mirror of
https://github.com/Nanaloveyuki/BitLogger.git
synced 2026-07-24 00:42:18 +00:00
Nanaloveyuki
80 lines
2.3 KiB
Markdown
80 lines
2.3 KiB
Markdown
---
|
|
name: library-logger-is-enabled
|
|
group: api
|
|
category: facade
|
|
update-time: 20260613
|
|
description: Check whether a LibraryLogger facade would accept a record at a given level.
|
|
key-word:
|
|
- library
|
|
- facade
|
|
- enabled
|
|
- public
|
|
---
|
|
|
|
## Library-logger-is-enabled
|
|
|
|
Check whether a `LibraryLogger[S]` would accept a record at the given level based on its current `min_level`. This is the library-facing counterpart to `Logger::is_enabled(...)` and is useful for gating expensive message preparation.
|
|
|
|
### Interface
|
|
|
|
```moonbit
|
|
pub fn[S] LibraryLogger::is_enabled(self : LibraryLogger[S], level : Level) -> Bool {
|
|
```
|
|
|
|
#### input
|
|
|
|
- `self : LibraryLogger[S]` - Library-facing logger whose current minimum level should be checked.
|
|
- `level : Level` - Candidate severity to test.
|
|
|
|
#### output
|
|
|
|
- `Bool` - `true` when the level is enabled by the facade's current threshold.
|
|
|
|
### Explanation
|
|
|
|
Detailed rules explaining key parameters and behaviors
|
|
|
|
- This method delegates directly to the wrapped logger's `is_enabled(...)` behavior.
|
|
- It only checks logger-level severity gating; it does not evaluate sink filters or patch logic.
|
|
- The result reflects the current facade value, so derived facades with different thresholds can return different answers.
|
|
- Use it when message construction or field gathering is expensive enough to justify a pre-check.
|
|
|
|
### How to Use
|
|
|
|
Here are some specific examples provided.
|
|
|
|
#### When Avoid Expensive Library Debug Preparation
|
|
|
|
When debug data should only be built if needed:
|
|
```moonbit
|
|
if logger.is_enabled(Level::Debug) {
|
|
logger.info(build_summary())
|
|
}
|
|
```
|
|
|
|
In this example, expensive preparation is skipped unless the current threshold allows that severity.
|
|
|
|
#### When Inspect Effective Facade Threshold
|
|
|
|
When package code should branch based on current logger behavior:
|
|
```moonbit
|
|
if logger.is_enabled(Level::Info) {
|
|
logger.info("library path active")
|
|
}
|
|
```
|
|
|
|
In this example, the check mirrors the same severity gate used by later write calls.
|
|
|
|
### Error Case
|
|
|
|
e.g.:
|
|
- If `level` is below the current minimum threshold, the method returns `false`.
|
|
|
|
- A `true` result does not guarantee final sink output if later filter logic rejects the record.
|
|
|
|
### Notes
|
|
|
|
1. This is a cheap severity check, not a full end-to-end delivery guarantee.
|
|
|
|
2. Prefer using it only when precomputing the log payload is meaningfully expensive.
|