annotate Implab/Components/ServiceLocator.cs @ 196:40d7fed4a09e

fixed promise chaining behavior, the error handler doesn't handle result or cancellation handlers exceptions these exceptions are propagated to the next handlers.
author cin
date Mon, 29 Aug 2016 23:15:51 +0300
parents 240aa6994018
children bdfdba6b645b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 using System;
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2 using System.Collections.Generic;
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3
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4 namespace Implab.Components {
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5 /// <summary>
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6 /// Коллекция сервисов, позволяет регистрировать и получать сервисы.
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7 /// </summary>
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8 public class ServiceLocator: Disposable, IServiceLocator, IServiceProvider {
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9 // запись о сервисе
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10 struct ServiceEntry : IDisposable {
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11 public object service; // сервис
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12 public bool shared; // признак того, что сервис НЕ нужно освобождать
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13 public Func<object> activator; // активатор сервиса при первом обращении
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14 public Action<object> cleanup; // функция для очистки сервиса
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15 public List<Type> associated; // ссылки на текущую запись
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16 public Type origin; // ссылка на оригинальную запись о сервисе
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17
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18 #region IDisposable implementation
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19
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20 public void Dispose() {
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21 if (shared)
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22 return;
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23 if (cleanup != null) {
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24 if (service != null)
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25 cleanup(service);
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26 } else
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27 Safe.Dispose(service);
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28 }
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29
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30 #endregion
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31 }
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32
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33 // словарь существующих сервисов
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34 readonly Dictionary<Type, ServiceEntry> m_services = new Dictionary<Type,ServiceEntry>();
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35
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36 /// <summary>
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37 /// Получает объект предоставляющий сервис <typeparamref name="T"/>.
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38 /// </summary>
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39 /// <typeparam name="T">Тип запрашиваемого сервиса</typeparam>
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40 /// <returns>Объект, реализующий сервис</returns>
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41 /// <exception cref="KeyNotFoundException">Сервис не зарегистрирован</exception>
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42 public T GetService<T>() {
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43 object result;
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44 if (TryGetService(typeof(T), out result))
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45 return (T)result;
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46 throw new ApplicationException (String.Format ("{0} doesn't provide {1} service", this, typeof(T)));
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47 }
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48
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49
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50 /// <summary>
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51 /// Пытается получить указанный сервис, в случае, если компонента не предоставляет требуемый сервис
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52 /// не возникает исключений.
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53 /// </summary>
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54 /// <typeparam name="T">Тип требуемого сервиса.</typeparam>
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55 /// <param name="service">Объект реализующий сервис, или <c>default(T)</c> если такового нет.</param>
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56 /// <returns><c>true</c> - сервис найден, <c>false</c> - сервис не зарегистрирован.</returns>
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57 public bool TryGetService<T>(out T service) {
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58 object result;
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59 if (TryGetService(typeof(T), out result)) {
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60 service = (T)result;
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61 return true;
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62 }
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63 service = default(T);
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64 return false;
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65 }
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66
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67 /// <summary>
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68 /// Получает объект предоставляющий сервис <paramref name="serviceType"/>
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69 /// </summary>
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70 /// <param name="serviceType">Тип запрашиваемого сервиса</param>
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71 /// <returns>Объект, реализующий сервис</returns>
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72 /// <exception cref="KeyNotFoundException">Сервис не зарегистрирован</exception>
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73 public object GetService(Type serviceType) {
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74 object result;
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75 if (TryGetService(serviceType, out result))
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76 return result;
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77 throw new ApplicationException (String.Format ("{0} doesn't provide {1} service", this, serviceType));
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78 }
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79
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80 /// <summary>
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81 /// Пытается получить требуемый сервис или совместимый с ним.
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82 /// </summary>
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83 /// <returns><c>true</c>, если сервис был найден, <c>false</c> в противном случае..</returns>
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84 /// <param name="serviceType">Тип запрашиваемого сервиса.</param>
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85 /// <param name="service">Искомый сервис.</param>
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86 public virtual bool TryGetService(Type serviceType, out object service) {
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87 Safe.ArgumentNotNull(serviceType, "serviceType");
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88 AssertNotDisposed();
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89
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90 ServiceEntry se;
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91 if (!m_services.TryGetValue(serviceType, out se)) {
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92 // ищем ближайщий объект, реализующий нужный сервис
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93 Type pt = null;
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94 foreach (var t in m_services.Keys)
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95 if (serviceType.IsAssignableFrom(t) && (pt == null || t.IsAssignableFrom(pt)))
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96 pt = t;
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97
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98 if (pt == null) {
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99 // нет нужного сервиса
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100 service = null;
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101 return false;
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102 }
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103
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104 var pe = m_services[pt];
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105
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106 // найденная запись может ссылаться на оригинальную запись с сервисом
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107 if(pe.origin != null) {
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108 pt = pe.origin;
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109 pe = m_services[pt];
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110 }
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111
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112 // добавляем список с обратными ссылками
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113 if (pe.associated == null)
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114 pe.associated = new List<Type>();
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115
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116 pe.associated.Add(serviceType);
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117
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118 // обновляем родительскую запись
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119 m_services[pt] = pe;
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120
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121 // создаем запись со ссылкой
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122 se = new ServiceEntry {
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123 service = pe.service,
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124 origin = pt,
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125 shared = true // предотвращаем множественные попытки освобождения
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126 };
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127
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128 m_services[serviceType] = se;
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129 }
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130
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131 // запись содержит в себе информацию о сервисе
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132 if (se.service != null) {
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133 service = se.service;
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134 return true;
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135 }
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136
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137 // текущая запись является ссылкой
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138 if (se.origin != null) {
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139 se.service = GetService(se.origin);
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140 m_services[serviceType] = se;
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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 // текущая запись не является ссылкой и не имеет информации о сервисе
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146 // она должна сожержать информацию об активации
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147 if (se.activator != null) {
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148 se.service = se.activator();
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149
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150 m_services[serviceType] = se;
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151
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152 service = se.service;
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153 return true;
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154 }
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155
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156 service = null;
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157 return false;
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158 }
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159
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160 /// <summary>
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161 /// Регистрирует фабрику для активации сервиса по первому требованию.
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162 /// </summary>
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163 /// <typeparam name="T">Тип регистрируемого сервиса.</typeparam>
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164 /// <param name="activator">Фабрика для создания/получения объекта, предоставляющего сервис.</param>
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165 /// <param name = "cleanup">Метод для освобождения экземпляра сервиса, будет вызыван при освобождении сервис-локатора.</param>
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166 /// <remarks>При освобождении сервис-локатора, сервисы полученные в результате активации также будут освобождены.</remarks>
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167 public void Register<T>(Func<T> activator, Action<T> cleanup) {
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168 Safe.ArgumentNotNull(activator, "activator");
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169
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170 AssertNotDisposed();
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171
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172 Unregister(typeof(T));
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173
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174 var serviceEntry = new ServiceEntry();
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175 serviceEntry.activator = () => activator();
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176 if (cleanup != null)
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177 serviceEntry.cleanup = instance => cleanup((T)instance);
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178 m_services[typeof(T)] = serviceEntry;
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179 }
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180
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181 public void Register<T>(Func<T> activator) {
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182 Register(activator, null);
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183 }
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184
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185 /// <summary>
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186 /// Регистрирует объект, предоставляющий сервис.
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187 /// </summary>
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188 /// <typeparam name="T">Тип регистрируемого сервиса.</typeparam>
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189 /// <param name="service">Объект, предоставляющий сервис.</param>
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190 /// <exception cref="InvalidOperationException">Указанный сервис уже зарегистрирован.</exception>
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191 /// <remarks>Сервис-локатором не управляет временем жизни объекта для зарегистрированного сервиса.</remarks>
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192 public void Register<T>(T service) {
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193 Register(service, true);
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194 }
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195
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196 /// <summary>
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197 /// Регистрирует объект, предоставляющий сервис. Повторная регистрация отменяет уже существующую.
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198 /// </summary>
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199 /// <typeparam name="T">Тип регистрируемого сервиса.</typeparam>
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200 /// <param name="service">Объект, предоставляющий сервис.</param>
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201 /// <param name="shared">Признак того, что объект является разделяемым и сервис-локатор не должен его освобождать.</param>
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202 public void Register<T>(T service, bool shared) {
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203 Safe.ArgumentNotNull(service, "service");
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204
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205 AssertNotDisposed();
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206
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207 Unregister(typeof(T));
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208
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209 m_services[typeof(T)] = new ServiceEntry { service = service, shared = shared };
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210 }
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211
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212 public void Unregister(Type serviceType) {
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213 Safe.ArgumentNotNull(serviceType, "serviceType");
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214
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215 AssertNotDisposed();
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216
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217 ServiceEntry se;
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218 if (m_services.TryGetValue(serviceType, out se)) {
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219 if (se.origin != null) {
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220 var pe = m_services[se.origin];
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221 pe.associated.Remove(serviceType);
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222 }
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223 // освобождаем ресурсы
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224 se.Dispose();
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225 m_services.Remove(serviceType);
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226
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227 // убираем связанные записи
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228 if (se.associated != null)
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229 foreach (var item in se.associated)
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230 m_services.Remove(item);
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231 }
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232 }
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233
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234 /// <summary>
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235 /// Освобождает зарегистрированные сервисы (которые требуется освобоить).
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236 /// </summary>
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237 /// <param name="disposing">Призанак того, что нужно освободить ресурсы.</param>
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238 protected override void Dispose(bool disposing) {
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239 if (disposing) {
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240
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241 foreach (var entry in m_services.Values)
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242 entry.Dispose();
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243
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244 }
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245 base.Dispose(disposing);
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246 }
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247 }
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248 }