Lidarr/NzbDrone.Common/Messaging/MessageAggregator.cs

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C#
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using System;
using System.Diagnostics;
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using System.Linq;
using System.Threading.Tasks;
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using NLog;
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using NzbDrone.Common.EnsureThat;
using NzbDrone.Common.Messaging.Events;
using NzbDrone.Common.Messaging.Tracking;
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using NzbDrone.Common.Serializer;
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using NzbDrone.Common.TPL;
namespace NzbDrone.Common.Messaging
{
public class MessageAggregator : IMessageAggregator
{
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private readonly Logger _logger;
private readonly IServiceFactory _serviceFactory;
private readonly ITrackCommands _trackCommands;
private readonly TaskFactory _taskFactory;
public MessageAggregator(Logger logger, IServiceFactory serviceFactory, ITrackCommands trackCommands)
{
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_logger = logger;
_serviceFactory = serviceFactory;
_trackCommands = trackCommands;
var scheduler = new LimitedConcurrencyLevelTaskScheduler(2);
_taskFactory = new TaskFactory(scheduler);
}
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public void PublishEvent<TEvent>(TEvent @event) where TEvent : class ,IEvent
{
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Ensure.That(() => @event).IsNotNull();
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var eventName = GetEventName(@event.GetType());
_logger.Trace("Publishing {0}", eventName);
//call synchronous handlers first.
foreach (var handler in _serviceFactory.BuildAll<IHandle<TEvent>>())
{
try
{
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_logger.Debug("{0} -> {1}", eventName, handler.GetType().Name);
handler.Handle(@event);
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_logger.Debug("{0} <- {1}", eventName, handler.GetType().Name);
}
catch (Exception e)
{
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_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;
_taskFactory.StartNew(() =>
{
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_logger.Debug("{0} ~> {1}", eventName, handlerLocal.GetType().Name);
handlerLocal.HandleAsync(@event);
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_logger.Debug("{0} <~ {1}", eventName, handlerLocal.GetType().Name);
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}, TaskCreationOptions.PreferFairness)
.LogExceptions();
}
}
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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);
}
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public void PublishCommand<TCommand>(TCommand command) where TCommand : class, ICommand
{
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Ensure.That(() => command).IsNotNull();
_logger.Trace("Publishing {0}", command.GetType().Name);
var trackedCommand = _trackCommands.TrackIfNew(command);
if (trackedCommand == null)
{
_logger.Info("Command is already in progress: {0}", command.GetType().Name);
return;
}
ExecuteCommand<TCommand>(trackedCommand);
}
public void PublishCommand(string commandTypeName)
{
dynamic command = GetCommand(commandTypeName);
PublishCommand(command);
}
public TrackedCommand PublishCommandAsync<TCommand>(TCommand command) where TCommand : class, ICommand
{
Ensure.That(() => command).IsNotNull();
_logger.Trace("Publishing {0}", command.GetType().Name);
var existingCommand = _trackCommands.TrackNewOrGet(command);
if (existingCommand.Existing)
{
_logger.Info("Command is already in progress: {0}", command.GetType().Name);
return existingCommand.TrackedCommand;
}
_taskFactory.StartNew(() => ExecuteCommand<TCommand>(existingCommand.TrackedCommand)
, TaskCreationOptions.PreferFairness)
.LogExceptions();
return existingCommand.TrackedCommand;
}
public TrackedCommand PublishCommandAsync(string commandTypeName)
{
dynamic command = GetCommand(commandTypeName);
return PublishCommandAsync(command);
}
private dynamic GetCommand(string commandTypeName)
{
var commandType = _serviceFactory.GetImplementations(typeof(ICommand))
.Single(c => c.FullName.Equals(commandTypeName, StringComparison.InvariantCultureIgnoreCase));
return Json.Deserialize("{}", commandType);
}
private void ExecuteCommand<TCommand>(TrackedCommand trackedCommand) where TCommand : class, ICommand
{
var command = (TCommand)trackedCommand.Command;
var handlerContract = typeof(IExecute<>).MakeGenericType(command.GetType());
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var handler = (IExecute<TCommand>)_serviceFactory.Build(handlerContract);
_logger.Debug("{0} -> {1}", command.GetType().Name, handler.GetType().Name);
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var sw = Stopwatch.StartNew();
try
{
if (!MappedDiagnosticsContext.Contains("CommandId"))
{
MappedDiagnosticsContext.Set("CommandId", trackedCommand.Command.CommandId);
}
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PublishEvent(new CommandStartedEvent(trackedCommand));
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handler.Execute(command);
sw.Stop();
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_trackCommands.Completed(trackedCommand, sw.Elapsed);
PublishEvent(new CommandCompletedEvent(trackedCommand));
}
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catch (Exception e)
{
_trackCommands.Failed(trackedCommand, e);
PublishEvent(new CommandFailedEvent(trackedCommand, e));
throw;
}
finally
{
PublishEvent(new CommandExecutedEvent(trackedCommand));
}
_logger.Debug("{0} <- {1} [{2}]", command.GetType().Name, handler.GetType().Name, sw.Elapsed.ToString(""));
}
}
}