# Package ch.qos.logback.core.rolling

Implements various file rolling policies.

See: Description

Interface Summary
RollingPolicy: A `RollingPolicy` is responsible for performing the rolling over of the active log file.
TimeBasedFileNamingAndTriggeringPolicy<E>: This interface lists the set of methods that need to be implemented by triggering policies which are nested within a `TimeBasedRollingPolicy`.
TriggeringPolicy<E>: A `TriggeringPolicy` controls the conditions under which roll-over occurs.

Class Summary
DefaultTimeBasedFileNamingAndTriggeringPolicy<E>
FixedWindowRollingPolicy: When rolling over, `FixedWindowRollingPolicy` renames files according to a fixed window algorithm.
RollingFileAppender<E>: `RollingFileAppender` extends `FileAppender` to backup the log files depending on `RollingPolicy` and `TriggeringPolicy`.
RollingPolicyBase: Implements methods common to most, it not all, rolling policies.
SizeAndTimeBasedFNATP<E>
SizeAndTimeBasedRollingPolicy<E>
SizeBasedTriggeringPolicy<E>: SizeBasedTriggeringPolicy looks at size of the file being currently written to.
TimeBasedFileNamingAndTriggeringPolicyBase<E>
TimeBasedRollingPolicy<E>: `TimeBasedRollingPolicy` is both easy to configure and quite powerful.
TriggeringPolicyBase<E>: SizeBasedTriggeringPolicy looks at size of the file being currently written to.

Exception Summary
RolloverFailure: A RolloverFailure occurs if, for whatever reason a rollover fails.

## Package ch.qos.logback.core.rolling Description

Implements various file rolling policies.

The `RollingFileAppender` class serves as the linchpin of this package. Its behaviour is controlled by two subcomponents of type `RollingPolicy` and `TriggeringPolicy`.