适配: Edge 全局参数解析 + AlgorithmManager 三级参数合并

algorithms.py

@@ -1556,6 +1556,7 @@ class AlgorithmManager:
         self.working_hours = working_hours or []
         self._update_lock = threading.Lock()
         self._registered_keys: set = set()  # 已注册的 (roi_id, bind_id, algo_type) 缓存
+        self._global_params: Dict[str, Dict] = {}  # 全局参数 {algo_code: params_dict}
 
         # Bug fix: 默认参数与算法构造函数一致
         self.default_params = {
@@ -1598,6 +1599,28 @@ class AlgorithmManager:
         self._pubsub_thread = None
         self._running = False
 
+    def update_global_params(self, global_params_map: Dict[str, Dict]):
+        """更新全局参数
+
+        Args:
+            global_params_map: {algo_code: params_dict} 格式的全局参数
+        """
+        with self._update_lock:
+            self._global_params = global_params_map or {}
+            logger.info(f"全局参数已更新: {list(self._global_params.keys())}")
+
+    def get_min_alarm_duration(self, algorithm_type: str) -> Optional[int]:
+        """从全局参数获取最小告警持续时间（秒）
+
+        Args:
+            algorithm_type: 算法类型（如 leave_post, intrusion）
+
+        Returns:
+            最小告警持续时间秒数，未配置返回 None
+        """
+        gp = self._global_params.get(algorithm_type, {})
+        return gp.get("min_alarm_duration_sec")
+
     def start_config_subscription(self):
         """启动配置变更订阅"""
         try:
@@ -2074,6 +2097,10 @@ class AlgorithmManager:
             self.algorithms[roi_id][key] = {}
 
         algo_params = self.default_params.get(algorithm_type, {}).copy()
+        # 三级合并：默认参数 → 全局参数 → 绑定级参数
+        global_p = self._global_params.get(algorithm_type, {})
+        if global_p:
+            algo_params.update(global_p)
         if params:
             algo_params.update(params)