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With an open source workflow engine
Decoupling your Spring boot Microservices
With an open source workflow engine
Orchestrating Spring Boot Microservices(In order to get coffee quickly)
Niall Deehan Grifty Winters
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A Classic Distributed System
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Service One Service TwoRest
Response
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A Classic Distributed System
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Service One Service Two Service ThreeRest
Response
Rest
Response
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Congratulations! You’ve got a coffee
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Who’s next?
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Things to think about?
• Barista takes a break• Order is taking while• “We don’t do mochachinos”
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Starbucks does not use two-phase commit
Gregor Hohpehttps://www.enterpriseintegrationpatterns.com/ramblings/18_starbucks.html
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The System of Kaffee und Kuchen
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Cashier:Takes orders
Order Sorter:Can get Cake!
Barista:Makes Coffee
Order
Coffee Ready
Coffee
Complete
Demo!
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https://github.com/NPDeehan/kaffee-und-kuchen
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Lets Make some changes to our system
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What needs to change?
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Cashier:Takes orders
Order Sorter:Can get Cake!
Barista:Makes Coffee
Order
Coffee Ready
Coffee
Complete
We Need to Hold State
● Retry● Timeout● Callback to Cashier● Versioning● Error Handling
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Live coding!
https://github.com/NPDeehan/kaffee-und-kuchen
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Lets deal with the issues
• What happens if the barista is taking a quick break?• Hold State until the barista is back
• What happens if the order is taking too long?• Let the customer know we’re still working on it
• What happens if the order can’t be completed for business reasons - not technical reasons?• BPMN Error event!
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Things to think about?
• Barista takes a break• Order is taking while• “We don’t do mochachinos”
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Live coding!
https://github.com/NPDeehan/kaffee-und-kuchen
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What did we Achieve
• Better throughput• Better error handling• Scale better• Visualization• Timer(?)• Saga(?)
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What needs to change?
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Cashier:Takes orders
Order Sorter:Can get Cake!
Barista:Makes Coffee
Order
Coffee Ready
Coffee
Complete
● Retry● Timeout● Callback to Cashier● Versioning● Error Handling
We Need to Hold State
Visualization!
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start.camunda.com
THE END
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