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Polish "Add Kafka sample"
Closes gh-11597
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@ -119,6 +119,9 @@ The following sample applications are provided:
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| link:spring-boot-sample-junit-jupiter[spring-boot-sample-junit-jupiter]
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| Demonstrates JUnit Jupiter-based testing
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| link:spring-boot-sample-kafka[spring-boot-sample-kafka]
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| consumer and producer using Apache Kafka
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| link:spring-boot-sample-liquibase[spring-boot-sample-liquibase]
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| Database migrations with Liquibase
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@ -230,6 +233,3 @@ The following sample applications are provided:
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| link:spring-boot-sample-xml[spring-boot-sample-xml]
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| Example show how Spring Boot can be mixed with traditional XML configuration (we
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generally recommend using Java `@Configuration` whenever possible
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| link:spring-boot-sample-kafka[spring-boot-sample-kafka]
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| consumer and producer using Apache Kafka
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@ -57,6 +57,7 @@
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<module>spring-boot-sample-jta-narayana</module>
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<module>spring-boot-sample-jta-jndi</module>
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<module>spring-boot-sample-junit-jupiter</module>
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<module>spring-boot-sample-kafka</module>
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<module>spring-boot-sample-liquibase</module>
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<module>spring-boot-sample-logback</module>
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<module>spring-boot-sample-oauth2-client</module>
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@ -97,7 +98,6 @@
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<module>spring-boot-sample-websocket-undertow</module>
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<module>spring-boot-sample-webservices</module>
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<module>spring-boot-sample-xml</module>
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<module>spring-boot-sample-kafka</module>
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</modules>
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<!-- No dependencies - otherwise the samples won't work if you change the
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parent -->
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@ -20,16 +20,12 @@
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<!-- Compile -->
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter</artifactId>
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<artifactId>spring-boot-starter-json</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.kafka</groupId>
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<artifactId>spring-kafka</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-json</artifactId>
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</dependency>
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<!-- Test -->
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<dependency>
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<groupId>org.springframework.boot</groupId>
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@ -39,6 +35,7 @@
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<dependency>
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<groupId>org.springframework.kafka</groupId>
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<artifactId>spring-kafka-test</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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@ -19,10 +19,11 @@ import org.springframework.kafka.annotation.KafkaListener;
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import org.springframework.stereotype.Component;
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@Component
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public class Consumer {
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class Consumer {
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@KafkaListener(topics = "myTopic")
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@KafkaListener(topics = "testTopic")
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public void processMessage(SampleMessage message) {
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System.out.println("consumer has received message : [" + message + "]");
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System.out.println("Received sample message [" + message + "]");
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}
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}
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@ -15,18 +15,21 @@
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*/
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package sample.kafka;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.kafka.core.KafkaTemplate;
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import org.springframework.stereotype.Component;
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@Component
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public class Producer {
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@Autowired
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private KafkaTemplate kafkaTemplate;
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private final KafkaTemplate<Object, SampleMessage> kafkaTemplate;
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Producer(KafkaTemplate<Object, SampleMessage> kafkaTemplate) {
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this.kafkaTemplate = kafkaTemplate;
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}
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public void send(SampleMessage message) {
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kafkaTemplate.send("myTopic", message);
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System.out.println("producer has sent message.");
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this.kafkaTemplate.send("testTopic", message);
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System.out.println("Sent sample message [" + message + "]");
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}
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}
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@ -15,8 +15,11 @@
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*/
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package sample.kafka;
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import org.springframework.boot.ApplicationRunner;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.boot.builder.SpringApplicationBuilder;
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import org.springframework.context.annotation.Bean;
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@SpringBootApplication
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public class SampleKafkaApplication {
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@ -24,4 +27,10 @@ public class SampleKafkaApplication {
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public static void main(String[] args) {
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SpringApplication.run(SampleKafkaApplication.class, args);
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}
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@Bean
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public ApplicationRunner runner(Producer producer) {
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return args -> producer.send(new SampleMessage(1, "A simple test message"));
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}
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}
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@ -15,39 +15,37 @@
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*/
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package sample.kafka;
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public class SampleMessage {
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private Integer id;
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private String message;
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import com.fasterxml.jackson.annotation.JsonCreator;
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import com.fasterxml.jackson.annotation.JsonProperty;
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public Integer getId() {
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return id;
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public class SampleMessage {
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private final Integer id;
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private final String message;
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@JsonCreator
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public SampleMessage(@JsonProperty("id") Integer id,
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@JsonProperty("message") String message) {
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this.id = id;
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this.message = message;
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}
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public void setId(Integer id) {
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this.id = id;
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public Integer getId() {
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return this.id;
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}
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public String getMessage() {
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return message;
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}
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public void setMessage(String message) {
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this.message = message;
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}
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public SampleMessage() {
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}
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public SampleMessage(Integer id, String message) {
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this.id = id;
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this.message = message;
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return this.message;
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}
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@Override
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public String toString() {
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return "SampleMessage{" +
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"id=" + id +
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", message='" + message + '\'' +
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'}';
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final StringBuilder sb = new StringBuilder("SampleMessage{");
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sb.append("id=").append(this.id);
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sb.append(", message='").append(this.message).append('\'');
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sb.append('}');
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return sb.toString();
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}
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}
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@ -1,5 +1,6 @@
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spring.kafka.bootstrap-servers=localhost:9092
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spring.kafka.consumer.group-id=myGroup
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spring.kafka.consumer.group-id=testGroup
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spring.kafka.consumer.auto-offset-reset=earliest
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spring.kafka.consumer.value-deserializer=org.springframework.kafka.support.serializer.JsonDeserializer
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spring.kafka.Producer.value-serializer=org.springframework.kafka.support.serializer.JsonSerializer
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spring.kafka.producer.value-serializer=org.springframework.kafka.support.serializer.JsonSerializer
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spring.kafka.consumer.properties.spring.json.trusted.packages=sample.kafka
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@ -15,13 +15,20 @@
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*/
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package sample.kafka;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.TimeUnit;
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import org.junit.Rule;
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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.test.context.TestConfiguration;
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import org.springframework.boot.test.rule.OutputCapture;
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import org.springframework.kafka.test.rule.KafkaEmbedded;
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import org.springframework.context.annotation.Bean;
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import org.springframework.kafka.test.context.EmbeddedKafka;
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import org.springframework.test.context.TestPropertySource;
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import org.springframework.test.context.junit4.SpringRunner;
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import static org.assertj.core.api.Assertions.assertThat;
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@ -30,32 +37,41 @@ import static org.assertj.core.api.Assertions.assertThat;
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* Integration tests for demo application.
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*
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* @author hcxin
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* @author Gary Russell
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* @author Stephane Nicoll
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*/
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@RunWith(SpringRunner.class)
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@SpringBootTest
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@TestPropertySource(properties = "spring.kafka.bootstrap-servers=${spring.embedded.kafka.brokers}")
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@EmbeddedKafka
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public class SampleKafkaApplicationTests {
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private static final CountDownLatch latch = new CountDownLatch(1);
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@Rule
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public OutputCapture outputCapture = new OutputCapture();
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@Autowired
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private Producer producer;
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@Test
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public void sendSimpleMessage() throws Exception {
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initKafkaEmbedded();
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SampleMessage message = new SampleMessage(1, "Test message");
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producer.send(message);
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Thread.sleep(1000L);
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assertThat(this.outputCapture.toString().contains("Test message")).isTrue();
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public void testVanillaExchange() throws Exception {
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assertThat(latch.await(10, TimeUnit.SECONDS)).isTrue();
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assertThat(this.outputCapture.toString().contains("A simple test message"))
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.isTrue();
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}
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public void initKafkaEmbedded() throws Exception {
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KafkaEmbedded embeddedKafka = new KafkaEmbedded(1, true);
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embeddedKafka.setKafkaPorts(9092);
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embeddedKafka.afterPropertiesSet();
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//Need 10s, waiting for the Kafka server start.
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Thread.sleep(10000L);
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@TestConfiguration
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public static class Config {
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@Bean
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public Consumer consumer() {
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return new Consumer() {
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@Override
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public void processMessage(SampleMessage message) {
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super.processMessage(message);
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latch.countDown();
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}
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};
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}
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}
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}
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