, pk);
}
/**
* Find all view instances.
*
* @return all views or an empty List
*/
public List<ViewInstanceEntity> findAll() {
TypedQuery<ViewInstanceEntity> query = entityManagerProvider.get().
createNamedQuery("allViewInstances", ViewInstanceEntity.class);
return query.getResultList();
}
/**
* Refresh the state of the instance from the database,
* overwriting changes made to the entity, if any.
*
* @param ViewInstanceEntity entity to refresh
*/
@Transactional
public void refresh(ViewInstanceEntity ViewInstanceEntity) {
entityManagerProvider.get().refresh(ViewInstanceEntity);
}
/**
* Make an instance managed and persistent.
*
* @param ViewInstanceEntity entity to persist
*/
@Transactional
public void create(ViewInstanceEntity ViewInstanceEntity) {
entityManagerProvider.get().persist(ViewInstanceEntity);
}
/**
* Merge the state of the given entity into the current persistence context.
*
* @param ViewInstanceEntity entity to merge
* @return the merged entity
*/
@Transactional
public ViewInstanceEntity merge(ViewInstanceEntity ViewInstanceEntity) {
return entityManagerProvider.get().merge(ViewInstanceEntity);
}
/**
* Remove the entity instance.
*
* @param ViewInstanceEntity entity to remove
*/
@Transactional
public void remove(ViewInstanceEntity ViewInstanceEntity) {
entityManagerProvider.get().remove(merge(ViewInstanceEntity));
}
/**
* Merge the state of the given entity data into the current persistence context.
*
* @param viewInstanceDataEntity entity to merge
* @return the merged entity
*/
@Transactional
public ViewInstanceDataEntity mergeData(ViewInstanceDataEntity viewInstanceDataEntity) {
return entityManagerProvider.get().merge(viewInstanceDataEntity);
}
/**
* Remove the entity instance data.
*
* @param viewInstanceDataEntity entity to remove
*/
@Transactional
public void removeData(ViewInstanceDataEntity viewInstanceDataEntity) {
entityManagerProvider.get().remove(mergeData(viewInstanceDataEntity));
}
}