public class DailyRollingFileAppender extends FileAppender
FileAppender so that the
underlying file is rolled over at a user chosen frequency.
DailyRollingFileAppender has been observed to exhibit
synchronization issues and data loss. The log4j extras
companion includes alternatives which should be considered
for new deployments and which are discussed in the documentation
for org.apache.log4j.rolling.RollingFileAppender.
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.
bufferedIO, bufferSize, fileAppend, fileNameencoding, immediateFlush, qwclosed, errorHandler, headFilter, layout, name, tailFilter, threshold| Constructor and Description |
|---|
DailyRollingFileAppender()
The default constructor does nothing.
|
DailyRollingFileAppender(Layout layout,
String filename,
String datePattern)
Instantiate a
DailyRollingFileAppender and open the
file designated by filename. |
| Modifier and Type | Method and Description |
|---|---|
void |
activateOptions()
If the value of File is not
null, then FileAppender.setFile(java.lang.String) is called with the values of File and
Append properties. |
String |
getDatePattern()
Returns the value of the DatePattern option.
|
void |
setDatePattern(String pattern)
The DatePattern takes a string in the same format as
expected by
SimpleDateFormat. |
protected void |
subAppend(LoggingEvent event)
This method differentiates DailyRollingFileAppender from its
super class.
|
closeFile, getAppend, getBufferedIO, getBufferSize, getFile, reset, setAppend, setBufferedIO, setBufferSize, setFile, setFile, setQWForFilesappend, checkEntryConditions, close, closeWriter, createWriter, getEncoding, getImmediateFlush, requiresLayout, setEncoding, setErrorHandler, setImmediateFlush, setWriter, shouldFlush, writeFooter, writeHeaderaddFilter, clearFilters, doAppend, finalize, getErrorHandler, getFilter, getFirstFilter, getLayout, getName, getThreshold, isAsSevereAsThreshold, setLayout, setName, setThresholdpublic DailyRollingFileAppender()
public DailyRollingFileAppender(Layout layout, String filename, String datePattern) throws IOException
DailyRollingFileAppender and open the
file designated by filename. The opened filename will
become the ouput destination for this appender.IOExceptionpublic void setDatePattern(String pattern)
SimpleDateFormat. This options determines the
rollover schedule.public String getDatePattern()
public void activateOptions()
FileAppendernull, then FileAppender.setFile(java.lang.String) is called with the values of File and
Append properties.activateOptions in interface OptionHandleractivateOptions in class FileAppenderprotected void subAppend(LoggingEvent event)
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.
subAppend in class WriterAppenderCopyright © 2015–2017 The veraPDF Consortium. All rights reserved.