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![Azure Nights Melbourne
Function Chaining Pattern
public static async Task<object> Run(
[OrchestrationTrigger] DurableOrchestrationContext ctx)
{
try
{
var x = await ctx.CallActivityAsync<object>("F1");
var y = await ctx.CallActivityAsync<object>("F2", x);
return await ctx.CallActivityAsync<object>("F3", y);
}
catch (Exception ex)
{
// error handling / compensation
}
}](https://image.slidesharecdn.com/durablefunctionspublic-180613054852/75/Azure-Durable-Functions-2018-06-13-11-2048.jpg)
![Azure Nights Melbourne
Fan-out & Fan-In Pattern
public static async Task<int> Run(
[OrchestrationTrigger] DurableOrchestrationContext ctx)
{
object[] workBatch = await ctx.CallActivityAsync<object[]>("F1");
var tasks = new Task<long>[workBatch.Length];
for (int i = 0; i < workBatch.Length; i++)
{
tasks[i] = ctx.CallActivityAsync<int>("F2", workBatch[i]);
}
await Task.WhenAll(tasks);
long sum = tasks.Sum(t => t.Result);
return sum;
}](https://image.slidesharecdn.com/durablefunctionspublic-180613054852/75/Azure-Durable-Functions-2018-06-13-12-2048.jpg)
![Azure Nights Melbourne
Orchestration Client
public static async Task<HttpResponseMessage> Run(
[HttpTrigger(AuthorizationLevel.Function, methods: "post",
Route = "orchestrators/{functionName}")] HttpRequestMessage req,
[OrchestrationClient] DurableOrchestrationClientBase starter, ILogger log)
{
// Function input comes from the request content.
dynamic eventData = await req.Content.ReadAsAsync<object>();
string instanceId = await starter.StartNewAsync("myOrchestrator", eventData);
log.LogInformation($"Started orchestration with ID = '{instanceId}'.");
var res = starter.CreateCheckStatusResponse(req, instanceId);
return res;
}](https://image.slidesharecdn.com/durablefunctionspublic-180613054852/75/Azure-Durable-Functions-2018-06-13-13-2048.jpg)
![Azure Nights Melbourne
Durable Functions vs Logic Apps?
vs
Durable Functions Logic Apps
Both allow implementing advanced workflow patterns
C#, F# and JavaScript in preview Visual designer and WDL
Bindings (~ 20 supported) 200+ connectors
Portable Runtime Run only on Azure
Monitoring based on App Insights & APIs Rich monitoring & management tools
Serverless, dedicated and isolated Serverless only
(dedicated in the future [ISE])
blog.mexia.com.au/azure-durable-functions-vs-logic-apps](https://image.slidesharecdn.com/durablefunctionspublic-180613054852/75/Azure-Durable-Functions-2018-06-13-14-2048.jpg)
Uploaded byPaco de la Cruz
Azure Durable Functions (2018-06-13)
The document discusses Azure Nights Melbourne's presentation on Durable Functions, focusing on serverless and stateful orchestrations in Azure. Key points include function patterns such as function chaining and fanning-out, as well as challenges like error handling and long-running processes. It also compares Durable Functions with Logic Apps, highlighting their respective benefits and use cases.
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Azure Durable Functions (2018-06-13)
- 1. Azure Nights Melbourne Pacode la Cruz Durable Functions Serverless and Stateful Orchestrations on Azure Azure Nights Melbourne
- 2.
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- 4. Azure Nights Melbourne Evolutionof Application Platforms On-premises IaaS PaaS Serverless
- 5. Azure Nights Melbourne “Serverless”and its benefits Event-driven scaling not resource-driven Pay only for what you use Server abstraction Focus on value
- 6. Azure Nights Melbourne AzureFunctions in a nutshell Event Triggers Code Outputs React and get inputs from a growing list of services (triggers and input bindings) C#, F#, node.js, Java, Phyton Send results to a growing list of services (output bindings)
- 7. Azure Nights Melbourne Somechallenges of Azure Functions Manageable Sequencing + Error Handling / Compensation Fanning-out & Fanning-in Http-based Async Long-running APIs Human InteractionFlexible Automated Long-running Process Monitoring External Events Correlation Start Get Status
- 8. Azure Nights Melbourne DurableFunction Patterns 1: Function Chaining 2: Fanning-out & Fanning-in 3: Async HTTP APIs 5: Human Interaction4: Monitoring ?: External Events Correlation Start Get Status
- 9. Azure Nights Melbourne DurableFunctions in a nutshell Based on Durable Task Framework Using Azure Storage (Fully Managed and Abstracted) To Implement stateful workflows-as-code (C#, F# and Node.js in preview) Azure Functions Extension
- 10. Azure Nights Melbourne DurableFunctions Components Activity Function Activity Function Activity Function Orchestrator Function Orchestration Client Start Get Status Send Event Wait for Completion Terminate Stateless Single Step Inputs and Outputs Stateful Process Manager Call Activity Functions Error Handling and Compensation Checkpointing Dehydrates during activities Rehydrates at responses / events
- 11. Azure Nights Melbourne FunctionChaining Pattern public static async Task<object> Run( [OrchestrationTrigger] DurableOrchestrationContext ctx) { try { var x = await ctx.CallActivityAsync<object>("F1"); var y = await ctx.CallActivityAsync<object>("F2", x); return await ctx.CallActivityAsync<object>("F3", y); } catch (Exception ex) { // error handling / compensation } }
- 12. Azure Nights Melbourne Fan-out& Fan-In Pattern public static async Task<int> Run( [OrchestrationTrigger] DurableOrchestrationContext ctx) { object[] workBatch = await ctx.CallActivityAsync<object[]>("F1"); var tasks = new Task<long>[workBatch.Length]; for (int i = 0; i < workBatch.Length; i++) { tasks[i] = ctx.CallActivityAsync<int>("F2", workBatch[i]); } await Task.WhenAll(tasks); long sum = tasks.Sum(t => t.Result); return sum; }
- 13. Azure Nights Melbourne OrchestrationClient public static async Task<HttpResponseMessage> Run( [HttpTrigger(AuthorizationLevel.Function, methods: "post", Route = "orchestrators/{functionName}")] HttpRequestMessage req, [OrchestrationClient] DurableOrchestrationClientBase starter, ILogger log) { // Function input comes from the request content. dynamic eventData = await req.Content.ReadAsAsync<object>(); string instanceId = await starter.StartNewAsync("myOrchestrator", eventData); log.LogInformation($"Started orchestration with ID = '{instanceId}'."); var res = starter.CreateCheckStatusResponse(req, instanceId); return res; }
- 14. Azure Nights Melbourne DurableFunctions vs Logic Apps? vs Durable Functions Logic Apps Both allow implementing advanced workflow patterns C#, F# and JavaScript in preview Visual designer and WDL Bindings (~ 20 supported) 200+ connectors Portable Runtime Run only on Azure Monitoring based on App Insights & APIs Rich monitoring & management tools Serverless, dedicated and isolated Serverless only (dedicated in the future [ISE]) blog.mexia.com.au/azure-durable-functions-vs-logic-apps
- 15. Azure Nights Melbourne AdditionalResources Twitter @azurefunctions Documentation aka.ms/durablefunctions Live Web Cast aka.ms/azurefunctionslive Repos github.com/Azure/azure-functions-durable-extension github.com/Azure/azure-functions-durable-js Samples github.com/Azure/azure-functions-durable- extension/tree/master/samples Pluralsight course app.pluralsight.com/library/courses/ azure-durable-functions-fundamentals
- 16. Azure Nights Melbourne Anyquestions so far?
- 17. Azure Nights Melbourne Demo1 Development and Debugging Furry Models Cat Application Approval github.com/pacodelacruz/ DurableFunctions-AzureNights
- 18. Azure Nights Melbourne Orchestration Function Start SendApproval Request via Email Create Timer External Event Timer Expires WhenAny Move Blob to Corresponding Container End (Requests blob container) (Approved or Rejected blob container)
- 19. Azure Nights Melbourne Orchestration Function Start SendApproval Request via Email Create Timer External Event Timer Expires WhenAny Move Blob to Corresponding Container End BlobTrigger Function HttpTrigger Process Approval (Requests blob container) (Approved or Rejected blob container) Orchestration Client Activity Functions ActivityTrigger Send Approval Request via Email ActivityTrigger Move Blob to Corresponding Container HttpTrigger Check Status
- 20. Azure Nights Melbourne Demo2 Execution & Monitoring on Azure github.com/pacodelacruz/ DurableFunctions-AzureNights
- 21. Azure Nights Melbourne Orchestration Function Start SendApproval Request via Slack Create Timer External Event Timer Expires WhenAny Move Blob to Corresponding Container End BlobTrigger Function HttpTrigger Process Approval (Requests blob container) (Approved or Rejected blob container) Orchestration Client Activity Functions ActivityTrigger Send Approval Request via Slack ActivityTrigger Move Blob to Corresponding Container HttpTrigger Check Status
- 22. Azure Nights Melbourne Letyour Cat apply! Great opportunity to get famous! Send an email to: … Subject: I want to be a Furry Model! Attach your cat best picture
- 23. Azure Nights Melbourne Detailsabout the demos: blog.mexia.com.au/azure-durable-functions-approval-workflow-with-sendgrid blog.mexia.com.au/azure-durable-functions-approval-workflow-with-slack github.com/pacodelacruz/ DurableFunctions-AzureNights
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