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1449
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1 package goodjava.logger;
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2
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3 import java.io.File;
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4 import java.io.FileWriter;
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5 import java.io.IOException;
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6
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7
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8 public class RollingFileAppender extends WriterAppender {
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9 protected final String fileName;
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10 protected final File file;
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11 public long maxFileSize = 10*1024*1024;
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12 public int backups = 1;
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13
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14 public RollingFileAppender(Layout layout,String fileName) throws IOException {
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15 super(layout,null);
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16 this.fileName = fileName;
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17 this.file = new File(fileName);
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18 open();
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19 }
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20
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21 protected void open() throws IOException {
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22 this.writer = new FileWriter(file,true);
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23 }
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24
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25 public synchronized void append(LoggingEvent event) {
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26 super.append(event);
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27 if( file.length() > maxFileSize ) {
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28 rollOver();
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29 }
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30 }
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31
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32 protected void rollOver() {
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33 close();
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34 File backup = new File(fileName+'.'+backups);
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35 if( backup.exists() ) {
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36 if( !backup.delete() )
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37 debug("couldn't delete "+backup);
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38 }
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39 for( int i=backups-1; i>=1; i-- ) {
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40 File f = backup;
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41 backup = new File(fileName+'.'+i);
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42 backup.renameTo(f);
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43 }
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44 if( !file.renameTo(backup) )
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45 debug("couldn't rename "+file+" to "+backup);
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46 try {
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47 open();
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48 } catch(IOException e) {
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49 throw new RuntimeException(e);
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50 }
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51 }
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52
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53 protected void debug(String msg) {
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54 System.err.println("RollingFileAppender: "+msg);
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55 }
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56 }
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