Add .NET Core 2.1 versions

worker/dotnet/Worker/Messaging/IMessageQueue.cs

@@ -0,0 +1,12 @@
+using NATS.Client;
+using Worker.Messaging.Messages;
+
+namespace Worker.Messaging
+{
+    public interface IMessageQueue
+    {
+        IConnection CreateConnection();
+
+        void Publish<TMessage>(TMessage message) where TMessage : Message;
+    }
+}

worker/dotnet/Worker/Messaging/MessageHelper.cs

@@ -0,0 +1,23 @@
+using Newtonsoft.Json;
+using Worker.Messaging.Messages;
+using System.Text;
+
+namespace Worker.Messaging
+{
+    public class MessageHelper
+    {
+        public static byte[] ToData<TMessage>(TMessage message)
+            where TMessage : Message
+        {
+            var json = JsonConvert.SerializeObject(message);
+            return Encoding.Unicode.GetBytes(json);
+        }
+
+        public static TMessage FromData<TMessage>(byte[] data)
+            where TMessage : Message
+        {
+            var json = Encoding.Unicode.GetString(data);
+            return (TMessage)JsonConvert.DeserializeObject<TMessage>(json);
+        }
+    }
+}

worker/dotnet/Worker/Messaging/MessageQueue.cs

@@ -0,0 +1,35 @@
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Logging;
+using NATS.Client;
+using Worker.Messaging.Messages;
+
+namespace Worker.Messaging
+{
+    public class MessageQueue : IMessageQueue
+    {
+        protected readonly IConfiguration _configuration;
+        protected readonly ILogger _logger;
+
+        public MessageQueue(IConfiguration configuration, ILogger<MessageQueue> logger)
+        {
+            _configuration = configuration;
+            _logger = logger;
+        }
+
+        public void Publish<TMessage>(TMessage message)
+            where TMessage : Message
+        {
+            using (var connection = CreateConnection())
+            {
+                var data = MessageHelper.ToData(message);
+                connection.Publish(message.Subject, data);
+            }
+        }
+
+        public IConnection CreateConnection()
+        {
+            var url = _configuration.GetValue<string>("MessageQueue:Url");
+            return new ConnectionFactory().CreateConnection(url);
+        }
+    }
+}

worker/dotnet/Worker/Messaging/Messages/Events/VoteCastEvent.cs

@@ -0,0 +1,15 @@
+using System;
+
+namespace Worker.Messaging.Messages
+{
+    public class VoteCastEvent : Message
+    {
+        public override string Subject { get { return MessageSubject; } }
+
+        public string VoterId {get; set;}
+
+        public string Vote {get; set; }
+
+         public static string MessageSubject = "events.vote.votecast";
+    }
+}

worker/dotnet/Worker/Messaging/Messages/Message.cs

@@ -0,0 +1,16 @@
+using System;
+
+namespace Worker.Messaging.Messages
+{
+    public abstract class Message
+    {
+        public string CorrelationId { get; set; }  
+        
+        public abstract string Subject { get; }      
+
+        public Message()
+        {
+            CorrelationId = Guid.NewGuid().ToString();
+        }
+    }
+}