DurableTask.Symphony 1.2.2

DurableTask.Symphony

This repo contains the library code to interact with Durable Task Framework (DTFx) using MS SQL as the Orchestration Hub backend.

About

It contains wrappers, services, extensions, and other helper methods to configure and use TaskHubClient and TaskHubWorker as injectable services, as well as reading state information from the configured OrchestrationServiceBase, which configured to use SQL server as a task hub.

Usage

Database configuration

Run Create-DurableTables.sql in the config/ directory of this repo. This will create the required tables and stored procedures for the Orchestration Hub.

Task Worker configuration

In the IHost ConfigureServices() configuration methods, use the extension methods to configure the Orchestration Hub and the Task Worker.

IHost.CreateDefaultBuilder(args)
	 .ConfigureServices((hostBuilderContext, services) =>
	 {
		services.AddOrchestrationHub(options =>
			{
				// Adds the backing SQL connection for storage and persistence
				options.ConnectionString = "DurableContextSQLConnectionString"
				options.MaxActiveOrchestrations = 10;
			})
			.AddTaskWorker(options => 
			{
				// Adds the Task Worker hosted services
				options.ErrorPropagationMode = ErrorPropagationMode.UseFailureDetails);
			})
			.WithRegisteredOrchestrations(new[]
			{
				// Adds Orchestrations as transient services and registers them with the Task Worker
				typeof(SampleOrchestration),
				typeof(AnotherOrchestration)
			})
			.WithRegisteredActivities(new[]
			{
				// Adds Activities and transient services and registers them with the Task Worker
				typeof(SampleActivity),
				typeof(AnotherActivity)
			});
	 })
	 .Build();

Orchestrations must be classes that implement TaskOrchestration<TOutput, TInput>. Activities must be classes that implement TaskActivity<TInput, TOutput> or AsyncTaskActivity<TInput, TOutput>. Orchestrations and Activities must be registered on the task worker (server) to function.

Task Client configuration

In the IHost ConfigureServices() configuration methods, use the extension methods to configure the connection to the Orchestration Hub.

IHost.CreateDefaultBuilder(args)
	 .ConfigureServices((hostBuilderContext, services) =>
	 {
		services.AddOrchestrationHub(options =>
			{
				// Adds the backing SQL connection for storage and persistence
				options.ConnectionString = "DurableContextSQLConnectionString"
			})
			.AddTaskClient();
	 })
	 .Build();

To start an Orchestration, inject an instance of the ITaskClient service and use the StartOrchestration or ScheduleOrchestration methods.

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