mirror of https://github.com/lidarr/Lidarr
74 lines
2.5 KiB
C#
74 lines
2.5 KiB
C#
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using System;
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using System.Threading.Tasks;
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using NLog;
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using NzbDrone.Common;
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using NzbDrone.Common.EnsureThat;
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using NzbDrone.Common.Messaging;
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using NzbDrone.Common.TPL;
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namespace NzbDrone.Core.Messaging.Events
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{
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public class EventAggregator : IEventAggregator
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{
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private readonly Logger _logger;
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private readonly IServiceFactory _serviceFactory;
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private readonly TaskFactory _taskFactory;
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public EventAggregator(Logger logger, IServiceFactory serviceFactory)
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{
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var scheduler = new LimitedConcurrencyLevelTaskScheduler(3);
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_logger = logger;
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_serviceFactory = serviceFactory;
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_taskFactory = new TaskFactory(scheduler);
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}
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public void PublishEvent<TEvent>(TEvent @event) where TEvent : class ,IEvent
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{
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Ensure.That(() => @event).IsNotNull();
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var eventName = GetEventName(@event.GetType());
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_logger.Trace("Publishing {0}", eventName);
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//call synchronous handlers first.
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foreach (var handler in _serviceFactory.BuildAll<IHandle<TEvent>>())
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{
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try
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{
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_logger.Trace("{0} -> {1}", eventName, handler.GetType().Name);
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handler.Handle(@event);
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_logger.Trace("{0} <- {1}", eventName, handler.GetType().Name);
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}
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catch (Exception e)
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{
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_logger.ErrorException(string.Format("{0} failed while processing [{1}]", handler.GetType().Name, eventName), e);
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}
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}
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foreach (var handler in _serviceFactory.BuildAll<IHandleAsync<TEvent>>())
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{
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var handlerLocal = handler;
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_taskFactory.StartNew(() =>
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{
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_logger.Trace("{0} ~> {1}", eventName, handlerLocal.GetType().Name);
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handlerLocal.HandleAsync(@event);
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_logger.Trace("{0} <~ {1}", eventName, handlerLocal.GetType().Name);
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}, TaskCreationOptions.PreferFairness)
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.LogExceptions();
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}
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}
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private static string GetEventName(Type eventType)
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{
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if (!eventType.IsGenericType)
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{
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return eventType.Name;
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}
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return string.Format("{0}<{1}>", eventType.Name.Remove(eventType.Name.IndexOf('`')), eventType.GetGenericArguments()[0].Name);
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}
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}
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}
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