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Nanaloveyuki
76 lines
2.3 KiB
Markdown
76 lines
2.3 KiB
Markdown
---
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name: configured-logger-drain
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group: api
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category: runtime
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update-time: 20260613
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description: Drain queued work from a configured runtime logger with optional item limits through RuntimeSink.
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key-word:
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- logger
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- runtime
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- queue
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- public
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---
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## Configured-logger-drain
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Drain queued work from a `ConfiguredLogger`. This helper is the configured logger wrapper over `RuntimeSink::drain(...)` when config-driven queue wrapping should be advanced in a controlled, bounded way.
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### Interface
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```moonbit
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pub fn ConfiguredLogger::drain(self : ConfiguredLogger, max_items~ : Int = -1) -> Int {}
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```
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#### input
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- `self : ConfiguredLogger` - Config-driven runtime logger whose queued work should be drained.
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- `max_items : Int` - Optional upper bound on how many queued items to drain. Negative values mean no explicit bound.
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#### output
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- `Int` - Count returned by the wrapped `RuntimeSink::drain(...)` call.
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### Explanation
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Detailed rules explaining key parameters and behaviors
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- This helper delegates directly to `self.sink.drain(max_items=max_items)`.
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- Queue-wrapped sinks forward to the concrete queue sink's `drain(...)` behavior and may drain up to `max_items` records.
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- Plain file sinks fall back to `FileSink::flush()` behavior through `RuntimeSink` and return `1` or `0`.
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- Plain console-style sinks return `0` because they do not own a drainable queue here.
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### How to Use
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Here are some specific examples provided.
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#### When Need Bounded Queue Progress
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When queued output should be advanced in chunks:
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```moonbit
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let drained = logger.drain(max_items=16)
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```
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In this example, callers limit how much queued work is processed in one step.
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#### When Need Full Manual Drain
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When the configured queue should be emptied explicitly:
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```moonbit
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ignore(logger.drain())
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```
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In this example, the configured runtime logger drains without imposing an item cap.
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### Error Case
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e.g.:
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- If the configured runtime sink is not queue-backed, draining may return `0` or follow the plain-file flush fallback.
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- If callers only need generic flush semantics, `flush()` may be the simpler API.
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### Notes
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1. Prefer this helper when queue progress should be bounded or observable.
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2. Use `pending_count()` to inspect remaining backlog after the drain call when the configured sink is queue-backed.
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