Mercurial > silverbladetech
annotate Stocks/Stocks.Service/StocksService.cs @ 20:6109bc268b90
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| author | adminsh@apollo |
|---|---|
| date | Tue, 20 Mar 2012 13:37:46 +0000 |
| parents | 6e84a4c92378 |
| children | 399398841fd0 |
| rev | line source |
|---|---|
| 0 | 1 using System; |
| 2 using System.Collections.Generic; | |
| 3 using System.Diagnostics; | |
| 4 using System.Linq; | |
| 5 using System.Threading.Tasks; | |
| 6 using NLog; | |
| 7 using Stocks.Common; | |
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8 using Stocks.Common.Core; |
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9 using Stocks.Common.Events; |
| 0 | 10 using Stocks.Common.Models; |
| 11 | |
| 12 namespace Stocks.Service | |
| 13 { | |
| 14 public class StocksService : IStocksService | |
| 15 { | |
| 16 private static readonly Logger Log = LogManager.GetCurrentClassLogger(); | |
| 17 | |
| 18 private IList<Company> _companies; | |
| 19 private IConfigurationService _configurationService; | |
| 20 private List<Price> _currentPrices; | |
| 21 private string _serviceUrl; | |
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22 private IWebClientShim _webClient; |
| 0 | 23 |
| 24 public bool IsActive { get; private set; } | |
| 25 public SummaryStats Stats { get; private set; } | |
| 26 | |
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27 public StocksService( |
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28 IConfigurationService configurationService, |
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29 IWebClientShim webClientShim) |
| 0 | 30 { |
| 31 new AssemblyInit(); | |
| 32 | |
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33 _webClient = webClientShim; |
| 0 | 34 _configurationService = configurationService; |
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35 Stats = new SummaryStats(); |
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36 |
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37 GetCompanyList(); |
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38 } |
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39 |
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40 private void GetCompanyList() |
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41 { |
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42 _companies = _configurationService.GetCompanies(); |
| 0 | 43 |
| 44 string symbolsCsv = _companies.Select( | |
| 45 c => c.Symbol).Aggregate((c, d) => c + "," + d); | |
| 46 _serviceUrl = _configurationService.GetServiceUrl(symbolsCsv); | |
| 47 } | |
| 48 | |
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49 public event PriceChangedEventHandler PriceChanged; |
| 0 | 50 public delegate void PriceChangedEventHandler(object sender, PriceChangedEventArgs e); |
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51 protected virtual void OnPriceChanged(Price price) |
| 0 | 52 { |
| 53 Stats.PriceChangeEvents++; | |
| 54 | |
| 55 if (PriceChanged != null) | |
| 56 PriceChanged(this, new PriceChangedEventArgs() { Price = price }); | |
| 57 } | |
| 58 | |
| 59 public void Start() | |
| 60 { | |
| 61 PrepareForServiceStarting(); | |
| 62 Task.Factory.StartNew(() => DownloadPrices()); | |
| 63 } | |
| 64 | |
| 65 public void Stop() | |
| 66 { | |
| 67 IsActive = false; | |
| 68 Log.Debug("StockService stopped"); | |
| 69 } | |
| 70 | |
| 71 private void PrepareForServiceStarting() | |
| 72 { | |
| 73 Log.Debug("StockService starting"); | |
| 74 IsActive = true; | |
| 75 Stats.Reset(); | |
| 76 _currentPrices = new List<Price>(_companies.Count); | |
| 77 } | |
| 78 | |
| 79 private void DownloadPrices() | |
| 80 { | |
| 81 try | |
| 82 { | |
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83 Stopwatch timeToDownload; |
| 0 | 84 |
| 85 while (IsActive) | |
| 86 { | |
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87 string webResponse = TimedDelegates.Execute<string>( |
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88 _webClient.DownloadString, |
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89 _serviceUrl, |
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90 out timeToDownload); |
| 0 | 91 |
| 92 PopulatePricesFromWebResponse(webResponse); | |
| 93 UpdateStats(timeToDownload, webResponse); | |
| 94 } | |
| 95 } | |
| 96 catch (Exception e) | |
| 97 { | |
| 98 Log.Error("Exception during DownloadPrices()"); | |
| 99 Log.Error("Stack Trace {0}: /r/nException Message: {1}", e.StackTrace, e.Message); | |
| 100 this.Stop(); | |
| 101 } | |
| 102 } | |
| 103 | |
| 104 private void PopulatePricesFromWebResponse(string webResponse) | |
| 105 { | |
| 106 string[] webPrices = webResponse.Split( | |
| 107 new string[] { "\n", "\r\n" }, | |
| 108 StringSplitOptions.RemoveEmptyEntries); | |
| 109 | |
| 110 foreach (string webPriceData in webPrices) | |
| 111 { | |
| 112 var webPrice = Factory.CreatePrice(webPriceData); | |
| 113 var localPrice = _currentPrices.Find(x => x.Symbol == webPrice.Symbol); | |
| 114 | |
| 115 if (localPrice == null) { | |
| 116 _currentPrices.Add(new Price(webPrice.Symbol, webPrice.CurrentPrice, webPrice.PreviousPrice)); | |
| 117 continue; | |
| 118 } | |
| 119 | |
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120 if (localPrice.Equals(webPrice)) |
| 0 | 121 continue; |
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122 else |
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123 UpdateLocalPrice(webPrice, localPrice); |
| 0 | 124 } |
| 125 } | |
| 126 | |
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127 private void UpdateLocalPrice(Price webPrice, Price localPrice) |
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128 { |
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129 localPrice.PreviousPrice = localPrice.CurrentPrice; |
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130 localPrice.CurrentPrice = webPrice.CurrentPrice; |
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131 OnPriceChanged(localPrice); |
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132 } |
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133 |
| 0 | 134 private void UpdateStats(Stopwatch timeToDownload, string webResponse) |
| 135 { | |
| 136 Stats.LastWebRequest.Duration = (int)timeToDownload.ElapsedMilliseconds; | |
| 137 Stats.LastWebRequest.PricesDownloaded = _currentPrices.Count; | |
| 138 Stats.LastWebRequest.Response = webResponse; | |
| 139 Stats.LastWebRequest.Request = _serviceUrl; | |
| 140 Stats.LastWebRequest.SymbolCount = _companies.Count; | |
| 141 Stats.NumberOfRequests++; | |
| 142 Log.Trace(Stats); | |
| 143 } | |
| 144 } | |
| 145 } |