What's new in Spring Data Lovelace

What’s new in SpringData
Christoph Strobl
@stroblchristoph
Lovelace
30min

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Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons
Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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License: PD
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Augusta Ada King (Ada Lovelace) was an English mathematician known for her work  
on Charles Babbage’s proposed mechanical general-purpose computer, the Analytical Engine. (1815-1852)

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https://pixnio.com/de/landschaften/nacht/astronomie-galaxie-himmel-dunkel-daemmerung-konstellation-dunkel-nacht 
License: PD
3
352 Days
900+ Issues
16 Modules
JDBC
Transactions
Reactive
Performance
Client Sessions
Change Streams
Distinct Queries
Fluent API
Kotlin Extensions
JCache
Cluster SCAN
Pub/Sub
Vavr

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Image: https://pixnio.com/de/landschaften/wald/holz-natur-sommer-pflanzen-rasen-dawn-farn-landschaft-baum-blatt-umwelt
License: PD
Data Commons

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Methods that create a clone but with one changed field.
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Immutable Setters (Wither Methods)
class ValueClass {
final @Nullable String id;
final String value;
ValueClass(@Nullable String id, String value) {
this.id = id;
this.value = value;
}
ValueClass withId(String id) {
return new ValueClass(id, this.value);
}
String getId() {
return this.id;
}
String getValue() {
return this.value
}
}
https://pixnio.com/de/landschaften/steinformationen/felsen-himmel-steinen#  
License: PD

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Methods that create a clone but with one changed field.
6
class ValueClass {
final @Nullable String id;
final String value;
ValueClass(@Nullable String id, String value) {
this.id = id;
this.value = value;
}
ValueClass withId(String id) {
return new ValueClass(id, this.value);
}
String getId() {
return this.id;
}
String getValue() {
return this.value
}
}
class ValueClass {
@Nullable String id;
final String value;
ValueClass(String value) {
this.value = value;
}
String getId() {
return this.id;
}
String getValue() {
return this.value
}
}
!
Immutable Setters (Wither Methods)
https://pixnio.com/de/landschaften/steinformationen/felsen-himmel-steinen#  
License: PD

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Repository Initialization
0
10
20
30
40
Default Deferred Lazy
Bootstrap Time (less is better)
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JPA
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License: PD

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License: PD
JPA Repository Initialization
9
0
10
20
30
40
for JPA 
infrastructure
spring-projects/spring-data-examples
jpa/deferred

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License: PD
JPA Repository Initialization
10
0
10
20
30
40
for JPA 
infrastructure
@Configuration
@EnableJpaRepositories
class JpaRepositoryConfiguration { }
jpa/deferred

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License: PD
Deferred JPA Repository Initialization
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0
10
20
30
40
for JPA 
infrastructure
@Configuration
@EnableJpaRepositories(bootstrapMode = BootstrapMode.DEFERRED)
class LazyJpaRepositoryConfiguration {
}
@Bean
LocalContainerEntityManagerFactoryBean entityManagerFactory(JpaVendorAdapter vendorAdapter,…
ThreadPoolTaskExecutor threadPoolTaskExecutor = new ThreadPoolTaskExecutor();
threadPoolTaskExecutor.setDaemon(true);
threadPoolTaskExecutor.afterPropertiesSet();
LocalContainerEntityManagerFactoryBean emf = new LocalContainerEntityManagerFactoryBean();
emf.setBootstrapExecutor(threadPoolTaskExecutor);
emf.setDataSource(dataSource);
emf.setJpaVendorAdapter(jpaVendorAdapter);
emf.setPackagesToScan("com.example");
return emf;
}
jpa/deferred
spring.data.jpa.repositories.bootstrap-mode=

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License: PD
Lazy JPA Repository Initialization
12
for JPA 
infrastructure
0
10
20
30
40
@Configuration
@EnableJpaRepositories(bootstrapMode = BootstrapMode.LAZY)
class DeferredJpaRepositoryConfiguration {
}
@Bean
LocalContainerEntityManagerFactoryBean entityManagerFactory(JpaVendorAdapter vendorAdapter,…
ThreadPoolTaskExecutor threadPoolTaskExecutor = new ThreadPoolTaskExecutor();
threadPoolTaskEx …
}
jpa/deferred
How
Fast is Spring? 
tomorrow
10:30am

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13
JDBC
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License: PD

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License: PD
JDBC Repositories
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Spring Data JDBC 
2:00pm | National Harbor 4-5
interface LegoSetRepository extends CrudRepository {
@Query("SELECT m.name model_name, m.description, l.name set_name
FROM model m JOIN lego_set l ON m.lego_set = l.id
WHERE :age BETWEEN l.min_age and l.max_age")
List reportModelForAge(@Param("age") int age);
@Modifying
@Query("UPDATE model SET name = lower(name) WHERE name !<> lower(name)")
int lowerModelName();
}
jdbc/basic

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R2DBC
sneak peek
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License: PD

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License: PD
Reactive Database Client
16
@Configuration
class ReactiveDbcConfiguration {
@Bean
TransactionalDatabaseClient dbClient() {
return TransactionalDatabaseClient.create(new PostgresqlConnectionFactory(…));
}
}
Flux deleted = databaseClient.inTransaction(db !-> {
Mono insert = db.insert()
.into(Lego.class)
.using(legoSet)
.then();
Mono delete = db.execute()
.sql("DELETE FROM lego WHERE id = $1")
.bind("$1", 42055)
.fetch()
.rowsUpdated();
return insert.then(delete);
});
Reactive Relational Database Connectivity 
jdbc/r2dbc

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MongoDB
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License: PD

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License: PD
MongoDB 4.0 Multi Document Transactions
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@Configuration
class TransactionConfiguration {
@Bean
MongoTransactionManager txManager(MongoDbFactory dbFactory) {
return new MongoTransactionManager(dbFactory);
}
}
new TransactionTemplate(txManager).execute(action !-> {
orderRepository.save(order);
UpdateResult result = mongoOps.update(Book.class)
.matching(query(where("id").is(book.id)…
.apply(new Update().inc("available", -1)) !//
.first();
if (result.getModifiedCount() !!= 1) {
throw new BookSoldOutException(book);
}
return order;
});
try (ClientSession session = client.startSession()) {
session.startTransaction();
col.insertOne(session, order);
UpdateResult result = col.updateOne(session, …
if (result.getModifiedCount() !!= 1) {
throw new BookSoldOutException(book);
}
session.commitTransaction();
}
mongodb/transactions
Next Generation MongoDB 

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License: PD
Validators & Json Schema
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Criteria criteria = where("name").exists(true).ne(null).type(2)
.and("age").exists(true).ne(null).type(16).gte(0).lte(125);
Validator validator = Validator.criteria(criteria);
MongoJsonSchema schema = MongoJsonSchema.builder()
.required("name", "age")
.properties(
string("name").minLength(1),
int32("age").gte(0).lte(125)
.build();
Validator validator = Validator.schema(schema);
{
"name" : {
"$exists" : true,
"$ne" : null,
"$type" : 2
},
"age" : {
"$exists" : true,
"$ne" : null,
"$type" : 16,
"$gte" : 0,
"$lte" : 125
}
}
{
"type": "object",
"required": [ "name", "age" ],
"properties": {
"name": {
"type": "string",
"minLength": 1
},
"age": {
"bsonType": "int",
"minimum" : 0,
"exclusiveMinimum" : false,
"maximum" : 125,
"exclusiveMaximum" : false
}
}
}
mongodb/schema-validation

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License: PD
Distinct Queries
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List values = template.query(Inventory.class)
.distinct("size")
.all();
List values = template.query(Inventory.class)
.distinct("size")
.as(String.class)
.all();
SELECT DISTINCT col1, col2, … 
FROM table
db.inventory.distinct("size")
> [ "M", "S", "L"]
{
name: "INV-1",
size: "M"
}
{
name: "INV-2",
size: [ "S", "L" ]
}
{
name: "INV-3",
size: { "length" : 10, "height" : 10 }
}

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License: PD
Change Streams
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MessageListenerContainer container = new DefaultMessageListenerContainer(template);
container.start();
MessageListener, User> listener = …
ChangeStreamRequest request = ChangeStreamRequest.builder()
.collection("user")
.filter(newAggregation(match(where("status").is("active"))))
.publishTo(listener)
.build();
Subscription subscription = container.register(request, User.class);
ChangeStreamOptions options = ChangeStreamOptions.builder()
.filter(newAggregation(match(where("status").is("active")))
.build();
Flux> flux = reactiveTemplate.changeStream("user", options, User.class);
$ db.oplog.rs.find()
.addOption(DBQuery.Option.tailable)
.addOption(DBQuery.Option.awaitData);
> …
mongodb/change-streams

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License: PD
Gemfire 
Geode
Apache

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License: PD
Spring Boot for Apache Geode and Pivotal Gemfire
Health Indicators for
• Cache
• Disk Stores
• Regions
• Pools
• Indexes
• Event Queues
• …
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Spring Session Support
Scaling Spring Boot Apps 
watch the replay!

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Redis
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License: PD

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License: PD
Query By Example
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class RedisRepository extends CrudRepository, QueryByExampleExecutor { }
redis/repositories
Example example = Example.of(new Person().withLastname("stark"));
Iterable starks = repository.findAll(example);

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License: PD
Write to Master read from Replica (aka Slave)
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@Configuration
class WriteToMasterReadFromSlaveConfiguration {
@Bean
public RedisConnectionFactory connectionFactory() {
LettuceClientConfiguration clientConfig = LettuceClientConfiguration.builder()
.readFrom(ReadFrom.SLAVE_PREFERRED)
.build();
RedisStandaloneConfiguration serverConfig = new RedisStandaloneConfiguration("server", 6379);
return new LettuceConnectionFactory(serverConfig, clientConfig);
}
}

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License: PD
Reactive Pub/Sub
27
ReactiveRedisTemplate template = …
Mono publish = template.convertAndSend("channel-1", "message");
template.listenToChannel("channel-1").doOnNext(msg !-> {
!// message processing !!...
}).subscribe();
ReactiveRedisConnectionFactory factory = …
ReactiveRedisMessageListenerContainer container = new ReactiveRedisMessageListenerContainer(factory);
Flux> stream = container.receive(ChannelTopic.of("channel-1"));
Flux> stream = container.receive(ChannelTopic.of("channel-2"));
template.listenToChannel("channel-2").doOnNext(msg !-> {
!// message processing !!...
}).subscribe();
connection
connection
1 connection each
1 shared connection
connection

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License: PD
Reactive SCAN & Cluster SCAN
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ReactiveRedisConnection connection = …
Mono> keys = connection.keyCommands().keys(…);
ReactiveRedisConnection connection = …
Flux keys = connection.keyCommands().scan(…);
Under the Hood of Reactive 

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Cassandra
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License: PD
Lifecycle Events
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public class BeforeConvertListener extends AbstractCassandraEventListener {
@Override
public void onBeforeSave(BeforeSaveEvent event) {
!// does some auditing manipulation, set timestamps, whatever
}
}

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License: PD
Fluent Template API
31
List result = template.query(User.class)
.matching(query(where("jedi").is(true)))
.all()

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License: PD
Fluent Template API (with Kotlin)
32
val result = template.query()
.matching(query(where("jedi").isEqualTo(true)))
.all()

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Neo4j
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License: PD

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License: PD
Neo4j
Housekeeping - naming, structure, components, documentation
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★ SpEL support in @Query
★ Optimistic Locking using @Version
★ Persistence Constructors \ö/
★ Traverse relationships in derived queries

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> Stay Connected.
Spring Data Lovelace out now!  
Check it out with Boot 2.1.M4
#springone
@s1p
6:30 pm Fitness Center 
Level P

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What's new in Spring Data Lovelace

What's new in Spring Data Lovelace

Christoph Strobl

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