content: /*
   * 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 java.util.Collections;
  import java.util.List;
  
  import jakarta.persistence.EntityManager;
  import jakarta.persistence.NoResultException;
  import jakarta.persistence.TypedQuery;
  
  import org.apache.ambari.server.orm.RequiresSession;
  import org.apache.ambari.server.orm.entities.HostEntity;
  import org.apache.ambari.server.orm.entities.TopologyHostInfoEntity;
  
  import com.google.inject.Inject;
  import com.google.inject.Provider;
  import com.google.inject.Singleton;
  import com.google.inject.persist.Transactional;
  
  @Singleton
  public class TopologyHostInfoDAO {
  
    @Inject
    Provider<EntityManager> entityManagerProvider;
  
    /**
     * Looks for TopologyHostInfo by ID
     * @param hostInfoId ID of topology host info
     * @return Found entity or NULL
     */
    @RequiresSession
    public TopologyHostInfoEntity findById(long hostInfoId) {
      return entityManagerProvider.get().find(TopologyHostInfoEntity.class, hostInfoId);
    }
  
    @RequiresSession
    public List<TopologyHostInfoEntity> findByHost(HostEntity host) {
      TypedQuery<TopologyHostInfoEntity> query = entityManagerProvider.get().createQuery(
          "SELECT hostInfo FROM TopologyHostInfoEntity hostInfo where hostInfo.hostEntity=:host", TopologyHostInfoEntity.class);
      query.setParameter("host", host);
      try {
        return query.getResultList();
      } catch (NoResultException ignored) {
        return null;
      }
    }
  
    @RequiresSession
    public List<TopologyHostInfoEntity> findAll() {
      TypedQuery<TopologyHostInfoEntity> query = entityManagerProvider.get().createQuery("SELECT hostInfo FROM TopologyHostInfoEntity hostInfo", TopologyHostInfoEntity.class);
      try {
        return query.getResultList();
      } catch (NoResultException e) {
        return Collections.emptyList();
      }
    }
  
    /**
     * Refreshes entity state from database
     * @param topologyHostInfoEntity entity to refresh
     */
    @Transactional
    public void refresh(TopologyHostInfoEntity topologyHostInfoEntity) {
      entityManagerProvider.get().refresh(topologyHostInfoEntity);
    }
  
    @Transactional
    public void create(TopologyHostInfoEntity topologyHostInfoEntity) {
      entityManagerProvider.get().persist(topologyHostInfoEntity);
    }
  
    @Transactional
    public TopologyHostInfoEntity merge(TopologyHostInfoEntity topologyHostInfoEntity) {
      return entityManagerProvider.get().merge(topologyHostInfoEntity);
    }
  
    @Transactional
    public void remove(TopologyHostInfoEntity topologyHostInfoEntity) {
      entityManagerProvider.get().remove(merge(topologyHostInfoEntity));
    }
  
    @Transactional
    public void removeByHost(HostEntity host) {
      for(TopologyHostInfoEntity e : findByHost(host)) {
        entityManagerProvider.get().remove(merge(e));
      }
    }
  
    public TopologyHostInfoEntity findByHostname(String hostName) {
      TypedQuery<TopologyHostInfoEntity> query = entityManagerProvider.get().createQuery(
        "SELECT hostInfo FROM TopologyHostInfoEntity hostInfo where hostInfo.fqdn=:hostName", TopologyHostInfoEntity.class);
      query.setParameter("hostName", hostName);
      try {
        return query.getSingleResult();
      } catch (NoResultException ignored) {
        return null;
      }
    }
  }
  