public static MicroserviceFrameworkBuilder RegisterEventHandlers(this MicroserviceFrameworkBuilder builder)
{
MicroserviceFrameworkLoaderContext.Get(builder.Services).ResolveType += type =>
{
var interfaces = type.GetInterfaces();
var handlerInterfaceTypes = interfaces
.Where(@interface => @interface.IsGenericType &&
EventHandlerBaseType == @interface.GetGenericTypeDefinition())
.ToList();
if (handlerInterfaceTypes.Count == 0)
{
return;
}
foreach (var handlerInterfaceType in handlerInterfaceTypes)
{
var eventType = handlerInterfaceType.GenericTypeArguments[0];
if (!eventType.IsEvent())
{
throw new MicroserviceFrameworkException($"{eventType} 不是合法的事件类型");
}
// 消息队列，得知道系统实现了哪些 EventHandler 才去监听对应的 Topic，所以必须先注册监听。
EventSubscriptionManager.Register(eventType, handlerInterfaceType);
// 每次收到的消息都是独立的 Scope
ServiceCollectionUtilities.TryAdd(builder.Services,
new ServiceDescriptor(handlerInterfaceType, type, ServiceLifetime.Scoped));
}
};
return(builder);
}
/// <summary>
/// 以类型实现的接口进行服务添加，需排除
/// <see cref="IDisposable"/>等非业务接口，如无接口则注册自身
/// </summary>
/// <param name="services">服务映射信息集合</param>
/// <param name="implementationType">要注册的实现类型集合</param>
/// <param name="lifetime">注册的生命周期类型</param>
private static void RegisterDependencyInjection(this IServiceCollection services,
Type implementationType, ServiceLifetime lifetime)
{
if (implementationType.IsAbstract || implementationType.IsInterface)
{
return;
}
// 1. 注册类型本身
ServiceCollectionUtilities.TryAdd(services,
new ServiceDescriptor(implementationType, implementationType, lifetime));
var interfaceTypes = implementationType.GetInterfaces(
typeof(ITransientDependency),
typeof(ISingletonDependency),
typeof(IScopeDependency),
typeof(IDomainService),
typeof(ISession),
typeof(IRequest),
typeof(IRequest <>)).ToArray();
if (interfaceTypes.Length == 0)
{
return;
}
for (var i = 0; i < interfaceTypes.Length; i++)
{
var interfaceType = interfaceTypes[i];
// 瞬时生命周期每次获取对象都是新的，因此实现的接口每个注册一次即可
if (lifetime == ServiceLifetime.Transient)
{
ServiceCollectionUtilities.TryAdd(services,
new ServiceDescriptor(interfaceType, implementationType, ServiceLifetime.Transient));
}
else
{
if (i == 0)
{
ServiceCollectionUtilities.TryAdd(services,
new ServiceDescriptor(interfaceType, implementationType, lifetime));
}
else
{
//有多个接口时，后边的接口注册使用第一个接口的实例，保证同个实现类的多个接口获得同一个实例
var firstInterfaceType = interfaceTypes[0];
ServiceCollectionUtilities.TryAdd(services, new ServiceDescriptor(interfaceType,
provider => provider.GetService(firstInterfaceType), lifetime));
}
}
}
}
