/*
* JBoss, Home of Professional Open Source
* Copyright 2009 Red Hat Inc. and/or its affiliates and other
* contributors as indicated by the @author tags. All rights reserved.
* See the copyright.txt 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.infinispan.container.entries;
import org.infinispan.container.DataContainer;
/**
* A marker entry to represent a null for repeatable read, so that a read that returns a null can continue to return
* null.
*
* @author Manik Surtani (<a href="mailto:manik@jboss.org">manik@jboss.org</a>)
* @since 4.0
*/
public class NullMarkerEntry extends NullMarkerEntryForRemoval {
private static final NullMarkerEntry INSTANCE = new NullMarkerEntry();
private NullMarkerEntry() {
super(null, null);
}
public static NullMarkerEntry getInstance() {
return INSTANCE;
}
/**
* A no-op.
*/
@Override
public final void copyForUpdate(DataContainer d, boolean localModeWriteSkewCheck) {
// no op
}
}