1 /*
2 * Copyright 2000-2004 The Apache Software Foundation.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package org.apache.jetspeed.daemon.impl.util.diskcachedaemon;
18
19 //jetspeed stuff
20 import org.apache.jetspeed.om.registry.PortletEntry;
21 import org.apache.jetspeed.services.logging.JetspeedLogFactoryService;
22 import org.apache.jetspeed.services.logging.JetspeedLogger;
23 import org.apache.jetspeed.services.Registry;
24 import org.apache.jetspeed.services.urlmanager.URLFetcher;
25
26 //Java stuff
27 import java.util.Enumeration;
28
29 /***
30 <p>
31 URLRefresher that checks if a URL is updated remotely. If it is then it will
32 pull the new URL down and try to reinstantiate all Portlets that depend on this
33 URL.
34 </p>
35
36 @author <A HREF="mailto:burton@apache.org">Kevin A. Burton</A>
37 @version $Id: URLRefresher.java,v 1.16 2004/02/23 02:47:00 jford Exp $
38 */
39 public class URLRefresher implements Runnable {
40
41 private String url = null;
42
43 /***
44 * Static initialization of the logger for this class
45 */
46 private static final JetspeedLogger logger = JetspeedLogFactoryService.getLogger(URLRefresher.class.getName());
47
48 /***
49 default constructor
50 */
51 public URLRefresher( String url ) {
52
53 this.url = url;
54
55 }
56
57 /***
58 Used within the ThreadPool... IE Runnable interface.
59 */
60 public void run() {
61
62 try {
63
64 //only update this if the URL on which it is based is newer
65 //than the one on disk.
66 if(URLFetcher.refresh(url)) {
67 //now make sure that the entry that depends on this HREF
68 //is updated in the PortletFactory.
69
70
71 //create a Runnable for updating this Portlet in the cache.
72
73 Enumeration enum = Registry.get(Registry.PORTLET).getEntries();
74
75 while( enum.hasMoreElements() ) {
76 PortletEntry entry = (PortletEntry)enum.nextElement();
77
78 if ( (entry.getURL()!= null) && entry.getURL().equals(url) )
79 {
80 try
81 {
82 PortletRefresher pr = new PortletRefresher( entry );
83
84 //now put this Instantiator in the ThreadPool so that
85 //it can execute.
86 //SGP Trying to intersperse CPU intensive tasks with
87 // network intensive tasks
88 pr.run();
89 //ThreadPool.process( pr );
90 }
91 catch (Throwable t)
92 {
93 //FIXME: Put it in the bad URL list
94 logger.info( "DiskCacheDaemon: Error refreshing: " + url );
95 }
96 }
97 }
98 }
99 } catch ( Throwable t ) {
100 logger.error("Error refreshing URL", t);
101 }
102 }
103 }