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Nanaloveyuki
83 lines
2.3 KiB
Markdown
83 lines
2.3 KiB
Markdown
---
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name: library-async-logger-child
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group: api
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category: facade
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update-time: 20260613
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description: Derive a child LibraryAsyncLogger facade by composing the current target with a child segment.
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key-word:
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- async
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- library
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- child
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- public
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---
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## Library-async-logger-child
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Create a child `LibraryAsyncLogger[S]` by composing the current target with another target segment. This is the library-facing hierarchical naming helper for async targets such as `sdk.cache` or `plugin.worker.io`.
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### Interface
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```moonbit
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pub fn[S] LibraryAsyncLogger::child(
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self : LibraryAsyncLogger[S],
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target : String,
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) -> LibraryAsyncLogger[S] {
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```
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#### input
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- `self : LibraryAsyncLogger[S]` - Parent facade whose target should be extended.
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- `target : String` - Child target segment or suffix.
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#### output
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- `LibraryAsyncLogger[S]` - New library-facing async facade whose target is the composed child path.
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### Explanation
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Detailed rules explaining key parameters and behaviors
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- This API delegates to the wrapped async logger's `child(...)` behavior and then re-wraps the result.
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- If the parent target is empty, the child target becomes the full target.
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- If the child target is empty, the parent target is preserved.
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- If both are non-empty, they are joined with `.`.
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### How to Use
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Here are some specific examples provided.
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#### When Need Hierarchical Async Naming In A Library API
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When a package wants stable namespace composition without exposing `AsyncLogger[S]`:
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```moonbit
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let worker = LibraryAsyncLogger::new(@bitlogger.console_sink())
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.with_target("plugin")
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.child("worker")
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```
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In this example, the final target becomes `plugin.worker`.
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#### When Build Scoped Async Facades Step By Step
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When deeper target composition should stay readable:
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```moonbit
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let client = LibraryAsyncLogger::new(@bitlogger.console_sink(), target="sdk")
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.child("http")
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.child("client")
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```
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In this example, the final facade emits under `sdk.http.client`.
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### Error Case
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e.g.:
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- If `target` is empty, the returned facade keeps the original parent target.
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- If callers need complete replacement instead of composition, `with_target(...)` should be used instead.
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### Notes
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1. This is the preferred library-facing API for hierarchical async target naming.
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2. Composition changes the target only and does not rebuild the queue or sink.
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