Workflow All the Things with Azure Logic Apps
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From Music City Code 2017 - A brief tour of Azure Logic Apps functionality and integration with Azure ecosystem services.
![Expressions
Operators
• Invoke an expression function@
• Parameters for an expression()
• Array reference
• Property reference
[]
• String interpolation{}
• Property reference.
• Null safe dereference?](https://image.slidesharecdn.com/logicapps-170605131008/85/Workflow-All-the-Things-with-Azure-Logic-Apps-22-320.jpg)
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Workflow All the Things with Azure Logic Apps
- 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
- 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
- 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!