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STREAMLINEYOUR BUSINESS WORKFLOW WITH
AZURE DURABLE FUNCTIONS
BY: SAMMANI PALANSURIYA EKANAYAKE
SENIOR TECHNICAL LEAD – 99X TECHNOLOGY
What we will discuss
Limitation
Durable
Functions
Architectu
re
Demo
• Scenarios where azure
functions fails
• What is durable functions?
• Components
• How it manages state
• Function Chaining
• Fan In Fan Out
• Exception Handling
1 LimitationsLimitations
SOLVING FAN IN FAN OUT PATTERN
EXCEPTION HANDLING IN FUNCTION CHAIN
Write Order Details Call External Service to
update inventory
Send email to customer
2 Durable FunctionsDurable Functions
AZURE DURABLE FUNCTIONS
Durable Functions are an extension of Azure
Functions that lets you write stateful functions in a
serverless environment.The extension manages
state, checkpoints, and restarts for you.
MAIN COMPONENTS
Starter
Orchestrato
r
Activity
• Any Trigger Function which
will start the workflow
• Define the workflow
• Triggers “activity” functions
• Sleeps during activities
• Performs a single step in a
workflow
• Can receive and return data
D
e
m
o
Function ChainingFunction Chaining
3 ArchitectureArchitecture
MANAGING STATE
Storage Account
 Storage Queue – Storage queue is used as the
communication mechanism to trigger the next
function
 Storage Table – Store the state of the orchestrator
function
Event Sourcing
TASK HUB
ADVANTAGES
 It allow to Define workflow in code
 Error handling is possible at any point
 State management is fully handled so you don’t need to worry about it
D
e
m
o
Fan In Fan OutFan In Fan Out
FURTHER READING
 What are the other usage patterns
 Orchestrator Constraints
 https://sammanipalansuriya.blogspot.com/search/label/Azure%20Durable%20Functions
 https://code.msdn.microsoft.com/Azure-Durable-Functions-9099c85f
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Streamline business worksflows with azure durable functios