Started refactoring, not in any usable state yet

Annotations/DynamicQueueAttribute.cs

@@ -0,0 +1,13 @@
+using System;
+
+namespace Tapeti.Annotations
+{
+    /// <summary>
+    /// Creates a non-durable auto-delete queue to receive messages. Can be used
+    /// on an entire MessageController class or on individual methods.
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
+    public class DynamicQueueAttribute : Attribute
+    {
+    }
+}

Annotations/MessageControllerAttribute.cs

@@ -0,0 +1,9 @@
+using System;
+
+namespace Tapeti.Annotations
+{
+    [AttributeUsage(AttributeTargets.Class)]
+    public class MessageControllerAttribute : Attribute
+    {
+    }
+}

Annotations/QueueAttribute.cs

@@ -1,18 +0,0 @@
-using System;
-
-namespace Tapeti.Annotations
-{
-    [AttributeUsage(AttributeTargets.Class)]
-    public class QueueAttribute : Attribute
-    {
-        public string Name { get; set; }
-        public bool Dynamic { get; set; }
-
-
-        public QueueAttribute(string name = null)
-        {
-            Name = name;
-            Dynamic = (name == null);
-        }
-    }
-}

Annotations/StaticQueueAttribute.cs

@@ -0,0 +1,25 @@
+using System;
+
+namespace Tapeti.Annotations
+{
+    /// <summary>
+    /// Binds to an existing durable queue to receive messages. Can be used
+    /// on an entire MessageController class or on individual methods.
+    /// </summary>
+    /// <remarks>
+    /// At the moment there is no support for creating a durable queue and managing the
+    /// bindings. The author recommends https://git.x2software.net/pub/RabbitMetaQueue
+    /// for deploy-time management of durable queues (shameless plug intended).
+    /// </remarks>
+    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
+    public class StaticQueueAttribute : Attribute
+    {
+        public string Name { get; set; }
+
+
+        public StaticQueueAttribute(string name)
+        {
+            Name = name;
+        }
+    }
+}

Connection/TapetiPublisher.cs

@@ -1,21 +1,22 @@
-using System.Threading.Tasks;
+using System;
+using System.Threading.Tasks;
 
 namespace Tapeti.Connection
 {
     public class TapetiPublisher : IPublisher
     {
-        private readonly TapetiWorker worker;
+        private readonly Func<TapetiWorker> workerFactory;
 
 
-        public TapetiPublisher(TapetiWorker worker)
+        public TapetiPublisher(Func<TapetiWorker> workerFactory)
         {
-            this.worker = worker;
+            this.workerFactory = workerFactory;
         }
 
 
         public Task Publish(object message)
         {
-            return worker.Publish(message);
+            return workerFactory().Publish(message);
         }
     }
 }

Connection/TapetiSubscriber.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 
@@ -6,18 +7,18 @@ namespace Tapeti.Connection
 {
     public class TapetiSubscriber : ISubscriber
     {
-        private readonly TapetiWorker worker;
+        private readonly Func<TapetiWorker> workerFactory;
 
 
-        public TapetiSubscriber(TapetiWorker worker)
+        public TapetiSubscriber(Func<TapetiWorker> workerFactory)
         {
-            this.worker = worker;
+            this.workerFactory = workerFactory;
         }
 
 
         public async Task BindQueues(IEnumerable<IQueueRegistration> registrations)
         {
-            await Task.WhenAll(registrations.Select(registration => worker.Subscribe(registration)).ToList());
+            await Task.WhenAll(registrations.Select(registration => workerFactory().Subscribe(registration)).ToList());
         }
     }
 }

Default/DefaultDependencyResolver.cs

@@ -15,12 +15,12 @@ namespace Tapeti.Default
         private readonly Lazy<DefaultRoutingKeyStrategy> routingKeyStrategy = new Lazy<DefaultRoutingKeyStrategy>();
         private readonly Lazy<DefaultMessageSerializer> messageSerializer = new Lazy<DefaultMessageSerializer>();
         private readonly Lazy<ILogger> logger;
+        private IPublisher publisher;
 
 
-
-        public DefaultDependencyResolver(Func<IPublisher> publisherFactory)
+        public DefaultDependencyResolver()
         {
-            controllerFactory = new Lazy<DefaultControllerFactory>(() => new DefaultControllerFactory(publisherFactory));
+            controllerFactory = new Lazy<DefaultControllerFactory>(() => new DefaultControllerFactory(() => publisher));
 
             logger = new Lazy<ILogger>(() =>
             {
@@ -58,6 +58,12 @@ namespace Tapeti.Default
         }
 
 
+        public void RegisterPublisher(IPublisher value)
+        {
+            publisher = value;
+        }
+
+
         public void RegisterController(Type type)
         {
             controllerFactory.Value.RegisterController(type);

IDependencyResolver.cs

@@ -10,6 +10,7 @@ namespace Tapeti
 
     public interface IDependencyInjector : IDependencyResolver
     {
+        void RegisterPublisher(IPublisher publisher);
         void RegisterController(Type type);
     }
 }

MessageController.cs

@@ -0,0 +1,16 @@
+using Tapeti.Annotations;
+
+namespace Tapeti
+{
+    /// <summary>
+    /// Base class for message controllers
+    /// </summary>
+    /// <remarks>
+    /// Using this base class is not required, you can add the MessageController attribute
+    /// to any class.
+    /// </remarks>
+    [MessageController]
+    public abstract class MessageController
+    {
+    }
+}

README.md

@@ -1,3 +1,14 @@
-'Small to medium-sized and classified as "Least Concern" by the IUCN.'
+# Tapeti
+> 'Small to medium-sized and classified as "Least Concern" by the IUCN.'
+>
+> [_Wikipedia_](https://en.wikipedia.org/wiki/Tapeti)
 
-- Wikipedia
+Tapeti is a wrapper for the RabbitMQ .NET client designed for long-running microservices with a few specific goals:
+
+1. Automatic registration of message handlers
+2. Publishing without transport details
+  * Routing key generated based on class name
+  * One exchange (per service / group of services) to publish them all
+3. Attribute based, no base class requirements (only for convenience)
+4. Graceful handling of connection issues, even at startup
+5. Basic Saga support

Tapeti.SimpleInjector/SimpleInjectorDependencyResolver.cs

@@ -1,4 +1,5 @@
-using System.Linq;
+using System;
+using System.Linq;
 using System.Reflection;
 using SimpleInjector;
 using Tapeti.Annotations;
@@ -7,7 +8,7 @@ using System.Collections.Generic;
 
 namespace Tapeti.SimpleInjector
 {
-    public class SimpleInjectorDependencyResolver : IDependencyResolver
+    public class SimpleInjectorDependencyResolver : IDependencyResolver, IDependencyInjector
     {
         private readonly Container container;
 
@@ -25,6 +26,18 @@ namespace Tapeti.SimpleInjector
         }
 
 
+        public void RegisterPublisher(IPublisher publisher)
+        {
+            IfUnregistered<IPublisher>(container.GetCurrentRegistrations(), () => container.RegisterSingleton(publisher));
+        }
+
+
+        public void RegisterController(Type type)
+        {
+            container.Register(type);
+        }
+
+
         public SimpleInjectorDependencyResolver RegisterDefaults()
         {
             var currentRegistrations = container.GetCurrentRegistrations();
@@ -37,20 +50,18 @@ namespace Tapeti.SimpleInjector
         }
 
 
-        public SimpleInjectorDependencyResolver RegisterAllControllers(Assembly assembly)
-        {
-            foreach (var type in assembly.GetTypes().Where(t => t.IsDefined(typeof(QueueAttribute))))
-                container.Register(type);
-
-            return this;
-        }
-
-
         private void IfUnregistered<TService, TImplementation>(IEnumerable<InstanceProducer> currentRegistrations) where TService : class where TImplementation: class, TService
         {
             // ReSharper disable once SimplifyLinqExpression - not a fan of negative predicates
             if (!currentRegistrations.Any(ip => ip.ServiceType == typeof(TService)))
                 container.Register<TService, TImplementation>();
         }
+
+        private void IfUnregistered<TService>(IEnumerable<InstanceProducer> currentRegistrations, Action register) where TService : class
+        {
+            // ReSharper disable once SimplifyLinqExpression - not a fan of negative predicates
+            if (!currentRegistrations.Any(ip => ip.ServiceType == typeof(TService)))
+                register();
+        }
     }
 }

Tapeti.csproj

@@ -50,7 +50,9 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Annotations\ExchangeAttribute.cs" />
-    <Compile Include="Annotations\QueueAttribute.cs" />
+    <Compile Include="Annotations\MessageControllerAttribute.cs" />
+    <Compile Include="Annotations\StaticQueueAttribute.cs" />
+    <Compile Include="Annotations\DynamicQueueAttribute.cs" />
     <Compile Include="Connection\TapetiConsumer.cs" />
     <Compile Include="Connection\TapetiPublisher.cs" />
     <Compile Include="Connection\TapetiSubscriber.cs" />
@@ -58,6 +60,7 @@
     <Compile Include="Default\ConsoleLogger.cs" />
     <Compile Include="Default\DevNullLogger.cs" />
     <Compile Include="ILogger.cs" />
+    <Compile Include="MessageController.cs" />
     <Compile Include="TapetiConnectionExtensions.cs" />
     <Compile Include="TapetiConnectionParams.cs" />
     <Compile Include="TapetiTypes.cs" />

TapetiConnection.cs

@@ -19,8 +19,20 @@ namespace Tapeti
 
         public IDependencyResolver DependencyResolver
         {
-            get { return dependencyResolver ?? (dependencyResolver = new DefaultDependencyResolver(GetPublisher)); }
-            set { dependencyResolver = value; }
+            get
+            {
+                if (dependencyResolver == null)
+                    DependencyResolver = new DefaultDependencyResolver();
+
+                return dependencyResolver;
+            }
+            set
+            {
+                dependencyResolver = value;
+
+                var dependencyInjector = value as IDependencyInjector;
+                dependencyInjector?.RegisterPublisher(GetPublisher());
+            }
         }
 
 
@@ -43,14 +55,14 @@ namespace Tapeti
 
         public TapetiConnection WithDependencyResolver(IDependencyResolver resolver)
         {
-            dependencyResolver = resolver;
+            DependencyResolver = resolver;
             return this;
         }
 
 
         public TapetiConnection RegisterController(Type type)
         {
-            var queueAttribute = type.GetCustomAttribute<QueueAttribute>();
+            var queueAttribute = type.GetCustomAttribute<MessageController>();
             if (queueAttribute == null)
                 throw new ArgumentException("Queue attribute required on class", nameof(type));
 
@@ -84,7 +96,7 @@ namespace Tapeti
             if (!registrations.IsValueCreated || registrations.Value.Count == 0)
                 throw new ArgumentException("No controllers registered");
 
-            var subscriber = new TapetiSubscriber(worker.Value);
+            var subscriber = new TapetiSubscriber(() => worker.Value);
             await subscriber.BindQueues(registrations.Value);
 
             return subscriber;
@@ -93,7 +105,7 @@ namespace Tapeti
 
         public IPublisher GetPublisher()
         {
-            return new TapetiPublisher(worker.Value);
+            return new TapetiPublisher(() => worker.Value);
         }
 
 

TapetiConnectionExtensions.cs

@@ -8,7 +8,7 @@ namespace Tapeti
     {
         public static TapetiConnection RegisterAllControllers(this TapetiConnection connection, Assembly assembly)
         {
-            foreach (var type in assembly.GetTypes().Where(t => t.IsDefined(typeof(QueueAttribute))))
+            foreach (var type in assembly.GetTypes().Where(t => t.IsDefined(typeof(DynamicQueueAttribute))))
                 connection.RegisterController(type);
 
             return connection;

Test/MarcoEmitter.cs

@@ -0,0 +1,37 @@
+using System.Threading;
+using System.Threading.Tasks;
+using Tapeti;
+
+namespace Test
+{
+    public class MarcoEmitter
+    {
+        private readonly IPublisher publisher;
+
+
+        public MarcoEmitter(IPublisher publisher)
+        {
+            this.publisher = publisher;
+        }
+
+
+        public async Task Run()
+        {
+            var concurrent = new SemaphoreSlim(20);
+
+            //for (var x = 0; x < 5000; x++)
+            while (true)
+            {
+                await concurrent.WaitAsync();
+                try
+                {
+                    await publisher.Publish(new MarcoMessage());
+                }
+                finally
+                {
+                    concurrent.Release();
+                }
+            }
+        }
+    }
+}

Test/Program.cs

@@ -19,19 +19,14 @@ namespace Test
                 .WithDependencyResolver(new SimpleInjectorDependencyResolver(container))
                 .RegisterAllControllers(typeof(Program).Assembly))
             {
-                container.Register(() => connection.GetPublisher());
+                container.Register<MarcoEmitter>();
     
                 Console.WriteLine("Subscribing...");
                 connection.Subscribe().Wait();
                 Console.WriteLine("Done!");
 
-                var publisher = connection.GetPublisher();
-
-                //for (var x = 0; x < 5000; x++)
-                while(true)
-                    publisher.Publish(new MarcoMessage()).Wait();
-
-                //Console.ReadLine();
+                var emitter = container.GetInstance<MarcoEmitter>();
+                emitter.Run().Wait();
             }
         }
     }

Test/Test.csproj

@@ -48,6 +48,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="MarcoEmitter.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="TestQueueController.cs" />

Test/TestQueueController.cs

@@ -5,10 +5,8 @@ using Tapeti.Annotations;
 
 namespace Test
 {
-    //[Exchange("myexchange")]
-    //[Queue("staticqueue")]
-    [Queue]
-    public class TestQueueController
+    [DynamicQueue]
+    public class TestQueueController : MessageController
     {
         private readonly IPublisher publisher;
 
@@ -19,10 +17,10 @@ namespace Test
         }
 
        
-        public async Task Marco(MarcoMessage message)
+        public PoloMessage Marco(MarcoMessage message)
         {
             Console.WriteLine("Marco!");
-            await publisher.Publish(new PoloMessage());
+            return new PoloMessage();
         }