src/MassTransit/Configuration/ObserverExtensions.cs - develop - vshmidt/masstransit

src/MassTransit/Configuration/ObserverExtensions.cs

59 строк2 KB

Chris Patterson

Integration of all external packages into MassTransit, split out into Abstractions, Middleware, and the core MassTransit assembly.

22 янв 2022, 18:24

22 янв 2022, 18:24b5b4f50

namespace MassTransit
{
    using System;
    using Configuration;


    public static class ObserverExtensions
    {
        /// <summary>
        /// Subscribes an observer instance to the bus
        /// </summary>
        /// <param name="configurator">
        /// Service Bus Service Configurator
        /// - the item that is passed as a parameter to
        /// the action that is calling the configurator.
        /// </param>
        /// <param name="observer">The observer to connect to the endpoint</param>
        /// <param name="configureCallback"></param>
        /// <returns>An instance subscription configurator.</returns>
        public static void Observer<T>(this IReceiveEndpointConfigurator configurator, IObserver<ConsumeContext<T>> observer,
            Action<IObserverConfigurator<T>> configureCallback = null)
            where T : class
        {
            var observerConfigurator = new ObserverConfigurator<T>(observer);

            configureCallback?.Invoke(observerConfigurator);

            configurator.AddEndpointSpecification(observerConfigurator);
        }

        /// <summary>
        /// Adds a message observer to the service bus for handling a specific type of message
        /// </summary>
        /// <typeparam name="T">The message type to handle, often inferred from the callback specified</typeparam>
        /// <param name="bus"></param>
        /// <param name="observer">
        /// The callback to invoke when messages of the specified type arrive on the service bus
        /// </param>
        public static ConnectHandle ConnectObserver<T>(this IBus bus, IObserver<ConsumeContext<T>> observer)
            where T : class
        {
            return ObserverConnectorCache<T>.Connector.ConnectObserver(bus, observer);
        }

        /// <summary>
        /// Subscribe a request observer to the bus's endpoint
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="bus"></param>
        /// <param name="requestId"></param>
        /// <param name="observer"></param>
        /// <returns></returns>
        public static ConnectHandle ConnectRequestObserver<T>(this IBus bus, Guid requestId, IObserver<ConsumeContext<T>> observer)
            where T : class
        {
            return ObserverConnectorCache<T>.Connector.ConnectRequestObserver(bus, requestId, observer);
        }
    }
}