Added workflow sample: Monitor

Directory.Packages.props

@@ -29,10 +29,11 @@
         <PackageVersion Include="Microsoft.Extensions.Configuration" Version="6.0.1" />
         <PackageVersion Include="Microsoft.Extensions.Configuration.Abstractions" Version="6.0.0" />
         <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="6.0.1" />
-      <PackageVersion Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="6.0.0" />
+        <PackageVersion Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="6.0.0" />
+        <PackageVersion Include="Microsoft.Extensions.Hosting" Version="6.0.1" />
+        <PackageVersion Include="Microsoft.Extensions.Http" Version="6.0.0" />
         <PackageVersion Include="Microsoft.Extensions.Logging" Version="6.0.0" />
         <PackageVersion Include="Microsoft.Extensions.Logging.Abstractions" Version="6.0.4" />
-        <PackageVersion Include="Microsoft.Extensions.Http" Version="6.0.0" />
         <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="16.8.3" />
         <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="1.1.1" />
         <PackageVersion Include="MinVer" Version="2.3.0" />

all.sln

@@ -119,11 +119,14 @@ 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}") = "WorkflowMonitor", "examples\Workflow\WorkflowMonitor\WorkflowMonitor.csproj", "{7F73A3D8-FFC2-4E31-AA3D-A4840316A8C6}"
+EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Dapr.Messaging.Test", "test\Dapr.Messaging.Test\Dapr.Messaging.Test.csproj", "{4E04EB35-7FD2-4FDB-B09A-F75CE24053B9}"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Dapr.Messaging", "src\Dapr.Messaging\Dapr.Messaging.csproj", "{0EAE36A1-B578-4F13-A113-7A477ECA1BDA}"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "StreamingSubscriptionExample", "examples\Client\PublishSubscribe\StreamingSubscriptionExample\StreamingSubscriptionExample.csproj", "{290D1278-F613-4DF3-9DF5-F37E38CDC363}"
+EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Dapr.Jobs", "src\Dapr.Jobs\Dapr.Jobs.csproj", "{C8BB6A85-A7EA-40C0-893D-F36F317829B3}"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Dapr.Jobs.Test", "test\Dapr.Jobs.Test\Dapr.Jobs.Test.csproj", "{BF9828E9-5597-4D42-AA6E-6E6C12214204}"
@@ -316,6 +319,10 @@ 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
+		{7F73A3D8-FFC2-4E31-AA3D-A4840316A8C6}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7F73A3D8-FFC2-4E31-AA3D-A4840316A8C6}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7F73A3D8-FFC2-4E31-AA3D-A4840316A8C6}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7F73A3D8-FFC2-4E31-AA3D-A4840316A8C6}.Release|Any CPU.Build.0 = Release|Any CPU
 		{4E04EB35-7FD2-4FDB-B09A-F75CE24053B9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{4E04EB35-7FD2-4FDB-B09A-F75CE24053B9}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{4E04EB35-7FD2-4FDB-B09A-F75CE24053B9}.Release|Any CPU.ActiveCfg = Release|Any CPU
@@ -396,6 +403,7 @@ 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}
+		{7F73A3D8-FFC2-4E31-AA3D-A4840316A8C6} = {BF3ED6BF-ADF3-4D25-8E89-02FB8D945CA9}
 		{4E04EB35-7FD2-4FDB-B09A-F75CE24053B9} = {DD020B34-460F-455F-8D17-CF4A949F100B}
 		{0EAE36A1-B578-4F13-A113-7A477ECA1BDA} = {27C5D71D-0721-4221-9286-B94AB07B58CF}
 		{290D1278-F613-4DF3-9DF5-F37E38CDC363} = {0EF6EA64-D7C3-420D-9890-EAE8D54A57E6}

examples/Workflow/WorkflowMonitor/Activities/CheckStatus.cs

@@ -0,0 +1,31 @@
+// ------------------------------------------------------------------------
+// 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 WorkflowMonitor.Activities;
+
+internal sealed class CheckStatus : WorkflowActivity<bool, string>
+{
+    private static List<string> status = new List<string> { "healthy", "unhealthy" };
+    private Random random = new();
+
+    /// <summary>
+    /// Override to implement async (non-blocking) workflow activity logic.
+    /// </summary>
+    /// <param name="context">Provides access to additional context for the current activity execution.</param>
+    /// <param name="input">The deserialized activity input.</param>
+    /// <returns>The output of the activity as a task.</returns>
+    public override Task<string> RunAsync(WorkflowActivityContext context, bool input) =>
+        Task.FromResult<string>(status[random.Next(status.Count)]);
+}

examples/Workflow/WorkflowMonitor/Program.cs

@@ -0,0 +1,39 @@
+// ------------------------------------------------------------------------
+// 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 WorkflowMonitor.Activities;
+using WorkflowMonitor.Workflows;
+
+var builder = Host.CreateDefaultBuilder(args).ConfigureServices(services =>
+{
+    services.AddDaprWorkflow(options =>
+    {
+        options.RegisterWorkflow<DemoWorkflow>();
+        options.RegisterActivity<CheckStatus>();
+    });
+});
+
+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]}";
+var isHealthy = true;
+await daprWorkflowClient.ScheduleNewWorkflowAsync(nameof(DemoWorkflow), instanceId, isHealthy);
+
+//We don't want to block on workflow completion as this workflow will never complete

examples/Workflow/WorkflowMonitor/WorkflowMonitor.csproj

@@ -0,0 +1,18 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net6.0</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/WorkflowMonitor/Workflows/DemoWorkflow.cs

@@ -0,0 +1,57 @@
+// ------------------------------------------------------------------------
+// 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 WorkflowMonitor.Activities;
+
+namespace WorkflowMonitor.Workflows;
+
+internal sealed class DemoWorkflow : Workflow<bool, bool>
+{
+    /// <summary>
+    /// Override to implement workflow logic.
+    /// </summary>
+    /// <param name="context">The workflow context.</param>
+    /// <param name="isHealthy">The deserialized workflow input.</param>
+    /// <returns>The output of the workflow as a task.</returns>
+    public override async Task<bool> RunAsync(WorkflowContext context, bool isHealthy)
+    {
+        string status = await context.CallActivityAsync<string>(nameof(CheckStatus), true);
+        int next_sleep_interval;
+        if (!context.IsReplaying)
+        {
+            Console.WriteLine($"This job is {status}");
+        }
+
+        if (status == "healthy")
+        {
+            isHealthy = true;
+            next_sleep_interval = 30;
+        }
+        else
+        {
+            if (isHealthy)
+            {
+                isHealthy = false;
+            }
+            Console.WriteLine("Status is unhealthy. Set check interval to 5s");
+            next_sleep_interval = 5;
+        }
+
+        await context.CreateTimer(TimeSpan.FromSeconds(next_sleep_interval));
+        context.ContinueAsNew(isHealthy);
+
+        //This workflow will never complete
+        return true;
+    }
+}