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ࣗݾհ
• ։ా ཅհ (@hirakida_)
• LINE Fukuokaגࣜձࣾ ։ൃ1ࣨ
• αʔόʔαΠυΤϯδχΞ
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Vol.1ͰɺSpring FrameworkͷηογϣϯΛ
հ͠·͢
Vol.2ͰɺVictor Rentea͞ΜͷClean Codeʹͭ
͍ͯ͢༧ఆͰ͢
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5BMLT
• Reactive Revolution
• Deepdive into Reactive Spring with Coroutines and Kotlin
Flow
• Bootiful Kotlin
• Bootiful Testing
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R2DBCͱRSocketෳͷηογϣϯͰऔΓ্
͛ΒΕ͍ͯͨͷͰɺઌʹհ͠·͢
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3%#$
https://r2dbc.io/
• Reactive Relational Database Connectivity
• R2DBC is an endeavor to bring a reactive programming
API to SQL databases.
• ΧϯϑΝϨϯεظؒதʢ11/4ʙ11/8ʣ·ͩGAͰͳ
͔ͬͨͷͰ͕͢ɺ12্݄०ʹGAʹͳΓ·ͨ͠
• https://r2dbc.io/2019/12/02/r2dbc-0-8-0-goes-ga
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3%#$%SJWFST
• First-party
• PostgreSQL
• Microsoft SQL Server
• H2 Database
※ first-party
https://github.com/r2dbc
• Community
• MySQL
• https://github.com/mirromutth/r2dbc-mysql
• https://github.com/jasync-sql/jasync-sql
• SAP HANA
• Google Cloud Spanner
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https://github.com/spring-projects/spring-data-r2dbc
• Spring Data R2DBC12݄ʹGA
• Spring Boot R2DBC Starter·ͩexperimentalʢૣͯ͘
Spring Boot 2.3ʹͳΔΑ͏Ͱ͢ʣ
• https://twitter.com/mp911de/status/
1202987229024522245?s=20
• https://github.com/spring-projects-experimental/spring-
boot-r2dbc
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4QSJOH%BUB3%#$
!5SBOTBDUJPOBM4QSJOH%BUB3FQPTJUPSZ
public class User {
@Id
private Integer id;
…
}
public interface UserRepository extends ReactiveCrudRepository {
}
@Service
@Transactional
public class UserService {
private final UserRepository userRepository;
public UserService(UserRepository userRepository) {
this.userRepository = userRepository;
}
public Flux findAll() {
return userRepository.findAll();
}
public Mono findById(int id) {
return userRepository.findById(id);
}
}
)ͷ߹
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@Service
public class UserService {
private final UserRepository userRepository;
private final TransactionalOperator transactionalOperator;
public UserService(UserRepository userRepository,
TransactionalOperator transactionOperator) {
this.userRepository = userRepository;
this.transactionalOperator = transactionOperator;
}
public Flux saveAll(String... names) {
return transactionalOperator.transactional(
Flux.fromArray(names)
.map(name -> new User(null, name))
.flatMap(reservationRepository::save));
}
}
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4QSJOH%BUB3%#$
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@Component
public class UserRepository {
private final DatabaseClient client;
public UserRepository(DatabaseClient client) {
this.client = client;
}
public Flux findAll() {
return client.select().from(User.class).fetch().all();
}
public Mono findById(Integer id) {
return client.select().from(User.class).matching(where("id").is(id)).fetch().one();
}
public Mono insert(User user) {
return client.insert().into(User.class).using(user).then();
}
public Mono update(User user) {
return client.update().table(User.class).using(user).then();
}
public Mono deleteById(Integer id) {
return client.delete().from(User.class).matching(where("id").is(id)).then();
}
}
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34PDLFU
http://rsocket.io/
• Application protocol providing Reactive Streams
semantics
• RSocket is a binary protocol for use on byte stream
transports such as TCP, WebSockets, and Aeron(UDP).
• marking͞Μͷࢿྉ͕ຊޠͰॻ͔Ε͍͔ͯͯΓ͍͢
Ͱ͢
• https://docs.google.com/presentation/d/1ygSM85-
RQ3NZjCg6RaZ52mGzxbWiItVwzlCpr1vaWBw/
edit#slide=id.g75f375afa0_0_0
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34PDLFU
• Duplex
• Server͕requesterʹͳΕΔʢServer͕σʔλΛૹ৴ͨ͠ΓϨεϙϯεΛड৴Ͱ͖Δʣ
• Reactive Streams
• JVM͚ͩͰͳ͘ɺωοτϫʔΫ্ͰReactive StreamΛ࣮Ͱ͖Δ
• Back Pressure
• Session/Stream resumption (Session/Streamͷ࠶։)
• ࠶ଓޙʹSession͕࠶։͢Δ
• Back pressurestream͝ͱ
• Leasing
• ϦΫΤετͷεϩοτϦϯά
• Fragmentation And Reassembly
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• Request Response (stream of 1)
• Request Stream (finite stream of many)
• Request Channel (bi-directional streams)
• Request Fire-and-Forget (no response)
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send one / receive one
3&26&45
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send one / receive many
3&26&45
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1":-0"%
1":-0"%
1":-0"%
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send many / receive many
3&26&45
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1":-0"%
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1":-0"%
1":-0"% 1":-0"%
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send one
3&26&45
'/'
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H31$
gRPCʹࣅͨΑ͏ͳ4छྨͷαʔϏεϝιου͕͋Δ
• Unary RPC (send one / receive one)
• Server streaming RPC (send one / receive many)
• Client streaming RPC (send many / receive one)
• Bidirectional streaming RPC (send many / receive many)
https://grpc.io/docs/guides/concepts/
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H31$ͱ34PDLFUͷҧ͍
https://medium.com/netifi/differences-between-grpc-and-
rsocket-e736c954e60
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34PDLFU4QSJOH#PPU
• Spring BootͰTransport ProtocolʹTCPͱWebSocketΛ
αϙʔτ͍ͯ͠Δ
https://docs.spring.io/spring/docs/current/spring-framework-
reference/pdf/rsocket.pdf
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3FRVFTU3FTQPOTF
public class HelloRequest {
private String name;
}
public class HelloResponse {
private String message;
private LocalDateTime dateTime;
}
@Bean
public RSocketRequester rSocketRequester(RSocketRequester.Builder builder) {
return builder.connectTcp("localhost", 7000).block();
}
public Mono requestResponse(String name) {
return rSocketRequester.route("requestResponse")
.data(new HelloRequest(name))
.retrieveMono(HelloResponse.class);
}
@MessageMapping("requestResponse")
public Mono requestResponse(HelloRequest request) {
return Mono.just(new HelloResponse(String.format("Hello %s!", request.getName()),
LocalDateTime.now()));
}
3FRVFTUFS
3FTQPOEFS
4FOEPOF3FDFJWFPOF
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3FRVFTU4USFBN
public Flux requestStream(String name) {
return rSocketRequester.route("requestStream")
.data(new HelloRequest(name))
.retrieveFlux(HelloResponse.class);
}
@MessageMapping("requestStream")
public Flux requestStream(HelloRequest request) {
Stream responses =
Stream.generate(() -> new HelloResponse("Hello " + request.getName() + "!"),
LocalDateTime.now()));
return Flux.fromStream(responses);
}
3FRVFTUFS
3FTQPOEFS
4FOEPOF3FDFJWFNBOZ
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3FRVFTU$IBOOFM
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3FRVFTU$IBOOFM
public Flux requestChannel(String name) {
Flux requests =
Flux.fromStream(Stream.generate(() -> new HelloRequest(name)));
return rSocketRequester.route("requestChannel")
.data(requests)
.retrieveFlux(HelloResponse.class);
}
@MessageMapping("requestChannel")
public Flux requestChannel(Flux requests) {
return Flux.from(requests)
.map(request -> new HelloResponse("Hello " + request.getName() + "!"),
LocalDateTime.now()));
}
3FRVFTUFS
3FTQPOEFS
4FOENBOZ3FDFJWFNBOZ
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3FRVFTU'JSFBOE'PSHFU
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3FRVFTU'JSFBOE'PSHFU
public Mono fireAndForget(String name) {
return rSocketRequester.route("fireAndForget")
.data(new HelloRequest(name))
.send();
}
@MessageMapping("fireAndForget")
public Mono fireAndForget(HelloRequest request) {
return Mono.empty();
}
3FRVFTUFS
3FTQPOEFS
4FOEPOF
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34PDLFU 8FC4PDLFU
REQUEST RESPONSE 5SBOTQPSUʹ8FC4PDLFUΛͬͨ߹
8FC4PDLFUͷ1BZMPBE͕34PDLFUϑϨʔϜ
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5BMLT
• Reactive Revolution
• Deepdive into Reactive Spring with Coroutines and Kotlin
Flow
• Bootiful Kotlin
• Bootiful Testing
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3FBDUJWF3FWPMVUJPO
https://devoxx.be/talk/?id=25802
• 3࣌ؒͷDeep Dive
• SpringͷReactiveϓϩάϥϛϯάʹ͍ͭͯͷϥΠϒίʔσΟϯά
• YouTube
• https://www.youtube.com/watch?v=4-vEW8Ck_6g
• Sample Code
• https://github.com/joshlong/reactive-revolution
• https://github.com/joshlong/reactive-spring-livelessons-2e
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3FBDUJWF3FWPMVUJPO
ηογϣϯͷ༰
• Java + Spring Boot 2.2 + Spring Data Reactive MongoDB
• Java + Spring Boot 2.2 + Spring Data R2DBC
• Java + Spring Boot 2.2 + WebFlux + WebSocket
• Kotlin + Spring Boot 2.2 + Spring Cloud Gateway
• Kotlin + Spring Boot 2.2 + Spring Cloud Gateway + Spring Security + Spring
Data Reactive Redis(Redis Rate Limiter)
• Kotlin + Spring Boot 2.2 + WebFlux.fn + WebClient
• Kotlin + Spring Boot 2.2 + RSocket
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4QSJOH%BUB3FBDUJWF
.POHP%#
• Spring InitializrͰҎԼΛબ
• Dependencies
• Spring Data Reactive MongoDB
• Lombok
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4QSJOH%BUB3FBDUJWF
.POHP%#
@Document
@Data
@AllArgsConstructor
public class Reservation {
@Id
private String id;
private String name;
}
public interface ReservationRepository extends ReactiveCrudRepository {
}
@Component
@RequiredArgsConstructor
@Slf4j
public class DataInitializer {
private final ReservationRepository reservationRepository;
@EventListener(ApplicationReadyEvent.class)
public void ready() {
Flux saved = Flux.just("AAA", "BBB", "CCC")
.map(name -> new Reservation(null, name))
.flatMap(reservationRepository::save);
reservationRepository.deleteAll()
.thenMany(saved)
.thenMany(reservationRepository.findAll())
.subscribe(reservation -> log.info("{}", reservation));
}
}
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4QSJOH%BUB3%#$
• Spring InitializrͰҎԼΛબ
• Spring Data R2DBC [Experimental]
• H2 Database
※ ͜ͷηογϣϯͰPostgreSQLΛ͍ͬͯ·͕ͨ͠ɺH2Ͱઆ໌͠·͢
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4QSJOH%BUB3%#$
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Reservation {
@Id
private Integer id;
private String name;
}
public interface ReservationRepository extends ReactiveCrudRepository {
}
@Service
@RequiredArgsConstructor
@Slf4j
public class ReservationService {
private final ReservationRepository reservationRepository;
private final TransactionalOperator transactionalOperator;
public Flux saveAll(String... names) {
return transactionalOperator.transactional(
Flux.fromArray(names)
.map(name -> new Reservation(null, name))
.flatMap(reservationRepository::save)
.doOnNext(r -> log.info("{}", r)));
}
}
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8FC'MVY8FC4PDLFU
• Spring InitializrͰҎԼΛબ
• Dependencies
• Spring Reactive Web
• Lombok
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8FC'MVY8FC4PDLFU
KBWB
@Data
@AllArgsConstructor
public class GreetingRequest {
private String name;
}
@Data
@AllArgsConstructor
public class GreetingResponse {
private String message;
}
@Service
public class GreetingService {
public Flux greet(GreetingRequest request) {
return Flux
.fromStream(Stream.generate(() -> new GreetingResponse(
String.format("%s @ %s", request.getName(), Instant.now()))))
.delayElements(Duration.ofSeconds(1));
}
}
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8FC'MVY8FC4PDLFU
KBWB
@Configuration
public class WebSocketConfig {
@Bean
public WebSocketHandler webSocketHandler(GreetingService greetingService) {
return session -> {
Flux messages =
session.receive()
.map(WebSocketMessage::getPayloadAsText)
.map(GreetingRequest::new)
.flatMap(greetingService::greet)
.map(GreetingResponse::getMessage)
.map(session::textMessage);
return session.send(messages);
};
}
@Bean
public SimpleUrlHandlerMapping simpleUrlHandlerMapping(WebSocketHandler
webSocketHandler) {
return new SimpleUrlHandlerMapping(Map.of("/ws/greetings", webSocketHandler), 1);
}
@Bean
public WebSocketHandlerAdapter webSocketHandlerAdapter() {
return new WebSocketHandlerAdapter();
}
}
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8FC'MVY8FC4PDLFU KT
window.addEventListener('load', () => {
const ws = new WebSocket('ws://localhost:8080/ws/greetings');
ws.addEventListener('open', () => {
ws.send('Devoxx Belgium')
});
ws.addEventListener('message', (msg) => {
console.log(msg.data)
})
});
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,PUMJO4QSJOH$MPVE
(BUFXBZ
• Spring InitializrͰҎԼΛબ
• Language
• Kotlin
• Dependencies
• Gateway
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,PUMJO4QSJOH$MPVE
(BUFXBZ
@SpringBootApplication
class Application {
@Bean
fun gateway(rlb: RouteLocatorBuilder) =
rlb.routes {
route {
path("/proxy") and host("*.spring.io")
filters {
setPath("/reservations")
addResponseHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN, "*")
}
uri("http://localhost:8080")
}
}
}
fun main(args: Array) {
runApplication(*args)
}
ҎԼΛ࣮ߦ͢ΔͱɺIUUQMPDBMIPTUSFTFSWBUJPOTʹసૹ͞ΕΔ
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TFSWFSQPSU
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,PUMJO4QSJOH$MPVE(BUFXBZ
4QSJOH4FDVSJUZ3FEJT3BUF-JNJUFS
• Spring InitializrͰҎԼΛબ
• Language
• Kotlin
• Dependencies
• Gateway
• Spring Security
• Spring Data Reactive Redis
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,PUMJO4QSJOH$MPVE(BUFXBZ
4QSJOH4FDVSJUZ3FEJT3BUF-JNJUFS
@Bean
fun authorization(http: ServerHttpSecurity) =
http.httpBasic(Customizer.withDefaults())
.csrf { it.disable() }
.authorizeExchange {
it.pathMatchers("/proxy").authenticated()
.anyExchange().permitAll()
}
.build()
@Bean
fun authentication(passwordEncoder: PasswordEncoder) =
MapReactiveUserDetailsService(
User.withUsername("user1")
.password(passwordEncoder.encode("pass1"))
.roles("USER", "ADMIN")
.build())
@Bean
fun passwordEncoder() = BCryptPasswordEncoder()
σϞ༻ͷϢʔβʔΛՃ
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,PUMJO4QSJOH$MPVE(BUFXBZ
4QSJOH4FDVSJUZ3FEJT3BUF-JNJUFS
@Bean
fun redisRateLimiter() = RedisRateLimiter(5, 7)
@Bean
fun gateway(rlb: RouteLocatorBuilder, redisRateLimiter: RedisRateLimiter) =
rlb.routes {
route {
path("/proxy") and host("*.spring.io")
filters {
setPath("/reservations")
addResponseHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN, "*")
requestRateLimiter {
it.rateLimiter = redisRateLimiter
}
}
uri("http://localhost:8080")
}
}
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,PUMJO4QSJOH$MPVE(BUFXBZ
4QSJOH4FDVSJUZ3FEJT3BUF-JNJUFS
fun main(args: Array) {
runApplication(*args) {
val context = beans {
bean {
RedisRateLimiter(5, 7)
}
}
addInitializers(context)
}
}
,PUMJOͷ߹ɺCFBO,PUMJO%4-Λͬͯ͜ͷΑ͏ʹॻ͘͜
ͱͰ͖·͢
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,PUMJO8FC'MVYGO
8FC$MJFOU
• Spring InitializrͰҎԼΛબ
• Language
• Kotlin
• Dependencies
• Spring Reactive Web
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,PUMJO8FC'MVYGO
8FC$MJFOU
data class Reservation(val id: Int, val name: String)
@Bean
fun webClient(builder: WebClient.Builder) = builder.build()
@Bean
fun route(webClient: WebClient) =
router {
GET("/reservations/names") {
val reservations =
webClient.get()
.uri("http://localhost:8080/reservations")
.retrieve()
.bodyToFlux()
.map { it.name }
.retryBackoff(10, Duration.ofSeconds(1))
ServerResponse.ok().body(reservations)
}
}
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,PUMJO34PDLFU
• Spring InitializrͰҎԼΛબ
• Language
• Kotlin
• Dependencies
• RSocket
• Spring Reactive Web
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,PUMJO34PDLFU DMJFOU
data class GreetingRequest(val name: String)
data class GreetingResponse(val message: String)
@SpringBootApplication
class Application {
@Bean
fun rSocketClient(rSocketRequester: RSocketRequester.Builder) =
rSocketRequester.connectTcp("localhost", 7777).block()
@Bean
fun route(rSocketClient: RSocketRequester) =
router {
GET("/greetings/{name}") {
val request = GreetingRequest(it.pathVariable("name"))
val greetings: Flux = rSocketClient.route("greetings")
.data(request)
.retrieveFlux()
ServerResponse.ok()
.contentType(MediaType.TEXT_EVENT_STREAM)
.body(greetings)
}
}
} 3FRVFTU4USFBN
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,PUMJO34PDLFU TFSWFS
data class GreetingRequest(val name: String)
data class GreetingResponse(val message: String)
@Controller
class RSocketController {
@MessageMapping("greetings")
fun greet(request: GreetingRequest): Flux {
return Flux.fromStream(Stream.generate { GreetingResponse("${request.name} @ $
{Instant.now()}") })
.delayElements(Duration.ofSeconds(1))
}
}
TQSJOHSTPDLFUTFSWFSQPSU
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5BMLT
• Reactive Revolution
• Deepdive into Reactive Spring with Coroutines and Kotlin
Flow
• Bootiful Kotlin
• Bootiful Testing
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%FFQEJWFJOUP3FBDUJWF4QSJOH
XJUI$PSPVUJOFTBOE,PUMJO'MPX
https://devoxx.be/talk/?id=40958
• 3࣌ؒͷDeep Diveʢ࣮ࡍ2࣌ؒ͘Β͍Ͱͨ͠ʣ
• Kotlin + Reactive Springͷηογϣϯ
• YouTube
• https://www.youtube.com/watch?v=BoidEr_ZCGc
• Sample Code
• https://github.com/sdeleuze/spring-messenger
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,PUMJO!$POpHVSBUJPO1SPQFSUJFT
4QSJOH#PPU·Ͱ
@ConfigurationProperties("example.kotlin")
class KotlinExampleProperties {
lateinit var name: String
lateinit var description: String
val myService = MyService()
class MyService {
lateinit var apiToken: String
lateinit var uri: URI
}
}
example:
kotlin:
name: xxxxx
description: xxxxx
my-service:
api-token: xxxxx
uri: xxxxx
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,PUMJO!$POpHVSBUJPO1SPQFSUJFT
4QSJOH#PPU
@ConfigurationPropertiesScan
// or @EnableConfigurationProperties(KotlinExampleProperties::class)
class Application
@ConstructorBinding
@ConfigurationProperties("example.kotlin")
data class KotlinExampleProperties(val name: String,
val description: String,
val myService: MyService) {
data class MyService(val apiToken: String, val uri: URI)
}
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,PUMJO8FC.WDGO
@SpringBootApplication
class Application {
@Bean
fun routes() = router {
GET("/hello", ::hello)
}
fun hello(request: ServerRequest) =
ServerResponse.ok().body("Hello world!")
}
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,PUMJO8FC.WDGO
data class User(val id: Int, val name: String)
@SpringBootApplication
class Application {
@Bean
fun routes(handler: UserHandler) = router {
accept(MediaType.APPLICATION_JSON).nest {
GET("/users", handler::findAll)
GET("/users/{id}", handler::findById)
}
}
}
@Component
class UserHandler(private val userRepository: UserRepository) {
fun findAll(request: ServerRequest): ServerResponse =
ok().body(userRepository.findAll())
fun findById(request: ServerRequest): ServerResponse {
val id = request.pathVariable("id").toInt()
return ok().body(userRepository.findById(id))
}
}
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$PSPVUJOFT
• CoroutinesͱϓϩάϥϛϯάͷߏͷҰछ
• Subroutines͕ΤϯτϦʔ͔ΒϦλʔϯ·ͰΛҰͭͷॲཧ୯Ґͱ
͢Δͷʹର͠ɺCoroutines͍ͬͨΜॲཧΛதஅʢsuspendʣ͠
ͨޙɺଓ͖͔ΒॲཧΛ࠶։ʢresumeʣͰ͖Δ
• Coroutineͱ͍͏໊শɺMelvin Conwayͷ1963ͷจ͕ىݯ
https://en.wikipedia.org/wiki/Coroutine
https://ja.wikipedia.org/wiki/ίϧʔνϯ
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$PSPVUJOFT
• Kotlinͷ߹ɺJetBrainsʹΑͬͯfirst-party libraryͱͯ͠
kotlinx.coroutinesʹ࣮͞Ε͍ͯΔ
• KotlinͰɺlight-weight threadsͱఆٛ͞Ε͍ͯΔ
https://kotlinlang.org/docs/reference/coroutines-
overview.html
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$PSPVUJOFT
• Coroutineʹ͍ͭͯɺผͷηογϣϯʮCoroutines for Java
Developersʯ͕͔Γ͍͢Ͱ͢
• YouTube
• https://www.youtube.com/watch?v=wBpKAv4i8Ug
• Slide
• https://docs.google.com/presentation/d/
192JLr64isB5WCmeqo4Fvf3snsDLWxrfkZ7A2nsNxb84/
edit#slide=id.p
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5ISFBET$PSPVUJOFT
• Threads
• Context Switch
• OS decision
• Coroutines
• Suspend & Resume
• Coroutine Decision
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$POUFYU4XJUDI4VTQFOE
• Context Switch
• Save CPU state: stack, registers, EIP
• Done by OS, no control
• Suspend of a coroutine
• Saves the function state, stack
• Done by the code, 100% control
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NBJOCVJMEJOHCMPDLT
• Suspending Functions
• Structured concurrency
• Flow
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4VTQFOEJOHGVODUJPOT
fun main() = runBlocking {
launch { doWorld() }
println("Hello,")
}
suspend fun doWorld() {
delay(1000L)
println("World!")
}
• ؔʹsuspendम০ࢠΛ͚Δ
• Suspending functionɺcoroutineͰ௨ৗͷؔͷΑ͏ʹ༻͞ΕΔ
• Suspending functionɺdelayͷΑ͏ͳଞͷsuspending functionΛॱ൪ʹ༻Ͱ͖Δ
https://kotlinlang.org/docs/reference/coroutines/basics.html#extract-function-refactoring
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(MPCBM4DPQF
• ͜ͷྫͰɺGlobalScopeʹ৽͍͠coroutineΛىಈ͍ͯ͠Δ
• ͜ͷcoroutineͷlifetimeɺΞϓϦέʔγϣϯશମͷlifetimeʹΑͬͯͷΈ੍ݶ͞ΕΔ
• https://kotlinlang.org/docs/reference/coroutines/basics.html#your-first-coroutine
fun main() {
GlobalScope.launch {
delay(1000L)
println("World!")
}
println("Hello,")
Thread.sleep(2000L)
}
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4USVDUVSFEDPODVSSFODZ
fun main() = runBlocking { // this: CoroutineScope
launch { // launch a new coroutine in the scope of runBlocking
delay(1000L)
println("World!")
}
println("Hello,")
}
• ࣮ߦ͢ΔΦϖϨʔγϣϯͷಛఆͷείʔϓͰcoroutinesΛىಈͰ͖ΔʢGlobalScopeͰىಈ͠ͳ͍ʣ
• ্هͷྫͰɺmainؔrunBlocking coroutine builderΛ༻ͯ͠coroutineʹม͞ΕΔ
• શͯͷcoroutine builderʢrunBlocking, launchͳͲʣɺͦͷbuilderͷίʔυϒϩοΫͷείʔϓʹ
CoroutineScopeͷΠϯελϯεΛՃ͢Δ
• ֎ଆͷcoroutineʢ͜ͷྫͰrunBlockingʣɺείʔϓͰىಈ͞Εͨશͯͷcoroutines͕ྃ͢Δ·Ͱྃ
͠ͳ͍
https://kotlinlang.org/docs/reference/coroutines/basics.html#structured-concurrency
ग़ྗ݁Ռ
)FMMP
8PSME
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'MPX5
• Suspending functions୯ҰͷΛඇಉظʹฦ͕͢ɺFlowෳͷΛඇಉظʹฦ͢
• flow builderϒϩοΫͰαεϖϯυͰ͖Δ
• FlowΛฦؔ͢ʹsuspendम০ࢠΛ͚ͳ͍
• Flowcold streamsͰɺFlow͕collect͞ΕΔ·Ͱflow builderͷίʔυ࣮ߦ͞Εͳ͍
• FlowReactive Streamsͱ૬ޓӡ༻࡞༻ͯ͠ɺbackpressueΛαϙʔτ͢Δ
https://kotlinlang.org/docs/reference/coroutines/flow.html
fun foo(): Flow = flow { // flow builder
for (i in 1..3) {
delay(100) // pretend we are doing something useful here
emit(i) // emit next value
}
}
fun main() = runBlocking {
// Collect the flow
foo().collect { value -> println(value) }
}
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4QSJOH$PSPVUJOFT
• Coroutines allows to consume Spring Reactive stack with
a nice balance between imperative and declarative style
• Context interoperability between Coroutines and Reactor
• Allows to support Reactive transactions and security
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4QSJOHQSPWJEFTP⒏DJBM
$PSPVUJOFTTVQQPSU
• Spring WebFlux
• Spring Data Redis
• Spring Data MongoDB
• Spring Data Cassandra
• Spring Data R2DBC
• Spring Vault
• RSocket
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4UBUVTPG$PSPVUJOFT
TVQQPSU
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)PX3FBDUPS"1*T
USBOTMBUFUP$PSPVUJOFT
fun handler(): Mono → suspend fun handler()
fun handler(): Mono → suspend fun handler(): T
fun handler(): Flux → suspend fun handler(): Flow
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$PSPVUJOFT8FC'MVY
data class User(val id: Int, val message: String)
@RestController
class UserController {
@GetMapping("/users")
suspend fun findAll(): Flow {
delay(1000)
return flowOf(User(1, "name1"), User(2, "name2"), User(3, "name3"))
}
@GetMapping("/users/{id}")
suspend fun findOne(@PathVariable id: Int): User {
delay(1000)
return User(id, "name$id")
}
}
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$PSPVUJOFT8FC'MVYGO
data class User(val id: Int, val message: String)
@SpringBootApplication
class Application {
@Bean
fun routes() = coRouter {
"/users".nest {
GET("/", ::findAll)
GET("/{id}", ::findOne)
}
}
suspend fun findAll(request: ServerRequest): ServerResponse {
delay(1000)
val users: Flow = (1..5).map { User(it, "name$it") }.asFlow()
return ok().bodyAndAwait(users)
}
suspend fun findOne(request: ServerRequest): ServerResponse {
delay(1000)
val id = request.pathVariable("id").toInt()
return ok().bodyValueAndAwait(User(id, "name$id"))
}
}
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$PSPVUJOFT8FC$MJFOU
@RestController
class UserController(private val webClient: WebClient) {
@GetMapping("/users")
suspend fun findAll(): Flow =
webClient.get()
.uri("/users")
.accept(MediaType.APPLICATION_JSON)
.retrieve()
.bodyToFlow()
@GetMapping("/users/{id}")
suspend fun findOne(@PathVariable id: Int): User =
webClient.get()
.uri("/users/{id}", id)
.accept(MediaType.APPLICATION_JSON)
.retrieve()
.awaitBody()
}
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$PSPVUJOFT34PDLFU
@Bean
fun route(requester: RSocketRequester) =
coRouter {
GET("/greetings/{name}") {
val request = GreetingRequest(it.pathVariable("name"))
val greetings: Flow = requester.route("greetings")
.data(request)
.retrieveFlow()
.map { response -> response.message }
ok().sse().bodyAndAwait(greetings)
}
}
@Controller
class RSocketController {
@MessageMapping("greetings")
fun greet(request: GreetingRequest) = flow {
while (true) {
emit(GreetingResponse("${request.name} @ ${Instant.now()}"))
delay(1000)
}
}
}
4QSJOH#PPUͰόά͕͋ΔͷͰSFUSJFWF'MPX͑ͳ͍Ͱ͢
IUUQTHJUIVCDPNTQSJOHQSPKFDUTTQSJOHGSBNFXPSLJTTVFT
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$PSPVUJOFT4QSJOH%BUB3%#$
'VODUJPOBM5SBOTBDUJPOT
@SpringBootApplication
class Application(private val operator: TransactionalOperator,
private val repository: UserRepository) {
@EventListener(ApplicationReadyEvent::class)
fun readyEvent() = runBlocking {
operator.executeAndAwait {
repository.insert(User(1, "name1"))
repository.insert(User(2, "name2"))
repository.insert(User(3, "name3"))
}
}
}
!5SBOTBDUJPOBMݱ࣌Ͱະαϙʔτ
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$PSPVUJOFT4QSJOH%BUB3%#$
3FBDUJWF"1*T
data class User(@field:Id val id: Int, val name: String)
@Component
class UserRepository(private val client: DatabaseClient) {
fun findAll(): Flow =
client.select().from().orderBy(asc("id")).fetch().flow()
suspend fun findOne(id: Int) =
client.select().from().matching(where("id").`is`(id)).fetch().awaitOneOrNull()
suspend fun insert(user: User) =
client.insert().into().using(user).await()
suspend fun insertUntyped(name: String) =
client.insert().into("user").value("name", name).await()
suspend fun update(user: User) =
client.update().table().using(user).then().awaitFirstOrNull()
suspend fun delete(id: Int) =
client.delete().from().matching(where("id").`is`(id)).then().awaitFirstOrNull()
}
4QSJOH%BUB3FQPTJUPSJFTݱ࣌Ͱະαϙʔτ
IUUQTKJSBTQSJOHJPCSPXTF%"5"$./4
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$PSPVUJOFT4QSJOH%BUB.POHP%#
3FBDUJWF"1*T
@Component
class UserRepository(private val operations: ReactiveFluentMongoOperations) {
fun findAll(): Flow = operations.query().flow()
suspend fun findOne(id: String): User =
operations.query()
.matching(query(where(User::id).isEqualTo(id)))
.awaitOne()
suspend fun insert(user: User): User =
operations.insert().oneAndAwait(user)
suspend fun update(user: User): User =
operations.update()
.replaceWith(user)
.asType()
.findReplaceAndAwait()
}
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4QSJOH'V
https://github.com/spring-projects-experimental/spring-fu
• Spring BootͷઃఆΛSpring Kotlin DSLͰߦ͑Δ
• ىಈ͕ૣͯ͘ϝϞϦফඅྔ͕গͳ͍
• Experimental
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4QSJOH'V
val app = application(WebApplicationType.REACTIVE) {
logging {
level = LogLevel.INFO
}
beans {
bean()
bean()
}
webFlux {
port = if (profiles.contains("test")) 8181 else 8080
router {
val userHandler = ref()
GET("/users", userHandler::findAll)
}
codecs {
string()
jackson()
}
}
}
fun main() {
app.run()
}
data class User(val id: Int, val name: String)
@Suppress("UNUSED_PARAMETER")
class UserHandler(private val repository: UserRepository) {
fun findAll(request: ServerRequest): Mono =
ok().body(fromValue(repository.findAll()))
}
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4QSJOH'V $PSPVUJOFT
val app = application(WebApplicationType.REACTIVE) {
logging {
level = LogLevel.INFO
}
beans {
bean()
bean()
}
webFlux {
port = if (profiles.contains("test")) 8181 else 8080
coRouter {
val userHandler = ref()
GET("/users", userHandler::findAll)
}
codecs {
string()
jackson()
}
}
}
fun main() {
app.run()
}
data class User(val id: Int, val name: String)
@Suppress("UNUSED_PARAMETER")
class UserHandler(private val repository: UserRepository) {
suspend fun findAll(request: ServerRequest): ServerResponse =
ok().bodyAndAwait(repository.findAll())
}
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5BMLT
• Reactive Revolution
• Deepdive into Reactive Spring with Coroutines and Kotlin
Flow
• Bootiful Kotlin
• Bootiful Testing
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#PPUJGVM,PUMJO
https://devoxx.be/talk/?id=128352
• 50ͷηογϣϯ
• Kotlin + Spring BootͷϥΠϒίʔσΟϯά
• YouTube
• https://www.youtube.com/watch?v=etwrkcqIMnk
• Sample Code
• https://github.com/joshlong/kotlin-and-spring-livelessons
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#PPUJGVM,PUMJO
1. Kotlin + Spring Boot 2.2 + Spring JDBC
2. Kotlin + Spring Boot 2.2 + Exposed
3. Kotlin + Spring Boot 2.2 + Spring Data Reactive
MongoDB + Spring Gateway + Coroutines
※ 3લड़ͷηογϣϯͱࣅ͍ͯΔͨΊׂѪ͠·͢
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,PUMJO4QSJOH+%#$
• Spring InitializrͰҎԼΛબ
• Language
• Kotlin
• Dependencies
• JDBC API
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,PUMJO4QSJOH+%#$
@SpringBootApplication
class Application
fun main(args: Array) {
runApplication(*args)
}
data class Customer(val id: Int, val name: String)
@Service
class CustomerService(private val jdbcTemplate: JdbcTemplate) {
fun findAll(): List =
jdbcTemplate.query("SELECT * FROM customer")
{ rs, _ -> Customer(rs.getInt("id"), rs.getString("name")) }
}
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4QSJOH#PPU&YQPTFE
https://github.com/JetBrains/Exposed
• KotlinͰॻ͔ΕͨJetBrainsͷܰྔͳSQLϥΠϒϥϦ
• ݱࡏMaven Centralʹͳ͘ɺBintray (JCenter)ͷΈ
• exposed-spring-boot-starter͕͋ΓɺҎԼͷػೳ͕ఏڙ͞Ε͍ͯΔ
• SpringTransactionManagerͷࣗಈઃఆ
• schemaͷࣗಈੜ
※ ͜ͷηογϣϯͰexposed-spring-boot-starter͍ͬͯ·ͤΜͰ͕ͨ͠ɺ
starterΛͬͨํ๏Λհ͠·͢
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&YQPTFE CVJMEHSBEMFLUT
repositories {
mavenCentral()
jcenter()
}
dependencies {
…
implementation(“org.jetbrains.exposed:exposed-spring-boot-starter:0.20.2")
…
}
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&YQPTFE LU
import org.jetbrains.exposed.sql.Table
object Customers : Table() {
val id = integer("id").autoIncrement()
val name = varchar("name", 255)
override val primaryKey = PrimaryKey(id)
}
data class Customer(val id: Int, val name: String)
TQSJOHFYQPTFEHFOFSBUFEEEMUSVFʹ͢ΕɺҎԼͷ%%-͕࣮ߦ͞ΕΔ
$3&"5&5"#-&*'/05&9*454
$6450.&34 *%*/5"650@*/$3&.&/513*."3:,&:
/".&7"3$)"3
/05/6--
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&YQPTFE LU
@Service
@Transactional
class CustomerService {
fun selectAll(): List =
Customers.selectAll().map { Customer(it[Customers.id], it[Customers.name]) }
fun insert(customer: Customer) =
Customers.insert {
it[name] = customer.name
}
fun update(customer: Customer) =
Customers.update({ Customers.id eq customer.id }) {
it[name] = customer.name
}
fun delete(id: Int) = Customers.deleteWhere { Customers.id eq id }
}
4QSJOHͷ!5SBOTBDUJPOBM͕༻Ͱ͖Δ
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5BMLT
• Reactive Revolution
• Deepdive into Reactive Spring with Coroutines and Kotlin
Flow
• Bootiful Kotlin
• Bootiful Testing
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#PPUJGVM5FTUJOH
https://devoxx.be/talk/?id=25801
• 50ͷηογϣϯ
• Spring Bootͷςετʹ͍ͭͯͷϥΠϒίʔσΟϯά
• YouTube
• https://www.youtube.com/watch?v=wAYt4Z4SF7g
• Sample Code
• https://github.com/joshlong/bootiful-testing
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#PPUJGVM5FTUJOH
1. Spring Boot 2.2 + WebFlux + Spring Data Reactive
MongoDB
2. Spring Boot 2.2 + WebClient + WireMock (Contract Stub
Runner)
3. Spring Boot 2.2 + WebFlux,WebClient + Spring Cloud
Contract (Contract Verifier, Contract Stub Runner)
※ ͜ͷηογϣϯͰJUnit 4Λ͍ͬͯ·͕ͨ͠ɺJUnit 5Ͱઆ໌͠·͢
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8FC'MVY5FTU
@WebFluxTest
public class ControllerTest {
@Autowired
private WebTestClient webTestClient;
@Test
public void test() {
webTestClient.get()
.uri("http://localhost:8080/reservations")
.exchange()
.expectHeader().contentType(MediaType.APPLICATION_JSON)
.expectStatus().isOk()
.expectBody().json("[{\"id\":1,\"name\":\"name1\"},...]");
}
}
ςετରͷ
FOEQPJOU
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3FBDUJWF.POHP%#5FTU
@DataMongoTest
public class ReservationRepositoryTest {
@Autowired
private ReservationRepository reservationRepository;
@Test
public void test() {
Reservation reservation = new Reservation(null, "name1");
StepVerifier.create(reservationRepository(reservation))
.expectNextMatches(result -> result.getId() != null
&& "name1".equals(result.getName()))
.verifyComplete();
}
}
ςετରͷ
SFQPTJUPSZ
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8FC$MJFOU5FTU 8JSF.PDL
http://wiremock.org/
• WebClientͷςετʹɺOkHttp MockWebServer
WireMockͳͲͷMock Web Server͕༻Ͱ͖Δ
• RestTemplateͷςετͰ༻Ͱ͖ΔMockRestServiceServer
ɺWebClientΛαϙʔτ͍ͯ͠ͳ͍
• https://docs.spring.io/spring-framework/docs/current/spring-
framework-reference/web-reactive.html#webflux-client-testing
• https://github.com/spring-projects/spring-framework/issues/
19852
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8FC$MJFOU5FTU 8JSF.PDL
•Spring InitializrͰҎԼΛબ
• Spring Reactive Web
• Contract Stub Runner
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8FC$MJFOU TPVSDFDPEF
@Component
public class GitHubApiClient {
private final WebClient webClient;
public GitHubApiClient(WebClient.Builder builder,
@Value("${github.baseUrl:https://api.github.com}") String baseUrl) {
webClient = builder.baseUrl(baseUrl).build();
}
public Mono getUser(String username) {
return webClient.get()
.uri("/users/{username}", username)
.retrieve()
.bodyToMono(User.class);
}
}
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8JSF.PDL UFTUDPEF
@SpringBootTest(properties = "github.baseUrl=http://localhost:8080")
@AutoConfigureWireMock(port = 8080)
public class GitHubApiClientTest {
@Autowired
private GitHubApiClient client;
@Test
public void getUserTest() {
String body = "{\"login\":\"hirakida\"}";
stubFor(get(urlEqualTo("/users/hirakida"))
.willReturn(aResponse()
.withBody(body)
.withHeader(HttpHeaders.CONTENT_TYPE,
MediaType.APPLICATION_JSON_VALUE)
.withStatus(HttpStatus.OK.value())));
Mono user = client.getUser("hirakida");
StepVerifier.create(user)
.expectNextMatches(result -> result != null
&& "hirakida".equals(result.getLogin()))
.verifyComplete();
}
}
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4QSJOH$MPVE$POUSBDU
https://spring.io/projects/spring-cloud-contract
• Consumer Driven Contract(CDC) Testing͕Ͱ͖Δ
• ProducerContract VerifierΛ͏
• ConsumerContract Stub RunnerΛ͏
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1SPEVDFS
•Spring InitializrͰҎԼΛબ
•Contract Verifier
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1SPEVDFS TPVSDFDPEF
@RestController
@RequiredArgsConstructor
public class UserController {
private final UserService userService;
@GetMapping("/users/{id}")
public Mono getUser(@PathVariable long id) {
return userService.getUser(id);
}
}
@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
private long id;
private String name;
}
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1SPEVDFS CVJMEHSBEMF
import org.springframework.cloud.contract.verifier.config.TestFramework
plugins {
id 'org.springframework.boot' version '2.2.2.RELEASE'
id 'org.springframework.cloud.contract' version '2.2.0.RELEASE'
}
dependencies {
…
testImplementation('org.springframework.boot:spring-boot-starter-test') {
exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
}
testImplementation 'org.springframework.cloud:spring-cloud-starter-contract-verifier'
}
contracts {
testFramework = TestFramework.JUNIT5
testMode = 'EXPLICIT'
baseClassForTests = 'com.example.BaseClass'
}
ޙड़͢Δ#BTF$MBTTͷQBUIΛࢦఆ
͢Δ
4QSJOH$MPVE$POUSBDU
(SBEMF1MVHJO
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1SPEVDFS
#BTF$MBTT'PS5FTUT
@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT, properties =
"server.port=0")
public class BaseClass {
@LocalServerPort
private int port;
@MockBean
private UserService userService;
@BeforeEach
public void setup() {
RestAssured.baseURI = "http://localhost";
RestAssured.port = port;
when(userService.getUser(1)).thenReturn(Mono.just(new User(1, "name1")));
}
}
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1SPEVDFS HSPPWZ
import org.springframework.cloud.contract.spec.Contract
Contract.make {
description('User API test')
request {
method "GET"
url "/users/1"
}
response {
status 200
headers {
contentType(applicationJson())
}
body """
{
"id": 1,
"name": "name1"
}
"""
}
}
͜ͷHSPPWZϑΝΠϧΛʮTSDUFTUSFTPVSDFTDPOUSBDUTʯʹஔ͘
CVJME͢ΔͱTUVCTKBS͕Ͱ͖ΔͷͰɺ͜ΕΛ
DPOTVNFSଆ͕༻͢Δ
$POTVNFSଆ͕ظ͢Δ݁Ռ
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$POTVNFS
•Spring InitializrͰҎԼΛબ
•Contract Stub Runner
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$POTVNFS TPVSDFDPEF
@Component
public class UserApiClient {
private final WebClient webClient;
public UserApiClient(WebClient.Builder builder,
@Value("${producer.host:localhost}") String host,
@Value("${producer.port:8080}") int port) {
webClient = builder.baseUrl("http://" + host + ':' + port).build();
}
public Mono getUser(long id) {
return webClient.get()
.uri("/users/{id}", id)
.retrieve()
.bodyToMono(User.class);
}
}
@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
private long id;
private String name;
}
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Slide 110
Slide 110 text
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@SpringBootTest(webEnvironment = WebEnvironment.NONE,
properties = "producer.port=${stubrunner.runningstubs.contract-producer.port}")
@AutoConfigureStubRunner(ids = "com.example:contract-producer:+", stubsMode =
StubsMode.LOCAL)
public class UserApiClientTest {
@Autowired
private UserApiClient client;
@Test
public void getUserTest() {
Mono response = client.getUser(1);
StepVerifier.create(response)
.expectNextMatches(result -> result != null
&& result.getId() == 1
&& "name1".equals(result.getName()))
.verifyComplete();
}
}
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