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view src/goodjava/logger/RollingFileAppender.java @ 1512:31b543826ca9
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author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Sat, 23 May 2020 19:01:57 -0600 |
parents | 6c6ce14db6a8 |
children | 97cc73664ca8 |
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package goodjava.logger; import java.io.File; import java.io.FileWriter; import java.io.IOException; import goodjava.io.IoUtils; public class RollingFileAppender extends WriterAppender { protected final String fileName; protected final File file; public long maxFileSize = 10*1024*1024; public int backups = 1; public RollingFileAppender(Layout layout,String fileName) throws IOException { super(layout,null); this.fileName = fileName; this.file = new File(fileName); open(); } protected void open() throws IOException { this.writer = new FileWriter(file,true); } public synchronized void append(LoggingEvent event) { super.append(event); if( file.length() > maxFileSize ) { rollOver(); } } protected void rollOver() { close(); File backup = new File(fileName+'.'+backups); try { IoUtils.delete(backup); for( int i=backups-1; i>=1; i-- ) { File f = backup; backup = new File(fileName+'.'+i); IoUtils.move(backup,f); } IoUtils.move(file,backup); open(); } catch(IOException e) { throw new RuntimeException(e); } } }