public static IServiceCollection AddMessageHandlers(this IServiceCollection services)
{
void RegisterHandler <TMessageType, THandler>()
where TMessageType : class
where THandler : IMessageHandler <TMessageType>
{
services.AddSingleton <TMessageType>();
services.AddSingleton(
serviceProvider => new MessageHandlerWrapper <TMessageType>(serviceProvider.GetService <THandler>())
);
}
// MessageTypeOneHandler is the implementation of IMessageHandler<MessageTypeOne>
RegisterHandler <MessageTypeOne, MessageTypeOneHandler>();
RegisterHandler <MessageTypeTwo, MessageTypeTwoHandler>();
// some string constants for message types would be better.
services.AddSingleton <IMessageHandlerFactory>(serviceProvider =>
{
var factory = new MessageHandlerFactory();
factory.RegisterHandler("messagetypeone",
serviceProvider.GetService <MessageHandlerWrapper <MessageTypeOne> >);
factory.RegisterHandler("messagetypetwo",
serviceProvider.GetService <MessageHandlerWrapper <MessageTypeTwo> >);
return(factory);
});
services.AddSingleton <IMessageHandler, MessageRouter>();
return(services);
}
public static IServiceCollection AddMessageHandlers(this IServiceCollection services)
{
services.RegisterHandler <MessageOne, MessageOneHandler>();
services.RegisterHandler <MessageTwo, MessageTwoHandler>();
// some string constants for message types would be better.
services.AddSingleton <IMessageHandlerFactory>(serviceProvider =>
{
var factory = new MessageHandlerFactory();
factory.RegisterHandler("MessageOne",
serviceProvider.GetService <MessageHandlerWrapper <MessageOne> >);
factory.RegisterHandler("MessageTwo",
serviceProvider.GetService <MessageHandlerWrapper <MessageTwo> >);
return(factory);
});
services.AddSingleton <IMessageHandler, MessageRouter>();
return(services);
}