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What’s new in Spring Data?Oliver Gierke - Thomas Darimont - Christoph Strobl
Agenda
Overview Repositories
Store modules Q&A
Release train
!• Release coordination effort make sure modules are compatible
• Reduce different versions into a single canonical name to refer to
Release train
03/2013
Arora
09/2013
Babbage
02/2014
Codd
05/2014
Dijkstra
09/2014
Evans
Spring Data Modules
Core
Neo4j Gemfire
JPA
Solr
Elasticsearch
REST
CassandraCouchbase
Redis
MongoDB
Communitymodules
Coremodules
Module setup - Codd
Core
Neo4j Gemfire
JPA
Solr
Elasticsearch
REST
CassandraCouchbase
Redis
MongoDB
Communitymodules
Coremodules
Module setup - Dijkstra / Evans
Core
Neo4j Gemfire
JPA
Solr
Elasticsearch
REST
CassandraCouchbase
Redis
MongoDB
Communitymodules
Coremodules
Evans GA!Hooray! \o/
Spring Data Evans - Major themes
• Upgrade to Spring 4.0
• Support for top/first keywords in derived queries
• Support for MongoDB 2.6 features like text search
• SpEL support for Spring Data JPA (Spring Security integration)
• Redis Sentinel support
• ALPS and excerpt projections for Spring Data REST
• Improved multi-store configuration
• Asciidoctor for reference documentation
Spring DataRepositories
Pragmatic data access APIs
Multi-storeconfiguration
We know what you were thinking!
Improved multi-store configuration
!• Triggered if multiple Spring Data modules are detected
• Modules only register for interfaces that a assigned to the store • Annotations on domain types (@Entity, @Document) • Store specific repository base interface (not recommended)
Debug output
… DEBUG … - Multiple Spring Data modules found, entering strict repository configuration mode! !… DEBUG … - Spring Data JPA - Could not safely identify store assignment for repository candidate interface ….OrderRepository. !… DEBUG … - Spring Data JPA - Registering repository: Interface: ….CustomerRepository Factory: ….JpaRepositoryFactoryBean
Query methods
SlicesPaging without the overhead
Slices
!• Pagination
• Additional query to calculate the total number of elements !
• Slices • Reads one more element than necessary to find out about presence of next slice (optional)
• Store-specific optimization
(Optional) supportNo more NullPointerExceptions with Java 8 or Guava
Default methods
Slices and Optional example
interface SampleRepository implements Repository<User, Long> { Slice<User> findByLastname(String lastname, Pageable page); ! Optional<User> findByEmailAddress(EmailAddress email); ! Optional<User> findByLastname(String lastname); ! default Optional<Customer> findByLastname(Customer c) { return findByLastname(c == null ? null : c.lastname); } }
Limiting result setsYou’r only interested in the top ones anyway, right?
Limiting result sets
!• Previous options
• Use Pageable/Page to dynamically restrict results
• Additional keywords to statically restrict results
interface SampleRepository implements Repository<User, Long> { List<User> findTop10ByNameLike(String name, Sort sort); }
Deriveddelete queries
Demo
Miscellaneous
CDI improvementsEager instantiation and custom implementations
Commongeo-spatial types
NullsFirst /NullsLast
Store moduleimprovements
JPAJava Persistence API 2.1 support
JPA Improvements
!• JPA 2.1 support
• Execution of stored procedures • Support for entity graph definitions !
• Integration with Spring Security • Out of the box support coming with Spring Security 4.1
Demo
MongoDB
Aggregationgo on with system variables
Aggregation Framework
!• System Variables
• $$ROOT
• $$CURRENT
Aggregation aggregation = Aggregation.newAggregation( group(„foo"). push(Aggregation.ROOT).as("users"));
Query ModifiersAlter query behavior
Query Modifiers
• Define output and behavior of query
• $comment
• $maxTimeMS
• …
interface SampleRepository implements Repository<User, Long> { @Meta(comment=“s2gx2014”) List<User> findByFirstname(String firstname); }
Full $text searchSimple - Powerful - Easy
Text Search
!• Supported since MongoDB 2.6
• Multiple stemmers
• Different languages
interface SampleRepository implements Repository<User, Long> { List<User> findAllBy(TextCriteria criteria); }
Redis
SCANThe non-blocking alternative
SCAN Support
• Non-blocking alternative
• KEYS
• SMEMBERS
Cursor<String> keys = redisConnection.scan(); !while(cursor.hasNext()) { cursor.next(); }
SentinelMonitoring & failover for your cluster
Sentinel Support
!• Monitoring and failover
• Currently only available using Jedis
@Bean public RedisSentinelConfiguration sentinelConfig() { return new RedisSentinelConfiguration().master("mymaster") .sentinel("localhost", 26379) .sentinel("localhost", 26380); }
Sentinel support
Redis
Sentinel support
Redis Redis Redis
Sentinel support
Redis Redis Redis
Sentinel Sentinel Sentinel
Sentinel support
Redis Redis Redis
Sentinel Sentinel Sentinel
Sentinel support
Redis Redis Redis
Sentinel Sentinel Sentinel
Sentinel support
Redis Redis Redis
Sentinel Sentinel Sentinel
Sentinel support
Redis Redis Redis
Sentinel Sentinel Sentinel
Sentinel support
Redis Redis Redis
Sentinel Sentinel Sentinel
Sentinel support
Redis Redis Redis
Sentinel Sentinel Sentinel
Solr
Deep paginationGo deep at top speed
Deep pagination
!• Performance boost when going deep
• Uses cursor
Cursor<User> cursor = template.queryForCursor(q, User.class); !while(cursor.hasNext()) { User user = cursor.next(); }
Schema SupportClient side schema management
Schema Support
!• Usage of Schema Solr REST API
• Add new fields to existing schema.
@Configuration @EnableSolrRepositories(schemaCreationSupport = true) class SolrConfiguration { !}
Spring Data REST
Spring Data REST
• Implements common patterns on top of repositories • Collection / item resources • Association resources • Search resources
• Leverages hypermedia and internet standards • URI Templates (RFC 6570) • application/hal+json • text/uri-list (RFC 2483) • profile link relation (RFC 6906)
ALPS support & excerpt projections
!• Application Level Profile Semantics
• Spring Data REST exposes resources describing the service
!• Interface-based programming model to define custom projections
• Configuration to define excerpt projections
Demo
Related talks
Spring Data Related Talks
• Cassandra / Couchbase - Tue, 4:30 pm • Cassandra, Couchbase and Spring Data in the Enterprise
• Spring Data BOF - Tue, 9:00 pm
• REST - Wed, 8:30 am • Spring Data REST - Data Meets Hypermedia
• Neo4j - Wed, 10:30 am • Artistic Spring Data Neo4j 3.0 with Spring Boot and Van Goch
• GORM - Wed, 12:45 pm • Advanced GORM – Beyond Relational
Sample codehttps://github.com/SpringOne2GX-2014/whats-new-in-spring-data
Questions?
