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.
  
  #ifndef _ST_HPC_PPL_NN_ENGINES_ENGINE_IMPL_H_
  #define _ST_HPC_PPL_NN_ENGINES_ENGINE_IMPL_H_
  
  #include "ppl/nn/ir/graph.h"
  #include "ppl/nn/engines/engine.h"
  #include "ppl/nn/engines/engine_context.h"
  
  namespace ppl { namespace nn {
  
  namespace utils {
  struct SharedResource;
  }
  
  struct RuntimePartitionInfo;
  
  /**
     @class EngineImpl
     @brief engine implementation interface
  */
  class EngineImpl : public Engine {
  public:
      /** @param name engine's name */
      EngineImpl(const std::string& name) : name_(name) {}
  
      virtual ~EngineImpl() {}
  
      const char* GetName() const override final {
          return name_.c_str();
      }
  
      /**
         @brief create an `EngineContext` instance for a `Runtime` instance of
         graph named `graph_name`.
      */
      virtual EngineContext* CreateEngineContext(const std::string& graph_name) = 0;
  
      /** @brief tells whether this engine implements `node`. */
      virtual bool Supports(const ir::Node* node) const = 0;
  
      /**
         @brief optimize the compute graph `graph` and fill `info`
         @param graph graph to be optimized and can be modified
         @note DO NOT modify input and output edges
      */
      virtual ppl::common::RetCode ProcessGraph(utils::SharedResource*, ir::Graph* graph, RuntimePartitionInfo* info) = 0;
  
  private:
      const std::string name_;
  };
  
  }} // namespace ppl::nn
  
  #endif
  