Spring Data Repositories - A Deep Dive

Slides of my talk on Spring Data repositories at 33degree conference in Warszaw, Poland.

Transcript

1. Spring Data
   Repositories
   A Deep Dive
   Oliver Gierke
   

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2. Oliver Gierke
   SpringSource
   Spring Data modules
   Core / JPA / Mongo
   ogierke@vmware.com
   www.olivergierke.de
   olivergierke
   

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3. Hands on
   

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4. Sample code
   https://github.com/olivergierke/
   repositories-deepdive
   

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5. Step 0
   Initial project setup
   

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6. Summary
   Use kickstart projects to ease setup
   

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7. Step 1
   Basic JPA infrastructure setup
   

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8. "Persistence technology of choice is JPA.
   e application uses JavaConfig and
   sample data contained in data.sql.
   

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9. Summary
   Easy setup through JavaConfig
   XML-less JPA configuration
   

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10. Step 2
    Quickstart
    

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11. "e implementation of the persistence
    layer will be based on the Spring Data
    repositories abstraction. Customers can
    be saved, looked up by their id, email
    address.
    

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12. Summary
    Interface-based programming model
    No implementation required
    Queries derived from method names
    

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13. Step 3
    Extended CRUD methods
    

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14. " Customers can be deleted and obtained all
    at once.
    

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15. Summary
    Switched to CrudRepository
    Exposed CRUD methods
    Broad API exposed
    

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16. Step 4
    Pagination
    

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17. "Customers can be accessed page by page.
    

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18. Summary
    Switched to PagingAndSortingRepository
    Exposed CRUD methods and paging ones
    Broad API exposed
    

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19. Step 5
    Re-declaring existing CRUD methods
    

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20. "CustomerRepository.findAll() should
    rather return a List. e transaction
    timeout for save(…) should be
    customized to 10 seconds.
    

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21. Summary
    Re-declare methods to customize
    Return types
    Annotation config (Tx, Locking)
    

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22. Step 6
    Introducing a read-only repository base
    interface
    

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23. "Products shall be accessible in read-only
    mode only.
    

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24. Summary
    Craft custom base interface
    Return types
    Annotation config (Tx, Locking)
    

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25. Step 7
    Using manually defined queries
    

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26. "As a user, I want to look up products by
    their custom attributes.
    

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27. Summary
    @Query annotation
    JPA named queries
    Spring Data named queries
    

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28. Step 8
    Flexible predicate execution
    

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29. "As a user, I want to search for customers
    by firstname, lastname, email address
    and any combination of them
    

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30. Summary
    Querydsl - type safe queries for Java
    QuerydslPredicateExecutor
    

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31. Side track:
    Repository proxies
    

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32. Proxy mechanism
    Using Spring's JDK proxy support
    Bootstrap through Factory
    Spring FactroyBean / CDI
    XML namespace / @EnableRepositories
    

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33. Proxy mechanism
    Query interface
    CRUD implementation class
    QueryDslPredicateExecutor
    Custom implementation extension
    

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34. Step 9
    Custom implementations for repositories
    

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35. "As an admin user, I'd like to delete all
    products beyond a given price.
    

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36. Summary
    Provide custom implementation
    Base class support (Querydsl)
    

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37. Stuff on top
    Spring MVC integration
    Spring Data REST
    Spring Roo
    

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38. Up and beyond
    

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39. Supported
    modules
    JPA
    MongoDB
    Neo4j
    Gemfire
    

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40. Community
    implementations
    Spring Data Solr
    Couchbase
    Elasticsearch
    FuzzyDB
    

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41. Summary
    

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42. Interface-based
    programming
    model
    

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43. Start simple, get
    more sophisticated
    

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44. Declarative
    query execution
    

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45. Flexible predicate
    execution
    

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46. Custom
    implementation
    

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47. CDI integration
    

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48. Spring Data
    Modern Data Access For Enterprise Java
    NoSQL
    JPA
    JDBC
    Redis
    Big Data Hadoop
    HBase
    MongoDB Neo4j REST exporter
    Roo
    Hive
    Pig
    Querydsl Repositories
    Gemfire
    Splunk
    Free JPA chapter - http://bit.ly/sd-book-chapter
    

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49. Spring Data Book
    http://bit.ly/sd-book
    

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50. Questions?
    

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51. Thank you!
    

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52. Code
    https://github.com/olivergierke/
    repositories-deepdive
    https://github.com/olivergierke/
    spring-restbucks
    

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