org.apache.hadoop.chukwa.inputtools.log4j

Class ChukwaDailyRollingFileAppender

java.lang.Object

org.apache.log4j.AppenderSkeleton

org.apache.log4j.WriterAppender

org.apache.log4j.FileAppender

org.apache.hadoop.chukwa.inputtools.log4j.ChukwaDailyRollingFileAppender

All Implemented Interfaces:

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

public class ChukwaDailyRollingFileAppender
extends org.apache.log4j.FileAppender

ChukwaDailyRollingFileAppender is a slightly modified version of DailyRollingFileAppender, with modified versions of its subAppend() and rollOver() functions. We would have preferred to sub-class DailyRollingFileAppender but its authors clearly did not intend that to be a viable option since they made too much of the class private or package-private DailyRollingFileAppender extends FileAppender so that the underlying file is rolled over at a user chosen frequency.

The rolling schedule is specified by the DatePattern option. 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.

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.

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
ChukwaDailyRollingFileAppender() The default constructor does nothing.
ChukwaDailyRollingFileAppender(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()
protected boolean	checkEntryConditions() Fix for late-initialisation
protected void	cleanUp()
String	getChukwaClientHostname()
int	getChukwaClientPortNum()
String	getCleanUpRegex()
String	getDatePattern() Returns the value of the DatePattern option.
int	getMaxBackupIndex()
String	getRecordType()
void	setChukwaClientConnectNumRetry(int i)
void	setChukwaClientConnectRetryInterval(long i)
void	setChukwaClientHostname(String chukwaClientHostname)
void	setChukwaClientPortNum(int chukwaClientPortNum)
void	setCleanUpRegex(String cleanUpRegex)
void	setDatePattern(String pattern) The DatePattern takes a string in the same format as expected by SimpleDateFormat.
void	setMaxBackupIndex(int maxBackupIndex)
void	setRecordType(String recordType)
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, close, closeWriter, createWriter, getEncoding, getImmediateFlush, requiresLayout, setEncoding, setErrorHandler, setImmediateFlush, setWriter, 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

ChukwaDailyRollingFileAppender

public ChukwaDailyRollingFileAppender()
                               throws IOException

The default constructor does nothing.

Throws:

IOException

ChukwaDailyRollingFileAppender

public ChukwaDailyRollingFileAppender(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 output 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.

getRecordType

public String getRecordType()

setRecordType

public void setRecordType(String recordType)

activateOptions

public void activateOptions()

Specified by:

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

Overrides:

activateOptions in class org.apache.log4j.FileAppender

getCleanUpRegex

public String getCleanUpRegex()

setCleanUpRegex

public void setCleanUpRegex(String cleanUpRegex)

getMaxBackupIndex

public int getMaxBackupIndex()

setMaxBackupIndex

public void setMaxBackupIndex(int maxBackupIndex)

cleanUp

protected void cleanUp()

checkEntryConditions

protected boolean checkEntryConditions()

Fix for late-initialisation

Overrides:

checkEntryConditions in class org.apache.log4j.WriterAppender

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

getChukwaClientHostname

public String getChukwaClientHostname()

setChukwaClientHostname

public void setChukwaClientHostname(String chukwaClientHostname)

getChukwaClientPortNum

public int getChukwaClientPortNum()

setChukwaClientPortNum

public void setChukwaClientPortNum(int chukwaClientPortNum)

setChukwaClientConnectNumRetry

public void setChukwaClientConnectNumRetry(int i)

setChukwaClientConnectRetryInterval

public void setChukwaClientConnectRetryInterval(long i)