Java tutorial
/* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.acegisecurity.providers.dao.cache; import net.sf.ehcache.CacheException; import net.sf.ehcache.Element; import net.sf.ehcache.Ehcache; import org.acegisecurity.providers.dao.UserCache; import org.acegisecurity.userdetails.UserDetails; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.beans.factory.InitializingBean; import org.springframework.dao.DataRetrievalFailureException; import org.springframework.util.Assert; /** * Caches <code>User</code> objects using a Spring IoC defined <A * HREF="http://ehcache.sourceforge.net">EHCACHE</a>. * * @author Ben Alex * @version $Id: EhCacheBasedUserCache.java 1965 2007-08-27 23:41:59Z luke_t $ */ public class EhCacheBasedUserCache implements UserCache, InitializingBean { //~ Static fields/initializers ===================================================================================== private static final Log logger = LogFactory.getLog(EhCacheBasedUserCache.class); //~ Instance fields ================================================================================================ private Ehcache cache; //~ Methods ======================================================================================================== public void afterPropertiesSet() throws Exception { Assert.notNull(cache, "cache mandatory"); } public Ehcache getCache() { return cache; } public UserDetails getUserFromCache(String username) { Element element = null; try { element = cache.get(username); } catch (CacheException cacheException) { throw new DataRetrievalFailureException("Cache failure: " + cacheException.getMessage()); } if (logger.isDebugEnabled()) { logger.debug("Cache hit: " + (element != null) + "; username: " + username); } if (element == null) { return null; } else { return (UserDetails) element.getValue(); } } public void putUserInCache(UserDetails user) { Element element = new Element(user.getUsername(), user); if (logger.isDebugEnabled()) { logger.debug("Cache put: " + element.getKey()); } cache.put(element); } public void removeUserFromCache(UserDetails user) { if (logger.isDebugEnabled()) { logger.debug("Cache remove: " + user.getUsername()); } this.removeUserFromCache(user.getUsername()); } public void removeUserFromCache(String username) { cache.remove(username); } public void setCache(Ehcache cache) { this.cache = cache; } }