README.md

Sub-Orchestrations — Durable Task SDK (.NET)

.NET | Durable Task SDK

Description

Demonstrates sub-orchestrations using the Durable Task SDK. A parent orchestration processes an order by delegating each line item to a child orchestration, which handles validation, pricing, and inventory reservation independently.

This pattern is useful for:

• Breaking complex workflows into smaller, reusable pieces
• Processing collections where each item has multi-step logic
• Isolating failure domains within a larger workflow

Prerequisites

1. .NET 8 SDK
2. Docker (for the emulator)

Quick Run

1. Start the Durable Task Scheduler emulator:

   docker run -d -p 8080:8080 -p 8082:8082 mcr.microsoft.com/dts/dts-emulator:latest

2. Start the worker (in one terminal):

   cd Worker
   dotnet run

3. Start the client (in another terminal):

   cd Client
   dotnet run

4. View the orchestration hierarchy in the dashboard: http://localhost:8082

How It Works

1. The parent orchestration receives an order with multiple line items
2. For each line item, it calls a child orchestration as a sub-orchestration
3. Each child orchestration runs independently: validates the item, calculates the price, and reserves inventory
4. The parent collects all results and returns the complete order summary
5. If any child fails, the parent can handle the error gracefully

Learn More

• Sub-orchestrations
• Durable Task Scheduler Documentation