Spring data mongodb custom auditing with AbstractMongoEventListener

gistfile1.java

import org.joda.time.Instant;
import org.springframework.data.mongodb.core.mapping.event.AbstractMongoEventListener;

public class MongoSynchronizedListener extends AbstractMongoEventListener<Object> {

	/**
	 * Called in MongoTemplate insert, insertList and save operations before the
	 * object is converted to a DBObject using a MongoConveter.
	 */
	@Override
	public void onBeforeConvert(Object obj) {
		if (MongoSynchronized.class.isAssignableFrom(obj.getClass())) {
			MongoSynchronized csys = (MongoSynchronized) obj;
			csys.setRevision(csys.getRevision() != null ? csys.getRevision() + 1l : 0l);
			csys.setModified(Instant.now().getMillis());
			csys.setDeleted(null);
			if (csys.getBirth() == null) {
				csys.setBirth(Instant.now().getMillis());
			}
		}
	}
}