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Nanaloveyuki
86 lines
3.0 KiB
Markdown
86 lines
3.0 KiB
Markdown
---
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name: runtime-sink-file-set-policy
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group: api
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category: runtime
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update-time: 20260707
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description: Apply a bundled runtime file policy update to a file-backed RuntimeSink.
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key-word:
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- runtime
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- sink
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- file
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- public
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---
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## Runtime-sink-file-set-policy
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Apply a bundled runtime file policy update to a `RuntimeSink`. This helper updates append mode, auto-flush, and rotation together through one runtime policy object on direct sink values.
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The input `FileSinkPolicy` value is owned by `src/file_model`; this method belongs to the runtime facade layer and forwards policy mutation through `src/runtime` to file-backed variants that ultimately use `src/file_runtime.FileSink`.
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### Interface
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```moonbit
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pub fn RuntimeSink::file_set_policy(self : RuntimeSink, policy : FileSinkPolicy) -> Bool {
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```
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#### input
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- `self : RuntimeSink` - Runtime sink whose file policy should change.
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- `policy : FileSinkPolicy` - Bundled runtime file policy to apply.
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#### output
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- `Bool` - Whether the policy update was applied.
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### Explanation
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Detailed rules explaining key parameters and behaviors
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- Plain `File` runtime variants update append, auto-flush, and rotation together on the wrapped `FileSink` and return `true`.
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- `QueuedFile` runtime variants forward the policy update to the wrapped inner `FileSink` only when no queued records are pending.
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- The accepted policy object itself is the shared `@file_model.FileSinkPolicy` model, not a runtime-owned concrete type.
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- Non-file runtime variants return `false`.
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- This helper is broader than the single-setting setters because it updates the whole file policy in one call.
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- If a queued file sink still has pending records, the update is rejected and returns `false` so already queued records are not later written under a different policy bundle than the one they were queued under.
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### How to Use
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Here are some specific examples provided.
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#### When Need Bundled Runtime Policy Changes
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When append, flush, and rotation should change together:
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```moonbit
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ignore(sink.file_set_policy(FileSinkPolicy::new(
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append=true,
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auto_flush=false,
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rotation=Some(file_rotation(2048, max_backups=2)),
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)))
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```
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In this example, runtime file behavior is updated as one policy change.
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#### When Apply A Policy Snapshot
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When a previously captured or computed policy should be restored:
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```moonbit
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let ok = sink.file_set_policy(policy)
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```
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In this example, callers can reapply a whole policy object without splitting it into separate setter calls.
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### Error Case
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e.g.:
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- If the runtime sink is not file-backed, the method returns `false`.
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- If callers only need to change one setting, a narrower setter such as `file_set_auto_flush(...)` or `file_set_rotation(...)` may be clearer.
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- If a queued file sink still has pending records, callers should flush or close it first before changing policy.
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### Notes
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1. Use this helper when the runtime policy should be treated as one cohesive object.
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2. On queued file sinks, clear pending records first so policy mutation does not retroactively affect already queued writes.
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