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# DailyRollingFileAppender Class Reference

Inherits RollingFileAppenderSkeleton.

List of all members.

## Detailed Description

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.

## Public Member Functions

| DailyRollingFileAppender ()
| The default constructor simply calls its parents constructor.
| DailyRollingFileAppender (const LayoutPtr &layout, const LogString &filename, const LogString &datePattern)
| Instantiate a DailyRollingFileAppender and open the file designated by `filename`.
void | setDatePattern (const LogString &pattern)
| The DatePattern takes a string in the same format as expected by SimpleDateFormat.
LogString | getDatePattern ()
| Returns the value of the DatePattern option.
void | setOption (const LogString &option, const LogString &value)
| Set `option` to `value`.
void | activateOptions (log4cxx::helpers::Pool &)
| Prepares DailyRollingFileAppender for use.

## Constructor & Destructor Documentation

DailyRollingFileAppender | ( |  | ) |

| The default constructor simply calls its parents constructor.

DailyRollingFileAppender | ( | const LayoutPtr & | layout,
|  | const LogString & | filename,
|  | const LogString & | datePattern
| ) |

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

## Member Function Documentation

void activateOptions | ( | log4cxx::helpers::Pool & |  | ) | `[virtual]`

| Prepares DailyRollingFileAppender for use. Reimplemented from RollingFileAppenderSkeleton.

LogString getDatePattern | ( |  | ) |

| Returns the value of the DatePattern option.

void setDatePattern | ( | const LogString & | pattern | ) |

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

void setOption | ( | const LogString & | option,
|  | const LogString & | value
| ) | `[virtual]`

| Set `option` to `value`. The handling of each option depends on the OptionHandler instance. Some options may become active immediately whereas other may be activated only when activateOptions is called. Reimplemented from FileAppender.

The documentation for this class was generated from the following file:

- dailyrollingfileappender.h