Evaluation Article - Spring web-flux
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Swapan Pramanick
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spring-5-reactive-webflux/pom.xml
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60
spring-5-reactive-webflux/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.baeldung</groupId>
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<artifactId>spring-5-reactive-webflux</artifactId>
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<version>1.0-SNAPSHOT</version>
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<name>spring-5-reactive-webflux</name>
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<description>A simple spring-5-reactive-webflux.</description>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-boot-2</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<relativePath>../parent-boot-2</relativePath>
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</parent>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<java.version>1.8</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-webflux</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-websocket</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>io.projectreactor</groupId>
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<artifactId>reactor-test</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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<configuration>
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<mainClass>com.baeldung.reactive.Spring5ReactiveApplication</mainClass>
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<layout>JAR</layout>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>
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package com.baeldung.reactive;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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/**
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* A Spring 5 reactive application
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*
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*/
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@SpringBootApplication
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public class Spring5ReactiveApplication {
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public static void main(String[] args) {
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SpringApplication.run(Spring5ReactiveApplication.class, args);
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}
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}
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/**
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*
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*/
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package com.baeldung.reactive.client;
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import java.util.UUID;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.web.reactive.function.client.WebClient;
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import com.baeldung.reactive.model.CabLocation;
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/**
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* @author swpraman
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*
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*/
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public class CabLocationConsumer {
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private static final Logger logger = LoggerFactory.getLogger(CabLocationConsumer.class);
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/**
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* Main method to consume locations of a cab as a stream
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* @param args
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*/
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public static void main(String[] args) {
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// The id of the booked cab
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String cabId = UUID.randomUUID().toString();
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// URI of the API
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String uri = "http://localhost:8080/cab/location/" + cabId;
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// @formatter:off
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WebClient.create(uri)
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.get()
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.retrieve()
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.bodyToFlux(CabLocation.class)
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.subscribe(CabLocationConsumer::showLocation);
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//@formatter:on
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sleepIndefinitely();
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}
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/**
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* Helper method to print location of the cab as received from stream
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* @param location
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*/
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private static void showLocation(CabLocation location) {
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logger.debug("Current Location : {}", location);
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}
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/**
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* This method blocks the current thread indefinitely
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*/
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private static void sleepIndefinitely() {
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try {
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while (true) {
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Thread.sleep(10000);
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}
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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}
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}
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/**
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*
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*/
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package com.baeldung.reactive.controller;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.http.MediaType;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.PathVariable;
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import org.springframework.web.bind.annotation.RestController;
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import com.baeldung.reactive.model.CabLocation;
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import com.baeldung.reactive.service.CabService;
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import reactor.core.publisher.Flux;
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/**
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* @author swpraman
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*
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*/
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@RestController
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public class CabController {
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/**
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* Logger instance
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*/
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private static final Logger logger = LoggerFactory.getLogger(CabController.class);
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@Autowired
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private CabService cabService;
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// Server sends location of the cab at the interval of 1 sec
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@GetMapping(value = "cab/location/{cabId}", produces = MediaType.APPLICATION_STREAM_JSON_VALUE)
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public Flux<CabLocation> cabLocation(@PathVariable("cabId") String cabId) {
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logger.debug("Getting location stream for cabId: {}", cabId);
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return cabService.getLocation(cabId);
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}
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}
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/**
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*
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*/
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package com.baeldung.reactive.model;
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import java.io.Serializable;
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/**
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* @author swapanpramanick2004
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*
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*/
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public class CabLocation implements Serializable {
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/**
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* Serial version UID
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*/
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private static final long serialVersionUID = -3923503044822400093L;
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private String cabId;
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private double latititude;
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private double longitude;
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public String getCabId() {
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return cabId;
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}
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public void setCabId(String cabId) {
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this.cabId = cabId;
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}
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public double getLatititude() {
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return latititude;
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}
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public void setLatititude(double latititude) {
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this.latititude = latititude;
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}
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public double getLongitude() {
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return longitude;
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}
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public void setLongitude(double longitude) {
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this.longitude = longitude;
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}
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@Override
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public String toString() {
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return "CabLocation [cabId=" + cabId + ", latititude=" + latititude + ", longitude=" + longitude + "]";
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}
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}
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/**
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*
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*/
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package com.baeldung.reactive.service;
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import java.time.Duration;
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import java.util.Random;
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import java.util.stream.Stream;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.stereotype.Service;
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import com.baeldung.reactive.model.CabLocation;
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import reactor.core.publisher.Flux;
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import reactor.util.function.Tuple2;
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/**
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* @author swpraman
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*
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*/
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@Service
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public class CabService {
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/**
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* Logger instance
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*/
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private static final Logger logger = LoggerFactory.getLogger(CabService.class);
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/**
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* getLocation service for cab
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* @param cabId
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* @return
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*/
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public Flux<CabLocation> getLocation(String cabId) {
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// Create a flux to retrieve location
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Flux<CabLocation> locFlux = Flux.fromStream(Stream.generate(() -> retrieveNewLocation(cabId)));
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// Zip the flux with an interval flux
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return Flux.interval(Duration.ofSeconds(1))
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.zipWith(locFlux)
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.map(Tuple2::getT2);
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}
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/**
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* A random instance to create random location parameters
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*/
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private Random random = new Random();
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/**
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* A Dummy method to return random location.
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* In a real project it should retrieve the location from a database or any other data source.
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* @param cabId
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* @return
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*/
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private CabLocation retrieveNewLocation(String cabId) {
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logger.debug("Retrieveing location for cab: {}", cabId);
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CabLocation location = new CabLocation();
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location.setCabId(cabId);
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location.setLatititude(random.nextDouble());
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location.setLongitude(random.nextDouble());
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return location;
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}
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}
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15
spring-5-reactive-webflux/src/main/resources/logback.xml
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15
spring-5-reactive-webflux/src/main/resources/logback.xml
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<?xml version="1.0" encoding="UTF-8" ?>
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<configuration>
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<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
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<encoder>
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<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
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</encoder>
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</appender>
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<root level="INFO">
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<appender-ref ref="STDOUT"/>
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</root>
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<logger name="reactor" level="WARN"/>
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<logger name="com.baeldung.reactive" level="DEBUG"/>
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</configuration>
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26
spring-5-reactive-webflux/src/site/site.xml
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26
spring-5-reactive-webflux/src/site/site.xml
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<?xml version="1.0" encoding="UTF-8"?>
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<project name="spring-5-reactive-webflux" xmlns="http://maven.apache.org/DECORATION/1.8.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/DECORATION/1.8.0 http://maven.apache.org/xsd/decoration-1.8.0.xsd">
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<bannerLeft>
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<name>spring-5-reactive-webflux</name>
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<src>https://maven.apache.org/images/apache-maven-project.png</src>
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<href>https://www.apache.org/</href>
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</bannerLeft>
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<bannerRight>
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<src>https://maven.apache.org/images/maven-logo-black-on-white.png</src>
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<href>https://maven.apache.org/</href>
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</bannerRight>
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<skin>
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<groupId>org.apache.maven.skins</groupId>
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<artifactId>maven-fluido-skin</artifactId>
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<version>1.7</version>
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</skin>
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<body>
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<menu ref="parent" />
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<menu ref="reports" />
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</body>
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</project>
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package com.baeldung.reactive;
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import java.time.Duration;
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import java.util.UUID;
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import org.assertj.core.api.Assertions;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.boot.test.autoconfigure.web.reactive.WebFluxTest;
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import org.springframework.http.MediaType;
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import org.springframework.test.context.ContextConfiguration;
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import org.springframework.test.context.junit4.SpringRunner;
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import org.springframework.test.web.reactive.server.WebTestClient;
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import com.baeldung.reactive.controller.CabController;
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import com.baeldung.reactive.model.CabLocation;
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import com.baeldung.reactive.service.CabService;
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import reactor.core.publisher.Flux;
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import reactor.test.StepVerifier;
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/**
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* Unit test for testing Cab Locations
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*/
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@RunWith(SpringRunner.class)
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@ContextConfiguration(classes = { CabController.class, CabService.class })
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@WebFluxTest(controllers = { CabController.class })
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public class CapLocationTests {
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@Autowired
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private WebTestClient webClient;
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@Test
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public void whenGetAPIConsumed_thenShouldPrintTheLocationAtOneSecInterval() {
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// The id of the booked cab
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String cabId = UUID.randomUUID().toString();
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// URI of the API
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String uri = "http://localhost:8080/cab/location/" + cabId;
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// @formatter:off
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Flux<CabLocation> resultFlux = webClient.get()
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.uri(uri).accept(MediaType.APPLICATION_STREAM_JSON)
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.exchange()
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.returnResult(CabLocation.class)
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.getResponseBody();
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StepVerifier.create(resultFlux)
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.expectSubscription()
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.thenAwait(Duration.ofSeconds(1))
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.assertNext(location -> Assertions.assertThat(location)
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.hasFieldOrPropertyWithValue("cabId", cabId))
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.thenAwait(Duration.ofSeconds(1))
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.assertNext(location -> Assertions.assertThat(location)
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.hasFieldOrPropertyWithValue("cabId", cabId))
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.thenAwait(Duration.ofSeconds(1))
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.assertNext(location -> Assertions.assertThat(location)
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.hasFieldOrPropertyWithValue("cabId", cabId))
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.thenCancel()
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.verify();
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// @formatter:on
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}
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}
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