SpringOne Platform 2017 Christoph Strobl, Pivotal; Mark Paluch, Pivotal How do you improve efficiency, reduce latency and memory footprint of your data access? Reactive Streams on top of a functional-reactive programming model are key. Both are two predominant concepts in reactive systems, that completely change how we approach data access in applications today. Reactive data access improves resource usage efficiency and eliminates several constraints of today’s imperative approaches. This talk covers non-blocking data access using Spring Data for NoSQl data stores and Project Reactor. You will learn how to integrate Spring Data repositories in an end-to-end reactive web application. If you are a developer looking to consume data in a functional reactive style, this is your chance to gain the experience how your application can benefit from streaming data access.

1. Reactive Spring Data
Mark Paluch @mp911de
Christoph Strobl @stroblchristoph
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Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/
Spring Data Modules
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JPA

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Reactive Spring Data Modules
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JPA

5. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a
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Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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6. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/

7. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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8. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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9. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
image:FireattheBamberFamilyHome(FALv.1.3License)

10. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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11. Unless otherwise indicated, these slides are © 2013 -2017 Pivotal Software, Inc. and licensed under a Creative Commons
Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/
Reactive data access
• Asynchronous
• Non Blocking
• Event Driven
• Data as stream
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Publisher
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Subscriber
Backpressure
Stream / Flow
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13. Unless otherwise indicated, these slides are © 2013 -2017 Pivotal Software, Inc. and licensed under a Creative Commons
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What it takes…
Project Reactor 3.1
Spring Framework 5.0
Spring Data 2.0
A reactive (asynchronous, ideally non-blocking) driver
Optional: Spring Boot 2.0 (Milestone)
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Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/
What about JDBC/JPA?
JDBC is a blocking API
JPA is a blocking API
Sorry, no reactive JPA support
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15. Unless otherwise indicated, these slides are © 2013 -2017 Pivotal Software, Inc. and licensed under a Creative Commons
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Reactive Spring Data
Reactive Template API
Reactive Repository support
Reduced feature set
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Imperative Template API
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<T> T insert(T objectToSave)
void insertAll(Collection<…> objects)
<T> List<T> find(Query query, Class<T> type)

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Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/
Reactive Template API
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<T> Mono<T> insert(T objectToSave)
<T> Mono<T> insert(Mono<T> objects)
<T> Flux<T> find(Query query, Class<T> type)

18. Unless otherwise indicated, these slides are © 2013 -2017 Pivotal Software, Inc. and licensed under a Creative Commons
Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/
Reactive Repository API
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interface ReactivePersonRepository extends
ReactiveCrudRepository<Person, String> {
Flux<Person> findByLastname(String lastname);
@Query("{ 'firstname': ?0 }")
Mono<Person> customQuery(String firstname);
Flux<Person> findByLastname(Mono<String> lastname);
}

19. Unless otherwise indicated, these slides are © 2013 -2017 Pivotal Software, Inc. and licensed under a Creative Commons
Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/
Reactive Repository API
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interface ReactivePersonRepository extends
ReactiveCrudRepository<Person, String> {
Flux<Person> findByLastname(String lastname);
@Query("{ 'firstname': ?0 }")
Mono<Person> customQuery(String firstname);
Flux<Person> findByLastname(Mono<String> lastname);
}

20. Unless otherwise indicated, these slides are © 2013 -2017 Pivotal Software, Inc. and licensed under a Creative Commons
Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/
Reactive Repository API
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interface ReactivePersonRepository extends
ReactiveCrudRepository<Person, String> {
Flux<Person> findByLastname(String lastname);
@Query("{ 'firstname': ?0 }")
Mono<Person> customQuery(String firstname);
Flux<Person> findByLastname(Mono<String> lastname);
}

21. Unless otherwise indicated, these slides are © 2013 -2017 Pivotal Software, Inc. and licensed under a Creative Commons
Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/
Reactive Repository API
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interface ReactivePersonRepository extends
ReactiveCrudRepository<Person, String> {
Flux<Person> findByLastname(String lastname);
@Query("{ 'firstname': ?0 }")
Mono<Person> customQuery(String firstname);
Flux<Person> findByLastname(Mono<String> lastname);
}

22. Unless otherwise indicated, these slides are © 2013 -2017 Pivotal Software, Inc. and licensed under a Creative Commons
Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/
Reactive Repository API
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interface ReactivePersonRepository extends
RxJava2CrudRepository<Person, String> {
Flowable<Person> findByLastname(String lastname);
@Query("{ 'firstname': ?0 }")
Maybe<Person> customQuery(String firstname);
Single<Person> findByLastname(Mono<String> lastname);
}

23. Unless otherwise indicated, these slides are © 2013 -2017 Pivotal Software, Inc. and licensed under a Creative Commons
Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/
Reactive Repository API
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interface ReactivePersonRepository extends
RxJava2CrudRepository<Person, String> {
Flowable<Person> findByLastname(String lastname);
@Query("{ 'firstname': ?0 }")
Maybe<Person> customQuery(String firstname);
Single<Person> findByLastname(Mono<String> lastname);
}

24. Learn More. Stay Connected.
Spring Data Examples – Repository @ Github
WebFlux Example – Repository @ Github
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#springone@s1p

25. Disclaimer

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