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Added workflow example demonstrating external interaction
Signed-off-by: Whit Waldo <whit.waldo@innovian.net>
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20 changes: 20 additions & 0 deletions
20
examples/Workflow/WorkflowExternalInteraction/Activities/ApproveActivity.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,20 @@ | ||
| using Dapr.Workflow; | ||
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| namespace WorkflowExternalInteraction.Activities; | ||
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| internal sealed class ApproveActivity : WorkflowActivity<string, bool> | ||
| { | ||
| /// <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 async Task<bool> RunAsync(WorkflowActivityContext context, string input) | ||
| { | ||
| Console.WriteLine($"Workflow {input} is approved"); | ||
| Console.WriteLine("Running Approval activity..."); | ||
| await Task.Delay(TimeSpan.FromSeconds(5)); | ||
| return true; | ||
| } | ||
| } |
20 changes: 20 additions & 0 deletions
20
examples/Workflow/WorkflowExternalInteraction/Activities/RejectActivity.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,20 @@ | ||
| using Dapr.Workflow; | ||
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| namespace WorkflowExternalInteraction.Activities; | ||
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| internal sealed class RejectActivity : WorkflowActivity<string, bool> | ||
| { | ||
| /// <summary> | ||
| /// Override to implement async (non-blocking) workflow activity logic. | ||
| /// </summary> | ||
| /// <param name="context">Provides access to additional context for the current activity execution.</param> | ||
| /// <param name="input">The deserialized activity input.</param> | ||
| /// <returns>The output of the activity as a task.</returns> | ||
| public override async Task<bool> RunAsync(WorkflowActivityContext context, string input) | ||
| { | ||
| Console.WriteLine($"Workflow {input} is rejected"); | ||
| Console.WriteLine("Running Reject activity..."); | ||
| await Task.Delay(TimeSpan.FromSeconds(5)); | ||
| return true; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| using Dapr.Workflow; | ||
| using Microsoft.Extensions.DependencyInjection; | ||
| using Microsoft.Extensions.Hosting; | ||
| using WorkflowExternalInteraction.Activities; | ||
| using WorkflowExternalInteraction.Workflows; | ||
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| var builder = Host.CreateDefaultBuilder(args).ConfigureServices(services => | ||
| { | ||
| services.AddDaprWorkflow(options => | ||
| { | ||
| options.RegisterWorkflow<DemoWorkflow>(); | ||
| options.RegisterActivity<ApproveActivity>(); | ||
| options.RegisterActivity<RejectActivity>(); | ||
| }); | ||
| }); | ||
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| 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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| var instanceId = $"demo-workflow-{Guid.NewGuid().ToString()[..8]}"; | ||
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| await daprWorkflowClient.ScheduleNewWorkflowAsync(nameof(DemoWorkflow), instanceId, instanceId); | ||
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| bool enterPressed = false; | ||
| Console.WriteLine("Press [ENTER] within the next 10 seconds to approve this workflow"); | ||
| using (var cts = new CancellationTokenSource()) | ||
| { | ||
| var inputTask = Task.Run(() => | ||
| { | ||
| if (Console.ReadKey().Key == ConsoleKey.Enter) | ||
| { | ||
| Console.WriteLine("Approved"); | ||
| enterPressed = true; | ||
| cts.Cancel(); //Cancel the delay task if Enter is pressed | ||
| } | ||
| }); | ||
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| try | ||
| { | ||
| await Task.Delay(TimeSpan.FromSeconds(10), cts.Token); | ||
| } | ||
| catch (TaskCanceledException) | ||
| { | ||
| // Task was cancelled because Enter was pressed | ||
| } | ||
| } | ||
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| if (enterPressed) | ||
| { | ||
| await daprWorkflowClient.RaiseEventAsync(instanceId, "Approval", true); | ||
| } | ||
| else | ||
| { | ||
| Console.WriteLine("Rejected"); | ||
| } | ||
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| await daprWorkflowClient.WaitForWorkflowCompletionAsync(instanceId); | ||
| var state = await daprWorkflowClient.GetWorkflowStateAsync(instanceId); | ||
| Console.WriteLine($"Workflow state: {state.RuntimeStatus}"); |
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18
examples/Workflow/WorkflowExternalInteraction/WorkflowExternalInteraction.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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33
examples/Workflow/WorkflowExternalInteraction/Workflows/DemoWorkflow.cs
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,33 @@ | ||
| using Dapr.Workflow; | ||
| using WorkflowExternalInteraction.Activities; | ||
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| namespace WorkflowExternalInteraction.Workflows; | ||
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| internal sealed class DemoWorkflow : Workflow<string, bool> | ||
| { | ||
| /// <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<bool> RunAsync(WorkflowContext context, string input) | ||
| { | ||
| try | ||
| { | ||
| await context.WaitForExternalEventAsync<bool>(eventName: "Approval", timeout: TimeSpan.FromSeconds(10)); | ||
| } | ||
| catch (TaskCanceledException) | ||
| { | ||
| Console.WriteLine("Approval timeout"); | ||
| await context.CallActivityAsync(nameof(RejectActivity), input); | ||
| Console.WriteLine("Reject Activity finished"); | ||
| return false; | ||
| } | ||
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| await context.CallActivityAsync(nameof(ApproveActivity), input); | ||
| Console.WriteLine("Approve Activity finished"); | ||
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| return true; | ||
| } | ||
| } |