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annotate src/goodjava/logger/DailyRollingFileAppender.java @ 1710:fc224a1bb6ea

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add blog/serve_and_backup.luan
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 10 Jul 2022 17:52:19 -0600
parents 8a717f0b7f45
children
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1 package goodjava.logger;
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2
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3 import java.io.FileWriter;
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4 import java.io.File;
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5 import java.io.IOException;
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6 import java.text.DateFormat;
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7 import java.util.Date;
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10 public final class DailyRollingFileAppender extends WriterAppender {
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11 private final DateFormat format;
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12 private String fileName;
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13 public long deleteAfter = 0;
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15 public DailyRollingFileAppender(Layout layout,DateFormat format) {
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16 super(layout,null);
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17 this.format = format;
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18 }
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20 public synchronized void append(LoggingEvent event) {
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21 String newFileName = format.format(new Date());
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22 if( !newFileName.equals(fileName) ) {
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23 fileName = newFileName;
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24 if( writer != null )
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25 close();
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26 sweep();
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27 try {
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28 writer = new FileWriter(fileName,true);
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29 } catch(IOException e) {
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30 throw new RuntimeException(e);
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31 }
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32 }
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33 super.append(event);
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34 }
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36 private void sweep() {
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37 if( deleteAfter <= 0 )
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38 return;
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39 long expired = System.currentTimeMillis() - deleteAfter;
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40 File dir = new File(fileName).getParentFile();
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41 for( File file : dir.listFiles() ) {
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42 if( file.lastModified() < expired )
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43 file.delete();
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44 }
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45 }
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46 }