.NET: [Feature Branch] Add basic durable workflow support (#3648)

* Add basic durable workflow support. * PR feedback fixes * Add conditional edge sample. * PR feedback fixes. * Minor cleanup. * Minor cleanup * Minor formatting improvements. * Improve comments/documentation on the execution flow.
2026-06-16 21:04:09 +08:00 · 2026-02-06 16:02:42 -08:00
parent 98cd72839e
commit e8d0bd9051
54 changed files with 4863 additions and 505 deletions
@@ -0,0 +1,61 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using Microsoft.Agents.AI.Workflows;
+using Microsoft.DurableTask;
+using Microsoft.DurableTask.Client;
+
+namespace Microsoft.Agents.AI.DurableTask.Workflows;
+
+/// <summary>
+/// Provides a durable task-based implementation of <see cref="IWorkflowClient"/> for running
+/// workflows as durable orchestrations.
+/// </summary>
+internal sealed class DurableWorkflowClient : IWorkflowClient
+{
+    private readonly DurableTaskClient _client;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="DurableWorkflowClient"/> class.
+    /// </summary>
+    /// <param name="client">The durable task client for orchestration operations.</param>
+    /// <exception cref="ArgumentNullException">Thrown when <paramref name="client"/> is null.</exception>
+    public DurableWorkflowClient(DurableTaskClient client)
+    {
+        ArgumentNullException.ThrowIfNull(client);
+        this._client = client;
+    }
+
+    /// <inheritdoc/>
+    public async ValueTask<IWorkflowRun> RunAsync<TInput>(
+        Workflow workflow,
+        TInput input,
+        string? runId = null,
+        CancellationToken cancellationToken = default)
+        where TInput : notnull
+    {
+        ArgumentNullException.ThrowIfNull(workflow);
+
+        if (string.IsNullOrEmpty(workflow.Name))
+        {
+            throw new ArgumentException("Workflow must have a valid Name property.", nameof(workflow));
+        }
+
+        DurableWorkflowInput<TInput> workflowInput = new() { Input = input };
+
+        string instanceId = await this._client.ScheduleNewOrchestrationInstanceAsync(
+            orchestratorName: WorkflowNamingHelper.ToOrchestrationFunctionName(workflow.Name),
+            input: workflowInput,
+            options: runId is not null ? new StartOrchestrationOptions(runId) : null,
+            cancellation: cancellationToken).ConfigureAwait(false);
+
+        return new DurableWorkflowRun(this._client, instanceId, workflow.Name);
+    }
+
+    /// <inheritdoc/>
+    public ValueTask<IWorkflowRun> RunAsync(
+        Workflow workflow,
+        string input,
+        string? runId = null,
+        CancellationToken cancellationToken = default)
+        => this.RunAsync<string>(workflow, input, runId, cancellationToken);
+}