Tech Talk - Persistence with Spring Data

Transcript

1. ©2022 VMware, Inc.
   Persistence with
   Spring Data
   what it is and what comes next
   Christoph Strobl (he/him)
   Staff Engineer
   March 2022
   

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2. ©2022 VMware, Inc. 2
   MongoDB
   Redis
   Elasticsearch
   Cassandra
   MariaDB
   DynamoDB
   Neo4j
   Couchbase
   CouchDB
   Greenplum
   Hazelcast
   H2
   SQL Server
   Oracle
   Db2
   Areospike
   OrientDB
   MySQL
   PostgreSQL
   ©2022 VMware, Inc.
   

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3. ©2022 VMware, Inc. 3
   SELECT e FROM employee e WHERE e.firstName = :name
   JPA
   create().select().from(EMPLOYEE)
   .where(EMPLOYEE.FIRST_NAME).eq(name)
   .fetch()
   JOOQ
   db.employee.find({ first_name : name })
   NoSQL
   SELECT * FROM employee WHERE first_name = %1
   SQL
   MATCH (n:Employee) WHERE n.firstName = ’...’
   query: { match: { first_name: '...' } }
   

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4. ©2022 VMware, Inc. 4
   List findByFirstName(String name)
   Spring Data
   JPA
   JDBC
   Redis
   Neo4j
   R2DBC
   MongoDB
   ArangoDB
   Couchbase
   Cosmos DB
   yugabyteDB
   Elasticsearch
   Apache Geode
   Apache Cassandra
   ...
   

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5. ©2022 VMware, Inc. 5
   No Magic
   

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6. ©2022 VMware, Inc. 6
   Anatomy
   Entity Manager
   Database Driver
   Template API
   Mapping
   Conversion
   Resource & Transaction
   Management
   native store format <> domain type
   eg. enum -> string
   Default Implementation
   Repository Interface
   List findByFirstName(String name)
   

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7. ©2022 VMware, Inc. 7
   Template APIs
   class MongoTemplate implements MongoOperations {
   List find(Query query, Class entityClass)
   List findAndRemove(Query query, Class entityClass)
   T execute(Class> entityClass, CollectionCallback callback)
   query(where(“firstName”).is(...))
   template.execute(Employee.class, collection -> {
   return collection.find(new Document("firstname", "..."))
   .into(new ArrayList());
   });
   Access to native
   driver commands
   

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8. ©2022 VMware, Inc. 8
   Repositories
   interface Repo extends ...{ Repository
   CrudRepository
   findAll();
   findById(...)
   count();
   save(...);
   delete(...);
   ...
   PagingAndSorting
   Repository
   findAll(Page);
   findAll(Sort);
   Proxy
   Default Implementation
   Store Specific
   List findAll();
   long count();
   Predefined methods
   List findByFirstName(String name);
   Derived Finder Method
   

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9. ©2022 VMware, Inc. 9
   Derived Find Queries
   List findEmployeeByFirstNameLikeOrderByAgeAsc(String name)
   read
   get
   query
   search
   stream
   Placeholder For Anything You Like
   matches
   contains
   lessThan
   startsWith
   greaterThan
   isEmpty
   isNull
   isNotNull
   before
   after
   ...
   Match Operator
   Sort Direction
   Delimiter
   Employee
   Page
   Slice
   Stream
   

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10. ©2022 VMware, Inc. 10
    Derived Count | Exists | Delete Queries
    int countEmployeeByFirstNameLike(String name)
    boolean existsEmployeeByFirstNameLike(String name)
    Some Stores Need a Little Help
    @Modifying
    List deleteEmployeeByFirstNameLike(String name)
    remove
    void
    long
    Interested in the
    Operation Result?
    

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11. ©2022 VMware, Inc. 11
    Data Projections
    List findByFirstName(String name)
    Closed Interface Projection
    interface View2 {
    String getFirstName();
    String getLastName();
    }
    class View1 {
    String firstName;
    String lastName;
    }
    DTO Projection
    interface View3 {
    @Value(“#{target....}”)
    String getName();
    }
    Open Interface Projection
    Flexible View On Your Data
    

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12. ©2022 VMware, Inc. 12
    Reactive
    Flux findByFirstName(String name)
    a Reactive Stream of Data
    

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13. ©2022 VMware, Inc. 13
    Not one API
    to rule them all
    

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    @Entity
    class Employee {
    @Id
    @GeneratedValue(...)
    Long id;
    @Column(name="FIRST_N")
    String firstName;
    ...
    }
    @Document
    class Employee {
    @Id
    Long id;
    @Field(name="first_n")
    String firstName;
    ...
    }
    JPA MongoDB
    

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15. ©2022 VMware, Inc. 15
    class Employee {
    Long id;
    String firstName;
    String lastName;
    Manager manager;
    }
    class Manager {
    Long id;
    String name;
    List employees
    }
    ID Name
    1000 Marvin
    ID FIRST_N LAST_N MANAGER_ID
    1 Ford Prefect 1000
    table based
    manager
    employee
    linking by default
    {
    _id : 1000,
    name : Marvin,
    employees : [
    {
    id : 1,
    firstName : Ford,
    lastName : Prefect
    }
    ...
    document
    store
    embedding by default
    

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16. ©2022 VMware, Inc. 16
    Native Queries
    @Query(“SELECT m, COUNT(e) FROM Manager m
    JOIN m.employees e GROUP BY e.name”)
    List listManagerWithEmployeeCount();
    JPA
    @Aggregation(“{ $project: { id : 1, name: 1, $size : employees } }”)
    List listManagerWithEmployeeCount();
    MongoDB
    

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17. ©2022 VMware, Inc. 17
    Richer / Slimmer API
    Read the Documentation
    for store specific features
    @Procedure(”Employee.increaseSalary”)
    Integer increaseSalary(Integer raise);
    JPA
    Stored Procedure call
    GeoResults findByOfficeLoactionNear(Point p, Distance max)
    List
    Stream
    Geospatial Query
    @Update(”{ ... }”)
    Integer findAndIncreaseSalaryByName(String name, Integer raise);
    MongoDB Update
    

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18. ©2022 VMware, Inc. 18
    interface Repo extends Repository {
    ...
    }
    Custom Implementations
    interface MyExtension {
    Reward beKind(Person person);
    }
    class MyExtensionImpl implements MyExtension {
    ExtensionImpl(EntityManager em) { ... }
    public Reward beKind(Person person) {
    ...
    }
    }
    , MyExtension {
    repository fragment
    

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19. ©2022 VMware, Inc. 19
    No Silver Bullet
    

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20. ©2022 VMware, Inc. 20
    Trouble Shooting
    Repository Metrics
    Logfiles
    Network Stats
    Query Planners
    

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21. ©2022 VMware, Inc. 21
    Spring Data provides a
    Familiar & Consistent
    Programming Model
    that resprects
    Store Specific Traits
    

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22. ©2022 VMware, Inc. 22
    What’s next? Spring Data
    2.x & 3.0
    The following is intended to outline the general direction of VMware's
    offerings. It is intended for information purposes only and may not be
    incorporated into any contract. Any information regarding pre-release of
    VMware offerings, future updates or other planned modifications is subject
    to ongoing evaluation by VMware and is subject to change. This information
    is provided without warranty or any kind, express or implied, and is not a
    commitment to deliver any material, code, or functionality, and should not
    be relied upon in making purchasing decisions regarding VMware's
    offerings. These purchasing decisions should only be based on features
    currently available. The development, release, and timing of any features
    or functionality described for VMware's offerings in this presentation remain
    at the sole discretion of VMware. VMware has no obligation to update
    forward looking information in this presentation
    

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23. ©2022 VMware, Inc. 23
    2.x – Property Converters
    class Person {
    Long id;
    String name;
    String ssn;
    }
    @WritingConverter
    class PersonToDocumentConverter implements Converter {
    public Document convert(Person source) { ... }
    }
    @ReadingConverter
    class DocumentToPersonConverter implements Converter {
    public Person convert(Document source) { ... }
    }
    

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24. ©2022 VMware, Inc. 24
    2.x – Property Converters
    class Person {
    Long id;
    String name;
    @ValueConverter(EncryptingValueConverter.class)
    String ssn;
    }
    declarative
    PropertyValueConverterRegistrar registrar = new ...
    registrar.registerConverter(Person.class, Person::getSsn)
    .writing(utils::encrypt)
    .reading(utils::decrypt);
    programmatic
    new
    in
    2.x
    

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25. ©2022 VMware, Inc. 25
    3.0 - Baseline & Upgrades
    • Java 17
    • Jakarta EE 9
    • Hibernate 6
    • Validation API
    • CDI Extensions
    • ...
    

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26. ©2022 VMware, Inc. 26
    3.0 - API Refinements
    Repository
    CrudRepository
    Iterable findAll();
    Iterable saveAll(...);
    T findById(...)
    long count();
    void delete(...);
    ...
    PagingAndSorting
    Repository
    Page findAll(Page);
    ...
    ListCrudRepository
    List findAll();
    List saveAll(...);
    T findById(...)
    long count();
    void delete(...);
    ...
    

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27. ©2022 VMware, Inc. 27
    3.0 - Observability
    AppOptics, Azure Monitor, Netflix Atlas, CloudWatch, Datadog,
    Dynatrace, Elastic, Ganglia, Graphite, Humio, Influx/Telegraf, JMX,
    KairosDB, New Relic, Prometheus, SignalFx, Google Stackdriver,
    StatsD, Wavefront
    

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28. ©2022 VMware, Inc. 28
    3.0 - GraalVM native
    • static type hints
    • dynamic configuration
    processors
    

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29. Thank You
    ©2022 VMware, Inc.
    

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