text: /*******************************************************************************
   *
   * MIT License
   *
   * Copyright (c) 2019 Advanced Micro Devices, Inc.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   *
   *******************************************************************************/
  #ifndef MIOPEN_GUARD_MLOPEN_READONLYRAMDB_HPP
  #define MIOPEN_GUARD_MLOPEN_READONLYRAMDB_HPP
  
  #include <miopen/db_record.hpp>
  
  #include <boost/optional.hpp>
  
  #include <unordered_map>
  #include <string>
  #include <sstream>
  
  namespace miopen {
  
  namespace debug {
  extern bool& rordb_embed_fs_override();
  } // namespace debug
  
  class ReadonlyRamDb
  {
  public:
      ReadonlyRamDb(std::string path) : db_path(path) {}
  
      static ReadonlyRamDb& GetCached(const std::string& path, bool warn_if_unreadable);
  
      boost::optional<DbRecord> FindRecord(const std::string& problem) const
      {
          MIOPEN_LOG_I2("Looking for key " << problem << " in file " << db_path);
          const auto it = cache.find(problem);
  
          if(it == cache.end())
              return boost::none;
  
          auto record = DbRecord{problem};
  
          MIOPEN_LOG_I2("Key match: " << problem);
          MIOPEN_LOG_I2("Contents found: " << it->second.content);
  
          if(!record.ParseContents(it->second.content))
          {
              MIOPEN_LOG_E("Error parsing payload under the key: "
                           << problem << " form file " << db_path << "#" << it->second.line);
              MIOPEN_LOG_E("Contents: " << it->second.content);
              return boost::none;
          }
  
          return record;
      }
  
      template <class TProblem>
      boost::optional<DbRecord> FindRecord(const TProblem& problem) const
      {
          const auto key = DbRecord::Serialize(problem);
          return FindRecord(key);
      }
  
      template <class TProblem, class TValue>
      bool Load(const TProblem& problem, const std::string& id, TValue& value) const
      {
          const auto record = FindRecord(problem);
          if(!record)
              return false;
          return record->GetValues(id, value);
      }
  
  private:
      struct CacheItem
      {
          int line;
          std::string content;
      };
  
      std::string db_path;
      std::unordered_map<std::string, CacheItem> cache;
  
      ReadonlyRamDb(const ReadonlyRamDb&) = default;
      ReadonlyRamDb(ReadonlyRamDb&&)      = default;
      ReadonlyRamDb& operator=(const ReadonlyRamDb&) = default;
      ReadonlyRamDb& operator=(ReadonlyRamDb&&) = default;
  
      void Prefetch(bool warn_if_unreadable);
      void ParseAndLoadDb(std::istream& input_stream, bool warn_if_unreadable);
  };
  
  } // namespace miopen
  
  #endif
  