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Nanaloveyuki
79 lines
2.4 KiB
Markdown
79 lines
2.4 KiB
Markdown
---
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name: queue-config-to-json
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group: api
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category: config
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update-time: 20260512
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description: Convert QueueConfig into a JSON value for export, persistence, or generated config tooling.
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key-word:
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- queue
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- config
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- json
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- public
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---
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## Queue-config-to-json
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Convert a typed `QueueConfig` into a `JsonValue`. This helper is the structured export path for synchronous queue wrapper configuration when callers want machine-readable config output.
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### Interface
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```moonbit
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pub fn queue_config_to_json(queue : QueueConfig) -> @json_parser.JsonValue {}
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```
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#### input
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- `queue : QueueConfig` - Queue wrapper configuration created in code or parsed from config text.
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#### output
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- `JsonValue` - Structured JSON representation of the queue config.
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### Explanation
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Detailed rules explaining key parameters and behaviors
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- The output includes `max_pending` and `overflow`.
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- Overflow is serialized using the supported config labels such as `DropNewest` and `DropOldest`.
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- `max_pending` is emitted as a JSON number and `overflow` is emitted as the stable parser-facing text label, so the result stays aligned with `parse_logger_config_text(...)` roundtrips.
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- This helper is intended for config export rather than runtime queue inspection.
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- The JSON shape matches the queue section accepted by `parse_logger_config_text(...)`.
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### How to Use
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Here are some specific examples provided.
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#### When Need Structured Queue Config Export
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When queue settings should be embedded into a larger JSON payload:
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```moonbit
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let queue_json = queue_config_to_json(
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QueueConfig::new(64, overflow=QueueOverflowPolicy::DropOldest),
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)
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```
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In this example, callers receive a reusable JSON value instead of a final string.
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#### When Need Roundtrip-friendly Config Data
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When code generates queue policy and later persists it:
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```moonbit
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let value = queue_config_to_json(QueueConfig::new(16))
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```
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In this example, the exported shape stays aligned with the supported parser schema.
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### Error Case
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e.g.:
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- If `max_pending` is very small, the config still serializes successfully even though runtime drops may happen more often.
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- If callers need direct text output instead of a JSON value, they should use `stringify_queue_config(...)` instead.
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### Notes
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1. Use this helper when you need a reusable JSON value rather than a final JSON string.
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2. Use `stringify_queue_config(...)` when the next consumer expects text instead of `JsonValue`.
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