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);
}
}
private void AddMessageHandler(Type handlerType, Type messageType, string topic, string channel,
IMessageSerializer messageSerializer = null,
Config config = null,
int?threadsPerHandler = null,
params string[] nsqLookupdHttpAddresses
)
{
if (_bus != null)
{
throw new Exception("Handlers can only be added before the bus is started");
}
if (!Protocol.IsValidTopicName(topic))
{
throw new ArgumentException(string.Format("'{0}' is not a valid topic name", topic), "topic");
}
if (!Protocol.IsValidChannelName(channel))
{
throw new ArgumentException(string.Format("'{0}' is not a valid channel name", topic), "channel");
}
if (handlerType.IsAbstract && !handlerType.IsInterface)
{
throw new ArgumentException("handlerType must be instantiable; cannot be an abstract class", "handlerType");
}
if (nsqLookupdHttpAddresses == null || nsqLookupdHttpAddresses.Length == 0)
{
nsqLookupdHttpAddresses = _defaultNsqlookupdHttpEndpoints;
}
string key = string.Format("{0}/{1}", topic, channel);
List <MessageHandlerMetadata> list;
if (!_topicChannelHandlers.TryGetValue(key, out list))
{
list = new List <MessageHandlerMetadata>();
_topicChannelHandlers.Add(key, list);
}
// remove duplicates based on topic/channel/handlerType; replace with new values
foreach (var item in new List <MessageHandlerMetadata>(list))
{
if (item.HandlerType == handlerType)
{
list.Remove(item);
}
}
// add topic/channel handler
var messageHandlerMetadata = new MessageHandlerMetadata
{
Topic = topic,
Channel = channel,
HandlerType = handlerType,
MessageType = messageType,
NsqLookupdHttpAddresses = nsqLookupdHttpAddresses,
Serializer = messageSerializer ?? _defaultMessageSerializer,
MessageAuditor = _messageAuditor,
Config = config ?? _nsqConfig,
InstanceCount = threadsPerHandler ?? _defaultThreadsPerHandler
};
list.Add(messageHandlerMetadata);
}