/*
* Copyright 2011 Red Hat, Inc. and/or its affiliates.
*
* 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
package org.infinispan.container.entries;
import org.infinispan.container.DataContainer;
import org.infinispan.container.versioning.EntryVersion;
import org.infinispan.container.versioning.InequalVersionComparisonResult;
import org.infinispan.context.impl.TxInvocationContext;
import org.infinispan.util.logging.Log;
import org.infinispan.util.logging.LogFactory;
/**
* A version of RepeatableReadEntry that can perform write-skew checks during prepare.
*
* @author Manik Surtani
* @since 5.1
*/
public class ClusteredRepeatableReadEntry extends RepeatableReadEntry {
private static final Log log = LogFactory.getLog(ClusteredRepeatableReadEntry.class);
private EntryVersion version;
public ClusteredRepeatableReadEntry(Object key, Object value, EntryVersion version, long lifespan) {
super(key, value, version, lifespan);
this.version = version;
}
public boolean performWriteSkewCheck(DataContainer container, TxInvocationContext ctx) {
EntryVersion prevVersion;
InternalCacheEntry ice = container.get(key);
if (ice == null) {
log.tracef("No entry for key %s found in data container" , key);
prevVersion = ctx.getCacheTransaction().getLookedUpRemoteVersion(key);
if (prevVersion == null) {
log.tracef("No looked up remote version for key %s found in context" , key);
return version == null;
}
} else {
prevVersion = ice.getVersion();
if (prevVersion == null)
throw new IllegalStateException("Entries cannot have null versions!");
}
// Could be that we didn't do a remote get first ... so we haven't effectively read this entry yet.
if (version == null) return true;
log.tracef("Comparing versions %s and %s for key %s: %s", prevVersion, version, key, prevVersion.compareTo(version));
return InequalVersionComparisonResult.AFTER != prevVersion.compareTo(version);
}
@Override
public EntryVersion getVersion() {
return version;
}
@Override
public void setVersion(EntryVersion version) {
this.version = version;
}
}