/*
    * Copyright 2006-2013 the original author or authors.
    *
    * Licensed 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.springframework.batch.sample.domain.trade.internal;
  
  import java.util.List;
  
  import org.hibernate.SessionFactory;
  import org.springframework.batch.item.ItemWriter;
  import org.springframework.batch.sample.domain.trade.CustomerCredit;
  import org.springframework.batch.sample.domain.trade.CustomerCreditDao;
  import org.springframework.beans.factory.InitializingBean;
  import org.springframework.util.Assert;
  
  /**
   * Delegates writing to a custom DAO and flushes + clears hibernate session to
   * fulfill the {@link ItemWriter} contract.
   *
   * @author Robert Kasanicky
   * @author Michael Minella
   */
  public class HibernateAwareCustomerCreditItemWriter implements ItemWriter<CustomerCredit>, InitializingBean {
  
  	private CustomerCreditDao dao;
  
  	private SessionFactory sessionFactory;
  
  	public void write(List<? extends CustomerCredit> items) throws Exception {
  		for (CustomerCredit credit : items) {
  			dao.writeCredit(credit);
  		}
  		try {
  			sessionFactory.getCurrentSession().flush();
  		}
  		finally {
  			// this should happen automatically on commit, but to be on the safe
  			// side...
  			sessionFactory.getCurrentSession().clear();
  		}
  
  	}
  
  	public void setDao(CustomerCreditDao dao) {
  		this.dao = dao;
  	}
  
  	public void setSessionFactory(SessionFactory sessionFactory) {
  		this.sessionFactory = sessionFactory;
  	}
  
  	public void afterPropertiesSet() throws Exception {
  		Assert.state(sessionFactory != null, "Hibernate SessionFactory is required");
  		Assert.notNull(dao, "Delegate DAO must be set");
  	}
  
  }