org.apache.log4j

Class DailyMaxRollingFileAppender

java.lang.Object

org.apache.log4j.AppenderSkeleton

org.apache.log4j.WriterAppender

org.apache.log4j.FileAppender

org.apache.log4j.DailyMaxRollingFileAppender

All Implemented Interfaces:

org.apache.log4j.Appender, org.apache.log4j.spi.OptionHandler

public class DailyMaxRollingFileAppender
extends org.apache.log4j.FileAppender

========================================= * Customisation done in APB. ==================================
Works only with "'.'YYYY-MM-dd" DatePattern in appender

DailyMaxRollingFileAppender extends FileAppender so that the underlying file is rolled over at a user chosen frequency.

The rolling schedule is specified by the DatePattern. This pattern should follow the SimpleDateFormat conventions. In particular, you must escape literal text within a pair of single quotes. A formatted version of the date pattern is used as the suffix for the rolled file name.

For example, if the File option is set to /foo/bar.log and the DatePattern set to '.'yyyy-MM-dd, on 2001-02-16 at midnight, the logging file /foo/bar.log will be copied to /foo/bar.log.2001-02-16 and logging for 2001-02-17 will continue in /foo/bar.log until it rolls over the next day.

Is is possible to specify monthly, weekly, half-daily, daily, hourly, or minutely rollover schedules.

List of supported schedules

DatePattern	Rollover schedule	Example
'.'yyyy-MM	Rollover at the beginning of each month	At midnight of May 31st, 2002 /foo/bar.log will be copied to /foo/bar.log.2002-05. Logging for the month of June will be output to /foo/bar.log until it is also rolled over the next month.
'.'yyyy-ww	Rollover at the first day of each week. The first day of the week depends on the locale.	Assuming the first day of the week is Sunday, on Saturday midnight, June 9th 2002, the file /foo/bar.log will be copied to /foo/bar.log.2002-23. Logging for the 24th week of 2002 will be output to /foo/bar.log until it is rolled over the next week.
'.'yyyy-MM-dd	Rollover at midnight each day.	At midnight, on March 8th, 2002, /foo/bar.log will be copied to /foo/bar.log.2002-03-08. Logging for the 9th day of March will be output to /foo/bar.log until it is rolled over the next day.
'.'yyyy-MM-dd-a	Rollover at midnight and midday of each day.	At noon, on March 9th, 2002, /foo/bar.log will be copied to /foo/bar.log.2002-03-09-AM. Logging for the afternoon of the 9th will be output to /foo/bar.log until it is rolled over at midnight.
'.'yyyy-MM-dd-HH	Rollover at the top of every hour.	At approximately 11:00.000 o'clock on March 9th, 2002, /foo/bar.log will be copied to /foo/bar.log.2002-03-09-10. Logging for the 11th hour of the 9th of March will be output to /foo/bar.log until it is rolled over at the beginning of the next hour.
'.'yyyy-MM-dd-HH-mm	Rollover at the beginning of every minute.	At approximately 11:23,000, on March 9th, 2001, /foo/bar.log will be copied to /foo/bar.log.2001-03-09-10-22. Logging for the minute of 11:23 (9th of March) will be output to /foo/bar.log until it is rolled over the next minute.

Do not use the colon ":" character in anywhere in the DatePattern option. The text before the colon is interpeted as the protocol specificaion of a URL which is probably not what you want.

You have also to define the maximum number of file are kept before the oldest is erased.

Author:

Eirik Lygre, Ceki Gülcü, Riccardo Nicosia;

Field Summary

Fields inherited from class org.apache.log4j.FileAppender

bufferedIO, bufferSize, fileAppend, fileName

Fields inherited from class org.apache.log4j.WriterAppender

encoding, immediateFlush, qw

Fields inherited from class org.apache.log4j.AppenderSkeleton

closed, errorHandler, headFilter, layout, name, tailFilter, threshold

Constructor Summary

Constructors

Constructor and Description
DailyMaxRollingFileAppender() The default constructor does nothing.
DailyMaxRollingFileAppender(org.apache.log4j.Layout layout, String filename, String datePattern) Instantiate a DailyRollingFileAppender and open the file designated by filename.

Method Summary

Methods

Modifier and Type	Method and Description
void	activateOptions()
String	getDatePattern() Returns the value of the DatePattern option.
int	getMaxBackupIndex() Returns the value of the MaxBackupIndex option.
static void	main(String[] args)
void	setDatePattern(String pattern) The DatePattern takes a string in the same format as expected by SimpleDateFormat.
void	setMaxBackupIndex(int maxBackups) Set the maximum number of backup files to keep around.
protected void	subAppend(org.apache.log4j.spi.LoggingEvent event) This method differentiates DailyRollingFileAppender from its super class.

Methods inherited from class org.apache.log4j.FileAppender

closeFile, getAppend, getBufferedIO, getBufferSize, getFile, reset, setAppend, setBufferedIO, setBufferSize, setFile, setFile, setQWForFiles

Methods inherited from class org.apache.log4j.WriterAppender

append, checkEntryConditions, close, closeWriter, createWriter, getEncoding, getImmediateFlush, requiresLayout, setEncoding, setErrorHandler, setImmediateFlush, setWriter, shouldFlush, writeFooter, writeHeader

Methods inherited from class org.apache.log4j.AppenderSkeleton

addFilter, clearFilters, doAppend, finalize, getErrorHandler, getFilter, getFirstFilter, getLayout, getName, getThreshold, isAsSevereAsThreshold, setLayout, setName, setThreshold

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DailyMaxRollingFileAppender

public DailyMaxRollingFileAppender()

The default constructor does nothing.

DailyMaxRollingFileAppender

public DailyMaxRollingFileAppender(org.apache.log4j.Layout layout,
                           String filename,
                           String datePattern)
                            throws IOException

Instantiate a DailyRollingFileAppender and open the file designated by filename. The opened filename will become the ouput destination for this appender.

Throws:

IOException

Method Detail

setDatePattern

public void setDatePattern(String pattern)

The DatePattern takes a string in the same format as expected by SimpleDateFormat. This options determines the rollover schedule.

getDatePattern

public String getDatePattern()

Returns the value of the DatePattern option.

setMaxBackupIndex

public void setMaxBackupIndex(int maxBackups)

Set the maximum number of backup files to keep around.

The MaxBackupIndex option determines how many backup files are kept before the oldest is erased. This option takes a positive integer value. If set to zero, then there will be no backup files and the log file will be renamed to the value of the scheduledFilename variable when the next interval is entered.

getMaxBackupIndex

public int getMaxBackupIndex()

Returns the value of the MaxBackupIndex option.

activateOptions

public void activateOptions()

Specified by:

activateOptions in interface org.apache.log4j.spi.OptionHandler

Overrides:

activateOptions in class org.apache.log4j.FileAppender

subAppend

protected void subAppend(org.apache.log4j.spi.LoggingEvent event)

This method differentiates DailyRollingFileAppender from its super class.

Before actually logging, this method will check whether it is time to do a rollover. If it is, it will schedule the next rollover time and then rollover.

Overrides:

subAppend in class org.apache.log4j.WriterAppender

main

public static void main(String[] args)