package org.hivedb.hibernate.simplified;
import org.apache.log4j.Logger;
import org.hibernate.HibernateException;
import org.hibernate.action.Executable;
import org.hibernate.event.PostDeleteEvent;
import org.hibernate.event.PostDeleteEventListener;
import org.hivedb.Hive;
import org.hivedb.HiveLockableException;
import org.hivedb.configuration.EntityConfig;
import org.hivedb.configuration.EntityHiveConfig;
import org.hivedb.hibernate.HiveIndexer;
import org.hivedb.util.classgen.ReflectionTools;
import org.hivedb.util.functional.Transform;
import org.hivedb.util.functional.Unary;
import java.io.Serializable;
/**
* This is an alternative way of deleting the hive indexes after successful
* transaction completion (instead of using a custom Interceptor) and up
* for discussion. Hooked up via org.hibernate.cfg.Configuration.
* getEventListeners().setPostDeleteEventListeners
*
* @author mellwanger
*/
public class PostDeleteEventListenerImpl implements PostDeleteEventListener {
private static final Logger log = Logger.getLogger(PostInsertEventListenerImpl.class);
private final EntityHiveConfig hiveConfig;
private final HiveIndexer indexer;
public PostDeleteEventListenerImpl(EntityHiveConfig hiveConfig, Hive hive) {
this.hiveConfig = hiveConfig;
indexer = new HiveIndexer(hive);
}
public void onPostDelete(final PostDeleteEvent event) {
event.getSession().getActionQueue().execute(new Executable() {
public void afterTransactionCompletion(boolean success) {
if (success) {
deleteIndexes(event.getEntity());
}
}
public void beforeExecutions() throws HibernateException {
// TODO Auto-generated method stub
}
public void execute() throws HibernateException {
// TODO Auto-generated method stub
}
public Serializable[] getPropertySpaces() {
// TODO Auto-generated method stub
return null;
}
public boolean hasAfterTransactionCompletion() {
return true;
}
});
}
@SuppressWarnings("unchecked")
private Class resolveEntityClass(Class clazz) {
return ReflectionTools.whichIsImplemented(
clazz,
Transform.map(new Unary<EntityConfig, Class>() {
public Class f(EntityConfig entityConfig) {
return entityConfig.getRepresentedInterface();
}
},
hiveConfig.getEntityConfigs()));
}
private void deleteIndexes(Object entity) {
try {
final Class<?> resolvedEntityClass = resolveEntityClass(entity.getClass());
if (resolvedEntityClass != null)
indexer.delete(hiveConfig.getEntityConfig(entity.getClass()), entity);
} catch (HiveLockableException e) {
log.warn(e);
}
}
}