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Added workflow example: Fan out/fan in (dapr#1396)
* Added workflow fan out/fan in example Signed-off-by: Whit Waldo <[email protected]> * Added copyright headers Signed-off-by: Whit Waldo <[email protected]> --------- Signed-off-by: Whit Waldo <[email protected]> Signed-off-by: Siri Varma Vegiraju <[email protected]>
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‎all.sln‎

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@@ -119,6 +119,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Dapr.Common", "src\Dapr.Com
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Dapr.Common.Test", "test\Dapr.Common.Test\Dapr.Common.Test.csproj", "{CDB47863-BEBD-4841-A807-46D868962521}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WorkflowFanOutFanIn", "examples\Workflow\WorkflowFanOutFanIn\WorkflowFanOutFanIn.csproj", "{D83B27F3-4401-42F5-843E-147566B4999A}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WorkflowAsyncOperations", "examples\Workflow\WorkflowAsyncOperations\WorkflowAsyncOperations.csproj", "{00359961-0C50-4BB1-A794-8B06DE991639}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Dapr.Messaging.Test", "test\Dapr.Messaging.Test\Dapr.Messaging.Test.csproj", "{4E04EB35-7FD2-4FDB-B09A-F75CE24053B9}"
@@ -319,6 +321,10 @@ Global
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{CDB47863-BEBD-4841-A807-46D868962521}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{CDB47863-BEBD-4841-A807-46D868962521}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{CDB47863-BEBD-4841-A807-46D868962521}.Release|Any CPU.Build.0 = Release|Any CPU
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{D83B27F3-4401-42F5-843E-147566B4999A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{D83B27F3-4401-42F5-843E-147566B4999A}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{D83B27F3-4401-42F5-843E-147566B4999A}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{D83B27F3-4401-42F5-843E-147566B4999A}.Release|Any CPU.Build.0 = Release|Any CPU
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{00359961-0C50-4BB1-A794-8B06DE991639}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{00359961-0C50-4BB1-A794-8B06DE991639}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{00359961-0C50-4BB1-A794-8B06DE991639}.Release|Any CPU.ActiveCfg = Release|Any CPU
@@ -403,6 +409,7 @@ Global
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{DFBABB04-50E9-42F6-B470-310E1B545638} = {27C5D71D-0721-4221-9286-B94AB07B58CF}
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{B445B19C-A925-4873-8CB7-8317898B6970} = {27C5D71D-0721-4221-9286-B94AB07B58CF}
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{CDB47863-BEBD-4841-A807-46D868962521} = {DD020B34-460F-455F-8D17-CF4A949F100B}
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{D83B27F3-4401-42F5-843E-147566B4999A} = {BF3ED6BF-ADF3-4D25-8E89-02FB8D945CA9}
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{00359961-0C50-4BB1-A794-8B06DE991639} = {BF3ED6BF-ADF3-4D25-8E89-02FB8D945CA9}
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{4E04EB35-7FD2-4FDB-B09A-F75CE24053B9} = {DD020B34-460F-455F-8D17-CF4A949F100B}
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{0EAE36A1-B578-4F13-A113-7A477ECA1BDA} = {27C5D71D-0721-4221-9286-B94AB07B58CF}

‎examples/Workflow/WorkflowFanOutFanIn/Activities/NotifyActivity.cs‎

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// ------------------------------------------------------------------------
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// Copyright 2024 The Dapr Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// ------------------------------------------------------------------------
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using Dapr.Workflow;
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namespace WorkflowFanOutFanIn.Activities;
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internal sealed class NotifyActivity : WorkflowActivity<string, object?>
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{
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/// <summary>
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/// Override to implement async (non-blocking) workflow activity logic.
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/// </summary>
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/// <param name="context">Provides access to additional context for the current activity execution.</param>
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/// <param name="input">The deserialized activity input.</param>
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/// <returns>The output of the activity as a task.</returns>
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public override Task<object?> RunAsync(WorkflowActivityContext context, string input)
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{
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Console.WriteLine(input);
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return Task.FromResult<object?>(null);
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}
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}

‎examples/Workflow/WorkflowFanOutFanIn/Program.cs‎

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

‎examples/Workflow/WorkflowFanOutFanIn/WorkflowFanOutFanIn.csproj‎

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

‎examples/Workflow/WorkflowFanOutFanIn/Workflows/DemoWorkflow.cs‎

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// ------------------------------------------------------------------------
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// Copyright 2024 The Dapr Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// ------------------------------------------------------------------------
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using Dapr.Workflow;
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using WorkflowFanOutFanIn.Activities;
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namespace WorkflowFanOutFanIn.Workflows;
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public sealed class DemoWorkflow : Workflow<string, string>
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{
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/// <summary>
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/// Override to implement workflow logic.
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/// </summary>
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/// <param name="context">The workflow context.</param>
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/// <param name="input">The deserialized workflow input.</param>
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/// <returns>The output of the workflow as a task.</returns>
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public override async Task<string> RunAsync(WorkflowContext context, string input)
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{
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var tasks = new List<Task>();
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for (var a = 1; a <= 3; a++)
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{
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var task = context.CallActivityAsync(nameof(NotifyActivity), $"calling task {a}");
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tasks.Add(task);
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}
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await Task.WhenAll(tasks);
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return "Workflow completed";
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}
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}

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