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Nanaloveyuki
94 lines
3.1 KiB
Markdown
94 lines
3.1 KiB
Markdown
---
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name: library-async-logger-warn
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group: api
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category: facade
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update-time: 20260614
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description: Enqueue a warning-level record through a LibraryAsyncLogger facade by delegating to the wrapped async logger's warn shortcut.
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key-word:
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- async
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- library
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- warn
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- public
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---
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## Library-async-logger-warn
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Enqueue a warning-level record through the library-facing async logger. This is the convenience wrapper for `log(Level::Warn, ...)` on `LibraryAsyncLogger[S]`.
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### Interface
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```moonbit
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pub async fn[S] LibraryAsyncLogger::warn(
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self : LibraryAsyncLogger[S],
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message : String,
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fields~ : Array[@bitlogger.Field] = [],
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) -> Unit {
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```
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#### input
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- `self : LibraryAsyncLogger[S]` - Library-facing async logger that should receive the warning record.
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- `message : String` - Warning message text.
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- `fields : Array[@bitlogger.Field]` - Optional structured fields added to the record.
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#### output
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- `Unit` - No return value. The record is handled according to logger state and policy.
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### Explanation
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Detailed rules explaining key parameters and behaviors
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- This helper delegates to `warn(...)` on the wrapped async logger, which in turn uses `log(Level::Warn, ...)`.
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- The record is still subject to min-level gating, stored shared context fields, patching, filtering, and overflow policy.
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- This helper does not accept a per-call target override. It uses the facade's stored target unless the facade was derived earlier with `with_target(...)` or `child(...)`.
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- Warning records are useful for degraded but non-fatal runtime conditions.
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- Use this helper when a named warning call is clearer than a raw `log(...)` call.
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- Async state helpers remain on the underlying `AsyncLogger[S]` and require `to_async_logger()` first.
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### How to Use
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Here are some specific examples provided.
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#### When Need Async Degradation Signals In Library Code
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When the system should report a non-fatal problem:
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```moonbit
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logger.warn("retry budget running low")
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```
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In this example, the event is surfaced at warning severity without using the generic `log(...)` form.
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#### When Attach Structured Warning Detail
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When a warning event should include context:
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```moonbit
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logger.warn(
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"queue near capacity",
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fields=[@bitlogger.field("pending", "64")],
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)
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```
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In this example, the warning carries structured operational detail.
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And any shared context fields already stored on the facade are still prepended before these per-call fields.
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And the write still uses the facade's stored target because this shortcut does not take a one-off `target=` override.
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### Error Case
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e.g.:
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- If the logger minimum level is above `Warn`, the record is skipped before enqueue.
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- If the logger is closed or overflow policy prevents acceptance, the write may not become a normal queued record.
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- If callers need a per-call target override, they should use `log(...)` instead of this fixed-level shortcut.
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### Notes
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1. Use this helper for notable but non-fatal async runtime conditions.
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2. Pair warnings with structured fields when operators need quick context.
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3. Use `to_async_logger()` first when later code needs queue or failure inspection rather than another write shortcut.
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