/*
 * 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.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 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) {
      InternalCacheEntry ice = container.get(key, null);
      if (ice == null) {
         log.tracef("Entry for key '%s' doesn't exist in the container and current version is %s", key, version);
         return version == null;
      }
      if (ice.getVersion() == null)
         throw new IllegalStateException("Entries cannot have null versions! Entry is " + key);
      // 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("Current version is: %s, version at read time is %s", ice.getVersion(), version);
      return InequalVersionComparisonResult.AFTER != ice.getVersion().compareTo(version);
   }

   @Override
   public EntryVersion getVersion() {
      return version;
   }

   @Override
   public void setVersion(EntryVersion version) {
      this.version = version;
   }
}