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SPRING FOR ARCHITECTURALLY CURIOUS DEVELOPERS Oliver Drotbohm odrotbohm@vmware.com / odrotbohm

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Coming in 2023… Follow @mawspring on

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The Domain

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Orders Inventory Order Line items Stock Inventory items

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Unfortunately, Post-its don't run in production…

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Unfortunately, Post-its don't run in production… … except you work at Miro.

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Awesome! ! Now… what? "

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Let's get started… src/main/java ….acme.myproject ….acme.myproject.domain ….acme.myproject.persistence ….acme.myproject.service ….acme.myproject.web

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Let's get started… src/main/java ….acme.myproject ….acme.myproject.domain ….acme.myproject.persistence ….acme.myproject.service ….acme.myproject.web #$

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via https://devopedia.org/cohesion-vs-coupling

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Domain Based Structure Domain Based Boundaries via Dan North – CUPID—for joyful coding Video cast episode @ Software Architektur im Stream (english)

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src/main/java ….acme.myproject ….acme.myproject.customer ….acme.myproject.inventory ….acme.myproject.order Much better… %!

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via https://devopedia.org/cohesion-vs-coupling

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Web Business logic Data access @Repository Order Inventory … @Controller @Service Verification? Testing? Documentation? Observation?

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Sample code https://github.com/odrotbohm/arch-evident-spring

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Demo time! &!

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Error Scenarios Transactional Event Listeners

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@EventListener @EventListener … @TransactionalEventListener @TransactionalEventListener … @Transactional Event Event Commit Consistency boundary Spring bean Legend

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Error scenarios

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What if a transactional event listener fails? "

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@EventListener @EventListener … @TransactionalEventListener @TransactionalEventListener … @Transactional Event Event Commit Consistency boundary Spring bean Legend Publication lost! ) '(

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Event Publication Registry

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@TransactionalEventListener @TransactionalEventListener … Event @TransactionalEventListener … @TransactionalEventListener … Transaction Commit

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Demo time! &!

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Spring Modulith A convention to map modules to packages Simple set of access rules and API to verify Test support to bootstrap modules Documentation support Observability support

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Thank you! Questions? Oliver Drotbohm odrotbohm@vmware.com odrotbohm Sample Code