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Merge pull request #10876 from hkhan/BAEL-4845-create-topic-in-kafka 

[BAEL-4845] Create Kafka topics
This commit is contained in:
davidmartinezbarua 2021-06-13 21:33:38 -03:00 committed by GitHub
parent f0d9004fdd 22dbfe7fdb
commit b028f4c837
3 changed files with 134 additions and 2 deletions
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9
libraries-data-3/pom.xml
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@ -17,8 +17,6 @@
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>${kafka.version}</version>
<classifier>test</classifier>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.kafka</groupId>
@ -47,6 +45,12 @@
<version>${testcontainers-kafka.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.testcontainers</groupId>
<artifactId>junit-jupiter</artifactId>
<version>${testcontainers-jupiter.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<properties>
@ -54,6 +58,7 @@
<slf4j.version>1.7.25</slf4j.version>
<kafka.version>2.8.0</kafka.version>
<testcontainers-kafka.version>1.15.3</testcontainers-kafka.version>
<testcontainers-jupiter.version>1.15.3</testcontainers-jupiter.version>
</properties>
</project>

87
libraries-data-3/src/main/java/com/baeldung/kafka/admin/KafkaTopicApplication.java Normal file
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@ -0,0 +1,87 @@
package com.baeldung.kafka.admin;
import org.apache.kafka.clients.admin.Admin;
import org.apache.kafka.clients.admin.AdminClientConfig;
import org.apache.kafka.clients.admin.CreateTopicsOptions;
import org.apache.kafka.clients.admin.CreateTopicsResult;
import org.apache.kafka.clients.admin.NewTopic;
import org.apache.kafka.common.KafkaFuture;
import org.apache.kafka.common.config.TopicConfig;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
public class KafkaTopicApplication {
private final Properties properties;
public KafkaTopicApplication(Properties properties) {
this.properties = properties;
}
public void createTopic(String topicName) throws Exception {
try (Admin admin = Admin.create(properties)) {
int partitions = 1;
short replicationFactor = 1;
NewTopic newTopic = new NewTopic(topicName, partitions, replicationFactor);
CreateTopicsResult result = admin.createTopics(
Collections.singleton(newTopic));
// get the async result for the new topic creation
KafkaFuture<Void> future = result.values().get(topicName);
// call get() to block until topic creation has completed or failed
future.get();
}
}
public void createTopicWithOptions(String topicName) throws Exception {
Properties props = new Properties();
props.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
try (Admin admin = Admin.create(props)) {
int partitions = 1;
short replicationFactor = 1;
NewTopic newTopic = new NewTopic(topicName, partitions, replicationFactor);
CreateTopicsOptions topicOptions = new CreateTopicsOptions()
.validateOnly(true)
.retryOnQuotaViolation(true);
CreateTopicsResult result = admin.createTopics(
Collections.singleton(newTopic), topicOptions
);
KafkaFuture<Void> future = result.values().get(topicName);
future.get();
}
}
public void createCompactedTopicWithCompression(String topicName) throws Exception {
Properties props = new Properties();
props.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
try (Admin admin = Admin.create(props)) {
int partitions = 1;
short replicationFactor = 1;
// Create a compacted topic with 'lz4' compression codec
Map<String, String> newTopicConfig = new HashMap<>();
newTopicConfig.put(TopicConfig.CLEANUP_POLICY_CONFIG, TopicConfig.CLEANUP_POLICY_COMPACT);
newTopicConfig.put(TopicConfig.COMPRESSION_TYPE_CONFIG, "lz4");
NewTopic newTopic = new NewTopic(topicName, partitions, replicationFactor)
.configs(newTopicConfig);
CreateTopicsResult result = admin.createTopics(
Collections.singleton(newTopic)
);
KafkaFuture<Void> future = result.values().get(topicName);
future.get();
}
}
}

40
libraries-data-3/src/test/java/com/baeldung/kafka/admin/KafkaTopicApplicationIntegrationTest.java Normal file
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@ -0,0 +1,40 @@
package com.baeldung.kafka.admin;
import org.apache.kafka.clients.admin.AdminClientConfig;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.testcontainers.containers.KafkaContainer;
import org.testcontainers.junit.jupiter.Container;
import org.testcontainers.junit.jupiter.Testcontainers;
import org.testcontainers.utility.DockerImageName;
import java.util.Properties;
import static org.assertj.core.api.Assertions.assertThat;
@Testcontainers
class KafkaTopicApplicationIntegrationTest {
@Container
private static final KafkaContainer KAFKA_CONTAINER = new KafkaContainer(DockerImageName.parse("confluentinc/cp-kafka:5.4.3"));
private KafkaTopicApplication kafkaTopicApplication;
@BeforeEach
void setup() {
Properties properties = new Properties();
properties.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, KAFKA_CONTAINER.getBootstrapServers());
kafkaTopicApplication = new KafkaTopicApplication(properties);
}
@Test
void givenTopicName_whenCreateNewTopic_thenTopicIsCreated() throws Exception {
kafkaTopicApplication.createTopic("test-topic");
String topicCommand = "/usr/bin/kafka-topics --bootstrap-server=localhost:9092 --list";
String stdout = KAFKA_CONTAINER.execInContainer("/bin/sh", "-c", topicCommand)
.getStdout();
assertThat(stdout).contains("test-topic");
}
}