✨ Add bundled file policy setters

bitlogger/BitLogger_test.mbt

@@ -401,11 +401,45 @@ test "configured logger reset policy restores configured file defaults" {
   ignore(logger.close())
 }
 
+test "configured logger set policy applies bundled runtime file policy" {
+  let logger = build_logger(
+    LoggerConfig::new(
+      sink=SinkConfig::new(kind=SinkKind::File, path="config-set-policy.log"),
+    ),
+  )
+  let default_policy = logger.file_default_policy()
+  inspect(
+    logger.file_set_policy(
+      FileSinkPolicy::new(
+        append=false,
+        auto_flush=false,
+        rotation=Some(file_rotation(22, max_backups=3)),
+      ),
+    ),
+    content="true",
+  )
+  let policy = logger.file_policy()
+  inspect(policy.append, content="false")
+  inspect(policy.auto_flush, content="false")
+  match policy.rotation {
+    Some(rotation) => {
+      inspect(rotation.max_bytes, content="22")
+      inspect(rotation.max_backups, content="3")
+    }
+    None => inspect(false, content="true")
+  }
+  inspect(default_policy.append, content="true")
+  inspect(default_policy.auto_flush, content="true")
+  inspect(default_policy.rotation is None, content="true")
+  ignore(logger.close())
+}
+
 test "configured non-file logger cannot reset file policy" {
   let logger = build_logger(LoggerConfig::new(sink=SinkConfig::new(kind=SinkKind::Console)))
   inspect(logger.file_reset_policy(), content="false")
   inspect(logger.file_policy().append, content="false")
   inspect(logger.file_default_policy().append, content="false")
+  inspect(logger.file_set_policy(FileSinkPolicy::new()), content="false")
 }
 
 test "configured logger can reopen built file sink" {

bitlogger/BitLogger_wbtest.mbt

@@ -194,6 +194,31 @@ test "file sink reset policy restores configured defaults" {
   }
 }
 
+test "file sink set policy applies bundled runtime policy" {
+  let sink = file_sink("bitlogger-set-policy.log")
+  let default_policy = sink.default_policy()
+  sink.set_policy(
+    FileSinkPolicy::new(
+      append=false,
+      auto_flush=false,
+      rotation=Some(file_rotation(18, max_backups=2)),
+    ),
+  )
+  let policy = sink.policy()
+  inspect(policy.append, content="false")
+  inspect(policy.auto_flush, content="false")
+  match policy.rotation {
+    Some(rotation) => {
+      inspect(rotation.max_bytes, content="18")
+      inspect(rotation.max_backups, content="2")
+    }
+    None => inspect(false, content="true")
+  }
+  inspect(default_policy.append, content="true")
+  inspect(default_policy.auto_flush, content="true")
+  inspect(default_policy.rotation is None, content="true")
+}
+
 test "file sink tracks rotation failures on unavailable backend" {
   let sink = file_sink("bitlogger-rotate.log", rotation=Some(file_rotation(1, max_backups=1)))
   sink.write(record(Level::Info, "a"))

bitlogger/README.mbt.md

@@ -243,6 +243,7 @@ test {
 - `rotation_enabled()` and `rotation_config()` expose whether rotation is active and which settings are currently applied / `rotation_enabled()` 与 `rotation_config()` 可读取 rotation 是否启用及当前配置参数
 - `state()` exposes a single file-sink snapshot including path, availability, append policy, auto-flush, rotation config, and failure counters / `state()` 可一次性读取包含 path、availability、append、auto-flush、rotation 配置与失败计数的 file sink 快照
 - `policy()` and `default_policy()` expose the current runtime policy and the sink's original defaults separately / `policy()` 与 `default_policy()` 可分别读取当前运行期策略与 sink 初始默认策略
+- `set_policy(...)` applies append, auto-flush, and rotation as a bundled runtime update / `set_policy(...)` 可将 append、auto-flush、rotation 作为一组运行期策略一次性写回
 - `reset_failure_counters()` clears the open/write/flush/rotation counters after diagnostics or recovery / `reset_failure_counters()` 可在排障或恢复后清空 open/write/flush/rotation 失败计数
 - `reset_policy()` restores append, auto-flush, and rotation back to the sink's original defaults / `reset_policy()` 可将 append、auto-flush、rotation 恢复到 sink 初始默认策略
 - `file_sink_state_to_json(...)` / `stringify_file_sink_state(...)` and `runtime_file_state_to_json(...)` / `stringify_runtime_file_state(...)` export snapshots as JSON / `file_sink_state_to_json(...)` / `stringify_file_sink_state(...)` 与 `runtime_file_state_to_json(...)` / `stringify_runtime_file_state(...)` 可将快照直接导出为 JSON
@@ -251,6 +252,7 @@ test {
 - `ConfiguredLogger` also forwards file reopen, flush, close, append-mode, path, auto-flush, rotation-config, state snapshot, append setter, policy setter, and failure-counter helpers for config-built file sinks / `ConfiguredLogger` 也会为配置生成的 file sink 转发 reopen、flush、close、append-mode、path、auto-flush、rotation 配置、state 快照、append setter、策略 setter 与失败计数访问器
 - `ConfiguredLogger::file_runtime_state()` also reports whether a file sink is queue-wrapped and exposes the outer queue pending/drop counters together with the inner file snapshot / `ConfiguredLogger::file_runtime_state()` 还可报告 file sink 是否被 queue 包装，并将外层 queue 的 pending/drop 计数与内层 file 快照一起返回
 - `ConfiguredLogger::file_policy()` and `ConfiguredLogger::file_default_policy()` also expose current runtime policy and initial config policy separately / `ConfiguredLogger::file_policy()` 与 `ConfiguredLogger::file_default_policy()` 也可分别读取当前运行期策略与初始配置策略
+- `ConfiguredLogger::file_set_policy()` also applies a bundled runtime file policy through the config-built control surface / `ConfiguredLogger::file_set_policy()` 也可通过配置式控制面一次性写回 bundled file 策略
 - `ConfiguredLogger::file_reset_failure_counters()` also clears file failure counters through the config-built control surface / `ConfiguredLogger::file_reset_failure_counters()` 也可通过配置式控制面清空 file 失败计数
 - `ConfiguredLogger::file_reset_policy()` also restores runtime file policy back to the initial config values / `ConfiguredLogger::file_reset_policy()` 也可将运行期 file 策略恢复到初始配置值
 - current scope is observability-first, not a full self-healing sink runtime / 当前定位仍以可观测性优先，不是完整自愈型 sink runtime

bitlogger/config.mbt

@@ -388,6 +388,20 @@ pub fn RuntimeSink::file_set_auto_flush(self : RuntimeSink, enabled : Bool) -> B
   }
 }
 
+pub fn RuntimeSink::file_set_policy(self : RuntimeSink, policy : FileSinkPolicy) -> Bool {
+  match self {
+    File(sink) => {
+      sink.set_policy(policy)
+      true
+    }
+    QueuedFile(sink) => {
+      sink.sink.set_policy(policy)
+      true
+    }
+    _ => false
+  }
+}
+
 pub fn RuntimeSink::file_set_rotation(self : RuntimeSink, rotation : FileRotation?) -> Bool {
   match self {
     File(sink) => {
@@ -617,6 +631,10 @@ pub fn ConfiguredLogger::file_set_auto_flush(self : ConfiguredLogger, enabled :
   self.sink.file_set_auto_flush(enabled)
 }
 
+pub fn ConfiguredLogger::file_set_policy(self : ConfiguredLogger, policy : FileSinkPolicy) -> Bool {
+  self.sink.file_set_policy(policy)
+}
+
 pub fn ConfiguredLogger::file_set_rotation(
   self : ConfiguredLogger,
   rotation : FileRotation?,

bitlogger/sinks.mbt

@@ -198,6 +198,12 @@ pub fn FileSink::set_auto_flush(self : FileSink, enabled : Bool) -> Unit {
   self.auto_flush.val = enabled
 }
 
+pub fn FileSink::set_policy(self : FileSink, policy : FileSinkPolicy) -> Unit {
+  self.append.val = policy.append
+  self.auto_flush.val = policy.auto_flush
+  self.rotation.val = policy.rotation
+}
+
 pub fn FileSink::set_rotation(self : FileSink, rotation : FileRotation?) -> Unit {
   self.rotation.val = rotation
 }