Added workflow sample: Sub-workflows (#1395)

* Added Workflow with sub-workflow

Signed-off-by: Whit Waldo <whit.waldo@innovian.net>

* Removed duplicate package version reference

Signed-off-by: Whit Waldo <whit.waldo@innovian.net>

---------

Signed-off-by: Whit Waldo <whit.waldo@innovian.net>
Signed-off-by: Siri Varma Vegiraju <svegiraju@microsoft.com>

all.sln

@@ -119,6 +119,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Dapr.Common", "src\Dapr.Com
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Dapr.Common.Test", "test\Dapr.Common.Test\Dapr.Common.Test.csproj", "{CDB47863-BEBD-4841-A807-46D868962521}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WorkflowSubworkflow", "examples\Workflow\WorkflowSubworkflow\WorkflowSubworkflow.csproj", "{FD3E9371-3134-4235-8E80-32226DFB4B1F}"
+EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WorkflowFanOutFanIn", "examples\Workflow\WorkflowFanOutFanIn\WorkflowFanOutFanIn.csproj", "{D83B27F3-4401-42F5-843E-147566B4999A}"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WorkflowAsyncOperations", "examples\Workflow\WorkflowAsyncOperations\WorkflowAsyncOperations.csproj", "{00359961-0C50-4BB1-A794-8B06DE991639}"
@@ -321,6 +323,10 @@ Global
 		{CDB47863-BEBD-4841-A807-46D868962521}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{CDB47863-BEBD-4841-A807-46D868962521}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{CDB47863-BEBD-4841-A807-46D868962521}.Release|Any CPU.Build.0 = Release|Any CPU
+		{FD3E9371-3134-4235-8E80-32226DFB4B1F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{FD3E9371-3134-4235-8E80-32226DFB4B1F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{FD3E9371-3134-4235-8E80-32226DFB4B1F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{FD3E9371-3134-4235-8E80-32226DFB4B1F}.Release|Any CPU.Build.0 = Release|Any CPU
 		{D83B27F3-4401-42F5-843E-147566B4999A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{D83B27F3-4401-42F5-843E-147566B4999A}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{D83B27F3-4401-42F5-843E-147566B4999A}.Release|Any CPU.ActiveCfg = Release|Any CPU
@@ -409,6 +415,7 @@ Global
 		{DFBABB04-50E9-42F6-B470-310E1B545638} = {27C5D71D-0721-4221-9286-B94AB07B58CF}
 		{B445B19C-A925-4873-8CB7-8317898B6970} = {27C5D71D-0721-4221-9286-B94AB07B58CF}
 		{CDB47863-BEBD-4841-A807-46D868962521} = {DD020B34-460F-455F-8D17-CF4A949F100B}
+		{FD3E9371-3134-4235-8E80-32226DFB4B1F} = {BF3ED6BF-ADF3-4D25-8E89-02FB8D945CA9}
 		{D83B27F3-4401-42F5-843E-147566B4999A} = {BF3ED6BF-ADF3-4D25-8E89-02FB8D945CA9}
 		{00359961-0C50-4BB1-A794-8B06DE991639} = {BF3ED6BF-ADF3-4D25-8E89-02FB8D945CA9}
 		{4E04EB35-7FD2-4FDB-B09A-F75CE24053B9} = {DD020B34-460F-455F-8D17-CF4A949F100B}

examples/Workflow/WorkflowSubworkflow/Program.cs

@@ -0,0 +1,42 @@
+// ------------------------------------------------------------------------
+// Copyright 2024 The Dapr Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//     http://www.apache.org/licenses/LICENSE-2.0
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// ------------------------------------------------------------------------
+
+using Dapr.Workflow;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using WorkflowSubWorkflow.Workflows;
+
+var builder = Host.CreateDefaultBuilder(args).ConfigureServices(services =>
+{
+    services.AddDaprWorkflow(options =>
+    {
+        options.RegisterWorkflow<DemoWorkflow>();
+        options.RegisterWorkflow<DemoSubWorkflow>();
+    });
+});
+
+using var host = builder.Build();
+await host.StartAsync();
+
+await using var scope = host.Services.CreateAsyncScope();
+var daprWorkflowClient = scope.ServiceProvider.GetRequiredService<DaprWorkflowClient>();
+
+var instanceId = $"demo-workflow-{Guid.NewGuid().ToString()[..8]}";
+await daprWorkflowClient.ScheduleNewWorkflowAsync(nameof(DemoWorkflow), instanceId, instanceId );
+
+await daprWorkflowClient.WaitForWorkflowCompletionAsync(instanceId);
+var state = await daprWorkflowClient.GetWorkflowStateAsync(instanceId);
+Console.WriteLine($"Workflow {instanceId}, state: {state.RuntimeStatus}");
+
+state = await daprWorkflowClient.GetWorkflowStateAsync($"{instanceId}-sub");
+Console.WriteLine($"Workflow {instanceId}-sub, state: {state.RuntimeStatus}");

examples/Workflow/WorkflowSubworkflow/WorkflowSubworkflow.csproj

@@ -0,0 +1,18 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net8.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\..\..\src\Dapr.Workflow\Dapr.Workflow.csproj" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <PackageReference Include="Microsoft.Extensions.Hosting" />
+    </ItemGroup>
+
+</Project>

examples/Workflow/WorkflowSubworkflow/Workflows/DemoSubWorkflow.cs

@@ -0,0 +1,33 @@
+// ------------------------------------------------------------------------
+// Copyright 2024 The Dapr Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//     http://www.apache.org/licenses/LICENSE-2.0
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// ------------------------------------------------------------------------
+
+using Dapr.Workflow;
+
+namespace WorkflowSubWorkflow.Workflows;
+
+internal sealed class DemoSubWorkflow : Workflow<string, bool>
+{
+    /// <summary>
+    /// Override to implement workflow logic.
+    /// </summary>
+    /// <param name="context">The workflow context.</param>
+    /// <param name="instanceId">The deserialized workflow input.</param>
+    /// <returns>The output of the workflow as a task.</returns>
+    public override async Task<bool> RunAsync(WorkflowContext context, string instanceId)
+    {
+        Console.WriteLine($"Workflow {context.InstanceId} started");
+        Console.WriteLine($"Received input: {instanceId}");
+        await context.CreateTimer(TimeSpan.FromSeconds(5));
+        return true;
+    }
+}

examples/Workflow/WorkflowSubworkflow/Workflows/DemoWorkflow.cs

@@ -0,0 +1,34 @@
+// ------------------------------------------------------------------------
+// Copyright 2024 The Dapr Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//     http://www.apache.org/licenses/LICENSE-2.0
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// ------------------------------------------------------------------------
+
+using Dapr.Workflow;
+
+namespace WorkflowSubWorkflow.Workflows;
+
+internal sealed class DemoWorkflow : Workflow<string, bool>
+{
+    /// <summary>
+    /// Override to implement workflow logic.
+    /// </summary>
+    /// <param name="context">The workflow context.</param>
+    /// <param name="instanceId">The deserialized workflow input.</param>
+    /// <returns>The output of the workflow as a task.</returns>
+    public override async Task<bool> RunAsync(WorkflowContext context, string instanceId)
+    {
+        Console.WriteLine($"Workflow {instanceId} started");
+        var subInstanceId = instanceId + "-sub";
+        var options = new ChildWorkflowTaskOptions(subInstanceId);
+        await context.CallChildWorkflowAsync<bool>(nameof(DemoSubWorkflow), "Hello, sub-workflow", options);
+        return true;
+    }
+}