Over-Engineering Spring Boot Redis component? I just need to get a value from a particular key.

[Hans Hovan]

I have a Spring Boot application and I am adding a Redis component to it. I'm fairly new to Spring Boot and very new to Redis. What I need to do is get a JSON String from a Redis server and then the application will do some manipulations/handle that String. Basically I just need the Read of a CRUD setup. A different application manages the contents of the Key/Value, this application just needs to make sure it is using the most updated Value from time to time before it does stuff.

All of the tutorials I'm finding suggest to make a Redis Configuration and Repository. Something like this:

@Configuration
public class RedisConfig {

    @Bean
    JedisConnectionFactory jedisConnectionFactory() {
        RedisStandaloneConfiguration redisStandaloneConfiguration = new RedisStandaloneConfiguration("someIp", port);
        redisStandaloneConfiguration.setPassword(RedisPassword.of("myPassword"));
        return new JedisConnectionFactory(redisStandaloneConfiguration);
    }

    @Bean
    public RedisTemplate<String, Object> redisTemplate() {
        final RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
        template.setConnectionFactory(jedisConnectionFactory());
        return template;
    }
}

@Repository
public class RouteRepository {

    private static final String KEY = "myKey";

    private RedisTemplate<String, Object> redisTemplate;
    private HashOperations<String, Long, String> hashOperations;

    @Autowired
    public RouteRepository(RedisTemplate<String, Object> redisTemplate){
        this.redisTemplate = redisTemplate;
    }

    @PostConstruct
    private void init() {
        hashOperations = redisTemplate.opsForHash();
    }

    //***Some way to to get the value of a particular key?***
}

The tutorials I've been looking at (like this one: https://grokonez.com/spring-framework/spring-data/spring-data-redis-example-spring-boot-redis-example) suggest that to get the value of a particular key you'd do something like this:

  @Override
  public Customer find(Long id) {
    return hashOperations.get(KEY, id);
  }

But I don't have a DataModel I'm directly trying to turn my find call into. I just want a String value associated with a particular Key. So, I'm thinking that I need to change

<String, Object>

in the Configuration and Repository to

<String, String>

because I'm using a String to get a String?

I'm also not really using hash functionality like in the examples where there are different ids as part of the Key. I just need a way to get/find a Key's value, something more like a JedisPool? Along the pseudo-code of:

 
  public String find() {
    return jedis.get(KEY);
  }

But I'm not sure how to set that up within what I'm already working with. Or maybe my overall approach is way off? Appreciate any help! Thanks.

[Hans Hovan]

I figured out my need:

Used

RedisTemplate<String, String> redisTemplate

and then

redisTemplate.opsForValue().get("KEY")

to get the String value I was looking for.