/*
* JBoss, Home of Professional Open Source.
* Copyright 2009, 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.system.server.profileservice.repository.clustered.sync;
import org.jboss.logging.Logger;
import org.jboss.system.server.profileservice.repository.clustered.metadata.RepositoryItemMetadata;
import org.jboss.system.server.profileservice.repository.clustered.sync.ContentModification.Type;
/**
* Generates {@link ContentModification} object from a comparison
* of a current snapshot of local repository content to a official snapshot.
* This generator will only generate modifications that push content to the
* cluster or that tell the cluster to remove content; no modifications
* pulling content from the cluster or removing local content will be
* generated.
* <p>This generator should only be used when the node has been fully
* synchronized with the cluster; it assumes any changes are acceptable
* to the cluster.</p>
*
* @author Brian Stansberry
*
* @version $Revision: $
*/
public class LocalContentModificationGenerator extends AbstractContentModificationGenerator
{
private static final Logger log = Logger.getLogger(LocalContentModificationGenerator.class);
@Override
protected void handleAddition(String rootName,
RepositoryItemMetadata item, GeneratedModifications mods)
{
// If this is an addition, it can't be the child of an earlier removal.
// So, drain any remaining preapproved removals
drainPreapprovedRemovals(mods);
Type type = item.isDirectory() ? Type.MKDIR_TO_CLUSTER : Type.PUSH_TO_CLUSTER;
mods.addModification(new ContentModification(type, rootName, item));
if (log.isTraceEnabled())
{
log.trace("created " + type + " modification for " + item.getRelativePath());
}
}
// @Override
// protected void handleMatch(String rootName,
// RepositoryItemMetadata base, RepositoryItemMetadata modified, GeneratedModifications mods)
// {
// drainPreapprovedRemovals(mods);
// if (base.equals(modified) == false)
// {
// if (base.isDirectory() != modified.isDirectory())
// {
// // Swapped exploded for zipped or vice versa
// if (!base.isRemoved())
// {
// mods.addModification(new ContentModification(Type.REMOVE_TO_CLUSTER, rootName, base));
// }
// }
// mods.addModification(new ContentModification(Type.PUSH_TO_CLUSTER, rootName, modified));
// }
// }
@Override
protected void handleMissing(String rootName,
RepositoryItemMetadata item, GeneratedModifications mods)
{
if (!item.isRemoved())
{
handleRemoval(rootName, item, mods);
}
// else it's the brain-dead case where we have metadata recording the
// removal but no file -- 'cause it's removed! In which case there's no
// need to do anything.
}
@Override
protected void handleChangeToDirectory(String rootName, RepositoryItemMetadata base, RepositoryItemMetadata modified,
GeneratedModifications mods)
{
// This is a modification, so it can't be the child of an earlier removal.
// So, drain any remaining preapproved removals
drainPreapprovedRemovals(mods);
mods.addModification(new ContentModification(Type.MKDIR_TO_CLUSTER, rootName, modified));
if (log.isTraceEnabled())
{
log.trace("created " + Type.MKDIR_TO_CLUSTER + " modification for " + modified.getRelativePath());
}
}
@Override
protected void handleAddition(String rootName, RepositoryItemMetadata modified, RepositoryItemMetadata base,
GeneratedModifications mods)
{
handleAddition(rootName, modified, mods);
}
@Override
protected void handleChangeFromDirectory(String rootName, RepositoryItemMetadata base,
RepositoryItemMetadata modified, GeneratedModifications mods)
{
// This is a modification, so it can't be the child of an earlier removal.
// So, drain any remaining preapproved removals
drainPreapprovedRemovals(mods);
// We're going to need to remove all the content that was
// under "base" from all the nodes in the cluster before we
// can push the replacement file. So, we put the PUSH_TO_CLUSTER
// on the stack to be inserted once all the child removals
// are done.
ContentModification mod = new ContentModification(Type.PUSH_TO_CLUSTER, rootName, modified);
mods.pushPreapprovedRemoveParent(mod);
if (log.isTraceEnabled())
{
log.trace("created " + Type.PUSH_TO_CLUSTER + " modification for " + modified.getRelativePath());
}
}
@Override
protected void handleDirectoryTimestampModification(String rootName, RepositoryItemMetadata base,
RepositoryItemMetadata modified, GeneratedModifications mods)
{
// If this is a modification, it can't be the child of an earlier removal.
// So, drain any remaining preapproved removals
drainPreapprovedRemovals(mods);
mods.addModification(new ContentModification(Type.DIR_TIMESTAMP_MISMATCH, rootName, base));
if (log.isTraceEnabled())
{
log.trace("created " + Type.DIR_TIMESTAMP_MISMATCH + " modification for " + base.getRelativePath());
}
}
@Override
protected void handleSimpleModification(String rootName, RepositoryItemMetadata base, RepositoryItemMetadata modified,
GeneratedModifications mods)
{
// If this is a modification, it can't be the child of an earlier removal.
// So, drain any remaining preapproved removals
drainPreapprovedRemovals(mods);
mods.addModification(new ContentModification(Type.PUSH_TO_CLUSTER, rootName, modified));
if (log.isTraceEnabled())
{
log.trace("created " + Type.PUSH_TO_CLUSTER + " modification for " + modified.getRelativePath());
}
}
@Override
protected void handleRemoval(String rootName, RepositoryItemMetadata item, GeneratedModifications mods)
{
ContentModification removedParent = mods.peekPreapprovedRemoveParent();
while (removedParent != null && item.isChildOf(removedParent.getItem()) == false)
{
mods.addModification(mods.popPreapprovedRemoveParent());
removedParent = mods.peekPreapprovedRemoveParent();
}
ContentModification removal = new ContentModification(Type.REMOVE_TO_CLUSTER, rootName, item);
if (item.isDirectory())
{
// Tell cluster to prepare for the removal
mods.addModification(new ContentModification(Type.PREPARE_RMDIR_TO_CLUSTER, rootName, item));
// Push the actual removal on the stack to execute when
// children are done
mods.pushPreapprovedRemoveParent(removal);
if (log.isTraceEnabled())
{
log.trace("created " + Type.PREPARE_RMDIR_TO_CLUSTER + " modification for " + item.getRelativePath());
}
}
else
{
mods.addModification(removal);
}
if (log.isTraceEnabled())
{
log.trace("created " + Type.REMOVE_TO_CLUSTER + " modification for " + item.getRelativePath());
}
}
}