/**********************************************************************************
* $URL: https://source.sakaiproject.org/svn/rwiki/trunk/rwiki-impl/impl/src/java/uk/ac/cam/caret/sakai/rwiki/component/service/impl/RenderServiceImpl.java $
* $Id: RenderServiceImpl.java 17179 2006-10-17 23:38:22Z ian@caret.cam.ac.uk $
***********************************************************************************
*
* Copyright (c) 2003, 2004, 2005, 2006 The Sakai Foundation.
*
* Licensed under the Educational Community License, Version 1.0 (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.opensource.org/licenses/ecl1.php
*
* 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 uk.ac.cam.caret.sakai.rwiki.component.service.impl;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.radeox.api.engine.RenderEngine;
import org.radeox.api.engine.context.RenderContext;
import org.sakaiproject.component.api.ComponentManager;
import uk.ac.cam.caret.sakai.rwiki.service.api.PageLinkRenderer;
import uk.ac.cam.caret.sakai.rwiki.service.api.RenderService;
import uk.ac.cam.caret.sakai.rwiki.service.api.model.RWikiObject;
import uk.ac.cam.caret.sakai.rwiki.service.api.radeox.CachableRenderContext;
import uk.ac.cam.caret.sakai.rwiki.service.api.radeox.RenderCache;
import uk.ac.cam.caret.sakai.rwiki.service.api.radeox.RenderContextFactory;
import uk.ac.cam.caret.sakai.rwiki.service.api.radeox.RenderEngineFactory;
import uk.ac.cam.caret.sakai.rwiki.utils.TimeLogger;
/**
* @author andrew
*/
// FIXME: Component WITH FIXES, remove deps on page link render impl
public class RenderServiceImpl implements RenderService
{
private static Log log = LogFactory.getLog(RenderServiceImpl.class);
private RenderEngineFactory renderEngineFactory;
private RenderContextFactory renderContextFactory;
private RenderCache renderCache;
public void init()
{
ComponentManager cm = org.sakaiproject.component.cover.ComponentManager
.getInstance();
renderEngineFactory = (RenderEngineFactory) load(cm, RenderEngineFactory.class
.getName());
renderContextFactory = (RenderContextFactory) load(cm, RenderContextFactory.class.getName());
renderCache = (RenderCache) load(cm, RenderCache.class
.getName());
}
private Object load(ComponentManager cm, String name)
{
Object o = cm.get(name);
if (o == null)
{
log.error("Cant find Spring component named " + name);
}
return o;
}
public String renderPage(RWikiObject rwo, String pageSpace,
PageLinkRenderer plr)
{
long start = System.currentTimeMillis();
String renderedPage = null;
String cacheKey = getCacheKey(rwo, plr);
try
{
if (plr.canUseCache() && renderCache != null)
{
renderedPage = renderCache.getRenderedContent(cacheKey);
if (renderedPage != null)
{
if (TimeLogger.getLogResponse())
log.info("Cache HIT " + cacheKey);
else
log.debug("Cache HIT " + cacheKey);
return renderedPage;
}
}
else
{
log.debug("Render Cache Disabled");
}
RenderEngine renderEngine = renderEngineFactory.getRenderEngine(
pageSpace, plr);
RenderContext renderContext = renderContextFactory
.getRenderContext(rwo, renderEngine);
renderedPage = renderEngine.render(rwo.getContent(), renderContext);
if ( renderedPage.indexOf("<p ") < 0 && renderedPage.indexOf("</p>") < 0 )
{
renderedPage = "<p class=\"paragraph\">"+renderedPage+"</p>";
}
boolean canCache = false;
if (renderContext instanceof CachableRenderContext)
{
CachableRenderContext crc = (CachableRenderContext) renderContext;
canCache = crc.isCachable();
}
if (canCache && plr.isCachable() && plr.canUseCache())
{
if (renderCache != null)
{
renderCache.putRenderedContent(cacheKey, renderedPage);
if (TimeLogger.getLogResponse())
log.info("Cache PUT " + cacheKey);
else
log.debug("Cache PUT " + cacheKey);
}
else
{
log.debug("Could have cached output");
}
}
else
{
if (TimeLogger.getLogResponse())
log.info("Cant Cache " + cacheKey);
else
log.debug("Cant Cache " + cacheKey);
}
return renderedPage;
}
finally
{
long finish = System.currentTimeMillis();
TimeLogger.printTimer("Render: " + rwo.getName(), start, finish);
}
}
/**
* Generates a key for the page taking into account the page, version and
* link render mecahnism
*
* @param rwo
* @param plr
* @return
*/
public String getCacheKey(RWikiObject rwo, PageLinkRenderer plr)
{
String classNameHash = plr.getClass().getName();
classNameHash = classNameHash.substring(classNameHash.lastIndexOf("."));
return rwo.getId() + "." + rwo.getVersion().getTime() + "."
+ classNameHash;
}
}