package com.ctrip.framework.apollo.biz.utils;

 import org.slf4j.Logger;

 import org.slf4j.LoggerFactory;

 import org.springframework.orm.jpa.EntityManagerFactoryAccessor;

 import org.springframework.orm.jpa.EntityManagerFactoryUtils;

 import org.springframework.orm.jpa.EntityManagerHolder;

 import org.springframework.stereotype.Component;

 import org.springframework.transaction.support.TransactionSynchronizationManager;

 /**

  * @author Jason Song(song_s@ctrip.com)

  */

 @Component

 public class EntityManagerUtil extends EntityManagerFactoryAccessor {

   private static final Logger logger = LoggerFactory.getLogger(EntityManagerUtil.class);

   /**

    * close the entity manager.

    * Use it with caution! This is only intended for use with async request, which Spring won't

    * close the entity manager until the async request is finished.

    */

   public void closeEntityManager() {

     EntityManagerHolder emHolder = (EntityManagerHolder)

         TransactionSynchronizationManager.getResource(getEntityManagerFactory());

     if (emHolder == null) {

       return;

     }

     logger.debug("Closing JPA EntityManager in EntityManagerUtil");

     EntityManagerFactoryUtils.closeEntityManager(emHolder.getEntityManager());

   }

 }