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Nanaloveyuki
72 lines
1.8 KiB
Markdown
72 lines
1.8 KiB
Markdown
---
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name: file-sink-set-rotation
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group: api
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category: sink
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update-time: 20260613
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description: Update the rotation configuration used by a FileSink.
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key-word:
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- file
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- sink
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- rotation
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- public
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---
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## File-sink-set-rotation
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Update the rotation configuration used by a `FileSink`. This helper changes direct runtime file rotation behavior without rebuilding or reopening the sink.
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### Interface
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```moonbit
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pub fn FileSink::set_rotation(self : FileSink, rotation : FileRotation?) -> Unit {
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```
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#### input
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- `self : FileSink` - File sink whose rotation policy should change.
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- `rotation : FileRotation?` - New rotation config, or `None` to disable rotation.
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### Explanation
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Detailed rules explaining key parameters and behaviors
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- This method updates runtime rotation policy only.
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- Passing `None` disables rotation.
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- It does not reopen the sink or rotate immediately by itself.
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- Append and auto-flush settings are left unchanged.
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### How to Use
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Here are some specific examples provided.
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#### When Need Runtime Rotation Tuning
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When a concrete file sink should enable or change rotation dynamically:
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```moonbit
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sink.set_rotation(Some(file_rotation(1024, max_backups=3)))
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```
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In this example, direct runtime rotation behavior is updated without rebuilding the sink.
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#### When Need To Disable Rotation
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When the file sink should stop rotating:
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```moonbit
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sink.set_rotation(None)
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```
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In this example, the sink has its rotation policy cleared explicitly.
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### Error Case
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e.g.:
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- If callers only want to remove rotation, `clear_rotation()` is the more direct API.
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- This helper does not report past rotation failures; use `rotation_failures()` or `state()` for diagnostics.
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### Notes
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1. Use this helper when setting a full runtime rotation config.
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2. It is useful for operational tuning on a concrete file sink without rebuilding it.
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