private static void AddRequiredServices(IServiceCollection services, MediatRServiceConfiguration serviceConfiguration)
{
services.AddScoped <ServiceFactory>(p => p.GetService);
services.AddScoped(typeof(IPipelineBehavior <,>), typeof(RequestPreProcessorBehavior <,>));
services.AddScoped(typeof(IPipelineBehavior <,>), typeof(RequestPostProcessorBehavior <,>));
services.Add(new ServiceDescriptor(typeof(IMediator), serviceConfiguration.MediatorImplementationType, serviceConfiguration.Lifetime));
}
/// <summary>
/// Registers handlers and mediator types from the assemblies that contain the specified types
/// </summary>
/// <param name="services"></param>
/// <param name="handlerAssemblyMarkerTypes"></param>
/// <param name="configuration">The action used to configure the options</param>
/// <returns>Service collection</returns>
public static IServiceCollection AddMediatR(this IServiceCollection services, IEnumerable <Type> handlerAssemblyMarkerTypes, Action <MediatRServiceConfiguration> configuration)
{
var serviceConfig = new MediatRServiceConfiguration();
configuration?.Invoke(serviceConfig);
AddRequiredServices(services, serviceConfig);
AddMediatRClasses(services, handlerAssemblyMarkerTypes.Select(t => t.GetTypeInfo().Assembly));
return(services);
}
public static IServiceCollection AddMediatRCore(this IServiceCollection services, Action <MediatRServiceConfiguration> configuration = null)
{
var serviceConfig = new MediatRServiceConfiguration();
configuration?.Invoke(serviceConfig);
ServiceRegistrar.AddRequiredServices(services, serviceConfig);
return(services);
}
/// <summary>
/// Registers handlers and mediator types from the specified assemblies
/// </summary>
/// <param name="services">Service collection</param>
/// <param name="assemblies">Assemblies to scan</param>
/// <param name="configuration">The action used to configure the options</param>
/// <returns>Service collection</returns>
public static IServiceCollection AddMediatR(this IServiceCollection services, IEnumerable <Assembly> assemblies, Action <MediatRServiceConfiguration> configuration)
{
var serviceConfig = new MediatRServiceConfiguration();
configuration?.Invoke(serviceConfig);
AddRequiredServices(services, serviceConfig);
AddMediatRClasses(services, assemblies);
return(services);
}
/// <summary>
/// Registers handlers and mediator types from the specified assemblies
/// </summary>
/// <param name="services">Service collection</param>
/// <param name="assemblies">Assemblies to scan</param>
/// <param name="configuration">The action used to configure the options</param>
/// <returns>Service collection</returns>
public static IServiceCollection AddMediatR(this IServiceCollection services, IEnumerable <Assembly> assemblies, Action <MediatRServiceConfiguration> configuration)
{
if (!assemblies.Any())
{
throw new ArgumentException("No assemblies found to scan. Supply at least one assembly to scan for handlers.");
}
var serviceConfig = new MediatRServiceConfiguration();
configuration?.Invoke(serviceConfig);
ServiceRegistrar.AddRequiredServices(services, serviceConfig);
ServiceRegistrar.AddMediatRClasses(services, assemblies);
return(services);
}
private static void AddRequiredServices(IServiceCollection services, MediatRServiceConfiguration serviceConfiguration)
{
services.AddScoped <ServiceFactory>(p => type =>
{
try
{
return(p.GetService(type));
}
catch (ArgumentException)
{
// Let's assume it's a constrained generic type
if (type.IsConstructedGenericType &&
type.GetGenericTypeDefinition() == typeof(IEnumerable <>))
{
var serviceType = type.GenericTypeArguments.Single();
var serviceTypes = new List <Type>();
foreach (var service in services.ToList())
{
if (serviceType.IsConstructedGenericType &&
serviceType.GetGenericTypeDefinition() == service.ServiceType)
{
try
{
var closedImplType = service.ImplementationType.MakeGenericType(serviceType.GenericTypeArguments);
serviceTypes.Add(closedImplType);
} catch (ArgumentException) { }
}
}
services.Replace(new ServiceDescriptor(type, sp =>
{
return(serviceTypes.Select(sp.GetService).ToArray());
}, ServiceLifetime.Transient));
var resolved = Array.CreateInstance(serviceType, serviceTypes.Count);
Array.Copy(serviceTypes.Select(p.GetService).ToArray(), resolved, serviceTypes.Count);
return(resolved);
}
throw;
}
});
services.Add(new ServiceDescriptor(typeof(IMediator), serviceConfiguration.MediatorImplementationType, serviceConfiguration.Lifetime));
}