text: // Licensed to the Apache Software Foundation (ASF) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The ASF licenses this file
  // to you under the Apache License, Version 2.0 (the
  // "License"); you may not use this file except in compliance
  // with the License.  You may obtain a copy of the License at
  //
  //   http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing,
  // software distributed under the License is distributed on an
  // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  // KIND, either express or implied.  See the License for the
  // specific language governing permissions and limitations
  // under the License.
  
  #pragma once
  
  #include <yaml-cpp/yaml.h>
  #include <string>
  
  #include "ConfigMgr.h"
  #include "utils/Status.h"
  
  namespace milvus {
  namespace server {
  
  class YamlConfigMgr : public ConfigMgr {
   public:
      static ConfigMgr*
      GetInstance() {
          static YamlConfigMgr mgr;
          return &mgr;
      }
  
      virtual Status
      LoadConfigFile(const std::string& filename);
  
      virtual void
      Print() const;
  
      virtual std::string
      DumpString() const;
  
      virtual const ConfigNode&
      GetRootNode() const;
  
      virtual ConfigNode&
      GetRootNode();
  
   private:
      bool
      SetConfigValue(const YAML::Node& node, const std::string& key, ConfigNode& config);
  
      bool
      SetChildConfig(const YAML::Node& node, const std::string& child_name, ConfigNode& config);
  
      bool
      SetSequence(const YAML::Node& node, const std::string& child_name, ConfigNode& config);
  
      void
      LoadConfigNode(const YAML::Node& node, ConfigNode& config);
  
   private:
      YAML::Node node_;
      ConfigNode config_;
  };
  
  }  // namespace server
  }  // namespace milvus
  