init backend

dotnet/AipsCore/Application/Abstract/Command/ICommand.cs

@@ -0,0 +1,5 @@
+namespace AipsCore.Application.Abstract.Command;
+
+public interface ICommand {}
+
+public interface ICommand<TResult> {}

dotnet/AipsCore/Application/Abstract/Command/ICommandHandler.cs

@@ -0,0 +1,13 @@
+namespace AipsCore.Application.Abstract.Command;
+
+public interface ICommandHandler<in TCommand>
+    where TCommand : ICommand
+{
+    Task Handle(TCommand command, CancellationToken cancellationToken = default);
+}
+
+public interface ICommandHandler<in TCommand, TResult>
+    where TCommand : ICommand<TResult>
+{
+    Task<TResult> Handle(TCommand command, CancellationToken cancellationToken = default);
+}

dotnet/AipsCore/Application/Abstract/Query/IQuery.cs

@@ -0,0 +1,3 @@
+namespace AipsCore.Application.Abstract.Query;
+
+public interface IQuery<TResult> {}

dotnet/AipsCore/Application/Abstract/Query/IQueryHandler.cs

@@ -0,0 +1,7 @@
+namespace AipsCore.Application.Abstract.Query;
+
+public interface IQueryHandler<in TQuery, TResult>
+    where TQuery : IQuery<TResult>
+{
+    Task<TResult> HandleAsync(TQuery query, CancellationToken cancellationToken = default);
+}