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annotate Implab.ServiceHost/Unity/FactoryElement.cs @ 279:8714471e8d78 v3

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Container configuration cleanup, RC2
author cin
date Fri, 04 May 2018 18:12:42 +0300
parents 6691aff01de1
children e0916ddc9950
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1 using System;
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2 using System.Xml.Serialization;
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3 using Implab.Components;
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4
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5 namespace Implab.ServiceHost.Unity {
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6 /// <summary>
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7 /// Расширяет стандартную регистрацию типа до фабрики, вместе с регистрацией
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8 /// самой фабрики создаются регистрации сервисов, которые она предоставляет.
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9 /// </summary>
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10 public class FactoryElement : RegisterElement, ITypeRegistration {
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11
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12 /// <summary>
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13 /// Записи о сервисах, которые создаются данной фабрикой.
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14 /// </summary>
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15 /// <remarks>
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16 /// Сервисы, которые указаны в регистарциях они должны соответсвовать тому,
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17 /// что фабрика возвращает, но это остается на откуп контейнера
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18 /// </remarks>
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19 [XmlElement("provides")]
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20 public ProvidesElement[] Provides { get; set; }
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21
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22 /// <summary>
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23 /// Переопределяет стандарное поведение регистрации типа в контейнере,
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24 /// дополняя его регистрацией фабричных методов для получения типов.
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25 /// </summary>
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26 /// <param name="builder">Объект для конфигурирования контейнера.</param>
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27 public override void Visit(ContainerBuilder builder) {
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28 var factoryType = GetRegistrationType(builder.ResolveType);
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29
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30 base.Visit(builder);
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31
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32 if (Provides != null && Provides.Length > 0) {
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33 // если регистрации явно заданы, используеися информация из них
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34 foreach(var item in Provides) {
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35 var activator = new FactoryActivator {
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36 Name = item.RegistrationName,
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37 RegistrationType = builder.ResolveType(item.RegistrationType),
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38 FactoryName = Name,
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39 FactoryType = factoryType
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40 };
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41 builder.Visit(activator);
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42 }
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43 } else {
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44 // если регистрация явно не задана, в качестве сервиса для регистрации
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45 // используется тип создаваемый фабрикой, который будет добавлен в контейнер
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46 // с темже именем, что и сама фабрика (разные типы могут иметь одно имя для регистрации)
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47 var providedType = (
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48 factoryType.IsGenericType && factoryType.GetGenericTypeDefinition() == typeof(IFactory<>) ?
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49 factoryType :
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50 factoryType.GetInterface(typeof(IFactory<>).FullName)
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51 )?
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52 .GetGenericArguments()[0];
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53
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54 // не удалось определеить тип
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55 if (providedType == null)
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56 throw new ArgumentException("Failed to determine a type provided by the factory");
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57
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58 if (providedType.IsGenericParameter)
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59 throw new ArgumentException("Can't register a generic type paramter as a service");
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60
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61 var activator = new FactoryActivator {
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62 Name = Name,
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63 RegistrationType = providedType,
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64 FactoryName = Name,
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65 FactoryType = factoryType
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66 };
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67
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68 builder.Visit(activator);
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69 }
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70 }
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71 }
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72 }