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![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 / fall back / compensation
}
}](https://image.slidesharecdn.com/durablefunctionsvpublic-190327073740/85/Azure-Durable-Functions-2019-03-30-13-320.jpg)
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![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 / fall back / compensation
}
}](https://image.slidesharecdn.com/durablefunctionsvpublic-190327073740/85/Azure-Durable-Functions-2019-03-30-14-320.jpg)
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![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 / fall back / compensation
}
}](https://image.slidesharecdn.com/durablefunctionsvpublic-190327073740/85/Azure-Durable-Functions-2019-03-30-15-320.jpg)
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![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/durablefunctionsvpublic-190327073740/85/Azure-Durable-Functions-2019-03-30-16-320.jpg)
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![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;
}
CallActivityWithRetryAsync](https://image.slidesharecdn.com/durablefunctionsvpublic-190327073740/85/Azure-Durable-Functions-2019-03-30-17-320.jpg)
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![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($"Started orchestration with ID = '{instanceId}'.");
var res = starter.CreateCheckStatusResponse(req, instanceId);
return res;
}](https://image.slidesharecdn.com/durablefunctionsvpublic-190327073740/85/Azure-Durable-Functions-2019-03-30-18-320.jpg)
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![Orchestration Client
public static async Task<HttpResponseMessage> Run(
[HttpTrigger(AuthorizationLevel.Function, methods: "post",
Route = "orchestrators/{functionName}")] HttpRequestMessage req,
[OrchestrationClient] DurableOrchestrationClientBase starter, ILogger log)
{
// Function input comes from the request content.
dynamic eventData = await req.Content.ReadAsAsync<object>();
string instanceId = await starter.StartNewAsync("myOrchestrator", eventData);
log.LogInformation($"Started orchestration with ID = '{instanceId}'.");
var res = starter.CreateCheckStatusResponse(req, instanceId);
return res;
}](https://image.slidesharecdn.com/durablefunctionsvpublic-190327073740/85/Azure-Durable-Functions-2019-03-30-19-320.jpg)
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![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/durablefunctionsvpublic-190327073740/85/Azure-Durable-Functions-2019-03-30-20-320.jpg)
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Uploaded byPaco de la Cruz
Azure Durable Functions (2019-03-30)
This document summarizes Paco de la Cruz's presentation on Azure Durable Functions. The presentation covered the evolution of application platforms from on-premises to serverless. It then discussed Azure Functions and some challenges it faces with stateful orchestrations. Durable Functions were introduced as an extension of Azure Functions that uses a Durable Task Framework to implement stateful workflows in a serverless manner. Key patterns demonstrated include function chaining, fan-out/fan-in, and using an orchestration client to start and monitor orchestrations. Code samples and demos were provided to illustrate approval workflows using Durable Functions.
![Vert.x - Reactive & Distributed [Devoxx version]](https://cdn.slidesharecdn.com/ss_thumbnails/devoxxvertx-reactivedistributed-181211094022-thumbnail.jpg?width=640&height=640&fit=bounds)
