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comparison src/goodjava/logger/RollingFileAppender.java @ 1473:6c6ce14db6a8

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add goodjava.io
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 17 Apr 2020 13:56:57 -0600
parents dd14d2dce7ee
children 97cc73664ca8
comparison
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1472:60f6741f000a 1473:6c6ce14db6a8
1 package goodjava.logger; 1 package goodjava.logger;
2 2
3 import java.io.File; 3 import java.io.File;
4 import java.io.FileWriter; 4 import java.io.FileWriter;
5 import java.io.IOException; 5 import java.io.IOException;
6 import goodjava.io.IoUtils;
6 7
7 8
8 public class RollingFileAppender extends WriterAppender { 9 public class RollingFileAppender extends WriterAppender {
9 protected final String fileName; 10 protected final String fileName;
10 protected final File file; 11 protected final File file;
30 } 31 }
31 32
32 protected void rollOver() { 33 protected void rollOver() {
33 close(); 34 close();
34 File backup = new File(fileName+'.'+backups); 35 File backup = new File(fileName+'.'+backups);
35 if( backup.exists() ) {
36 if( !backup.delete() )
37 debug("couldn't delete "+backup);
38 }
39 for( int i=backups-1; i>=1; i-- ) {
40 File f = backup;
41 backup = new File(fileName+'.'+i);
42 backup.renameTo(f);
43 }
44 if( !file.renameTo(backup) )
45 debug("couldn't rename "+file+" to "+backup);
46 try { 36 try {
37 IoUtils.delete(backup);
38 for( int i=backups-1; i>=1; i-- ) {
39 File f = backup;
40 backup = new File(fileName+'.'+i);
41 IoUtils.move(backup,f);
42 }
43 IoUtils.move(file,backup);
47 open(); 44 open();
48 } catch(IOException e) { 45 } catch(IOException e) {
49 throw new RuntimeException(e); 46 throw new RuntimeException(e);
50 } 47 }
51 } 48 }
52
53 protected void debug(String msg) {
54 System.err.println("RollingFileAppender: "+msg);
55 }
56 } 49 }