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/* ================================================================
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* Cewolf : Chart enabling Web Objects Framework
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* ================================================================
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*
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* Project Info: http://cewolf.sourceforge.net
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* Project Lead: Guido Laures (guido@laures.de);
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*
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* (C) Copyright 2002, by Guido Laures
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*
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* This library is free software; you can redistribute it and/or modify it under the terms
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* of the GNU Lesser General Public License as published by the Free Software Foundation;
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* either version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License along with this
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* library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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package de.laures.cewolf.storage;
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import java.io.Serializable;
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import javax.servlet.ServletContext;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpSession;
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import javax.servlet.jsp.PageContext;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import de.laures.cewolf.CewolfException;
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import de.laures.cewolf.ChartImage;
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import de.laures.cewolf.Storage;
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import de.laures.cewolf.taglib.util.KeyGenerator;
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/**
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* @author glaures
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*/
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public abstract class AbstractSessionStorage implements Storage
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{
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private static final Log log = LogFactory.getLog(AbstractSessionStorage.class);
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/**
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* @see de.laures.cewolf.Storage#storeChartImage(ChartImage, ServletContext)
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*/
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public String storeChartImage( ChartImage cid, PageContext pageContext ) throws CewolfException
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{
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if ( contains(cid, pageContext) )
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{
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return getKey(cid);
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}
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log.debug("storing chart " + cid);
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final HttpSession session = pageContext.getSession();
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//String key = getKey(cid);
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return storeChartImage(cid, session);
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}
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/**
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* @see de.laures.cewolf.Storage#getChartImage(String)
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*/
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public ChartImage getChartImage( String id, HttpServletRequest request )
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{
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HttpSession session = request.getSession();
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return (ChartImage) session.getAttribute(id);
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}
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public boolean contains( ChartImage cid, PageContext pageContext )
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{
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return pageContext.getSession().getAttribute(getKey(cid)) != null;
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}
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public final String getKey( ChartImage cid )
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{
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return String.valueOf(KeyGenerator.generateKey((Serializable) cid));
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}
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protected String storeChartImage( ChartImage cid, HttpSession session ) throws CewolfException
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{
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final String sessionKey = getKey(cid);
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synchronized (session)
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{
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session.setAttribute(sessionKey, getCacheObject(cid));
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}
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return sessionKey;
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}
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/**
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*/
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public String removeChartImage(String imgKey, HttpServletRequest request)
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throws CewolfException {
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final HttpSession session = request.getSession();
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if (session == null)
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{
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return imgKey;
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}
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return removeChartImage(imgKey, session);
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}
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/**
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* @param cid
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* @param session
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* @return
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* @throws CewolfException
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*/
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protected String removeChartImage(String cid, HttpSession session)
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throws CewolfException {
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synchronized (session) {
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session.removeAttribute(cid);
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}
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return cid;
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}
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protected abstract Object getCacheObject( ChartImage cid ) throws CewolfException;
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/**
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* @see de.laures.cewolf.Storage#init(ServletContext)
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*/
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public void init( ServletContext servletContext ) throws CewolfException
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{
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}
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} |