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