From Music City Code 2017 - A brief tour of Azure Logic Apps functionality and integration with Azure ecosystem services.

1. Azure Logic Apps
Josh Lane
Azure Content Lead – Cloud Academy
Ian Philpot
Senior Developer Evangelist – Microsoft

3. What the
what?
• Integration PaaS
• Declarative, trigger-based
workflows
• Hosted in Azure
• JSON-based
• Pay per workflow step executed
• Starts at $0.0008/step

5. Logic Apps
 Connect Anything
 Agile Business
 Transform Business

6. Cloud APIs and
platform functionality
API connections
Managed
connectors

7. Protocols/Native
XML & EDI
Hybrid
Spectrum of
connectors
SaaS

8. Protocols/Native
XML & EDI
Hybrid
Spectrum of
connectors
SaaS
• Azure API Management
• Azure App Services
• Azure Cognitive Face API
• Azure Cognitive LUIS
• Azure Cognitive Text Analytics
• Azure Document DB
• Azure Functions
• Azure Machine Learning
• Azure Resource Manager
• Azure Service Bus
• Azure SQL
• Azure Storage Blob
• Azure Storage Queues

9. Protocols/Native
XML & EDI
Hybrid
• BizTalk Server
• SharePoint Server
• SQL Server
Spectrum of
connectors
SaaS
• Bing Search
• Dynamics AX Online
• Dynamics CRM Online
• Dynamics CRM Service Bus
• Dynamics Financials
• Dynamics Operations
• Microsoft Project Online
• Microsoft Translator
• MSN Weather
• Office 365
• Office 365 Users
• Office 365 Video
• OneDrive
• OneDrive for Business
• OneNote
• Outlook.com
• Outlook Tasks
• Power BI
• Project Online
• SharePoint Online
• VS Team Services
• Wunderlist
• Yammer

11. Workflow in the cloud
Powerful control flow
Connect disparate
applications
No code designer for
rapid creation

12. Templates

13. Debugging and
History
Trigger history / Run history
Monitoring view
Diagnostics & Alerts
Call Logic App on new Alert
Azure

14. • Hosted Logic Apps designer
• Persist using deployment templates
• Source Control & CI/CD
• Cloud Explorer extension
• Integration Account configurability
• Develop XML collateral
• XSLT Mapper
• XML schemas
• Flat file schemas
Logic Apps tools for Visual Studio

15. Workflow Constructs

16. Triggers
Creates new instances of
Logic Apps
• Runs based on a defined schedule.Recurrence
•Serves as an endpoint that you call via an HTTP Request.Request
•Poll a specified endpoint and check the response in order.HTTP
•APIConnection is a polling trigger that calls Managed
connectors.APIConnection
•Calls out to a specified URL to register and unregister.HTTPWebhook
•Is a webhook trigger that subscribes to a webhook from a
managed connector.
ApiConnection
Webhook
• Debatch an array into separate instances.Split
• Allow only one instance of a Logic App to run at a
timeSingleton

17. Actions
Invoke other services
Managed Connectors
App Service APIs
API Management
Azure Functions
Workflow
HTTP + Swagger
HTTP

18. Actions
Control
behaviour
Retry Policy
Run After
Response
Webhook
Wait
Terminate

19. Actions
Message
Handling
Compose
Query
Request schema
Parse JSON
Xpath
XSLT
XML validation

20. Actions
Collections
• Encapsulates a set of actions.
• Can be used for error handling and
compensation.
Scope
• If…Else conditions
• Can be nested
Condition
• Determines which path to take based on
values in case statements
Switch Case
• Iterate over a list of items.ForEach
• Loop until a condition is met.
• Exit criteria can be time or condition.
Until

21. Expressions
Built-in functions
• Concat; Substring; Replace; Guid; toLower;
toUpperString
• Equals; Less; lessOrEquals; lessOrEquals;
greaterOrEquals; And; Or; Not; IfLogical
• Int; String; Json; Float; Bool; Coalesce; Base64;
Xml; XPath; EtcConversions
• Add; Sub; Mul; Div; Min; Max; Range; RandMath
• Utcnow; Addseconds; Addminutes; Addhours;
Adddays; FormatDateTimeDate
• Contains; Length; Empty; Intersection; First;
Last; Take; SkipCollection
• Parameters; Action; Actions; Triggers;
ActionsOutput; ActionBody; Item; EtcReferencing

22. Expressions
Operators
• Invoke an expression function@
• Parameters for an expression()
• Array reference
• Property reference
[]
• String interpolation{}
• Property reference.
• Null safe dereference?

24. Patterns

25. Workflow Patterns
• Use Service Bus to send the metadata
• Use Blob Storage to store the messages
• Include only the necessary metadata in the queue for routing
• Put related actions into a “try” scope
runafter try-scope Failed
• Add error handling actions into “finally” scope with a terminate action
• Use transport that provides ordered delivery (e.g. Service Bus queues)
• Use Singleton workflows
• Remove parallelism from foreach

26. In-Order Processing
mytrigger
type ApiConnection
inputs
recurrence
operationOptions singleInstance
forEach_item
type foreach
foreach @body('action1')
actions
operationOptions sequential
runAfter

27. Scalability
• Trigger uses long polling
• For immediate firing *minimum* polling interval should be 30 seconds
• Throttled at 2000 actions/min
• Use multiple Logic Apps sharing connection
• Use multiple connections
• Each Trigger can receive multiple messages in ‘batch’

28. Best Practices
• Allows for reuse
• Resubmit at appropriate granularity
• Increased parallelizability
• Check to see if there’s a built-in function
• Fall back to an Azure Function
• Request triggers are operations on an API
• Allows for vanity names, heterogenous APIs, telemetry, load balancing
• Consistent management of all API endpoints
• Works across VNETS

29. Thanks!