111 lines
3.6 KiB
C#
111 lines
3.6 KiB
C#
using System;
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using System.Linq;
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using System.Reflection;
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using System.Threading.Tasks;
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using NLog;
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using NzbDrone.Common.Composition;
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using NzbDrone.Common.EnsureThat;
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using NzbDrone.Common.Serializer;
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namespace NzbDrone.Common.Messaging
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{
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[Singleton]
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public class MessageAggregator : IMessageAggregator
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{
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private readonly Logger _logger;
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private readonly IServiceFactory _serviceFactory;
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public MessageAggregator(Logger logger, IServiceFactory serviceFactory)
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{
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_logger = logger;
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_serviceFactory = serviceFactory;
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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.Debug("{0} -> {1}", eventName, handler.GetType().Name);
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handler.Handle(@event);
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_logger.Debug("{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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Task.Factory.StartNew(() =>
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{
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_logger.Debug("{0} ~> {1}", eventName, handlerLocal.GetType().Name);
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handlerLocal.HandleAsync(@event);
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_logger.Debug("{0} <~ {1}", eventName, handlerLocal.GetType().Name);
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});
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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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public void PublishCommand<TCommand>(TCommand command) where TCommand : class, ICommand
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{
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Ensure.That(() => command).IsNotNull();
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var handlerContract = typeof(IExecute<>).MakeGenericType(command.GetType());
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_logger.Trace("Publishing {0}", command.GetType().Name);
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var handler = (IExecute<TCommand>)_serviceFactory.Build(handlerContract);
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_logger.Debug("{0} -> {1}", command.GetType().Name, handler.GetType().Name);
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try
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{
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handler.Execute(command);
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PublishEvent(new CommandCompletedEvent(command));
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}
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catch (Exception e)
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{
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PublishEvent(new CommandFailedEvent(command, e));
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throw;
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}
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finally
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{
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PublishEvent(new CommandExecutedEvent(command));
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}
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_logger.Debug("{0} <- {1}", command.GetType().Name, handler.GetType().Name);
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}
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public void PublishCommand(string commandTypeName)
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{
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var commandType = _serviceFactory.GetImplementations(typeof(ICommand))
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.Single(c => c.FullName.Equals(commandTypeName, StringComparison.InvariantCultureIgnoreCase));
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dynamic command = Json.Deserialize("{}", commandType);
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PublishCommand(command);
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}
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}
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}
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