annotate Implab/ServiceLocator.cs @ 111:0fdaf280c797 v1

minor fix
author cin
date Wed, 19 Nov 2014 03:18:42 +0400
parents 48763f3b5db8
children b33832ab0262
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1 using System;
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2 using System.Collections.Generic;
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3 using System.Linq;
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4 using System.Web;
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5 using System.Diagnostics;
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6
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7 namespace Implab {
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8 /// <summary>
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9 /// Коллекция сервисов, позволяет регистрировать и получать сервисы.
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10 /// </summary>
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11 public class ServiceLocator: Component, IServiceLocator, IServiceProvider {
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12 // запись об сервисе
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13 struct ServiceEntry {
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14 public object service; // сервис
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15 public bool shared; // признак того, что сервис НЕ нужно освобождать
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16 public Func<object> activator; // активатор сервиса при первом обращении
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17 public List<Type> associated; // ссылки на текущую запись
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18 public Type origin; // ссылка на оригинальную запись о сервисе
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19 }
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20
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21 // словарь существующих сервисов
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22 readonly Dictionary<Type, ServiceEntry> m_services = new Dictionary<Type,ServiceEntry>();
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23
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24 /// <summary>
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25 /// Получает объект предоставляющий сервис <typeparamref name="T"/>.
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26 /// </summary>
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27 /// <typeparam name="T">Тип запрашиваемого сервиса</typeparam>
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28 /// <returns>Объект, реализующий сервис</returns>
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29 /// <exception cref="KeyNotFoundException">Сервис не зарегистрирован</exception>
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30 public T GetService<T>() {
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31 object result;
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32 if (TryGetService(typeof(T), out result))
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33 return (T)result;
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34 throw new ApplicationException (String.Format ("{0} doesn't provide {1} service", this, typeof(T)));
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35 }
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36
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37
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38 /// <summary>
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39 /// Пытается получить указанный сервис, в случае, если компонента не предоставляет требуемый сервис
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40 /// не возникает исключений.
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41 /// </summary>
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42 /// <typeparam name="T">Тип требуемого сервиса.</typeparam>
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43 /// <param name="service">Объект реализующий сервис, или <c>default(T)</c> если такового нет.</param>
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44 /// <returns><c>true</c> - сервис найден, <c>false</c> - сервис не зарегистрирован.</returns>
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45 public bool TryGetService<T>(out T service) {
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46 object result;
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47 if (TryGetService(typeof(T), out result)) {
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48 service = (T)result;
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49 return true;
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50 }
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51 service = default(T);
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52 return false;
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53 }
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54
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55 /// <summary>
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56 /// Получает объект предоставляющий сервис <paramref name="serviceType"/>
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57 /// </summary>
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58 /// <param name="serviceType">Тип запрашиваемого сервиса</param>
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59 /// <returns>Объект, реализующий сервис</returns>
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60 /// <exception cref="KeyNotFoundException">Сервис не зарегистрирован</exception>
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61 public object GetService(Type serviceType) {
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62 object result;
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63 if (TryGetService(serviceType, out result))
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64 return result;
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65 throw new ApplicationException (String.Format ("{0} doesn't provide {1} service", this, serviceType));
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66 }
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67
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68 /// <summary>
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69 /// Пытается получить требуемый сервис или совместимый с ним.
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70 /// </summary>
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71 /// <returns><c>true</c>, если сервис был найден, <c>false</c> в противном случае..</returns>
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72 /// <param name="serviceType">Тип запрашиваемого сервиса.</param>
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73 /// <param name="service">Искомый сервис.</param>
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74 public virtual bool TryGetService(Type serviceType, out object service) {
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75 if (serviceType == null)
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76 throw new ArgumentNullException("serviceType");
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77 AssertNotDisposed();
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78
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79 ServiceEntry se;
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80 if (!m_services.TryGetValue(serviceType, out se)) {
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81 // ищем ближайщий объект, реализующий нужный сервис
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82 Type pt = null;
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83 foreach (var t in m_services.Keys)
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84 if (serviceType.IsAssignableFrom(t) && (pt == null || t.IsAssignableFrom(pt)))
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85 pt = t;
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86
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87 if (pt == null) {
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88 // нет нужного сервиса
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89 service = null;
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90 return false;
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91 }
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92
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93 var pe = m_services[pt];
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94
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95 // найденная запись может ссылаться на оригинальную запись с сервисом
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96 if(pe.origin != null) {
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97 pt = pe.origin;
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98 pe = m_services[pt];
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99 }
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100
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101 // добавляем список с обратными ссылками
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102 if (pe.associated == null)
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103 pe.associated = new List<Type>();
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104
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105 pe.associated.Add(serviceType);
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106
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107 // обновляем родительскую запись
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108 m_services[pt] = pe;
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109
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110 // создаем запись со ссылкой
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111 se = new ServiceEntry {
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112 service = pe.service,
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113 origin = pt,
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114 shared = true // предотвращаем множественные попытки освобождения
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115 };
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116
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117 m_services[serviceType] = se;
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118 }
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119
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120 // запись содержит в себе информацию о сервисе
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121 if (se.service != null) {
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122 service = se.service;
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123 return true;
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124 }
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125
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126 // текущая запись является ссылкой
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127 if (se.origin != null) {
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128 se.service = GetService(se.origin);
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129 m_services[serviceType] = se;
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130 service = se.service;
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131 return true;
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132 }
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133
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134 // текущая запись не является ссылкой и не имеет информации о сервисе
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135 // она должна сожержать информацию об активации
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136 if (se.activator != null) {
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137 se.service = se.activator();
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138
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139 m_services[serviceType] = se;
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140
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141 service = se.service;
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142 return true;
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143 }
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144
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145 service = null;
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146 return false;
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147 }
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148
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149 /// <summary>
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150 /// Регистрирует фабрику для активации сервиса по первому требованию.
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151 /// </summary>
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152 /// <typeparam name="T">Тип регистрируемого сервиса.</typeparam>
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153 /// <param name="activator">Фабрика для создания/получения объекта, предоставляющего сервис.</param>
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154 /// <exception cref="InvalidOperationException">Указанный сервис уже зарегистрирован.</exception>
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155 /// <remarks>При освобождении сервис-локатора, сервисы полученные в результате активации также будут освобождены.</remarks>
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156 public void Register<T>(Func<T> activator) {
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157 if (activator == null)
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158 throw new ArgumentNullException("activator");
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159
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160 AssertNotDisposed();
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161
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162 Unregister(typeof(T));
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163
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164 m_services[typeof(T)] = new ServiceEntry {
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165 activator = () => activator() as object
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166 };
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167 }
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168
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169 /// <summary>
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170 /// Регистрирует объект, предоставляющий сервис.
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171 /// </summary>
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172 /// <typeparam name="T">Тип регистрируемого сервиса.</typeparam>
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173 /// <param name="service">Объект, предоставляющий сервис.</param>
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174 /// <exception cref="InvalidOperationException">Указанный сервис уже зарегистрирован.</exception>
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175 /// <remarks>Сервис-локатором не управляет временем жизни объекта для зарегистрированного сервиса.</remarks>
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176 public void Register<T>(T service) {
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177 Register(service, true);
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178 }
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179
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180 /// <summary>
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181 /// Регистрирует объект, предоставляющий сервис.
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182 /// </summary>
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183 /// <typeparam name="T">Тип регистрируемого сервиса.</typeparam>
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184 /// <param name="service">Объект, предоставляющий сервис.</param>
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185 /// <param name="shared">Признак того, что объект является разделяемым и сервис-локатор не должен его освобождать.</param>
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186 /// <exception cref="InvalidOperationException">Указанный сервис уже зарегистрирован.</exception>
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187 public void Register<T>(T service, bool shared) {
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188 if (service == null)
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189 throw new ArgumentNullException("service");
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190
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191 AssertNotDisposed();
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192
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193 Unregister(typeof(T));
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194
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195 m_services[typeof(T)] = new ServiceEntry { service = service, shared = shared };
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196 }
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197
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198 public void Unregister(Type serviceType) {
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199 if (serviceType == null)
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200 throw new ArgumentNullException("serviceType");
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201
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202 AssertNotDisposed();
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203
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204 ServiceEntry se;
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205 if (m_services.TryGetValue(serviceType, out se)) {
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206 // освобождаем ресурсы
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207 if (se.service != null && !se.shared)
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208 ((IDisposable)se.service).Dispose();
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209 m_services.Remove(serviceType);
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210
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211 // убираем связанные записи
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212 if (se.associated != null)
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213 foreach (var item in se.associated)
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214 m_services.Remove(item);
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215 }
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216 }
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217
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218 /// <summary>
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219 /// Освобождает зарегистрированные сервисы (которые требуется освобоить).
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220 /// </summary>
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221 /// <param name="disposing">Призанак того, что нужно освободить ресурсы.</param>
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222 protected override void Dispose(bool disposing) {
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223 if (disposing) {
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224
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225 foreach (var entry in m_services.Values)
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226 if (!entry.shared && entry.service is IDisposable)
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227 ((IDisposable)entry.service).Dispose();
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228
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229 }
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230 base.Dispose(disposing);
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231 }
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232 }
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233 }