File-rotation-type

FileRotation is the public file sink rotation policy type used for native size-based log file rollover. It is a direct alias to the sink model that stores the byte limit and retained backup count.

Interface

pub type FileRotation = @utils.FileRotation

output

• FileRotation - Public file rotation policy object containing max_bytes and max_backups.

Explanation

Detailed rules explaining key parameters and behaviors

• This is a type alias, not a file sink or rotation trigger by itself.
• The current fields are max_bytes : Int and max_backups : Int.
• file_rotation(...) constructs this type as the main public helper.
• The same value type is consumed by file_sink(...), FileSinkPolicy::new(...), SinkConfig, file runtime inspection APIs, and logger config serialization helpers.

How to Use

Here are some specific examples provided.

When Need A Typed Rotation Policy Value

When rotation settings should be assembled once and reused across file sink setup paths:

let rotation : FileRotation = file_rotation(1024 * 1024, max_backups=3)

In this example, the rollover policy remains a typed value instead of being embedded directly in one sink call.

When Need To Inspect Or Carry Rotation Policy Data

When code should keep rotation settings as structured policy before applying them:

let policy = FileSinkPolicy::new(rotation=Some(file_rotation(4096, max_backups=2)))

In this example, the alias type participates in higher-level file sink policy composition.

Error Case

e.g.:

• FileRotation itself does not have a runtime failure mode.

• A value of this type can still describe rotation behavior that only takes effect on targets where native file support exists.

Notes

1. Use file_rotation(...) when you need a value of this type in code.

2. Use native_files_supported() or the target verification guidance when portability matters across non-native targets.