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);
}
public static void AddMicroserviceFramework(this IServiceCollection services,
Action <MicroserviceFrameworkBuilder> builderAction = null)
{
var builder = new MicroserviceFrameworkBuilder(services);
builder.Services.TryAddSingleton <ApplicationInfo>();
builder.UseDefaultJsonHelper();
// 放到后面，加载优先级更高
builderAction?.Invoke(builder);
// 请保证这在最后，不然类型扫描事件的注册会晚于扫描
MicroserviceFrameworkLoaderContext.Get(services).LoadTypes();
}
public static MicroserviceFrameworkBuilder UseDependencyInjectionLoader(
this MicroserviceFrameworkBuilder builder)
{
MicroserviceFrameworkLoaderContext.Get(builder.Services).ResolveType += type =>
{
var lifetime = LifetimeUtilities.GetLifetime(type);
if (lifetime.HasValue)
{
builder.Services.RegisterDependencyInjection(type, lifetime.Value);
}
};
return(builder);
}
public static IServiceCollection AddOptions(this IServiceCollection services, IConfiguration configuration)
{
services.AddOptions();
MicroserviceFrameworkLoaderContext.Get(services).ResolveType += type =>
{
if (type.IsAbstract || type.IsInterface)
{
return;
}
var attribute = type.GetCustomAttribute <OptionsTypeAttribute>();
if (attribute != null)
{
var section = string.IsNullOrWhiteSpace(attribute.Section)
? configuration
: configuration.GetSection(attribute.Section);
services.AddOptions(type, section, _ => { });
}
};
return(services);
}
