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.optimistic.DataVersion;
import org.jboss.cache.transaction.GlobalTransaction;
import java.util.HashMap;
import java.util.Map;
/**
* Implements functionality defined by {@link org.jboss.cache.CacheSPI#removeNode(org.jboss.cache.Fqn)}
*
* @author Mircea.Markus@jboss.com
* @since 2.2
*/
public class RemoveNodeCommand extends AbstractVersionedDataCommand
{
public static final int METHOD_ID = 5;
public static final int VERSIONED_METHOD_ID = 40;
private static final Log log = LogFactory.getLog(RemoveNodeCommand.class);
private static boolean trace = log.isTraceEnabled();
/*parameters*/
private boolean skipSendingNodeEvents = false;
protected Fqn parentFqn;
protected NodeSPI targetNode;
protected Map originalData;
public RemoveNodeCommand(GlobalTransaction globalTransaction, Fqn fqn)
{
this.globalTransaction = globalTransaction;
this.fqn = fqn;
}
public RemoveNodeCommand()
{
}
/**
* Removes the node referenced by the specified Fqn.
*/
public Object perform(InvocationContext ctx)
{
if (trace) log.trace("perform(" + globalTransaction + ", \"" + fqn + ")");
// Find the node
targetNode = dataContainer.peekVersioned(fqn, dataVersion, true);
if (targetNode == null)
{
if (trace) log.trace("node " + fqn + " not found");
return false;
}
notifyBeforeRemove(targetNode, ctx);
NodeSPI parentNode = targetNode.getParent();
boolean found = targetNode.isValid() && !targetNode.isDeleted();
targetNode.markAsDeleted(true, true);
if (globalTransaction != null && found)
{
prepareForRollback(parentNode);
}
notifyAfterRemove(ctx);
return found;
}
private void prepareForRollback(NodeSPI parentNode)
{
parentFqn = parentNode.getFqn();
Map targetData = targetNode.getDataDirect();
if (!targetData.isEmpty())
{
originalData = new HashMap(targetNode.getDataDirect());
}
}
private void notifyBeforeRemove(NodeSPI n, InvocationContext ctx)
{
if (!skipSendingNodeEvents)
{
notifier.notifyNodeRemoved(fqn, true, n.getDataDirect(), ctx);
}
}
private void notifyAfterRemove(InvocationContext ctx)
{
if (!skipSendingNodeEvents)
{
notifier.notifyNodeRemoved(fqn, false, null, ctx);
}
}
public void rollback()
{
if (targetNode != null)
{
Object childName = targetNode.getFqn().getLastElement();
if (trace)
{
log.trace("rollback(parent: " + parentFqn + ", child: " + childName + ", node=" + targetNode + ")");
}
if (parentFqn == null || childName == null)
{
log.error("parent fqn or childName or childNode was null");
return;
}
NodeSPI parentNode = dataContainer.peek(parentFqn);
if (parentNode == null)
{
log.warn("node " + parentFqn + " not found");
return;
}
parentNode.addChild(childName, targetNode);
targetNode.markAsDeleted(false, true);
targetNode.clearDataDirect();
if (originalData != null) targetNode.putAllDirect(originalData);
targetNode.setValid(true, true);
}
}
public Object acceptVisitor(InvocationContext ctx, Visitor visitor) throws Throwable
{
return visitor.visitRemoveNodeCommand(ctx, this);
}
public boolean isSkipSendingNodeEvents()
{
return skipSendingNodeEvents;
}
public int getCommandId()
{
return isVersioned() ? VERSIONED_METHOD_ID : METHOD_ID;
}
@Override
public Object[] getParameters()
{
if (isVersioned())
return new Object[]{globalTransaction, fqn, true, skipSendingNodeEvents, dataVersion};
else
return new Object[]{globalTransaction, fqn, true, skipSendingNodeEvents};
}
@Override
public void setParameters(int commandId, Object[] args)
{
globalTransaction = (GlobalTransaction) args[0];
fqn = (Fqn) args[1];
skipSendingNodeEvents = (Boolean) args[3];
if (isVersionedId(commandId)) dataVersion = (DataVersion) args[4];
}
@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;
RemoveNodeCommand that = (RemoveNodeCommand) o;
if (skipSendingNodeEvents != that.skipSendingNodeEvents) return false;
if (globalTransaction != null ? !globalTransaction.equals(that.globalTransaction) : that.globalTransaction != null)
return false;
return true;
}
@Override
public int hashCode()
{
int result = super.hashCode();
result = 31 * result + (globalTransaction != null ? globalTransaction.hashCode() : 0);
result = 31 * result + (skipSendingNodeEvents ? 1 : 0);
return result;
}
@Override
protected boolean isVersionedId(int id)
{
return id == VERSIONED_METHOD_ID;
}
public void setSkipSendingNodeEvents(boolean skipSendingNodeEvents)
{
this.skipSendingNodeEvents = skipSendingNodeEvents;
}
@Override
public String toString()
{
return "RemoveNodeCommand{" +
"fqn=" + fqn +
", dataVersion=" + dataVersion +
", globalTransaction=" + globalTransaction +
", skipSendingNodeEvents=" + skipSendingNodeEvents +
", parentFqn=" + parentFqn +
", targetNode=" + targetNode +
'}';
}
}