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Marc Duiker Lead Azure Consultant @ Xpirit

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions CC BY-SA 3.0 Olga Tarkovskiy

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions Multiple Functions & Control Flow

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions Durable Functions is based on

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Marc Duiker Durable Functions Function Roles

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Marc Duiker Durable Functions Invocations, Checkpoints & Replay

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Marc Duiker Durable Functions Storage Types used by Durable Functions

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Marc Duiker Durable Functions State is Persisted in Table Storage

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Marc Duiker Durable Functions New Trigger Bindings [OrchestrationClient] DurableOrchestrationClient(Base) Function Role: Orchestration Client (Starter Function)

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Marc Duiker Durable Functions DurableOrchestrationClient

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Marc Duiker Durable Functions New Trigger Bindings [OrchestrationTrigger] DurableOrchestrationContext(Base) Function Role: Orchestration Function

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Marc Duiker Durable Functions DurableOrchestrationContext

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Marc Duiker Durable Functions New Trigger Bindings [ActivityTrigger] DurableActivityContext Function Role: Activity Function

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Marc Duiker Durable Functions DurableActivityContext

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions • Visual Studio 2017 15.7+ • Azure Workload - Extension: Azure Functions & Web Jobs Tools - Azure Storage Emulator - Microsoft.Azure.Webjobs.Extensions.DurableTask Local development with VS2017

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Marc Duiker Durable Functions Hello {name} Demo! HttpStart HelloName {name} HelloNameActivity {name}

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions Function chaining

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Marc Duiker Durable Functions Demo: Function Chaining Find a Star Wars character and their home planet. https://swapi.co/

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Marc Duiker Durable Functions Demo: Function Chaining HttpStart GetPlanet GetCharacterInfo SearchCharacter

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions Fan-out/fan-in FA1 returns a collection of items FA2 is called for each of the items from FA1

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Marc Duiker Durable Functions Demo: Fan-out/Fan-in Find a Star Wars planet and their residents. https://swapi.co/

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Marc Duiker Durable Functions Demo: Fan-out/Fan-in HttpStart GetCharacter GetPlanetResidents SearchPlanet

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions Unit Testing Demo Testing the GetPlanetResidents orchestration using: • xUnit • Moq • AutoFixture • FluentAssertions

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Marc Duiker Durable Functions Unit Testing • Use the context base classes. • Use simple or complex (serializable) types with [ActivityTrigger] for the activity input. • Because DurableActivityContext can’t be instantiated/mocked due to internal constructor .

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions • In and output of functions should be serializable. • Orchestration Functions should be deterministic: - DateTime.Now, use CurrentUtcDateTime - Guid.NewGuid() - Random generated data Closing remarks I

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Marc Duiker Durable Functions • Orchestration Functions can only call Activity Functions in the same Function App. • Keep your orchestrations small. • What changes together should be deployed together. Closing remarks II

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Marc Duiker Durable Functions GitHub: demos-azure-durable-functions [email protected] blog.marcduiker.nl @marcduiker