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