BAEL-3007: WebClient vs RestTemplate example.
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drazen
parent
01a447d6d3
commit
04e9fdafa4
3
pom.xml
3
pom.xml
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@ -606,6 +606,7 @@
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<module>spring-5-data-reactive</module>
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<module>spring-5-mvc</module>
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<module>spring-5-reactive</module>
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<module>spring-5-reactive-2</module>
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<module>spring-5-reactive-client</module>
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<module>spring-5-reactive-oauth</module>
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<module>spring-5-reactive-security</module>
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@ -820,6 +821,7 @@
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<module>spring-5</module>
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<module>spring-5-data-reactive</module>
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<module>spring-5-reactive</module>
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<module>spring-5-reactive-2</module>
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<module>spring-5-reactive-client</module>
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<module>spring-5-reactive-security</module>
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<module>spring-5-security</module>
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@ -1277,6 +1279,7 @@
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<module>spring-5-data-reactive</module>
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<module>spring-5-mvc</module>
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<module>spring-5-reactive</module>
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<module>spring-5-reactive-2</module>
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<module>spring-5-reactive-client</module>
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<module>spring-5-reactive-oauth</module>
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<module>spring-5-reactive-security</module>
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@ -0,0 +1,12 @@
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#folders#
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.idea
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/target
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/neoDb*
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/data
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/src/main/webapp/WEB-INF/classes
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*/META-INF/*
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# Packaged files #
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*.jar
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*.war
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*.ear
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@ -0,0 +1 @@
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## Spring 5 Reactive Project
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@ -0,0 +1,50 @@
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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" 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-2</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<name>spring-5-reactive-2</name>
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<packaging>jar</packaging>
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<description>spring 5 sample project about new features</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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<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-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<version>${lombok.version}</version>
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<scope>provided</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.webclient.WebClientApplication</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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@ -0,0 +1,13 @@
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package com.baeldung.webclient;
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import lombok.AllArgsConstructor;
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import lombok.Data;
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import lombok.NoArgsConstructor;
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@Data
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@NoArgsConstructor
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@AllArgsConstructor
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public class Tweet {
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private String text;
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private String username;
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}
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@ -0,0 +1,20 @@
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package com.baeldung.webclient;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.RestController;
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import java.util.Arrays;
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import java.util.List;
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@RestController
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public class TweetsSlowServiceController {
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@GetMapping("/slow-service-tweets")
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private List<Tweet> getAllTweets() throws Exception {
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Thread.sleep(2000L); // delay
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return Arrays.asList(
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new Tweet("RestTemplate rules", "@user1"),
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new Tweet("WebClient is better", "@user2"),
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new Tweet("OK, both are useful", "@user1"));
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}
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}
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@ -0,0 +1,11 @@
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package com.baeldung.webclient;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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@SpringBootApplication
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public class WebClientApplication {
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public static void main(String[] args) {
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SpringApplication.run(WebClientApplication.class, args);
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}
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}
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@ -0,0 +1,60 @@
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package com.baeldung.webclient;
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import lombok.Setter;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.core.ParameterizedTypeReference;
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import org.springframework.http.HttpMethod;
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import org.springframework.http.MediaType;
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import org.springframework.http.ResponseEntity;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.RestController;
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import org.springframework.web.client.RestTemplate;
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import org.springframework.web.reactive.function.client.WebClient;
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import reactor.core.publisher.Flux;
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import java.util.List;
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@Slf4j
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@RestController
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public class WebController {
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private static final int DEFAULT_PORT = 8080;
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@Setter
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private int serverPort = DEFAULT_PORT;
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@GetMapping("/tweets-blocking")
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public List<Tweet> getTweetsBlocking() {
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log.info("Starting BLOCKING Controller!");
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final String uri = getSlowServiceUri();
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RestTemplate restTemplate = new RestTemplate();
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ResponseEntity<List<Tweet>> response = restTemplate.exchange(
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uri, HttpMethod.GET, null,
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new ParameterizedTypeReference<List<Tweet>>(){});
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List<Tweet> result = response.getBody();
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result.forEach(tweet -> log.info(tweet.toString()));
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log.info("Exiting BLOCKING Controller!");
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return result;
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}
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@GetMapping(value = "/tweets-non-blocking", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
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public Flux<Tweet> getTweetsNonBlocking() {
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log.info("Starting NON-BLOCKING Controller!");
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Flux<Tweet> tweetFlux = WebClient.create()
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.get()
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.uri(getSlowServiceUri())
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.retrieve()
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.bodyToFlux(Tweet.class);
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tweetFlux.subscribe(tweet -> log.info(tweet.toString()));
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log.info("Exiting NON-BLOCKING Controller!");
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return tweetFlux;
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}
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private String getSlowServiceUri() {
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return "http://localhost:" + serverPort + "/slow-service-tweets";
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}
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}
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@ -0,0 +1,51 @@
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package com.baeldung.webclient;
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import org.junit.Before;
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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.context.SpringBootTest;
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import org.springframework.boot.web.server.LocalServerPort;
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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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@RunWith(SpringRunner.class)
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@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT, classes = WebClientApplication.class)
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public class WebControllerIntegrationTest {
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@LocalServerPort
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int randomServerPort;
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@Autowired
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private WebTestClient testClient;
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@Autowired
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private WebController webController;
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@Before
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public void setup() {
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webController.setServerPort(randomServerPort);
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}
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@Test
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public void whenEndpointWithBlockingClientIsCalled_thenThreeTweetsAreReceived() {
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testClient.get()
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.uri("/tweets-blocking")
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.exchange()
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.expectStatus()
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.isOk()
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.expectBodyList(Tweet.class)
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.hasSize(3);
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}
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@Test
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public void whenEndpointWithNonBlockingClientIsCalled_thenThreeTweetsAreReceived() {
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testClient.get()
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.uri("/tweets-non-blocking")
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.exchange()
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.expectStatus()
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.isOk()
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.expectBodyList(Tweet.class)
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.hasSize(3);
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}
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}
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