Take your azure functions to the next level with durable functions @ Experts Live 2018
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The document presents an overview of Durable Functions by Marc Duiker, emphasizing their role in serverless applications for orchestrating workflows with improved scalability and reduced maintenance. It covers topics such as local development, function chaining, fan-out/fan-in patterns, and considerations for unit testing using xUnit and Moq. Key concepts include the use of different trigger bindings and orchestration contexts to manage function execution effectively.
![Marc Duiker
Durable Functions
New Trigger Bindings
[OrchestrationClient] DurableOrchestrationClient
Function Role: Orchestration Starter](https://image.slidesharecdn.com/takeyourazurefunctionstothenextlevelwithdurablefunctions-marcduiker-180619114340/85/Take-your-azure-functions-to-the-next-level-with-durable-functions-Experts-Live-2018-19-320.jpg)
![Marc Duiker
Durable Functions
New Trigger Bindings
[OrchestrationTrigger] DurableOrchestrationContext
Function Role: Orchestration Function](https://image.slidesharecdn.com/takeyourazurefunctionstothenextlevelwithdurablefunctions-marcduiker-180619114340/85/Take-your-azure-functions-to-the-next-level-with-durable-functions-Experts-Live-2018-21-320.jpg)
![Marc Duiker
Durable Functions
New Trigger Bindings
[ActivityTrigger] DurableActivityContext
Function Role: Activity Function](https://image.slidesharecdn.com/takeyourazurefunctionstothenextlevelwithdurablefunctions-marcduiker-180619114340/85/Take-your-azure-functions-to-the-next-level-with-durable-functions-Experts-Live-2018-23-320.jpg)
![Marc Duiker
Durable Functions
Unit Testing
• Use DurableOrchestrationContextBase in the orchestration.
• Use serializable types with [ActivityTrigger] for the activity
input. (because DurableActivityContext can’t be
instantiated/mocked due to internal constructor ).](https://image.slidesharecdn.com/takeyourazurefunctionstothenextlevelwithdurablefunctions-marcduiker-180619114340/85/Take-your-azure-functions-to-the-next-level-with-durable-functions-Experts-Live-2018-43-320.jpg)
Take your azure functions to the next level with durable functions @ Experts Live 2018
- 2. Marc Duiker Lead Consultant @ Xpirit
- 3. Marc Duiker Durable Functions • Shift to Serverless • What are orchestrations? • Why do we need them? • What is Durable Functions? • Local development • Demos • Hello World / Hello Name • Function chaining • Fan-out/Fan-in • Unit Testing
- 5. Marc Duiker Durable Functions IaaS PaaS SaaSFaaS + Less maintenance + Pay as you go + More fine grained scalability - Less control - More moving parts
- 9. Marc Duiker Durable Functions Orchestration? Orchestration is the automated arrangement, coordination, and management of computer systems, middleware, and services.
- 17. Marc Duiker Durable Functions Durable Functions is based on
- 18. Marc Duiker Durable Functions Function Roles
- 19. Marc Duiker Durable Functions New Trigger Bindings [OrchestrationClient] DurableOrchestrationClient Function Role: Orchestration Starter
- 21. Marc Duiker Durable Functions New Trigger Bindings [OrchestrationTrigger] DurableOrchestrationContext Function Role: Orchestration Function
- 23. Marc Duiker Durable Functions New Trigger Bindings [ActivityTrigger] DurableActivityContext Function Role: Activity Function
- 25. Marc Duiker Durable Functions Invocations, Checkpoints & Replay Function invocation Execution history
- 26. Marc Duiker Durable Functions Storage Types used by Durable Functions
- 27. Marc Duiker Durable Functions State is Persisted in Table Storage
- 28. Marc Duiker Durable Functions Considerations when using Durable Functions - In and output of functions should be serializable. - Orchestration Functions should be deterministic: - DateTime.Now, use CurrentUtcDateTime - Guid.NewGuid() - Random generated data
- 30. Marc Duiker Durable Functions Visual Studio 2017 15.7+ - “Azure development tools” workload - Extension: Azure Functions & Web Jobs Tools - Azure Storage Emulator - Azure Storage Explorer Local development
- 31. Marc Duiker Durable Functions Hello World Demo! HelloWorld HelloWorldActivityHttpStart
- 32. Marc Duiker Durable Functions Hello {name} Demo! HttpStart HelloName {name} HelloNameActivity {name}
- 34. Marc Duiker Durable Functions Function chaining
- 35. Marc Duiker Durable Functions Demo: Function Chaining Find a Star Wars character and their home planet. https://swapi.co/
- 36. Marc Duiker Durable Functions Demo: Function Chaining HttpStart GetSwCharacterInfo SearchCharacter GetPlanet
- 38. Marc Duiker Durable Functions Fan-out/fan-in FA1 returns a collection of items FA2 is called for each of the items from FA1
- 39. Marc Duiker Durable Functions Demo: Fan-out/Fan-in Find a Star Wars planet and their residents. https://swapi.co/
- 40. Marc Duiker Durable Functions Demo: Fan-out/Fan-in HttpStart GetSwPlanetResidents SearchPlanet GetCharacter
- 42. Marc Duiker Durable Functions Unit Testing Demo Testing the GetSwPlanetAndResidentials orchestration using: • xUnit • Moq • AutoFixture
- 43. Marc Duiker Durable Functions Unit Testing • Use DurableOrchestrationContextBase in the orchestration. • Use serializable types with [ActivityTrigger] for the activity input. (because DurableActivityContext can’t be instantiated/mocked due to internal constructor ).
- 45. Marc Duiker Durable Functions • Orchestration Functions can only call Activity Functions in the same Function App. • Keep your orchestration small. • What changes together should be deployed together. Closing remarks
- 46. Marc Duiker Durable Functions GitHub: demos-azure-durable-functions blog.marcduiker.nl @marcduiker