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Nanaloveyuki
76 lines
2.3 KiB
Markdown
76 lines
2.3 KiB
Markdown
---
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name: runtime-sink-file-flush
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group: api
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category: runtime
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update-time: 20260613
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description: Flush the file sink behind a RuntimeSink when one is present.
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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-flush
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Flush the file sink behind a `RuntimeSink`. This helper is the direct file-specific runtime flush surface for code that owns a sink value instead of a `ConfiguredLogger`.
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### Interface
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```moonbit
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pub fn RuntimeSink::file_flush(self : RuntimeSink) -> Bool {
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```
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#### input
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- `self : RuntimeSink` - Runtime sink whose file sink should be flushed.
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#### output
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- `Bool` - Whether the underlying file flush succeeded.
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### Explanation
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Detailed rules explaining key parameters and behaviors
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- Plain `File` runtime variants forward directly to `FileSink::flush()`.
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- `QueuedFile` runtime variants first attempt `sink.flush()` on the queue wrapper, then call `sink.sink.flush()` on the wrapped file sink.
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- For `QueuedFile`, the queue flush result is ignored and the returned `Bool` comes from the inner file flush.
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- For `QueuedFile`, this step may also be the point where queued records finally reach the inner file sink, so write-failure counters can change here even if earlier `log(...)` calls only enqueued records.
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- Non-file runtime variants return `false`.
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### How to Use
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Here are some specific examples provided.
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#### When Need Explicit Direct File Durability Steps
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When code holds a file-backed `RuntimeSink` directly and should flush it explicitly:
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```moonbit
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ignore(sink.file_flush())
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```
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In this example, the runtime sink attempts to flush its file-backed output directly.
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#### When Need A File-specific Success Flag
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When code should branch on the outcome of a direct file flush:
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```moonbit
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let ok = sink.file_flush()
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```
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In this example, callers can distinguish file flush success from a non-file sink shape.
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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 want generic queue or sink advancement instead of file-specific behavior, `flush()` is the broader API.
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### Notes
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1. Prefer this helper when direct runtime code specifically cares about file flush behavior.
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2. Queued file sinks may perform both queue flush work and file flush work here, including surfacing delayed write failures from previously queued records.
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