/*
* JBoss, Home of Professional Open Source.
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.ejb.plugins.cmp.jdbc;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.util.Map;
import java.rmi.RemoteException;
import javax.ejb.RemoveException;
import org.jboss.ejb.EntityEnterpriseContext;
import org.jboss.ejb.EntityContainer;
import org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCCMRFieldBridge;
import org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCEntityBridge;
import org.jboss.logging.Logger;
import org.jboss.metadata.ConfigurationMetaData;
import org.jboss.deployment.DeploymentException;
/**
* JDBCRemoveEntityCommand executes a DELETE FROM table WHERE command.
*
* @author <a href="mailto:dain@daingroup.com">Dain Sundstrom</a>
* @author <a href="mailto:rickard.oberg@telkel.com">Rickard Oberg</a>
* @author <a href="mailto:marc.fleury@telkel.com">Marc Fleury</a>
* @author <a href="mailto:shevlandj@kpi.com.au">Joe Shevland</a>
* @author <a href="mailto:justin@j-m-f.demon.co.uk">Justin Forder</a>
* @author <a href="mailto:alex@jboss.org">Alexey Loubyansky</a>
* @version $Revision: 81030 $
*/
public final class JDBCRemoveEntityCommand
{
private final JDBCStoreManager manager;
private final JDBCEntityBridge entity;
private final Logger log;
private final String removeEntitySQL;
private final boolean syncOnCommitOnly;
private boolean batchCascadeDelete;
public JDBCRemoveEntityCommand(JDBCStoreManager manager)
throws DeploymentException
{
this.manager = manager;
entity = (JDBCEntityBridge) manager.getEntityBridge();
// Create the Log
log = Logger.getLogger(
this.getClass().getName() +
"." +
manager.getMetaData().getName());
StringBuffer sql = new StringBuffer();
sql.append(SQLUtil.DELETE_FROM)
.append(entity.getQualifiedTableName())
.append(SQLUtil.WHERE);
SQLUtil.getWhereClause(entity.getPrimaryKeyFields(), sql);
removeEntitySQL = sql.toString();
if(log.isDebugEnabled())
log.debug("Remove SQL: " + removeEntitySQL);
ConfigurationMetaData containerConfig = manager.getContainer().
getBeanMetaData().getContainerConfiguration();
syncOnCommitOnly = containerConfig.getSyncOnCommitOnly();
JDBCCMRFieldBridge[] cmrFields = (JDBCCMRFieldBridge[]) entity.getCMRFields();
for(int i = 0; i < cmrFields.length; ++i)
{
if(cmrFields[i].isBatchCascadeDelete())
{
batchCascadeDelete = true;
break;
}
}
}
public void execute(EntityEnterpriseContext ctx)
throws RemoveException, RemoteException
{
if(entity.isRemoved(ctx))
{
throw new IllegalStateException("Instance was already removed: id=" + ctx.getId());
}
entity.setIsBeingRemoved(ctx);
// remove entity from all relations
Object[] oldRelationsRef = new Object[1];
boolean needsSync = entity.removeFromRelations(ctx, oldRelationsRef);
// update the related entities (stores the removal from relationships)
// if one of the store fails an EJBException will be thrown
if(!syncOnCommitOnly && needsSync)
{
EntityContainer.synchronizeEntitiesWithinTransaction(ctx.getTransaction());
}
if(!batchCascadeDelete)
{
if(!entity.isScheduledForBatchCascadeDelete(ctx))
{
executeDeleteSQL(ctx);
}
else
{
if(log.isTraceEnabled())
log.trace("Instance is scheduled for cascade delete. id=" + ctx.getId());
}
}
// cascate-delete to old relations, if relation uses cascade.
if(oldRelationsRef[0] != null)
{
Map oldRelations = (Map)oldRelationsRef[0];
entity.cascadeDelete(ctx, oldRelations);
}
if(batchCascadeDelete)
{
if(!entity.isScheduledForBatchCascadeDelete(ctx))
{
executeDeleteSQL(ctx);
}
else
{
if(log.isTraceEnabled())
log.debug("Instance is scheduled for cascade delete. id=" + ctx.getId());
}
}
entity.setRemoved(ctx);
manager.getReadAheadCache().removeCachedData(ctx.getId());
}
private void executeDeleteSQL(EntityEnterpriseContext ctx) throws RemoveException
{
Object key = ctx.getId();
Connection con = null;
PreparedStatement ps = null;
int rowsAffected = 0;
try
{
if(log.isDebugEnabled())
log.debug("Executing SQL: " + removeEntitySQL);
// get the connection
con = entity.getDataSource().getConnection();
ps = con.prepareStatement(removeEntitySQL);
// set the parameters
entity.setPrimaryKeyParameters(ps, 1, key);
// execute statement
rowsAffected = ps.executeUpdate();
}
catch(Exception e)
{
log.error("Could not remove " + key, e);
throw new RemoveException("Could not remove " + key + ": " + e.getMessage());
}
finally
{
JDBCUtil.safeClose(ps);
JDBCUtil.safeClose(con);
}
// check results
if(rowsAffected == 0)
{
log.error("Could not remove entity " + key);
throw new RemoveException("Could not remove entity");
}
if(log.isTraceEnabled())
log.trace("Remove: Rows affected = " + rowsAffected);
}
}