refactor log messages.

src/DotNetCore.CAP.Kafka/KafkaConsumerClient.cs

@@ -24,7 +24,7 @@ namespace DotNetCore.CAP.Kafka
 
         public event EventHandler<MessageContext> OnMessageReceived;
 
-        public event EventHandler<string> OnError;
+        public event EventHandler<LogMessageEventArgs> OnLog;
 
         public void Subscribe(IEnumerable<string> topics)
         {
@@ -34,7 +34,6 @@ namespace DotNetCore.CAP.Kafka
             if (_consumerClient == null)
                 InitKafkaClient();
 
-            //_consumerClient.Assign(topics.Select(x=> new TopicPartition(x, 0)));
             _consumerClient.Subscribe(topics);
         }
 
@@ -76,12 +75,17 @@ namespace DotNetCore.CAP.Kafka
             _consumerClient.OnError += ConsumerClient_OnError;
         }
 
+
         private void ConsumerClient_OnConsumeError(object sender, Message e)
         {
             var message = e.Deserialize<Null, string>(null, StringDeserializer);
-
-            OnError?.Invoke(sender, $"An error occurred during consume the message; Topic:'{e.Topic}'," +
-                $"Message:'{message.Value}', Reason:'{e.Error}'.");
+            var logArgs = new LogMessageEventArgs
+            {
+                LogType = MqLogType.ConsumeError,
+                Reason = $"An error occurred during consume the message; Topic:'{e.Topic}'," +
+                         $"Message:'{message.Value}', Reason:'{e.Error}'."
+            };
+            OnLog?.Invoke(sender, logArgs);
         }
 
         private void ConsumerClient_OnMessage(object sender, Message<Null, string> e)
@@ -98,7 +102,12 @@ namespace DotNetCore.CAP.Kafka
 
         private void ConsumerClient_OnError(object sender, Error e)
         {
-            OnError?.Invoke(sender, e.ToString());
+            var logArgs = new LogMessageEventArgs
+            {
+                LogType = MqLogType.ServerConnError,
+                Reason = e.ToString()
+            };
+            OnLog?.Invoke(sender, logArgs);
         }
 
         #endregion private methods

src/DotNetCore.CAP/MqLogType.cs

@@ -0,0 +1,24 @@
+using System;
+
+namespace DotNetCore.CAP
+{
+    public enum MqLogType
+    {
+        //RabbitMQ
+        ConsumerCancelled,
+        ConsumerRegistered,
+        ConsumerUnregistered,
+        ConsumerShutdown,
+
+        //Kafka
+        ConsumeError,
+        ServerConnError
+    }
+
+    public class LogMessageEventArgs : EventArgs
+    {
+        public string Reason { get; set; }
+
+        public MqLogType LogType { get; set; }
+    }
+}