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Nanaloveyuki
75 lines
1.9 KiB
Markdown
75 lines
1.9 KiB
Markdown
---
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name: runtime-sink-file-open-failures
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group: api
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category: runtime
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update-time: 20260613
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description: Read the number of open failures recorded by a file-backed RuntimeSink.
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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-open-failures
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Read the number of open failures recorded by a file-backed `RuntimeSink`. This helper is useful for direct runtime diagnostics around file availability and reopen behavior.
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### Interface
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```moonbit
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pub fn RuntimeSink::file_open_failures(self : RuntimeSink) -> Int {
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```
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#### input
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- `self : RuntimeSink` - Runtime sink whose open-failure counter should be inspected.
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#### output
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- `Int` - Number of recorded open failures.
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### Explanation
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Detailed rules explaining key parameters and behaviors
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- Plain `File` runtime variants report the wrapped `FileSink` open-failure count.
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- `QueuedFile` runtime variants forward the metric from the wrapped inner `FileSink`.
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- Non-file runtime variants return `0`.
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- The counter is cumulative until `file_reset_failure_counters()` clears it.
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### How to Use
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Here are some specific examples provided.
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#### When Need File Availability Diagnostics
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When direct runtime support output should show whether file open or reopen failed:
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```moonbit
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let count = sink.file_open_failures()
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```
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In this example, the runtime sink exposes the open-failure metric directly.
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#### When Validate Recovery Logic
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When recovery code should inspect whether reopen attempts failed:
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```moonbit
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ignore(sink.file_open_failures())
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```
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In this example, the counter helps confirm whether file-open problems occurred during runtime.
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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 `0`.
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- If callers need the full file status snapshot rather than one counter, `file_state()` is the better API.
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### Notes
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1. Use this helper for focused direct runtime file-open diagnostics.
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2. Pair it with `file_reopen(...)` and `file_available()` during recovery analysis.
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