TransactionManager - Types

@Transactional commonly works with thread-bound transactions managed by PlatformTransactionManager, exposing a transaction to all data access operations within the current execution thread. Note: This does not propagate to newly started threads within the method.

A reactive transaction managed by ReactiveTransactionManager uses the Reactor context instead of thread-local attributes. As a consequence, all participating data access operations need to execute within the same Reactor context in the same reactive pipeline

TransactionManager - Code Examples

PlatformTransactionManager

PlatformTransactionManager - Configuration

@Configuration
@EnableTransactionManagement // <-------------------------------- (1)
public class MySpringConfig {
	@Bean
	public DataSource dataSource() {
	    return new MysqlDataSource(); // <----------------------- (2)
	}

	@Bean
	public PlatformTransactionManager transactionManager() {
	    return new DataSourceTransactionManager(dataSource()); // (3)
	}
}

1. @EnableTransactionManagement enables Spring’s annotation-driven transaction management capability (e.g. @Transactional)
2. create a database-specific or connection-pool specific DataSource here (MySQL is being used for this example)
3. create TransactionManager, which needs a DataSource to be able to manage transactions (for in-depth understanding see other PlatformTransactionManager implementations that Spring offers)

PlatformTransactionManager - Usage (Programmatically)

@Service
public class UserService {
 
    @Autowired
    private TransactionTemplate template;
 
    public Long registerUser(User user) {
        DefaultTransactionDefinition def = new DefaultTransactionDefinition();
		// explicitly setting the transaction name is something that can only be done programmatically
		def.setName("SomeTxName");
		def.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);

		TransactionStatus status = transactionManager.getTransaction(def);
		try {
			// execute your business logic here
		}
		catch (MyException ex) {
  			transactionManager.rollback(status);
  			throw ex;
		}
		transactionManager.commit(status);
    }
}

PlatformTransactionManager - Usage (Declaratively)

TODO

ReactiveTransactionManager

PlatformTransactionManager - Configuration

TODO

ReactiveTransactionManager - Usage (Programmatically)

TODO

ReactiveTransactionManager - Usage (Declaratively)

TODO

Resources

• https://docs.spring.io/spring-framework/docs/current/reference/html/data-access.html#transaction-programmatic-tm