private IEnumerable <Func <object, Func <Task>, Task> > CreateMiddlewareExecutors(IServiceProvider services, Type messageType)
{
foreach (var middlewareType in _middlewareTypes)
{
var middleware = services.GetService(middlewareType);
var executor = PipelineExpressionFactory.GetMiddlewareExecutor(middleware, messageType);
yield return(async(context, next) => await executor(context, next));
}
}
public async Task Execute(Type messageType, object message, IServiceProvider services, Func <object, Task> last)
{
var ctx = PipelineExpressionFactory.GetMessagecontextConstructor(messageType)(message, services);
Func <object, Task> source = last;
var middlewareExecutors = CreateMiddlewareExecutors(services, messageType);
foreach (var middlewareExecutor in middlewareExecutors)
{
source = CreatePipelineLevelExecutor(source, middlewareExecutor);
}
await source(ctx);
}
