DurableTask-Hosting

Hosting:

Dependency Injection:

A Microsoft.Extensions.Hosting wrapper around the azure/durabletask framework.

Getting Started

See Samples for a quick start example.

1. Add nuget package: dotnet add package Vio.DurableTask.Hosting
2. Add to your host builder:

await Host.CreateDefaultBuilder()
    .ConfigureServices(services =>
    {
        // Can configure orchestrations, activities, and middleware in the service
        // container with any scope desired.
        services.AddSingleton<MySingletonOrchestration>();
        services.AddScoped<MyScopedMiddleware>(); // must implement "ITaskMiddleware"
    })
    .ConfigureTaskHubWorker((context, builder) =>
    {
        // add orchestration service
        builder.WithOrchestrationService(new LocalOrchestrationService());

        // add orchestration directly _not_ in service container. Will be treated as transient.
        builder.AddOrchestration<MyTransientOrchestration>();

        // will be fetched from service provider.
        builder.AddOrchestration<MySingletonOrchestration>();

        // will be fetched from service provider.
        builder.UseOrchestrationMiddleware<MyScopedMiddleware>();

        // same as orchestration: can be part of the services or not.
        builder.AddActivity<MyTransientActivity>();
    })
    .RunConsoleAsync(); // starts the worker.

All orchestrations, activities, and middleware will now be constructed via dependency injection.

Service Scope

A new IServiceScope is created for the duration of every OrchestrationInstance run. This scope will be used for all actions, middleware, and the orchestration itself and disposed after both the middleware & orchestration pipeline has finished execution. Scopes are not preserved between runs of the same OrchestrationInstance.