BAEL-4467: Introduction to Debezium

libraries-data-db/src/test/java/com/baeldung/libraries/debezium/DebeziumCDCLiveTest.java

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+package com.baeldung.libraries.debezium;
+
+import com.baeldung.libraries.debezium.repository.CustomerRepository;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.context.DynamicPropertyRegistry;
+import org.springframework.test.context.DynamicPropertySource;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = DebeziumCDCApplication.class)
+@ActiveProfiles("test")
+public class DebeziumCDCLiveTest {
+
+    @Autowired
+    private CustomerRepository customerRepository;
+
+    @Autowired
+    @Qualifier("sourceJdbcTemplate")
+    private NamedParameterJdbcTemplate jdbcTemplate;
+
+    @Before
+    public void clearData() {
+        jdbcTemplate.update("delete from customer where id = :id", Collections.singletonMap("id", 1));
+    }
+
+    @DynamicPropertySource
+    static void registerProperties(DynamicPropertyRegistry registry) {
+        registry.add("customer.datasource.port", MySQLTestContainerConfiguration::getPort);
+    }
+
+    @Test
+    public void whenInsertDataToSourceDatabase_thenCdcOk() throws InterruptedException {
+        assertThat(customerRepository.findAll().size()).isZero();
+
+        // insert data to source DB
+        Map<String, Object> map = new HashMap<>();
+        map.put("id", 1);
+        map.put("fullname", "John Doe");
+        map.put("email", "test@test.com");
+
+        jdbcTemplate.update("INSERT INTO customer(id, fullname, email) VALUES (:id, :fullname, :email)", map);
+
+        // verify target DB
+        Thread.sleep(10000);
+        assertThat(customerRepository.findAll().size()).isNotZero();
+    }
+
+}

libraries-data-db/src/test/java/com/baeldung/libraries/debezium/MySQLTestContainerConfiguration.java

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+package com.baeldung.libraries.debezium;
+
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
+import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
+import org.springframework.jdbc.datasource.DriverManagerDataSource;
+import org.springframework.jdbc.datasource.embedded.EmbeddedDatabase;
+import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder;
+import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType;
+import org.testcontainers.containers.MySQLContainer;
+import org.testcontainers.utility.DockerImageName;
+
+import javax.sql.DataSource;
+
+@Configuration
+public class MySQLTestContainerConfiguration {
+
+    public static final DockerImageName MYSQL_IMAGE = DockerImageName.parse("mysql:8.0");
+
+    private static final MySQLContainer<?> mysqlContainer = new MySQLContainer<>(MYSQL_IMAGE)
+        .withCommand("--default-authentication-plugin=mysql_native_password")
+        .withInitScript("debezium/customer.sql")
+        .withDatabaseName("SOURCE_DB")
+        .withUsername("user")
+        .withPassword("user")
+        .withEnv("MYSQL_ROOT_PASSWORD", "user");
+
+    MySQLTestContainerConfiguration() {
+        mysqlContainer.start();
+    }
+
+    public static int getPort() {
+        return mysqlContainer.getFirstMappedPort();
+    }
+
+    @Bean
+    @Primary
+    public EmbeddedDatabase targetDatasource() {
+        return new EmbeddedDatabaseBuilder()
+                 .setType(EmbeddedDatabaseType.H2)
+                 .setName("TAGRET_DB")
+                 .build();
+    }
+
+    @Bean(name = "SOURCE_DS")
+    public DataSource sourceDataSource() {
+        DriverManagerDataSource dataSource = new DriverManagerDataSource();
+        dataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");
+        dataSource.setUrl(mysqlContainer.getJdbcUrl());
+        dataSource.setUsername(mysqlContainer.getUsername());
+        dataSource.setPassword(mysqlContainer.getPassword());
+        return dataSource;
+    }
+
+    @Bean(name = "sourceJdbcTemplate")
+    public NamedParameterJdbcTemplate getJdbcTemplate(@Qualifier("SOURCE_DS") DataSource sourceDataSource) {
+        return new NamedParameterJdbcTemplate(sourceDataSource);
+    }
+}

libraries-data-db/src/test/resources/application-test.yml

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+## Source Database Properties
+customer:
+  datasource:
+    host: localhost
+    database: SOURCE_DB
+    username: root
+    password: user

libraries-data-db/src/test/resources/debezium/customer.sql

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+drop table if exists customer;
+
+CREATE TABLE customer
+(
+    id integer NOT NULL,
+    fullname character varying(255),
+    email character varying(255),
+    CONSTRAINT customer_pkey PRIMARY KEY (id)
+);