Allowed contravariance in actor messages

Nixie/IActor.cs

@@ -5,7 +5,7 @@ namespace Nixie;
 /// This interface must be implemented by all actors that do not return a response.
 /// </summary>
 /// <typeparam name="TRequest"></typeparam>
-public interface IActor<TRequest> where TRequest : class
+public interface IActor<in TRequest> where TRequest : class
 {
     public Task Receive(TRequest message);
 }

Nixie/IActorStruct.cs

@@ -6,7 +6,7 @@ namespace Nixie;
 /// This actor type supports struct request messages.
 /// </summary>
 /// <typeparam name="TRequest"></typeparam>
-public interface IActorStruct<TRequest> where TRequest : struct
+public interface IActorStruct<in TRequest> where TRequest : struct
 {
     public Task Receive(TRequest message);
 }

Nixie/IActorStructReply.cs

@@ -6,7 +6,7 @@ namespace Nixie;
 /// </summary>
 /// <typeparam name="TRequest"></typeparam>
 /// <typeparam name="TResponse"></typeparam>
-public interface IActorStruct<TRequest, TResponse> where TRequest : struct where TResponse : struct
+public interface IActorStruct<in TRequest, TResponse> where TRequest : struct where TResponse : struct
 {
     /// <summary>
     /// Passes a message to the actor and returns a response.

Nixie/LazyTaskMethodBuilder.cs

@@ -7,7 +7,7 @@ namespace Nixie;
 
 public class LazyTaskMethodBuilder<T>
 {
-    public LazyTaskMethodBuilder() => Task = new LazyTask<T>();
+    public LazyTaskMethodBuilder() => Task = new();
 
     public static LazyTaskMethodBuilder<T> Create() => new();
 

Nixie/Nixie.csproj

@@ -9,7 +9,7 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <PackageId>Nixie</PackageId>
-    <Version>1.0.4</Version>
+    <Version>1.0.5</Version>
     <Description>A Lightweight Actor Model Implementation for C#/.NET</Description>
     <Authors>Andres Gutierrez</Authors>
     <Company>Andres Gutierrez</Company>    

Nixie/Routers/ActorSystemExtensionsStruct.cs

@@ -226,6 +226,27 @@ List<IActorRefStruct<TActor, TRequest>> instances
     {
         return actorSystem.SpawnStruct<ConsistentHashActorStruct<TActor, TRequest>, TRequest>(null, instances);
     }
+
+    /// <summary>
+    /// Creates a Consistent Hash router specifying name and a list of instances
+    /// </summary>
+    /// <typeparam name="TActor"></typeparam>
+    /// <typeparam name="TRequest"></typeparam>
+    /// <typeparam name="TResponse"></typeparam>
+    /// <param name="actorSystem"></param>
+    /// <param name="name"></param>
+    /// <param name="instances"></param>
+    /// <returns></returns>
+    public static IActorRefStruct<ConsistentHashActorStruct<TActor, TRequest>, TRequest>
+        CreateConsistentHashRouterStruct<TActor, TRequest>(
+            this ActorSystem actorSystem,
+            string name,
+            List<IActorRefStruct<TActor, TRequest>> instances
+        )
+        where TActor : IActorStruct<TRequest> where TRequest : struct, IConsistentHashable
+    {
+        return actorSystem.SpawnStruct<ConsistentHashActorStruct<TActor, TRequest>, TRequest>(name, instances);
+    }
 
     /// <summary>
     /// Creates a Consistent Hash router specifying name and number of instances

README.md

@@ -35,15 +35,15 @@ To install Nixie into your C#/.NET project, you can use the .NET CLI or the NuGe
 #### Using .NET CLI
 
 ```shell
-dotnet add package Nixie --version 1.0.4
+dotnet add package Nixie --version 1.0.5
 ```
 
 ### Using NuGet Package Manager
 
 Search for Nixie and install it from the NuGet package manager UI, or use the Package Manager Console:
 
 ```shell
-Install-Package Nixie -Version 1.0.4
+Install-Package Nixie -Version 1.0.5
 ```
 
 ## Usage