chrome/third_party/mock4js/examples/PriceService.js

   1 /**\r
   2  * PriceCache\r
   3  */\r
   4 function PriceCache() {\r
   5 }\r
   6 \r
   7 PriceCache.prototype = {\r
   8         getCachedPrice: function(instrumentId) {\r
   9         },\r
  10         setCachedPrice: function(instrumentId, price) {\r
  11         }\r
  12 }\r
  13 \r
  14 /**\r
  15  * PriceFetcher\r
  16  */\r
  17 function PriceFetcher() {\r
  18 }\r
  19 \r
  20 PriceFetcher.prototype = {\r
  21         getPriceFromServer: function(instrumentId) {\r
  22         }\r
  23 }\r
  24 \r
  25 \r
  26 /**\r
  27  * PriceService\r
  28  */\r
  29 function PriceService(priceFetcher, priceCache) {\r
  30         this._priceFetcher = priceFetcher;\r
  31         this._priceCache = priceCache;\r
  32 }\r
  33 \r
  34 PriceService.prototype = {\r
  35         getPrice: function(instrumentId) {\r
  36                 var price = this._priceCache.getCachedPrice(instrumentId);\r
  37                 if(price==null) {\r
  38                         price = this._priceFetcher.getPriceFromServer(instrumentId);\r
  39                         this._priceCache.setCachedPrice(instrumentId, price);\r
  40                 }\r
  41                 return price;\r
  42         }\r
  43 }\r