Refactor workflow runtime structure and update handlers.

Moved `CancelWorkflowsCommandHandler` to the shared runtime module. Updated related project references, features, and configurations accordingly. Improved `WorkflowInstance` actor to save state using `IWorkflowInstanceManager`.

src/apps/Elsa.Server.Web/Program.cs

@@ -74,7 +74,7 @@ const bool useAzureServiceBus = false;
 const bool useKafka = false;
 const bool useReadOnlyMode = false;
 const bool useSignalR = false; // Disabled until Elsa Studio sends authenticated requests.
-const WorkflowRuntime workflowRuntime = WorkflowRuntime.Distributed;
+const WorkflowRuntime workflowRuntime = WorkflowRuntime.ProtoActor;
 const DistributedCachingTransport distributedCachingTransport = DistributedCachingTransport.MassTransit;
 const MassTransitBroker massTransitBroker = MassTransitBroker.Memory;
 const bool useMultitenancy = false;

src/modules/Elsa.Workflows.Runtime.Distributed/Elsa.Workflows.Runtime.Distributed.csproj

@@ -18,4 +18,8 @@
       <ProjectReference Include="..\Elsa.Workflows.Runtime\Elsa.Workflows.Runtime.csproj" />
     </ItemGroup>
 
+    <ItemGroup>
+      <Folder Include="Handlers\" />
+    </ItemGroup>
+
 </Project>

src/modules/Elsa.Workflows.Runtime.Distributed/Features/DistributedRuntimeFeature.cs

@@ -2,8 +2,8 @@ using Elsa.Extensions;
 using Elsa.Features.Abstractions;
 using Elsa.Features.Attributes;
 using Elsa.Features.Services;
-using Elsa.Workflows.Runtime.Distributed.Handlers;
 using Elsa.Workflows.Runtime.Features;
+using Elsa.Workflows.Runtime.Handlers;
 using Microsoft.Extensions.DependencyInjection;
 
 namespace Elsa.Workflows.Runtime.Distributed.Features;

src/modules/Elsa.Workflows.Runtime.ProtoActor/Actors/WorkflowInstance.cs

@@ -211,6 +211,8 @@ internal class WorkflowInstance(
         var workflowRunner = scope.ServiceProvider.GetRequiredService<IWorkflowRunner>();
         var workflowResult = await workflowRunner.RunAsync(WorkflowGraph, WorkflowState, runWorkflowOptions, _linkedCancellationToken);
         WorkflowState = workflowResult.WorkflowState;
+        var workflowInstanceManager = scope.ServiceProvider.GetRequiredService<IWorkflowInstanceManager>();
+        await workflowInstanceManager.SaveAsync(WorkflowState, Context.CancellationToken);
 
         return workflowResult;
     }

src/modules/Elsa.Workflows.Runtime/Features/DefaultWorkflowRuntimeFeature.cs

@@ -8,15 +8,4 @@ namespace Elsa.Workflows.Runtime.Features;
 /// Installs the default runtime services.
 /// </summary>
 [DependsOn(typeof(WorkflowRuntimeFeature))]
-public class DefaultWorkflowRuntimeFeature : FeatureBase
-{
-    /// <inheritdoc />
-    public DefaultWorkflowRuntimeFeature(IModule module) : base(module)
-    {
-    }
-
-    /// <inheritdoc />
-    public override void Apply()
-    {
-    }
-}
+public class DefaultWorkflowRuntimeFeature(IModule module) : FeatureBase(module);

src/modules/Elsa.Workflows.Runtime/Features/WorkflowRuntimeFeature.cs

@@ -310,6 +310,7 @@ public class WorkflowRuntimeFeature : FeatureBase
 
             // Domain handlers.
             .AddCommandHandler<DispatchWorkflowCommandHandler>()
+            .AddCommandHandler<CancelWorkflowsCommandHandler>()
             .AddNotificationHandler<ResumeDispatchWorkflowActivity>()
             .AddNotificationHandler<ResumeBulkDispatchWorkflowActivity>()
             .AddNotificationHandler<ResumeExecuteWorkflowActivity>()

src/modules/Elsa.Workflows.Runtime/Handlers/CancelWorkflowsCommandHandler.cs

@@ -2,7 +2,7 @@ using Elsa.Mediator.Contracts;
 using Elsa.Mediator.Models;
 using Elsa.Workflows.Runtime.Commands;
 
-namespace Elsa.Workflows.Runtime.Distributed.Handlers;
+namespace Elsa.Workflows.Runtime.Handlers;
 
 /// <summary>
 /// Handles the <see cref="CancelWorkflowsCommand"/>.