src/readercache.h

   1 /***************************************
   2 ** Tsunagari Tile Engine              **
   3 ** readercache.h                      **
   4 ** Copyright 2011-2013 PariahSoft LLC **
   5 ***************************************/
   6
   7 // **********
   8 // Permission is hereby granted, free of charge, to any person obtaining a copy
   9 // of this software and associated documentation files (the "Software"), to
  10 // deal in the Software without restriction, including without limitation the
  11 // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  12 // sell copies of the Software, and to permit persons to whom the Software is
  13 // furnished to do so, subject to the following conditions:
  14 //
  15 // The above copyright notice and this permission notice shall be included in
  16 // all copies or substantial portions of the Software.
  17 //
  18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  24 // IN THE SOFTWARE.
  25 // **********
  26
  27 #ifndef READERCACHE_H
  28 #define READERCACHE_H
  29
  30 #include <string>
  31 #include <vector>
  32
  33 #include "cache.h"
  34 #include "log.h"
  35
  36 template<class T>
  37 class ReaderCache
  38 {
  39 public:
  40         typedef T (*GenFn)(const std::string& name);
  41
  42         ReaderCache(GenFn fn) : fn(fn) {}
  43
  44         T momentaryRequest(const std::string& name)
  45         {
  46                 T t = cache.momentaryRequest(name);
  47                 if (t)
  48                         return t;
  49
  50                 t = fn(name);
  51                 cache.momentaryPut(name, t);
  52                 return t;
  53         }
  54
  55         T lifetimeRequest(const std::string& name)
  56         {
  57                 T t = cache.lifetimeRequest(name);
  58                 if (t)
  59                         return t;
  60
  61                 t = fn(name);
  62                 cache.lifetimePut(name, t);
  63                 return t;
  64         }
  65
  66         void garbageCollect()
  67         {
  68                 cache.garbageCollect();
  69         }
  70
  71 private:
  72         GenFn fn;
  73
  74         Cache<T> cache;
  75 };
  76
  77 #endif
  78