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Serverless CQRS in Azure!
This document discusses serverless Command Query Responsibility Segregation (CQRS) in Azure, covering the architecture and benefits of implementing CQRS with Azure technologies. It presents a use case demonstrating how CQRS can optimize a webshop by improving order processing and error handling. The conclusion emphasizes the effectiveness of CQRS while advising cautious implementation to manage complexity and performance.
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Serverless CQRS in Azure!
- 1. Serverless CQRS inAzure! Toon Vanhoutte https://be.linkedin.com/pub/toon-vanhoutte/6/276/84b
- 2. Toon Vanhoutte Serverless CQRSin Azure!
- 3. Nice to meetyou Toon Vanhoutte Lead Architect @ Codit Belgium Microsoft Azure MVP @toonvanhoutte toonvanhoutte.wordpress.com www.linkedin.com/in/toon-vanhoutte
- 4. Who we are CustomersEntities 2000 Belgium 2004 France 2013 Portugal 2016 Switzerland 2016 UK 2016 The Netherlands 2017 Malta 150 worldwide
- 5.
- 6. Agenda • An Introductionto CQRS • Serverless Technologies in Azure • Use Case: Optimize a Webshop • Conclusion 6
- 7.
- 8. CRUD Architecture Proven andsimple design
- 9. Command Query ResponsibilitySegregation Dealing with complex domain models
- 10. Command Query ResponsibilitySegregation Dealing with high performing applications
- 11. Commands vs Queries Write Reliable Sync/ Async Transactional Persistent Commands Queries Read Volatile Sync Non Transactional In Memory Fast Fast
- 12.
- 13. Pizza as aService
- 14. 14 Serverless Technology Options AzureFunctions “Code triggered by events” Azure Logic Apps “Workflows triggered by events” Azure Event Grid “Serverless event routing service” Azure Service Bus “Reliable messaging platform”
- 15. Pricing Model Security Runtime Monitoring Deployment State Networking Connectivity Exception Handling Developerexperience Azure Functions Azure Logic Apps
- 16. Azure Functions AzureLogic Apps Preferred option for complex synchronous request/response calls. Preferred option for asynchronous fire-and- forget messaging. Azure Functions perfectly extends Azure Logic Apps.
- 17. Command Query Report TransferNotification MeasurementAssignment Job Update Request Trace Handover Azure ServiceBus Azure Event Grid © Clemens Vasters
- 18. Azure Service BusAzure Event Grid Command Query ReportTransfer Notification Measurement Assignment Job Update Request Trace Handover Passing Intents Reporting Facts Messaging Eventing Discrete Series © Clemens Vasters
- 19. Azure Service BusAzure Event Grid Passing Intents Reporting Facts Messaging Eventing Discrete Series “PriceUpdated” “OpportunityWon” “InvoiceBooked” Temperature stream Telemetry data Audit trail “CreateOrder” “BookHotel” “UpdateStock” © Clemens Vasters
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- 21. Pizza Antonio Find outhow CQRS will save Antonio’s business!
- 22. Pizza Antonio Website € 10€12€ 11 Submit Query Command
- 23. Pizza Antonio QueryCommand GetProducts CreateOrder SQLDatabase Very goodpizza’s Customers get errors when ordering pizza during peak hours
- 24. Pizza Antonio QueryCommand GetProducts CreateOrder SQLDatabase Customers don’tget any errors anymore The orders don’t make it to the database, so no pizza
- 25. Pizza Antonio QueryCommand GetProducts CreateOrder SQLDatabase All ordersmake it to the database Polling during quiet hours is rather expensive, so more expensive pizza’s
- 26. Pizza Antonio QueryCommand GetProducts CreateOrder SQLDatabase Cheaper pollingmechanism, so again sharper prices No flexible way to send order confirmations through email
- 27. Pizza Antonio QueryCommand GetProducts CreateOrder SQLDatabase Flexible extensionpoints for e.g. emails Two different URL’s and security keys for the website
- 28. Pizza Antonio QueryCommand SQLDatabase GetProducts CreateOrder AzureFunctionProxy Uniform APIfor website Loading products on the website is extremely slow during peak hours
- 29. Pizza Antonio QueryCommand SQLDatabase GetProducts CreateOrder AzureFunctionProxy Fast responsivetimes on the website No flexible way to update products on external food delivery services
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- 33. CQRS is aproven design pattern! It exists in many different variations Azure Function Proxy SQL Database QueryCommand Sentinet SQL Database QueryCommand Azure API Mgmt SQL Database QueryCommand Cache
- 34. Lessons learned Azure FunctionsAzure Event Grid Consumption plan results in cold starts, also for function proxies! Solution: • Keep it warm (5 min) • App Service Plan • Pre-compiled functions Event Grid puts responsibility for sequencing at receive side! Solution: • Use it wisely • Consider Azure Service Bus if sequencing is required
- 35. Architectural Advise onCQRS Do not overengineer! Performance Flexibility Scalability Advantages Idempotence Resiliency Eventual Consistency Challenges Complexity Maintenance Monitoring Disadvantages Apply CQRS carefully on specific parts of the solution!
- 36. Thank you! Keep intouch. @toonvanhoutte toonvanhoutte.wordpress.com www.linkedin.com/in/toon-vanhoutte
Editor's Notes
- #10 From a DDD perspective, where the business complexity requires two separate models for read and write models. Eg one database with write against database tables and reads done based on views that are optimized for the UI
- #11 Improve performance, scalability and flexibility
- #12 Improve performance, scalability and flexibility