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Lidarr/NzbDrone.Common/Messaging/MessageAggregator.cs

117 lines
3.9 KiB

using System;
using System.Linq;
using System.Reflection;
using System.Threading.Tasks;
using NLog;
using NzbDrone.Common.Composition;
using NzbDrone.Common.EnsureThat;
using NzbDrone.Common.Serializer;
namespace NzbDrone.Common.Messaging
{
[Singleton]
public class MessageAggregator : IMessageAggregator
{
private readonly Logger _logger;
private readonly IServiceFactory _serviceFactory;
public MessageAggregator(Logger logger, IServiceFactory serviceFactory)
{
_logger = logger;
_serviceFactory = serviceFactory;
}
public void PublishEvent<TEvent>(TEvent @event) where TEvent : class ,IEvent
{
Ensure.That(() => @event).IsNotNull();
var eventName = GetEventName(@event.GetType());
_logger.Trace("Publishing {0}", eventName);
//call synchronous handlers first.
foreach (var handler in _serviceFactory.BuildAll<IHandle<TEvent>>())
{
try
{
_logger.Debug("{0} -> {1}", eventName, handler.GetType().Name);
handler.Handle(@event);
_logger.Debug("{0} <- {1}", eventName, handler.GetType().Name);
}
catch (Exception e)
{
_logger.ErrorException(string.Format("{0} failed while processing [{1}]", handler.GetType().Name, eventName), e);
}
}
foreach (var handler in _serviceFactory.BuildAll<IHandleAsync<TEvent>>())
{
var handlerLocal = handler;
Task.Factory.StartNew(() =>
{
_logger.Debug("{0} ~> {1}", eventName, handlerLocal.GetType().Name);
handlerLocal.HandleAsync(@event);
_logger.Debug("{0} <~ {1}", eventName, handlerLocal.GetType().Name);
});
}
}
private static string GetEventName(Type eventType)
{
if (!eventType.IsGenericType)
{
return eventType.Name;
}
return string.Format("{0}<{1}>", eventType.Name.Remove(eventType.Name.IndexOf('`')), eventType.GetGenericArguments()[0].Name);
}
public void PublishCommand<TCommand>(TCommand command) where TCommand : class, ICommand
{
Ensure.That(() => command).IsNotNull();
var handlerContract = typeof(IExecute<>).MakeGenericType(command.GetType());
_logger.Trace("Publishing {0}", command.GetType().Name);
var handler = _serviceFactory.Build(handlerContract);
_logger.Debug("{0} -> {1}", command.GetType().Name, handler.GetType().Name);
try
{
handlerContract.GetMethod("Execute").Invoke(handler, new object[] { command });
PublishEvent(new CommandCompletedEvent(command));
}
catch (TargetInvocationException e)
{
PublishEvent(new CommandFailedEvent(command, e));
if (e.InnerException != null)
{
throw e.InnerException;
}
throw;
}
finally
{
PublishEvent(new CommandExecutedEvent(command));
}
_logger.Debug("{0} <- {1}", command.GetType().Name, handler.GetType().Name);
}
public void PublishCommand(string commandTypeName)
{
var commandType = _serviceFactory.GetImplementations(typeof(ICommand))
.Single(c => c.FullName.Equals(commandTypeName, StringComparison.InvariantCultureIgnoreCase));
//json.net is better at creating objects
var command = Json.Deserialize("{}", commandType);
PublishCommand((ICommand)command);
}
}
}