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Lidarr/NzbDrone.Common/Messaging/MessageAggregator.cs

62 lines
2.2 KiB

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using NLog;
namespace NzbDrone.Common.Messaging
{
public class MessageAggregator : IMessageAggregator
{
private readonly Logger _logger;
private readonly Func<IEnumerable<IProcessMessage>> _handlers;
public MessageAggregator(Logger logger, Func<IEnumerable<IProcessMessage>> handlers)
{
_logger = logger;
_handlers = handlers;
}
public void PublishEvent<TEvent>(TEvent @event) where TEvent : IEvent
{
_logger.Trace("Publishing {0}", @event.GetType().Name);
//call synchronous handlers first.
foreach (var handler in _handlers().OfType<IHandle<TEvent>>())
{
try
{
_logger.Debug("{0} -> {1}", @event.GetType().Name, handler.GetType().Name);
handler.Handle(@event);
_logger.Debug("{0} <- {1}", @event.GetType().Name, handler.GetType().Name);
}
catch (Exception e)
{
_logger.ErrorException(string.Format("{0} failed while processing [{1}]", handler.GetType().Name, @event.GetType().Name), e);
}
}
foreach (var handler in _handlers().OfType<IHandleAsync<TEvent>>())
{
var handlerLocal = handler;
Task.Factory.StartNew(() =>
{
_logger.Debug("{0} ~> {1}", @event.GetType().Name, handlerLocal.GetType().Name);
handlerLocal.HandleAsync(@event);
_logger.Debug("{0} <~ {1}", @event.GetType().Name, handlerLocal.GetType().Name);
});
}
}
public void PublishCommand<TCommand>(TCommand command) where TCommand : ICommand
{
_logger.Trace("Publishing {0}", command.GetType().Name);
var handler = _handlers().OfType<IExecute<TCommand>>().Single();
_logger.Debug("{0} -> {1}", command.GetType().Name, handler.GetType().Name);
handler.Execute(command);
_logger.Debug("{0} <- {1}", command.GetType().Name, handler.GetType().Name);
}
}
}