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Nanaloveyuki
81 lines
2.5 KiB
Markdown
81 lines
2.5 KiB
Markdown
---
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name: runtime-sink-file-path
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group: api
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category: runtime
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update-time: 20260707
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description: Read the effective file path used by a file-backed RuntimeSink, with a compatibility fallback for non-file sinks.
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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-path
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Read the effective file path used by a file-backed `RuntimeSink`. This helper is useful for diagnostics, support output, and confirming which direct runtime file sink is active.
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`file_path()` is the compatibility form. For truthful file-semantics detection, prefer `file_path_or_none()`.
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### Interface
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```moonbit
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pub fn RuntimeSink::file_path(self : RuntimeSink) -> String {
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```
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#### input
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- `self : RuntimeSink` - Runtime sink whose file path should be inspected.
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#### output
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- `String` - Effective runtime file path, or an empty string for non-file sinks.
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### Explanation
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Detailed rules explaining key parameters and behaviors
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- Plain `File` runtime variants return their current file path.
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- `QueuedFile` runtime variants forward the wrapped inner file sink path.
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- Non-file runtime variants return an empty string.
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- This fallback keeps older callers source-compatible, but it does not distinguish “not file-backed” from “file-backed with an empty-looking value”.
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- New diagnostic code should prefer `file_path_or_none()` when it must avoid fallback values.
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- This helper is observation-only and does not modify file state.
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### How to Use
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Here are some specific examples provided.
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#### When Need Direct Runtime Path Diagnostics
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When code owns a `RuntimeSink` and should show which file is active:
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```moonbit
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println(sink.file_path())
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```
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In this example, operators can verify the effective destination path directly from the runtime sink.
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#### When Build Support Output From A Runtime Sink
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When application state dumps should include file destination info:
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```moonbit
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let path = sink.file_path()
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```
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In this example, the path can be surfaced without reading broader runtime state.
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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 an empty string.
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- If callers need a truthful file-semantics check, use `file_path_or_none()`.
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- If callers need richer file status than just the path, `file_state_or_none()` or `file_runtime_state()` is the better API.
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### Notes
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1. Use this helper for direct runtime path visibility on `RuntimeSink` values.
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2. Empty string is a compatibility fallback; `file_path_or_none()` is the recommended truthful API.
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