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Java > Open Source Codes > hudson > tasks > LogRotator


1 package hudson.tasks;
2
3 import hudson.model.Describable;
4 import hudson.model.Descriptor;
5 import hudson.model.Job;
6 import hudson.model.Run;
7 import hudson.scm.SCM;
8 import org.kohsuke.stapler.StaplerRequest;
9
10 import javax.servlet.http.HttpServletRequest JavaDoc;
11 import java.io.IOException JavaDoc;
12 import java.util.Calendar JavaDoc;
13 import java.util.GregorianCalendar JavaDoc;
14
15 /**
16  * Deletes old log files.
17  *
18  * TODO: is there any other task that follows the same pattern?
19  * try to generalize this just like {@link SCM} or {@link BuildStep}.
20  *
21  * @author Kohsuke Kawaguchi
22  */
23 public class LogRotator implements Describable<LogRotator> {
24
25     /**
26      * If not -1, history is only kept up to this days.
27      */
28     private final int daysToKeep;
29
30     /**
31      * If not -1, only this number of build logs are kept.
32      */
33     private final int numToKeep;
34
35     public LogRotator(int daysToKeep, int numToKeep) {
36         this.daysToKeep = daysToKeep;
37         this.numToKeep = numToKeep;
38     }
39
40     public void perform(Job<?,?> job) throws IOException JavaDoc {
41         // keep the last successful build regardless of the status
42 Run lsb = job.getLastSuccessfulBuild();
43
44         if(numToKeep!=-1) {
45             Run[] builds = job.getBuilds().toArray(new Run[0]);
46             for( int i=numToKeep; i<builds.length; i++ ) {
47                 if(!builds[i].isKeepLog() && builds[i]!=lsb)
48                     builds[i].delete();
49             }
50         }
51
52         if(daysToKeep!=-1) {
53             Calendar JavaDoc cal = new GregorianCalendar JavaDoc();
54             cal.add(Calendar.DAY_OF_YEAR,-daysToKeep);
55             // copy it to the array because we'll be deleting builds as we go.
56 for( Run r : job.getBuilds().toArray(new Run[0]) ) {
57                 if(r.getTimestamp().before(cal) && !r.isKeepLog() && r!=lsb)
58                     r.delete();
59             }
60         }
61     }
62
63     public int getDaysToKeep() {
64         return daysToKeep;
65     }
66
67     public int getNumToKeep() {
68         return numToKeep;
69     }
70
71     public String JavaDoc getDaysToKeepStr() {
72         if(daysToKeep==-1) return "";
73         else return String.valueOf(daysToKeep);
74     }
75
76     public String JavaDoc getNumToKeepStr() {
77         if(numToKeep==-1) return "";
78         else return String.valueOf(numToKeep);
79     }
80
81     public LRDescriptor getDescriptor() {
82         return DESCRIPTOR;
83     }
84
85     public static final LRDescriptor DESCRIPTOR = new LRDescriptor();
86
87     public static final class LRDescriptor extends Descriptor<LogRotator> {
88         private LRDescriptor() {
89             super(LogRotator.class);
90         }
91
92         public String JavaDoc getDisplayName() {
93             return "Log Rotation";
94         }
95
96         public LogRotator newInstance(StaplerRequest req) {
97             return new LogRotator(
98                     parse(req,"logrotate_days"),
99                     parse(req,"logrotate_nums") );
100         }
101
102         private int parse(HttpServletRequest JavaDoc req, String JavaDoc name) {
103             String JavaDoc p = req.getParameter(name);
104             if(p==null) return -1;
105             try {
106                 return Integer.parseInt(p);
107             } catch (NumberFormatException JavaDoc e) {
108                 return -1;
109             }
110         }
111     }
112 }
113
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