public MessageDistributor(
NsqBus bus,
IObjectBuilder objectBuilder,
ILogger logger,
MessageHandlerMetadata messageHandlerMetadata
)
{
if (bus == null)
throw new ArgumentNullException("bus");
if (objectBuilder == null)
throw new ArgumentNullException("objectBuilder");
if (logger == null)
throw new ArgumentNullException("logger");
if (messageHandlerMetadata == null)
throw new ArgumentNullException("messageHandlerMetadata");
_bus = bus;
_objectBuilder = objectBuilder;
_logger = logger;
_serializer = messageHandlerMetadata.Serializer;
_handlerType = messageHandlerMetadata.HandlerType;
_messageType = messageHandlerMetadata.MessageType;
_messageAuditor = messageHandlerMetadata.MessageAuditor;
_topic = messageHandlerMetadata.Topic;
_channel = messageHandlerMetadata.Channel;
var possibleMethods = _handlerType.GetMethods().Where(p => p.Name == "Handle" && !p.IsGenericMethod);
foreach (var possibleMethod in possibleMethods)
{
var parameters = possibleMethod.GetParameters();
if (parameters.Length == 1 && parameters[0].ParameterType == _messageType)
{
_handleMethod = possibleMethod;
break;
}
}
if (_handleMethod == null)
throw new Exception(string.Format("Handle({0}) not found on {1}", _messageType, _handlerType));
if (!_messageType.IsInterface)
{
_concreteMessageType = _messageType;
}
else
{
_concreteMessageType = InterfaceBuilder.CreateType(_messageType);
}
}
public void StartBus()
{
// TODO: Needs to move to NsqBus. See below comment about async bus start.
// TODO: This also makes an assumption nsqd is running locally on port 4151. Convenient for testing and sample
// TODO: apps, probably shouldn't be used in PROD. This needs to be thought through.
if (_preCreateTopicsAndChannels)
{
const string nsqdHttpAddress = "127.0.0.1:4151";
var nsqdHttpClient = new NsqdHttpClient(nsqdHttpAddress, TimeSpan.FromSeconds(5));
var wg = new WaitGroup();
foreach (var tch in GetHandledTopics())
{
foreach (var channel in tch.Channels)
{
string localTopic = tch.Topic;
string localChannel = channel;
wg.Add(1);
GoFunc.Run(() =>
{
try
{
nsqdHttpClient.CreateTopic(localTopic);
nsqdHttpClient.CreateChannel(localTopic, localChannel);
}
catch (Exception ex)
{
_nsqLogger.Output(LogLevel.Error,
string.Format("error creating topic/channel on {0} - {1}", nsqdHttpAddress, ex));
}
wg.Done();
}, "BusConfiguration pre-create topics/channels");
}
}
wg.Wait();
}
if (_busStateChangedHandler != null)
{
_busStateChangedHandler.OnBusStarting(this);
}
_bus = new NsqBus(
_topicChannelHandlers,
_dependencyInjectionContainer,
_messageTypeToTopicProvider,
_defaultMessageSerializer,
_nsqLogger,
_messageMutator,
_messageTopicRouter,
_nsqdPublisher
);
_bus.Start();
// TODO: BusConfiguration should not be responsible for these callbacks. With an async _bus.Start
// TODO: this will need to be moved to NsqBus.
if (_busStateChangedHandler != null)
{
_busStateChangedHandler.OnBusStarted(this, _bus);
}
}