001    /*
002     * $RCSfile: StopWhenSatisfiedStrategy.java,v $
003     *
004     * Created on March 13, 10:20 AM
005     *
006     * This file is part of the STAR Scheduler.
007     * Copyright (c) 2002-2006 STAR Collaboration - Brookhaven National Laboratory
008     *
009     * STAR Scheduler is free software; you can redistribute it and/or modify
010     * it under the terms of the GNU General Public License as published by
011     * the Free Software Foundation; either version 2 of the License, or
012     * (at your option) any later version.
013     *
014     * STAR Scheduler is distributed in the hope that it will be useful,
015     * but WITHOUT ANY WARRANTY; without even the implied warranty of
016     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
017     * GNU General Public License for more details.
018     *
019     * You should have received a copy of the GNU General Public License
020     * along with STAR Scheduler; if not, write to the Free Software
021     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
022     */
023    
024    package gov.bnl.star.offline.scheduler.catalog;
025    
026    import gov.bnl.star.offline.scheduler.CatalogQuery;
027    
028    import java.util.Iterator;
029    
030    /**@deprecated please see gov.bnl.star.offline.scheduler.dataset.* for replacements.
031     * @author Gabriele Carcassi & Pavel Jakl
032     * @version $Revision: 1.7 $ $Date: 2006/11/21 00:41:31 $
033     */
034    public class StopWhenSatisfiedStrategy implements QueryStrategy {
035    
036        public QueryResult resolveQuery(FileCatalog catalog, CatalogQuery query) {
037            double prefetch = 1.01;
038            if (query.isSingleCopy()) prefetch = 2.5;
039            QueryResult result = new QueryResult();
040            Iterator iter = catalog.executeQuery(query.getQuery(), (int) (query.getNFiles().intValue() * prefetch));
041            while (iter.hasNext() && !satisfied(result, query)) {
042                PhysicalFile file = (PhysicalFile) iter.next();
043                result.add(file.getLogicalID(), file);
044            }
045            return result;
046        }
047    
048        private boolean satisfied(QueryResult list, CatalogQuery query) {
049            int nFiles = query.getNFiles().intValue();
050            if (query.isSingleCopy()) {
051                if (nFiles <= list.getLogicalCount()) return true;
052            } else {
053                if (nFiles <= list.getPhysicalCount()) return true;
054            }
055            return false;
056        }
057    }