Durable Functions orchestration patterns in Azure - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start a Durable Functions orchestration.

Azure

const client = df.getClient(context); const instanceId = await client.startNew('[1]', undefined, input);

Drag options to blanks, or click blank then click option'

AhttpStart

BactivityFunction

CtriggerFunction

DorchestratorFunction

Attempts:

3 left

💡 Hint

Common Mistakes

Using the activity function name instead of the orchestrator function name.

Using the HTTP trigger function name here.

The orchestration is started by calling startNew with the name of the orchestrator function.

2fill in blank

medium

Complete the code to call an activity function from an orchestrator.

Azure

const result = yield context.df.callActivity('[1]', input);

Drag options to blanks, or click blank then click option'

AorchestratorFunction

BactivityFunction

ChttpStart

DtimerFunction

Attempts:

3 left

💡 Hint

Common Mistakes

Using the orchestrator function name instead of the activity function name.

Using the HTTP trigger function name.

Inside an orchestrator, you call activity functions by their name using callActivity.

3fill in blank

hard

Fix the error in the orchestration code to wait for multiple activities to complete.

Azure

const tasks = [context.df.callActivity('A', inputA), context.df.callActivity('B', inputB)]; const results = yield [1](tasks);

Drag options to blanks, or click blank then click option'

Acontext.df.Task.whenAll

Bcontext.df.Task.all

Ccontext.df.Task.waitAll

Dcontext.df.Task.waitAny

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-existent method like Task.all or Task.waitAll.

Using Task.waitAny which waits for any one task.

To wait for all tasks to complete, use context.df.Task.whenAll.

4fill in blank

hard

Fill both blanks to create a durable timer that waits for 5 minutes.

Azure

const expiration = context.df.currentUtcDateTime.addMinutes([1]); yield context.df.createTimer([2]);

Drag options to blanks, or click blank then click option'

A5

B10

Cexpiration

Dcontext.df.currentUtcDateTime

Attempts:

3 left

💡 Hint

Common Mistakes

Using 10 minutes instead of 5.

Passing the current time instead of the expiration time to createTimer.

You add 5 minutes to the current time, then create a timer that waits until that expiration time.

5fill in blank

hard

Fill all three blanks to implement a fan-out/fan-in pattern that calls three activities and collects results.

Azure

const tasks = [context.df.callActivity([1], input1), context.df.callActivity([2], input2), context.df.callActivity([3], input3)]; const results = yield context.df.Task.whenAll(tasks);

Drag options to blanks, or click blank then click option'

A'activityOne'

B'activityTwo'

C'activityThree'

D'orchestratorFunction'

Attempts:

3 left

💡 Hint

Common Mistakes

Using the orchestrator function name instead of activity names.

Missing quotes around activity names.

Each activity function is called by its name as a string. The orchestrator function is not called here.