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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 import goodjava.io.IoUtils;
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7
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8
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9 public class RollingFileAppender extends WriterAppender {
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10 protected final String fileName;
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11 protected final File file;
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12 public long maxFileSize = 10*1024*1024;
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13 public int backups = 1;
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14
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15 public RollingFileAppender(Layout layout,String fileName) throws IOException {
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16 super(layout,null);
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17 this.fileName = fileName;
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18 this.file = new File(fileName);
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19 open();
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20 }
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21
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22 protected void open() throws IOException {
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23 this.writer = new FileWriter(file,true);
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24 }
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25
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26 public synchronized void append(LoggingEvent event) {
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27 super.append(event);
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28 if( file.length() > maxFileSize ) {
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29 rollOver();
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30 }
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31 }
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32
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33 protected void rollOver() {
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34 close();
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35 File backup = new File(fileName+'.'+backups);
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36 try {
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37 IoUtils.delete(backup);
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38 for( int i=backups-1; i>=1; i-- ) {
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39 File f = backup;
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40 backup = new File(fileName+'.'+i);
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41 IoUtils.move(backup,f);
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42 }
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43 IoUtils.move(file,backup);
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44 open();
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45 } catch(IOException e) {
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46 throw new RuntimeException(e);
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47 }
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48 }
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49 }
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