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annotate Stocks/Stocks.Service/StocksService.cs @ 23:399398841fd0

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Working version for Stocks (including loosely coupled components
author adminsh@apollo
date Tue, 20 Mar 2012 16:53:29 +0000
parents 6e84a4c92378
children
rev   line source
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1 using System;
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2 using System.Collections.Generic;
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3 using System.Diagnostics;
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4 using System.Linq;
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5 using System.Threading.Tasks;
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6 using NLog;
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7 using Stocks.Common;
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8 using Stocks.Common.Core;
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9 using Stocks.Common.Events;
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10 using Stocks.Common.Models;
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11
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12 namespace Stocks.Service
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13 {
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14 public class StocksService : IStocksService
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15 {
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16 #region Delegates
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18 public delegate void PriceChangedEventHandler(object sender, PriceChangedEventArgs e);
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20 #endregion
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21
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22 private static readonly Logger Log = LogManager.GetCurrentClassLogger();
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24 private readonly IConfigurationService _configurationService;
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25 private readonly IWebClientShim _webClient;
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26 private IList<Company> _companies;
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27 private List<Price> _currentPrices;
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28 private string _serviceUrl;
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29
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30 public StocksService(
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31 IConfigurationService configurationService,
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32 IWebClientShim webClientShim)
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33 {
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34 new AssemblyInit();
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36 _webClient = webClientShim;
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37 _configurationService = configurationService;
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38 Stats = new SummaryStats();
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40 GetCompanyList();
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41 }
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43 public SummaryStats Stats { get; private set; }
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44
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45 #region IStocksService Members
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47 public bool IsActive { get; private set; }
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48
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49 public void Start()
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50 {
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51 PrepareForServiceStarting();
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52 Task.Factory.StartNew(DownloadPrices);
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53 }
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55 public void Stop()
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56 {
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57 IsActive = false;
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58 Log.Debug("StockService stopped");
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59 }
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60
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61 #endregion
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62
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63 private void GetCompanyList()
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64 {
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65 _companies = _configurationService.GetCompanies();
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66
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67 string symbolsCsv = _companies.Select(
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68 c => c.Symbol).Aggregate((c, d) => c + "," + d);
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70 _serviceUrl = _configurationService.GetServiceUrl(symbolsCsv);
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71 }
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72
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73 public event PriceChangedEventHandler PriceChanged;
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75 protected virtual void OnPriceChanged(Price price)
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76 {
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77 Stats.PriceChangeEvents++;
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79 if (PriceChanged != null)
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80 PriceChanged(this, new PriceChangedEventArgs {Price = price});
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81 }
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83 private void PrepareForServiceStarting()
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84 {
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85 Log.Debug("StockService starting");
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86 IsActive = true;
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87 Stats.Reset();
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88 _currentPrices = new List<Price>(_companies.Count);
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89 }
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90
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91 private void DownloadPrices()
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92 {
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93 try
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94 {
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95 while (IsActive)
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96 {
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97 Stopwatch timeToDownload;
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98 string webResponse = TimedDelegates.Execute(
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99 _webClient.DownloadString,
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100 _serviceUrl,
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101 out timeToDownload);
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102
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103 PopulatePricesFromWebResponse(webResponse);
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104 UpdateStats(timeToDownload, webResponse);
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105 }
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106 }
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107 catch (Exception e)
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108 {
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109 Log.Error("Exception during DownloadPrices()");
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110 Log.Error("Stack Trace {0}: /r/nException Message: {1}", e.StackTrace, e.Message);
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111 Stop();
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112 }
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113 }
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115 private void PopulatePricesFromWebResponse(string webResponse)
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116 {
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117 string[] webPrices = webResponse.Split(
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118 new[] {"\n", "\r\n"},
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119 StringSplitOptions.RemoveEmptyEntries);
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120
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121 foreach (string webPriceData in webPrices)
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122 {
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123 Price webPrice = Factory.CreatePrice(webPriceData);
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124 Price localPrice = _currentPrices.Find(x => x.Symbol == webPrice.Symbol);
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125
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126 if (localPrice == null)
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127 {
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128 _currentPrices.Add(new Price(webPrice.Symbol, webPrice.CurrentPrice, webPrice.PreviousPrice));
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129 continue;
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130 }
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131
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132 if (!localPrice.Equals(webPrice))
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133 UpdateLocalPrice(webPrice, localPrice);
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134 }
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135 }
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136
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137 private void UpdateLocalPrice(Price webPrice, Price localPrice)
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138 {
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139 localPrice.PreviousPrice = localPrice.CurrentPrice;
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140 localPrice.CurrentPrice = webPrice.CurrentPrice;
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141 OnPriceChanged(localPrice);
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142 }
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143
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144 private void UpdateStats(Stopwatch timeToDownload, string webResponse)
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145 {
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146 Stats.LastWebRequest.Duration = (int) timeToDownload.ElapsedMilliseconds;
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147 Stats.LastWebRequest.PricesDownloaded = _currentPrices.Count;
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148 Stats.LastWebRequest.Response = webResponse;
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149 Stats.LastWebRequest.Request = _serviceUrl;
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150 Stats.LastWebRequest.SymbolCount = _companies.Count;
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151 Stats.NumberOfRequests++;
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152 Log.Trace(Stats);
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153 }
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154 }
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155 }