/// <summary>
/// Runs the middleware described by <see cref="TaskMiddlewareDescriptor"/>.
/// </summary>
/// <param name="descriptor">The task middleware to find and run.</param>
/// <param name="context">The dispatch middleware context.</param>
/// <param name="next">The next middleware callback.</param>
/// <returns>A task that completes when the middleware has finished executing.</returns>
public static Task RunAsync(
TaskMiddlewareDescriptor descriptor, DispatchMiddlewareContext context, Func <Task> next)
{
Check.NotNull(descriptor, nameof(descriptor));
Check.NotNull(context, nameof(context));
Check.NotNull(next, nameof(next));
IServiceProvider serviceProvider = context.GetProperty <IServiceProvider>();
ITaskMiddleware middleware = GetMiddleware(descriptor, serviceProvider);
if (middleware is null)
{
// This _should not_ be possible, as TaskMiddlewareDescriptor is designed to only be constructable with
// valid values. But a good sanity check here.
ILogger logger = serviceProvider.CreateLogger(typeof(TaskMiddlewareRunner));
string message = Strings.MiddlewareCreationFailed(descriptor);
logger.LogError(message);
throw new InvalidOperationException(message); // TODO: maybe a better exception type.
}
return(middleware.InvokeAsync(context, next));
}
/// <summary>
/// Add the middleware to the processing pipeline
/// </summary>
/// <param name="session">The current session</param>
/// <param name="middleware">The middleware to add</param>
/// <returns></returns>
public static ProfilerSession AddMiddleware(this ProfilerSession session, ITaskMiddleware middleware)
{
session.ProcessingPipeline.SetNext(middleware);
return(session);
}
