BitLogger/docs/examples/async.md

Async Logger Lifecycle

Use the async package when a native application needs logging to run through an async queue. The library supports broader targets, but the shipped async fn main example is native-focused.

Import Both Packages

import {
  "Nanaloveyuki/BitLogger/src" @log,
  "Nanaloveyuki/BitLogger/src-async" @async_log,
  "moonbitlang/async",
}

Build, Run, Then Shut Down

async fn main {
  let raw = "{\"logger\":{\"min_level\":\"info\",\"target\":\"service.async\",\"sink\":{\"kind\":\"text_console\"}},\"async_config\":{\"max_pending\":64,\"overflow\":\"DropOldest\",\"max_batch\":16,\"linger_ms\":5,\"flush\":\"Batch\"}}"
  let config = @async_log.parse_async_logger_build_config_text(raw) catch {
    err => {
      ignore(err)
      return
    }
  }
  let logger = @async_log.build_async_logger(config)

  @async.with_task_group(group => {
    group.spawn_bg(allow_failure=true, () => logger.run())
    logger.info("worker started", fields=[@log.field("mode", "async")])
    logger.shutdown()
  })
}

run() owns the worker loop. Start it before producing records, then call shutdown() so pending work can follow the configured flush policy.

Run The Repository Example

moon run examples/async_basic --target native

Next Steps

• Inspect queue policy and flush choices in Queueing.
• Reference: parse_async_logger_build_config_text(...), build_async_logger(...), run(), and shutdown().