private void RegisterMessageHandler(Type handlerType, string filteredMessageHandlerCategory)
{
if (handlerType.IsInterface || handlerType.IsAbstract || handlerType.IsGenericType)
{
return;
}
var currentHandlerInterfaceTypes = handlerType.GetInterfaces()
.Where(m => m.IsGenericType && !m.IsGenericTypeDefinition && m.GetGenericTypeDefinition() == typeof(IMessageHandler <>))
.ToArray();
var messageHandlerCategory = MessageHandlerTypeAttribute.GetCategory(handlerType);
if (string.IsNullOrEmpty(filteredMessageHandlerCategory) || messageHandlerCategory == filteredMessageHandlerCategory)
{
foreach (var currentHandlerInterfaceType in currentHandlerInterfaceTypes)
{
var messageType = currentHandlerInterfaceType.GenericTypeArguments[0];
var messageTypeName = MessageTypeAttribute.GetTypeName(messageType);
if (!_messageTypes.ContainsKey(messageTypeName))
{
_messageTypes.Add(messageTypeName, messageType);
}
if (!_messageHandlers.ContainsKey(messageTypeName))
{
_messageHandlers.Add(messageTypeName, (IMessageHandler)Activator.CreateInstance(handlerType));
}
else
{
var ex = new MessageHandlerDuplicateRegistrationException(messageTypeName, handlerType, this);
_logger.Error(ex.Message);
throw ex;
}
}
}
}
/// <summary>
/// 处理消息队列的消息
/// </summary>
/// <param name="currentConsumer"></param>
/// <param name="props"></param>
/// <param name="exchangeName"></param>
/// <param name="queueName"></param>
/// <param name="routingKey"></param>
/// <param name="body"></param>
/// <param name="deliveryTag"></param>
/// <param name="redelivered"></param>
/// <param name="dropIfMessageHandlerNotRegistered">消息处理器未注册时直接丢弃</param>
protected void HandleMessage(IBasicConsumer currentConsumer, IBasicProperties props, string exchangeName, string queueName, string routingKey, byte[] body, ulong deliveryTag, bool redelivered, bool dropIfMessageHandlerNotRegistered)
{
var currentChannel = currentConsumer.Model;
var messageTypeName = props.Type;
if (string.IsNullOrEmpty(props.Type))
{
// 如果未传入类型，则以队列名作为类型名
if (queueName.StartsWith("rpc."))
{
messageTypeName = queueName.Substring(4);
}
else
{
messageTypeName = queueName;
}
}
var context = new MessageHandlingTransportationContext(exchangeName, queueName, new Dictionary <string, object> {
{ MessagePropertyConstants.MESSAGE_ID, string.IsNullOrEmpty(props.MessageId) ? Guid.NewGuid().ToString() : props.MessageId },
{ MessagePropertyConstants.MESSAGE_TYPE, messageTypeName },
{ MessagePropertyConstants.TIMESTAMP, props.Timestamp.UnixTime == 0 ? DateTime.Now : DateTime2UnixTime.FromUnixTime(props.Timestamp.UnixTime) },
{ MessagePropertyConstants.CONTENT_TYPE, string.IsNullOrEmpty(props.ContentType) ? Serializer.ContentType : props.ContentType },
{ MessagePropertyConstants.PAYLOAD, Serializer.GetString(body) },
{ MessagePropertyConstants.ROUTING_KEY, routingKey },
{ MessagePropertyConstants.REPLY_TO, props.ReplyTo },
{ MessagePropertyConstants.CORRELATION_ID, props.CorrelationId }
});
var messageHandlerCategory = string.Empty;
try
{
if (_messageTypes.ContainsKey(messageTypeName))
{
object message = null;
try
{
message = Serializer.Deserialize(body, _messageTypes[messageTypeName]);
}
catch
{
// 消费端无法反序列化消息，则直接丢弃
_logger.Error($"Message [\"{context.GetMessageType()}\"] \"{context.GetPayload()}\" deserialized fail in queue \"{queueName}\".");
LockerExecuter.Execute(currentChannel, () =>
{
RetryPolicy.Retry(() => currentChannel.BasicReject(deliveryTag, false),
retryCondition: retryEx => IOHelper.IsIOError(retryEx) || RabbitMQExceptionHelper.IsChannelError(retryEx),
retryTimeInterval: 1000);
});
}
if (message == null)
{
return;
}
var messageHandler = GetMessageHandler(messageTypeName);
if (messageHandler != null)
{
messageHandlerCategory = MessageHandlerTypeAttribute.GetCategory(messageHandler.GetType());
TriggerOnMessageReceived(new MessageReceivedEventArgs(messageHandlerCategory, this.GetReceiverType(), context));
RetryPolicy.Retry(() =>
{
try
{
messageHandler.GetType().InvokeMember("Handle",
BindingFlags.InvokeMethod
| BindingFlags.Public
| BindingFlags.Instance,
null, messageHandler, new object[] { message, context });
}
catch (Exception handleEx)
{
context.LastException = handleEx is TargetInvocationException ? handleEx.InnerException : handleEx;
throw handleEx;
}
}, cancelOnFailed: (retryCount, retryException) =>
{
if (retryCount >= MaxRetryCount)
{
return(true);
}
context.LastException = retryException is TargetInvocationException ? retryException.InnerException : retryException;
context.RetryCount = retryCount + 1;
return(false);
});
TriggerOnMessageHandlingSucceeded(new MessageHandlingSucceededEventArgs(messageHandlerCategory, this.GetReceiverType(), context));
LockerExecuter.Execute(currentChannel, () =>
{
RetryPolicy.Retry(() => currentChannel.BasicAck(deliveryTag, false),
retryCondition: retryEx => IOHelper.IsIOError(retryEx) || RabbitMQExceptionHelper.IsChannelError(retryEx),
retryTimeInterval: 1000);
});
}
else if (dropIfMessageHandlerNotRegistered)
{
// 消费端无对应的消息处理器，则忽略，直接响应成功
LockerExecuter.Execute(currentChannel, () =>
{
RetryPolicy.Retry(() => currentChannel.BasicAck(deliveryTag, false),
retryCondition: retryEx => IOHelper.IsIOError(retryEx) || RabbitMQExceptionHelper.IsChannelError(retryEx),
retryTimeInterval: 1000);
});
}
else
{
context.LastException = new MessageHandlerNotRegisteredException(messageTypeName);
if (TriggerOnMessageHandlingFailed(new MessageHandlingFailedEventArgs(messageHandlerCategory, this.GetReceiverType(), context)))
{
LockerExecuter.Execute(currentChannel, () =>
{
RetryPolicy.Retry(() => currentChannel.BasicAck(deliveryTag, false),
retryCondition: retryEx => IOHelper.IsIOError(retryEx) || RabbitMQExceptionHelper.IsChannelError(retryEx),
retryTimeInterval: 1000);
});
}
else
{
LockerExecuter.Execute(currentChannel, () =>
{
RetryPolicy.Retry(() => currentChannel.BasicReject(deliveryTag, false),
retryCondition: retryEx => IOHelper.IsIOError(retryEx) || RabbitMQExceptionHelper.IsChannelError(retryEx),
retryTimeInterval: 1000);
});
}
}
}
else if (dropIfMessageHandlerNotRegistered)
{
// 消费端无对应的消息处理器，则忽略，直接响应成功
LockerExecuter.Execute(currentChannel, () =>
{
RetryPolicy.Retry(() => currentChannel.BasicAck(deliveryTag, false),
retryCondition: retryEx => IOHelper.IsIOError(retryEx) || RabbitMQExceptionHelper.IsChannelError(retryEx),
retryTimeInterval: 1000);
});
}
else
{
context.LastException = new MessageHandlerNotRegisteredException(messageTypeName);
if (TriggerOnMessageHandlingFailed(new MessageHandlingFailedEventArgs(messageHandlerCategory, this.GetReceiverType(), context)))
{
LockerExecuter.Execute(currentChannel, () =>
{
RetryPolicy.Retry(() => currentChannel.BasicAck(deliveryTag, false),
retryCondition: retryEx => IOHelper.IsIOError(retryEx) || RabbitMQExceptionHelper.IsChannelError(retryEx),
retryTimeInterval: 1000);
});
}
else
{
LockerExecuter.Execute(currentChannel, () =>
{
RetryPolicy.Retry(() => currentChannel.BasicReject(deliveryTag, false),
retryCondition: retryEx => IOHelper.IsIOError(retryEx) || RabbitMQExceptionHelper.IsChannelError(retryEx),
retryTimeInterval: 1000);
});
}
}
}
catch (Exception ex)
{
// 消费端处理其他异常
context.LastException = ex is TargetInvocationException ? ex.InnerException : ex;
if (TriggerOnMessageHandlingFailed(new MessageHandlingFailedEventArgs(messageHandlerCategory, this.GetReceiverType(), context)))
{
LockerExecuter.Execute(currentChannel, () =>
{
RetryPolicy.Retry(() => currentChannel.BasicAck(deliveryTag, false),
retryCondition: retryEx => IOHelper.IsIOError(retryEx) || RabbitMQExceptionHelper.IsChannelError(retryEx),
retryTimeInterval: 1000);
});
}
else
{
LockerExecuter.Execute(currentChannel, () =>
{
RetryPolicy.Retry(() => currentChannel.BasicReject(deliveryTag, false),
retryCondition: retryEx => IOHelper.IsIOError(retryEx) || RabbitMQExceptionHelper.IsChannelError(retryEx),
retryTimeInterval: 1000);
});
}
}
}