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Added workflow sample: Task chaining (#1387)
* Added Workflow Task Chaining example to replace #1206 Signed-off-by: Whit Waldo <[email protected]> * Targeting .NET 6, fixed transposition error Signed-off-by: Whit Waldo <[email protected]> * Added missing copyright headers Signed-off-by: Whit Waldo <[email protected]> --------- Signed-off-by: Whit Waldo <[email protected]>
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31 changes: 31 additions & 0 deletions
31
examples/Workflow/WorkflowTaskChaining/Activities/Step1.cs
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| // ------------------------------------------------------------------------ | ||
| // 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. | ||
| // ------------------------------------------------------------------------ | ||
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| using Dapr.Workflow; | ||
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| namespace WorkflowTaskChaining.Activities; | ||
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| internal sealed class Step1 : WorkflowActivity<int, int> | ||
| { | ||
| /// <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<int> RunAsync(WorkflowActivityContext context, int input) | ||
| { | ||
| Console.WriteLine($@"Step 1: Received input: {input}."); | ||
| return Task.FromResult(input + 1); | ||
| } | ||
| } |
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31
examples/Workflow/WorkflowTaskChaining/Activities/Step2.cs
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| // ------------------------------------------------------------------------ | ||
| // Copyright 2024 The Dapr Authors | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // ------------------------------------------------------------------------ | ||
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| using Dapr.Workflow; | ||
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| namespace WorkflowTaskChaining.Activities; | ||
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| internal sealed class Step2 : WorkflowActivity<int, int> | ||
| { | ||
| /// <summary> | ||
| /// Override to implement async (non-blocking) workflow activity logic. | ||
| /// </summary> | ||
| /// <param name="context">Provides access to additional context for the current activity execution.</param> | ||
| /// <param name="input">The deserialized activity input.</param> | ||
| /// <returns>The output of the activity as a task.</returns> | ||
| public override Task<int> RunAsync(WorkflowActivityContext context, int input) | ||
| { | ||
| Console.WriteLine($@"Step 2: Received input: {input}."); | ||
| return Task.FromResult(input + 2); | ||
| } | ||
| } |
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31
examples/Workflow/WorkflowTaskChaining/Activities/Step3.cs
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| // ------------------------------------------------------------------------ | ||
| // 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. | ||
| // ------------------------------------------------------------------------ | ||
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| using Dapr.Workflow; | ||
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| namespace WorkflowTaskChaining.Activities; | ||
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| internal sealed class Step3 : WorkflowActivity<int, int> | ||
| { | ||
| /// <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<int> RunAsync(WorkflowActivityContext context, int input) | ||
| { | ||
| Console.WriteLine($@"Step 3: Received input: {input}."); | ||
| return Task.FromResult(input ^ 2); | ||
| } | ||
| } |
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| // ------------------------------------------------------------------------ | ||
| // 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. | ||
| // ------------------------------------------------------------------------ | ||
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| using Dapr.Workflow; | ||
| using Microsoft.Extensions.DependencyInjection; | ||
| using Microsoft.Extensions.Hosting; | ||
| using WorkflowTaskChaining.Activities; | ||
| using WorkflowTaskChaining.Workflows; | ||
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| var builder = Host.CreateDefaultBuilder(args).ConfigureServices(services => | ||
| { | ||
| services.AddDaprWorkflow(options => | ||
| { | ||
| options.RegisterWorkflow<DemoWorkflow>(); | ||
| options.RegisterActivity<Step1>(); | ||
| options.RegisterActivity<Step2>(); | ||
| options.RegisterActivity<Step3>(); | ||
| }); | ||
| }); | ||
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| // Start the app - this is the point where we connect to the Dapr sidecar to listen | ||
| // for workflow work-items to execute | ||
| using var host = builder.Build(); | ||
| await host.StartAsync(); | ||
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| await using var scope = host.Services.CreateAsyncScope(); | ||
| var daprWorkflowClient = scope.ServiceProvider.GetRequiredService<DaprWorkflowClient>(); | ||
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| //Check health | ||
| const int wfInput = 42; | ||
| Console.WriteLine(@"Workflow Started"); | ||
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| var instanceId = $"demo-workflow-{Guid.NewGuid().ToString()[..8]}"; | ||
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| //Start the workflow immediately | ||
| await daprWorkflowClient.ScheduleNewWorkflowAsync(nameof(DemoWorkflow), instanceId, wfInput); | ||
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| //Get the status of the workflow | ||
| WorkflowState workflowState; | ||
| while (true) | ||
| { | ||
| workflowState = await daprWorkflowClient.GetWorkflowStateAsync(instanceId, true); | ||
| Console.WriteLine($@"Workflow status: {workflowState.RuntimeStatus}"); | ||
| if (workflowState.IsWorkflowCompleted) | ||
| break; | ||
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| await Task.Delay(TimeSpan.FromSeconds(1)); | ||
| } | ||
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| //Display the result from the workflow | ||
| var result = string.Join(" ", workflowState.ReadOutputAs<int[]>() ?? Array.Empty<int>()); | ||
| Console.WriteLine($@"Workflow result: {result}"); | ||
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examples/Workflow/WorkflowTaskChaining/WorkflowTaskChaining.csproj
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| <Project Sdk="Microsoft.NET.Sdk"> | ||
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| <PropertyGroup> | ||
| <OutputType>Exe</OutputType> | ||
| <TargetFramework>net6.0</TargetFramework> | ||
| <ImplicitUsings>enable</ImplicitUsings> | ||
| <Nullable>enable</Nullable> | ||
| </PropertyGroup> | ||
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| <ItemGroup> | ||
| <ProjectReference Include="..\..\..\src\Dapr.Workflow\Dapr.Workflow.csproj" /> | ||
| </ItemGroup> | ||
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| <ItemGroup> | ||
| <PackageReference Include="Microsoft.Extensions.Hosting" /> | ||
| </ItemGroup> | ||
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| </Project> |
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examples/Workflow/WorkflowTaskChaining/Workflows/DemoWorkflow.cs
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| // ------------------------------------------------------------------------ | ||
| // 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. | ||
| // ------------------------------------------------------------------------ | ||
|
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| using Dapr.Workflow; | ||
| using WorkflowTaskChaining.Activities; | ||
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| namespace WorkflowTaskChaining.Workflows; | ||
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| internal sealed class DemoWorkflow : Workflow<int, int[]> | ||
| { | ||
| /// <summary> | ||
| /// Override to implement workflow logic. | ||
| /// </summary> | ||
| /// <param name="context">The workflow context.</param> | ||
| /// <param name="input">The deserialized workflow input.</param> | ||
| /// <returns>The output of the workflow as a task.</returns> | ||
| public override async Task<int[]> RunAsync(WorkflowContext context, int input) | ||
| { | ||
| var result1 = await context.CallActivityAsync<int>(nameof(Step1), input); | ||
| var result2 = await context.CallActivityAsync<int>(nameof(Step2), result1); | ||
| var result3 = await context.CallActivityAsync<int>(nameof(Step3), result2); | ||
| var ret = new int[] { result1, result2, result3 }; | ||
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| return ret; | ||
| } | ||
| } |
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