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Nanaloveyuki
84 lines
2.2 KiB
Markdown
84 lines
2.2 KiB
Markdown
---
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name: async-logger-trace
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group: api
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category: async
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update-time: 20260512
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description: Enqueue a trace-level record through the async logger using the lowest built-in severity shortcut.
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key-word:
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- async
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- logger
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- trace
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- public
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---
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## Async-logger-trace
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Enqueue a trace-level record through the async logger. This is the convenience wrapper for `log(Level::Trace, ...)`.
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### Interface
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```moonbit
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pub async fn[S] AsyncLogger::trace(
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self : AsyncLogger[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 : AsyncLogger[S]` - Async logger that should receive the trace record.
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- `message : String` - Trace message text.
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- `fields : Array[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 `log(Level::Trace, ...)`.
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- The record is still subject to min-level gating, patching, filtering, and overflow policy.
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- Trace records are often skipped in production because they are the lowest built-in severity.
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- Use this helper when explicit trace intent is clearer than a raw `log(...)` call.
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### How to Use
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Here are some specific examples provided.
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#### When Need Fine-grained Async Diagnostics
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When low-level execution flow should be observable during debugging:
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```moonbit
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await logger.trace("entered reconciliation step")
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```
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In this example, the call site makes trace intent explicit.
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#### When Attach Structured Trace Data
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When a trace event should carry extra fields:
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```moonbit
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await logger.trace(
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"cache probe",
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fields=[@bitlogger.field("key", "user:42")],
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)
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```
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In this example, the record stays lightweight while still carrying structured detail.
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### Error Case
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e.g.:
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- If the logger minimum level is above `Trace`, 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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### Notes
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1. Prefer this helper when trace intent is more readable than `log(Level::Trace, ...)`.
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2. Trace-level async logging can increase queue pressure quickly under verbose workloads.
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