/*
 * 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.loaders.bdbje;

import com.sleepycat.collections.TransactionWorker;
import org.infinispan.loaders.CacheStore;
import org.infinispan.loaders.modifications.Modification;
import org.infinispan.loaders.modifications.Remove;
import org.infinispan.loaders.modifications.Store;

import java.util.List;

/**
 * Adapter that allows a list of {@link Modification}s to be performed atomically via {@link
 * com.sleepycat.collections.TransactionRunner}.
 *
 * @author Adrian Cole
 * @since 4.0
 */
public class ModificationsTransactionWorker implements TransactionWorker {
   private List<? extends Modification> mods;
   private CacheStore cs;

   /**
    * Associates {@link Modification}s that will be applied to the supplied {@link CacheStore}
    *
    * @param store what to affect
    * @param mods  actions to take
    */
   public ModificationsTransactionWorker(CacheStore store, List<? extends Modification> mods) {
      this.cs = store;
      this.mods = mods;
   }

   /**
    * {@inheritDoc} This implementation iterates through a list of work represented by {@link Modification} objects and
    * executes it against the {@link CacheStore}.<p/> Current commands supported are: <ul> <li>STORE</li> <li>CLEAR</li>
    * <li>REMOVE</li> <li>PURGE_EXPIRED</li> </ul>
    */
   @Override
   public void doWork() throws Exception {
      for (Modification modification : mods)
         switch (modification.getType()) {
            case STORE:
               Store s = (Store) modification;
               cs.store(s.getStoredEntry());
               break;
            case CLEAR:
               cs.clear();
               break;
            case REMOVE:
               Remove r = (Remove) modification;
               cs.remove(r.getKey());
               break;
            case PURGE_EXPIRED:
               cs.purgeExpired();
               break;
            default:
               throw new IllegalArgumentException("Unknown modification type " + modification.getType());
         }
   }
}