The Power of NoSQL: How Cassandra and Spring Boot Deliver Scalable Solutions

 

Apache Cassandra is a highly scalable and distributed NoSQL database management system designed to handle large amounts of data across many commodity servers. It was developed at Facebook and later became an Apache Software Foundation project.

In previous post we discussed about how Cassandra can help in application scaling using gossip protocol, Please follow the link to find out more Link:

Why is Apache Cassandra well-suited for use with Spring Boot?

Apache Cassandra and Spring Boot complement each other well, offering several benefits for developers. The combination of Cassandra’s scalability as a NoSQL database and Spring Boot’s simplified configuration and improved developer productivity makes it easier to build high-performance and scalable applications. Additionally, the integration of Cassandra with other Spring projects and the ease of testing with Spring Boot enhances the overall development experience.

How to configure Apache Cassandra on Spring Boot?

To connect a Spring Boot application to multiple Apache Cassandra clusters, you can follow these steps:

1. Add the Cassandra driver to your application’s classpath. You can do this by adding the following dependency to your pom.xml file (for Maven projects) or by adding the Cassandra driver jar file to your project’s classpath:

<dependency>
    <groupId>com.datastax.oss</groupId>
    <artifactId>java-driver-core</artifactId>
    <version>4.9.0</version>
</dependency>

2. Configure the Cassandra connection details for each cluster in your Spring Boot application.properties or application.yml file:

spring.data.cassandra.cluster1.keyspace-name=<your_keyspace_name>
spring.data.cassandra.cluster1.contact-points=<host1>,<host2>,<host3>
spring.data.cassandra.cluster1.port=9042

spring.data.cassandra.cluster2.keyspace-name=<your_keyspace_name>
spring.data.cassandra.cluster2.contact-points=<host4>,<host5>,<host6>
spring.data.cassandra.cluster2.port=9042

3. Create a Cassandra configuration class for each cluster by extending AbstractCassandraConfiguration and providing the Cassandra entity classes and keyspace name.

@Configuration
@EnableCassandraRepositories(basePackages = "com.example.repository.cluster1",
        cassandraTemplateRef = "cassandraTemplateCluster1")
public class CassandraConfigCluster1 extends AbstractCassandraConfiguration {

    @Override
    protected String getKeyspaceName() {
        return "<your_keyspace_name>";
    }

    @Override
    public SchemaAction getSchemaAction() {
        return SchemaAction.CREATE_IF_NOT_EXISTS;
    }

    @Override
    public String[] getEntityBasePackages() {
        return new String[]{"<your_package>.model.cluster1"};
    }
}

@Configuration
@EnableCassandraRepositories(basePackages = "com.example.repository.cluster2",
        cassandraTemplateRef = "cassandraTemplateCluster2")
public class CassandraConfigCluster2 extends AbstractCassandraConfiguration {

    @Override
    protected String getKeyspaceName() {
        return "<your_keyspace_name>";
    }

    @Override
    public SchemaAction getSchemaAction() {
        return SchemaAction.CREATE_IF_NOT_EXISTS;
    }

    @Override
    public String[] getEntityBasePackages() {
        return new String[]{"<your_package>.model.cluster2"};
    }
}

4. Create a CassandraTemplate bean for each cluster

@Bean
@Primary
public CassandraTemplate cassandraTemplateCluster1(Session sessionCluster1) {
    return new CassandraTemplate(sessionCluster1);
}

@Bean
public CassandraTemplate cassandraTemplateCluster2(Session sessionCluster2) {
    return new CassandraTemplate(session

5. Create Cassandra entities that represent your data model. For example:

@Table("employee")
public class Employee {

    @PrimaryKey
    private int id;

    private String name;
    private int age;

    // getters and setters ...
}

6. Inject the repository into your Spring Boot service and use it to perform CRUD operations on Cassandra. For example:

@Service
public class EmployeeService {

    @Autowired
    private EmployeeRepository employeeRepository;

    public Employee save(Employee employee) {
        return employeeRepository.save(employee);
    }

    public List<Employee> findAll() {
        return employeeRepository.findAll();
    }

    // ...
}

Summary

Apache Cassandra is a highly scalable NoSQL database, and Spring Boot is a popular Java framework for building microservices and web applications. The combination of Cassandra and Spring Boot provides several advantages for developers, including simplified configuration, improved developer productivity, easy data access, improved scalability, integration with other Spring projects, and easy testing. To use Cassandra with Spring Boot, developers need to add Cassandra dependencies to their project and configure a Cassandra connection in the Spring Boot application.