/*
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* Copyright 2000 - 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.cache.commands.legacy.write;
import org.jboss.cache.Fqn;
import org.jboss.cache.InvocationContext;
import org.jboss.cache.NodeSPI;
import org.jboss.cache.commands.legacy.ReversibleCommand;
import org.jboss.cache.commands.write.PutDataMapCommand;
import org.jboss.cache.transaction.GlobalTransaction;
import java.util.HashMap;
import java.util.Map;
/**
* A version of {@link org.jboss.cache.commands.write.PutDataMapCommand} which can be rolled back, for use with
* pessimistic locking where changes are made directly on the data structures and may need to be reversed.
*
* @author Manik Surtani (<a href="mailto:manik AT jboss DOT org">manik AT jboss DOT org</a>)
* @since 3.0
* @deprecated will be removed along with optimistic and pessimistic locking.
*/
@Deprecated
public class PessPutDataMapCommand extends PutDataMapCommand implements ReversibleCommand
{
Map oldData;
public PessPutDataMapCommand(GlobalTransaction globalTransaction, Fqn fqn, Map data)
{
super(globalTransaction, fqn, data);
}
public PessPutDataMapCommand()
{
}
@Override
public Object perform(InvocationContext ctx)
{
// first get a hold of existing data.
NodeSPI node = ctx.lookUpNode(fqn);
Map existingData = node == null ? null : node.getDataDirect();
if (existingData != null && !existingData.isEmpty())
{
oldData = new HashMap(existingData); // defensive copy
}
return super.perform(ctx);
}
public void rollback()
{
if (trace) log.trace("rollback(" + globalTransaction + ", " + fqn + ", " + data + ")");
NodeSPI n = dataContainer.peek(fqn, false, true);
if (n != null)
{
n.clearDataDirect();
if (oldData != null) n.putAllDirect(oldData);
}
}
}