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Nanaloveyuki
75 lines
2.7 KiB
Markdown
75 lines
2.7 KiB
Markdown
---
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name: build-application-logger
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group: api
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category: facade
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update-time: 20260520
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description: Build the application-facing configured logger alias from a LoggerConfig by delegating directly to the normal runtime logger build path.
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key-word:
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- application
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- facade
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- logger
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- public
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---
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## Build-application-logger
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Build an `ApplicationLogger` from `LoggerConfig`. This facade is the application-oriented sync entry point and currently aliases the configured runtime logger shape returned by `build_logger(...)`.
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### Interface
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```moonbit
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pub fn build_application_logger(config : LoggerConfig) -> ApplicationLogger {
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```
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#### input
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- `config : LoggerConfig` - Fully assembled sync logger config.
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#### output
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- `ApplicationLogger` - Application-facing configured runtime logger.
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### Explanation
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Detailed rules explaining key parameters and behaviors
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- This API delegates to `build_logger(...)` directly.
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- The embedded config still goes through the normal runtime logger build path, including runtime sink selection, optional queue wrapping, and timestamp application.
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- Because the result is only the `ApplicationLogger` alias over `ConfiguredLogger`, this builder does not hide any queue, drain, flush, or file runtime helper methods.
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- The returned alias also keeps inherited `Logger` behavior such as `with_target(...)`, `child(...)`, and per-call `target=` overrides on `log(...)`.
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- Use this alias-oriented entrypoint when application boot code wants an app-specific name without changing the underlying configured runtime logger surface.
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### How to Use
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Here are some specific examples provided.
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#### When Need An App-level Sync Builder Entry
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When boot code assembles config values before runtime construction:
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```moonbit
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let logger = build_application_logger(
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LoggerConfig::new(target="app", sink=SinkConfig::new(kind=SinkKind::Console)),
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)
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```
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In this example, the application facade builds the same configured runtime logger shape as `build_logger(...)`.
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And any queue/file/runtime helpers selected by the config remain directly available on the returned alias value.
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The returned value also keeps the ordinary logger target semantics because the facade does not wrap or narrow the underlying `ConfiguredLogger`.
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### Error Case
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e.g.:
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- If the config uses file output on a backend without native file support, backend runtime limitations still apply after construction.
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- If queueing is not configured, queue helper values simply reflect the non-queued runtime shape.
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### Notes
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1. This is a facade API, not a separate runtime implementation.
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2. Use `parse_and_build_application_logger(...)` when starting from JSON text.
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3. Use `build_library_logger(...)` instead when the public surface should intentionally hide configured-runtime helper methods.
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