/*
* JBoss, Home of Professional Open Source.
* 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.write;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jboss.cache.Fqn;
import org.jboss.cache.InvocationContext;
import org.jboss.cache.NodeSPI;
import org.jboss.cache.commands.Visitor;
import org.jboss.cache.notifications.event.NodeModifiedEvent;
import org.jboss.cache.optimistic.DataVersion;
import org.jboss.cache.transaction.GlobalTransaction;
import java.util.Map;
/**
* Implements functionality defined by {@link org.jboss.cache.Cache#clearData(String)}}
*
* @author Mircea.Markus@jboss.com
* @since 2.2
*/
public class ClearDataCommand extends AbstractVersionedDataCommand
{
public static final int METHOD_ID = 7;
public static final int VERSIONED_METHOD_ID = 42;
protected static final Log log = LogFactory.getLog(ClearDataCommand.class);
protected static final boolean trace = log.isTraceEnabled();
public ClearDataCommand(GlobalTransaction gtx, Fqn fqn)
{
this.globalTransaction = gtx;
this.fqn = fqn;
}
public ClearDataCommand()
{
}
/**
* Clears the data map in the node referenced by the specified Fqn.
*
* @param ctx invocation context
* @return null
*/
public Object perform(InvocationContext ctx)
{
if (trace) log.trace("perform(" + globalTransaction + ", \"" + fqn + "\")");
NodeSPI targetNode = peekVersioned(ctx);
if (targetNode == null)
{
log.warn("node " + fqn + " not found");
return null;
}
Map data = targetNode.getDataDirect();
notifier.notifyNodeModified(fqn, true, NodeModifiedEvent.ModificationType.REMOVE_DATA, data, ctx);
targetNode.clearDataDirect();
notifier.notifyNodeModified(fqn, false, NodeModifiedEvent.ModificationType.REMOVE_DATA, data, ctx);
return null;
}
public Object acceptVisitor(InvocationContext ctx, Visitor visitor) throws Throwable
{
return visitor.visitClearDataCommand(ctx, this);
}
public int getCommandId()
{
return isVersioned() ? VERSIONED_METHOD_ID : METHOD_ID;
}
@Override
public Object[] getParameters()
{
if (isVersioned())
return new Object[]{globalTransaction, fqn, true, dataVersion};
else
return new Object[]{globalTransaction, fqn, true};
}
@Override
public void setParameters(int commandId, Object[] args)
{
globalTransaction = (GlobalTransaction) args[0];
fqn = (Fqn) args[1];
if (isVersionedId(commandId)) dataVersion = (DataVersion) args[3];
}
@Override
public boolean equals(Object o)
{
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
if (!super.equals(o)) return false;
ClearDataCommand that = (ClearDataCommand) o;
return !(globalTransaction != null ? !globalTransaction.equals(that.globalTransaction) : that.globalTransaction != null);
}
@Override
public int hashCode()
{
int result = super.hashCode();
result = 31 * result + (globalTransaction != null ? globalTransaction.hashCode() : 0);
return result;
}
@Override
protected boolean isVersionedId(int id)
{
return id == VERSIONED_METHOD_ID;
}
@Override
public String toString()
{
return "RemoveDataCommand{" +
"fqn=" + fqn +
", dataVersion=" + dataVersion +
", globalTransaction=" + globalTransaction +
'}';
}
}