/*
* Copyright 2000-2004 The Apache Software Foundation.
*
* 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.apache.jetspeed.daemon.impl.util.diskcachedaemon;
// jetspeed stuff
import java.util.Enumeration;
import org.apache.jetspeed.om.registry.PortletEntry;
import org.apache.jetspeed.services.Registry;
import org.apache.jetspeed.services.logging.JetspeedLogFactoryService;
import org.apache.jetspeed.services.logging.JetspeedLogger;
import org.apache.jetspeed.services.urlmanager.URLFetcher;
/**
* <p>
* URLRefresher that checks if a URL is updated remotely. If it is then it will
* pull the new URL down and try to reinstantiate all Portlets that depend on
* this URL.
* </p>
*
* @author <A HREF="mailto:burton@apache.org">Kevin A. Burton</A>
*/
public class URLRefresher implements Runnable {
private String url = null;
/**
* Static initialization of the logger for this class
*/
private static final JetspeedLogger logger = JetspeedLogFactoryService
.getLogger(URLRefresher.class.getName());
/**
* default constructor
*/
public URLRefresher(String url) {
this.url = url;
}
/**
* Used within the ThreadPool... IE Runnable interface.
*/
public void run() {
try {
// only update this if the URL on which it is based is newer
// than the one on disk.
if (URLFetcher.refresh(url)) {
// now make sure that the entry that depends on this HREF
// is updated in the PortletFactory.
// create a Runnable for updating this Portlet in the cache.
Enumeration enu = Registry.get(Registry.PORTLET).getEntries();
while (enu.hasMoreElements()) {
PortletEntry entry = (PortletEntry) enu.nextElement();
if ((entry.getURL() != null) && entry.getURL().equals(url)) {
try {
PortletRefresher pr = new PortletRefresher(entry);
// now put this Instantiator in the ThreadPool so that
// it can execute.
// SGP Trying to intersperse CPU intensive tasks with
// network intensive tasks
pr.run();
// ThreadPool.process( pr );
} catch (Throwable t) {
// FIXME: Put it in the bad URL list
logger.info("DiskCacheDaemon: Error refreshing: " + url);
}
}
}
}
} catch (Throwable t) {
logger.error("Error refreshing URL", t);
}
}
}