Feature Request: PlatformTransactionManager for Redis-only Applications

Description

Currently, Spring Data Redis allows RedisTemplate to participate in transactions by enabling setEnableTransactionSupport(true). However, declarative transaction management (@Transactional) requires a PlatformTransactionManager. The current documentation assumes that applications already have a JDBC DataSourceTransactionManager or similar, which makes Redis transactions only usable in applications that also use a database.

For applications that use Redis exclusively, there is no out-of-the-box PlatformTransactionManager implementation. This limits the ability to use @Transactional or TransactionTemplate with Redis in a consistent Spring transaction management style.

Proposed Solution

Provide a new implementation of PlatformTransactionManager specifically for Redis-only applications. Key features could include:

• Integration with RedisTemplate and its transaction support (MULTI/EXEC/DISCARD).
• Thread-bound connection management, similar to current transactional support when setEnableTransactionSupport(true) is enabled.
• Support for rollback semantics if an exception occurs within a @Transactional method.
• Minimal or no dependencies on a JDBC DataSource.

Example Usage

@Configuration
@EnableTransactionManagement
public class RedisTxOnlyConfiguration {

    @Bean
    public StringRedisTemplate redisTemplate() {
        StringRedisTemplate template = new StringRedisTemplate(redisConnectionFactory());
        template.setEnableTransactionSupport(true);
        return template;
    }

    @Bean
    public RedisConnectionFactory redisConnectionFactory() {
        // Lettuce or Jedis
    }

    @Bean
    public PlatformTransactionManager transactionManager() {
        return new RedisTransactionManager(redisTemplate());
    }
}

This would allow fully declarative @Transactional support for Redis-only applications, making transaction management consistent across Spring components.

Benefits

• Unified transaction management for Redis-only applications.
• Reduces the need for workaround solutions using programmatic transaction handling.
• Aligns Redis support with Spring’s existing transaction model.

Additional Context

Related documentation: [Spring Data Redis – Transaction Support](https://docs.spring.io/spring-data/redis/docs/current/reference/html/#redis:transactions)

Start with the Spring Data Redis transaction-support documentation and the existing RedisTemplate behavior when setEnableTransactionSupport(true) is enabled. Define the transaction manager's scope, connection binding, MULTI/EXEC/DISCARD handling, and rollback behavior for @Transactional and TransactionTemplate use in Redis-only applications.