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  /*
   * Copyright 2006-2007 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.item.database;
 
 import java.util.List;
 
org.springframework.batch.item.ItemWriter that uses a Hibernate session to save or update entities that are not part of the current Hibernate session. It will also flush and clear the session at chunk boundaries.

The writer is thread safe after its properties are set (normal singleton behavior), so it can be used to write in multiple concurrent transactions.

Author(s):
Dave Syer
Thomas Risberg
 
 public class HibernateItemWriter<T> implements ItemWriter<T>, InitializingBean {
 
 	protected static final Log logger = LogFactory.getLog(HibernateItemWriter.class);
 
Public setter for the org.springframework.orm.hibernate3.HibernateOperations property.

Parameters:
hibernateTemplate the hibernateTemplate to set
 
 	public void setHibernateTemplate(HibernateOperations hibernateTemplate) {
 		this. = hibernateTemplate;
 	}

Set the Hibernate SessionFactory to be used internally. Will automatically create a HibernateTemplate for the given SessionFactory.

 
 	public final void setSessionFactory(SessionFactory sessionFactory) {
 		this. = new HibernateTemplate(sessionFactory);
 	}

Check mandatory properties - there must be a hibernateTemplate.
 
 	public void afterPropertiesSet() {
 		Assert.notNull("HibernateItemWriter requires a HibernateOperations");
 	}

Save or update any entities not in the current hibernate session and then flush and clear the hibernate session.

 
 	public final void write(List<? extends T> items) {
 		try {
 		}
 		finally {
 			// This should happen when the transaction commits anyway, but to be
 			// sure...
 		}
 	}

Do perform the actual write operation. This can be overridden in a subclass if necessary.

Parameters:
hibernateTemplate the HibernateTemplate to use for the operation
items the list of items to use for the write
 
 	protected void doWrite(HibernateOperations hibernateTemplateList<? extends T> items) {
 
 		if (.isDebugEnabled()) {
			.debug("Writing to Hibernate with " + items.size() + " items.");
		}
		if (!items.isEmpty()) {
			long saveOrUpdateCount = 0;
			for (T item : items) {
				if (!hibernateTemplate.contains(item)) {
					hibernateTemplate.saveOrUpdate(item);
					saveOrUpdateCount++;
				}
			}
				.debug(saveOrUpdateCount + " entities saved/updated.");
				.debug((items.size() - saveOrUpdateCount) + " entities found in session.");
			}
		}
	}
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