Merge pull request #4710 from veontomo/SpringReactiveKotlin

Code for the article "Spring Webflux with Kotlin"

pom.xml

@@ -545,6 +545,7 @@
 				<module>antlr</module>
 				<module>maven-archetype</module>
 				<module>apache-meecrowave</module>
+        <module>spring-reactive-kotlin</module>
 				<module>jnosql</module>
 			</modules>
 
@@ -734,6 +735,7 @@
 				<module>spring-rest-query-language</module>
 				<module>spring-rest</module>
 				<module>spring-rest-simple</module>
+        <module>spring-reactive-kotlin</module>
 
 
 				<!-- group 3.2 - Pass, 8 minutes, 1 failed test, 2,294 KB log -->

spring-reactive-kotlin/pom.xml

@@ -0,0 +1,93 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<groupId>com.baeldung</groupId>
+	<artifactId>springreactivekotlin</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<packaging>jar</packaging>
+
+	<name>springreactivekotlin</name>
+	<description>Demo project for Spring Boot</description>
+
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>2.0.3.RELEASE</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+		<java.version>1.8</java.version>
+		<kotlin.version>1.2.41</kotlin.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-webflux</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>com.fasterxml.jackson.module</groupId>
+			<artifactId>jackson-module-kotlin</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.jetbrains.kotlin</groupId>
+			<artifactId>kotlin-stdlib-jdk8</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.jetbrains.kotlin</groupId>
+			<artifactId>kotlin-reflect</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>io.projectreactor</groupId>
+			<artifactId>reactor-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<sourceDirectory>${project.basedir}/src/main/kotlin</sourceDirectory>
+		<testSourceDirectory>${project.basedir}/src/test/kotlin</testSourceDirectory>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+			<plugin>
+				<artifactId>kotlin-maven-plugin</artifactId>
+				<groupId>org.jetbrains.kotlin</groupId>
+				<configuration>
+					<args>
+						<arg>-Xjsr305=strict</arg>
+					</args>
+					<compilerPlugins>
+						<plugin>spring</plugin>
+					</compilerPlugins>
+				</configuration>
+				<dependencies>
+					<dependency>
+						<groupId>org.jetbrains.kotlin</groupId>
+						<artifactId>kotlin-maven-allopen</artifactId>
+						<version>${kotlin.version}</version>
+					</dependency>
+				</dependencies>
+			</plugin>
+		</plugins>
+	</build>
+
+
+</project>

spring-reactive-kotlin/src/main/kotlin/com/baeldung/springreactivekotlin/Application.kt

@@ -0,0 +1,11 @@
+package com.baeldung.springreactivekotlin
+
+import org.springframework.boot.SpringApplication
+import org.springframework.boot.autoconfigure.SpringBootApplication
+
+@SpringBootApplication
+class Application
+
+fun main(args: Array<String>) {
+    SpringApplication.run(Application::class.java, *args)
+}

spring-reactive-kotlin/src/main/kotlin/com/baeldung/springreactivekotlin/Controller.kt

@@ -0,0 +1,18 @@
+package com.baeldung.springreactivekotlin
+
+import org.springframework.http.MediaType
+import org.springframework.stereotype.Controller
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.ResponseBody
+import reactor.core.publisher.Flux
+
+@Controller
+class Controller {
+
+    @GetMapping(path = ["/numbers"], produces = [MediaType.APPLICATION_STREAM_JSON_VALUE])
+    @ResponseBody
+    fun getNumbers(): Flux<Int> {
+        return Flux.range(1, 100)
+    }
+
+}

spring-reactive-kotlin/src/main/kotlin/com/baeldung/springreactivekotlin/Device.kt

@@ -0,0 +1,5 @@
+package com.baeldung.springreactivekotlin
+
+class Device(val name: String, val reading: Double) {
+
+}

spring-reactive-kotlin/src/main/kotlin/com/baeldung/springreactivekotlin/HomeSensorsHandler.kt

@@ -0,0 +1,36 @@
+package com.baeldung.springreactivekotlin
+
+import org.springframework.stereotype.Component
+import org.springframework.web.reactive.function.BodyInserters.fromObject
+import org.springframework.web.reactive.function.server.ServerRequest
+import org.springframework.web.reactive.function.server.ServerResponse
+import reactor.core.publisher.Mono
+
+@Component
+class HomeSensorsHandler {
+
+    var data = mapOf("lamp" to arrayOf(0.7, 0.65, 0.67), "fridge" to arrayOf(12.0, 11.9, 12.5))
+
+    fun setLight(request: ServerRequest): Mono<ServerResponse> = ServerResponse.ok().build()
+
+    fun getLightReading(request: ServerRequest): Mono<ServerResponse> =
+            ServerResponse.ok().body(fromObject(data["lamp"]!!))
+
+    fun getDeviceReadings(request: ServerRequest): Mono<ServerResponse> {
+        val id = request.pathVariable("id")
+        return ServerResponse.ok().body(fromObject(Device(id, 1.0)))
+    }
+
+    fun getAllDevices(request: ServerRequest): Mono<ServerResponse> =
+            ServerResponse.ok().body(fromObject(arrayOf("lamp", "tv")))
+
+    fun getAllDeviceApi(request: ServerRequest): Mono<ServerResponse> =
+            ServerResponse.ok().body(fromObject(arrayListOf("kettle", "fridge")))
+
+    fun setDeviceReadingApi(request: ServerRequest): Mono<ServerResponse> {
+        return request.bodyToMono(Device::class.java).flatMap { it ->
+            ServerResponse.ok().body(fromObject(Device(it.name.toUpperCase(), it.reading)))
+        }
+    }
+
+}

spring-reactive-kotlin/src/main/kotlin/com/baeldung/springreactivekotlin/HomeSensorsRouters.kt

@@ -0,0 +1,32 @@
+package com.baeldung.springreactivekotlin
+
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+import org.springframework.http.MediaType.APPLICATION_JSON
+import org.springframework.http.MediaType.TEXT_HTML
+import org.springframework.web.reactive.function.server.router
+
+@Configuration
+class HomeSensorsRouters(private val handler: HomeSensorsHandler) {
+
+    @Bean
+    fun roomsRouter() = router {
+        (accept(TEXT_HTML) and "/room").nest {
+            GET("/light", handler::getLightReading)
+            POST("/light", handler::setLight)
+        }
+    }
+
+    @Bean
+    fun deviceRouter() = router {
+        accept(TEXT_HTML).nest {
+            (GET("/device/") or GET("/devices/")).invoke(handler::getAllDevices)
+            GET("/device/{id}", handler::getDeviceReadings)
+        }
+        (accept(APPLICATION_JSON) and "/api").nest {
+            (GET("/device/") or GET("/devices/")).invoke(handler::getAllDeviceApi)
+            POST("/device/", handler::setDeviceReadingApi)
+        }
+    }
+
+}

spring-reactive-kotlin/src/main/kotlin/com/baeldung/springreactivekotlin/Routes.kt

@@ -0,0 +1,16 @@
+package com.baeldung.springreactivekotlin
+
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+import org.springframework.web.reactive.function.server.ServerResponse
+import org.springframework.web.reactive.function.server.router
+
+import org.springframework.web.reactive.function.BodyInserters.fromObject
+
+@Configuration
+class SimpleRoute {
+    @Bean
+    fun route() = router {
+        GET("/route") { _ -> ServerResponse.ok().body(fromObject(arrayOf(1, 2, 3))) }
+    }
+}

spring-reactive-kotlin/src/test/kotlin/RoutesTest.kt

@@ -0,0 +1,35 @@
+package veontomo
+
+import com.baeldung.springreactivekotlin.SimpleRoute
+import org.junit.Before
+import org.junit.Test
+import org.springframework.test.web.reactive.server.WebTestClient
+
+class RoutesTest {
+
+    lateinit var client: WebTestClient
+
+    @Before
+    fun init() {
+        this.client = WebTestClient.bindToRouterFunction(SimpleRoute().route()).build()
+    }
+
+
+    @Test
+    fun whenRequestToRoute_thenStatusShouldBeOk() {
+        client.get()
+                .uri("/route")
+                .exchange()
+                .expectStatus().isOk
+    }
+
+
+    @Test
+    fun whenRequestToRoute_thenBodyShouldContainArray123() {
+        client.get()
+                .uri("/route")
+                .exchange()
+                .expectBody()
+                .json("[1, 2, 3]")
+    }
+}