001    /*
002      Copyright (C) 2002 Laurent Martelli <laurent@aopsys.com>
003    
004      This program is free software; you can redistribute it and/or modify
005      it under the terms of the GNU Lesser General Public License as
006      published by the Free Software Foundation; either version 2 of the
007      License, or (at your option) any later version.
008    
009      This program is distributed in the hope that it will be useful,
010      but WITHOUT ANY WARRANTY; without even the implied warranty of
011      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
012      GNU Lesser General Public License for more details.
013    
014      You should have received a copy of the GNU Lesser General Public License
015      along with this program; if not, write to the Free Software
016      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
017    
018    package org.objectweb.jac.aspects.cache;
019    
020    import java.util.Iterator;
021    import org.apache.log4j.Logger;
022    import org.objectweb.jac.core.AspectComponent;
023    import org.objectweb.jac.core.rtti.AbstractMethodItem;
024    
025    /**
026     * This aspect handle caching of method results.
027     */
028    
029    public class CacheAC extends AspectComponent implements CacheConf {
030        static final Logger logger = Logger.getLogger("cache");
031    
032        public static final String IGNORED_PARAMETERS = "CacheAC.IGNORED_PARAMETERS";
033    
034        /**
035         * Cache a method result.
036         *
037         * @param classExpr the classes
038         * @param methodExpr the methods cached
039         */
040        public void cache(String classExpr, String methodExpr)
041        {
042            logger.info("cache "+classExpr+"."+methodExpr);
043    
044            pointcut("ALL",classExpr,methodExpr,
045                     "org.objectweb.jac.aspects.cache.CacheWrapper",
046                     null,NOT_SHARED);
047        }
048    
049        public void cacheWithTimeStamps(
050            String classExpr, String methodExpr,
051            String stampsName)
052        {
053            logger.info("cache "+classExpr+"."+methodExpr);
054    
055            pointcut(
056                "ALL", classExpr, methodExpr,
057                "org.objectweb.jac.aspects.cache.CacheWrapper",
058                new Object[] {stampsName},
059                null,
060                NOT_SHARED);
061        }
062    
063        public void setIgnoredParameters(AbstractMethodItem method, 
064                                         int[] ignored) 
065        {
066            method.setAttribute(IGNORED_PARAMETERS,ignored);
067        }
068    
069        public void invalidateCache() {
070            Iterator i = wrappers.iterator();
071            while(i.hasNext()) {
072                CacheWrapper wrapper = (CacheWrapper)i.next();
073                wrapper.invalidate();
074            }
075        }
076    }