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annotate src/goodjava/logger/RollingFileAppender.java @ 1682:97cc73664ca8

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improve RollingFileAppender
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 05 Jun 2022 10:51:43 -0600
parents 6c6ce14db6a8
children
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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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9 public class RollingFileAppender extends WriterAppender {
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10 protected final String[] fileNames;
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11 protected final File file;
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12 public long maxFileSize = 10*1024*1024;
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14 public RollingFileAppender(Layout layout,String[] fileNames) throws IOException {
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15 super(layout,null);
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16 this.fileNames = fileNames;
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17 this.file = new File(fileNames[0]);
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18 open();
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19 }
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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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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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32 protected void rollOver() {
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33 close();
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34 File backup = new File(fileNames[fileNames.length-1]);
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35 try {
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36 IoUtils.delete(backup);
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37 for( int i=fileNames.length-2; i>=1; i-- ) {
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38 File f = backup;
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39 backup = new File(fileNames[i]);
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40 IoUtils.move(backup,f);
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41 }
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42 IoUtils.move(file,backup);
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43 open();
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44 } catch(IOException e) {
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45 throw new RuntimeException(e);
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46 }
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47 }
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48 }