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Java > Open Source Codes > org > apache > jetspeed > daemon > DaemonThread


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;
18
19 import org.apache.jetspeed.services.daemonfactory.DaemonFactory;
20 import org.apache.jetspeed.services.logging.JetspeedLogFactoryService;
21 import org.apache.jetspeed.services.logging.JetspeedLogger;
22
23 /**
24 @author <a HREF="mailto:burton@apache.org">Kevin A. Burton</a>
25 @version $Id: DaemonThread.java,v 1.20 2004/02/23 02:48:57 jford Exp $
26 */
27 public class DaemonThread extends Thread JavaDoc {
28
29     private Daemon daemon = null;
30     
31     /**
32      * Static initialization of the logger for this class
33      */
34     private static final JetspeedLogger logger = JetspeedLogFactoryService.getLogger(DaemonThread.class.getName());
35     
36     /**
37     */
38     public DaemonThread( DaemonEntry entry ) {
39         
40         super( "DaemonThread:" + entry.getName() );
41         try {
42             this.setDaemon(true);
43             this.daemon = DaemonFactory.getDaemon( entry );
44             this.setPriority( Thread.MIN_PRIORITY );
45         } catch (DaemonException e) {
46             //really screwed here.
47 logger.error("Error instantiating DaemonThread", e);
48         }
49     }
50     
51
52     public DaemonThread()
53     {
54         super();
55         this.setDaemon(true);
56     }
57     
58     /**
59     */
60     public Daemon getDaemon() {
61         return this.daemon;
62     }
63     
64     /**
65     */
66     public void run() {
67         //at the very minimum this daemon is processing...
68
69         DaemonEntry de = this.getDaemon().getDaemonEntry();
70         
71         logger.info( "DaemonThread: started processing daemon " + de.getName() );
72
73         if ( de.onStartup() ) {
74             this.runDaemon( this.getDaemon() );
75         }
76         
77
78         while( true ) {
79
80             //move the seconds to miliseconds
81 try {
82
83                 synchronized( this ) {
84                     this.wait( de.getInterval() * 1000 );
85                 }
86
87             } catch (InterruptedException JavaDoc e) {
88                 //this is a normal situation.
89 //the DaemonFactory may want to stop this thread form
90 //sleeping and call interrupt() on this thread.
91 }
92
93             this.runDaemon( this.getDaemon() );
94         
95         }
96     
97
98     }
99
100     /**
101     */
102     private void runDaemon( Daemon daemon ) {
103  
104         daemon.setStatus( Daemon.STATUS_PROCESSING );
105
106         logger.info( "DaemonThread -> PROCESSING daemon -> " + daemon.getDaemonEntry().getName() );
107         
108         try {
109             daemon.run();
110         } catch ( Throwable JavaDoc t ) {
111             logger.error( "Could not process Daemon: " + daemon.getDaemonEntry().getName(), t );
112         }
113
114         logger.info( "DaemonThread -> *DONE* PROCESSING daemon -> " + daemon.getDaemonEntry().getName() );
115
116         daemon.setStatus( Daemon.STATUS_PROCESSED );
117
118     }
119
120     
121 }
122
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