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Nanaloveyuki
76 lines
2.1 KiB
Markdown
76 lines
2.1 KiB
Markdown
---
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name: runtime-sink-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 RuntimeSink with an optional item limit.
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key-word:
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- runtime
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- sink
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- queue
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- public
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---
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## Runtime-sink-drain
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Drain queued work from a `RuntimeSink`. This helper is useful when code owns a runtime sink directly and needs controlled queue progress.
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### Interface
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```moonbit
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pub fn RuntimeSink::drain(self : RuntimeSink, max_items~ : Int = -1) -> Int {
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```
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#### input
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- `self : RuntimeSink` - Runtime sink whose queued work should be drained.
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- `max_items : Int` - Optional upper bound on drained queued items. Negative values mean no explicit bound.
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#### output
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- `Int` - Number of drained items, or the fallback flush count for plain file sinks.
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### Explanation
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Detailed rules explaining key parameters and behaviors
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- Queue-wrapped runtime sinks forward to the wrapped queue sink's `drain(...)` behavior.
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- Plain file runtime sinks fall back to `FileSink::flush()` behavior and return `1` or `0`.
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- Plain console-style runtime sinks return `0` because they do not own a drainable queue.
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- This method is the direct sink-level API used by `ConfiguredLogger::drain(...)`.
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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 direct queue-backed runtime work should be advanced in chunks:
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```moonbit
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let drained = sink.drain(max_items=16)
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```
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In this example, callers cap how much queued work is processed in one step.
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#### When Need Full Manual Drain
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When a runtime queue should be emptied without an explicit item cap:
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```moonbit
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ignore(sink.drain())
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```
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In this example, the runtime sink drains as much queued work as its concrete variant allows.
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### Error Case
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e.g.:
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- If the runtime sink is not queue-backed, the result may be `0` or file-flush fallback behavior.
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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 directly observed.
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2. `ConfiguredLogger::drain(...)` is the higher-level wrapper for config-built loggers.
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