text: /***************************************
  ** Tsunagari Tile Engine              **
  ** rc-cache.h                         **
  ** Copyright 2011-2013 Michael Reiley **
  ** Copyright 2011-2019 Paul Merrill   **
  ***************************************/
  
  // **********
  // 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 SRC_CACHE_RC_CACHE_H_
  #define SRC_CACHE_RC_CACHE_H_
  
  #include "util/hashtable.h"
  #include "util/string-view.h"
  #include "util/string.h"
  
  template<typename T>
  class RcCache {
   public:
      T momentaryRequest(StringView name) noexcept;
  
      T lifetimeRequest(StringView name) noexcept;
  
      void momentaryPut(StringView name, T data) noexcept;
  
      void lifetimePut(StringView name, T data) noexcept;
  
      void garbageCollect() noexcept;
  
   private:
      struct CacheEntry {
          T data;
          time_t lastUsed = 0;  // time in milliseconds
      };
  
      Hashmap<String, CacheEntry> map;
  };
  
  #endif  // SRC_CORE_RC_CACHE_H_
  