text: // Copyright 2022 PingCAP, Ltd.
  //
  // Licensed 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 <Flash/Statistics/ExecutorStatisticsBase.h>
  #include <tipb/executor.pb.h>
  
  #include <map>
  
  namespace DB
  {
  class DAGContext;
  
  class ExecutorStatisticsCollector
  {
  public:
      void initialize(DAGContext * dag_context_);
  
      void collectRuntimeDetails();
  
      const std::map<String, ExecutorStatisticsPtr> & getResult() const { return res; }
  
      String resToJson() const;
  
      DAGContext & getDAGContext() const;
  
  private:
      DAGContext * dag_context = nullptr;
  
      std::map<String, ExecutorStatisticsPtr> res;
  
      template <typename T>
      bool doAppend(const String & executor_id, const tipb::Executor * executor)
      {
          if (T::isMatch(executor))
          {
              res[executor_id] = std::make_shared<T>(executor, *dag_context);
              return true;
          }
          return false;
      }
  
      template <typename... Ts>
      bool append(const String & executor_id, const tipb::Executor * executor)
      {
          assert(res.find(executor_id) == res.end());
          return (doAppend<Ts>(executor_id, executor) || ...);
      }
  };
  } // namespace DB