How To Configure TTL in Spring Data Redis

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In Spring Data Redis, you can configure the Time-to-Live (TTL) for Redis keys using various approaches, depending on your specific requirements and use cases. TTL is the amount of time a key will exist in Redis before it expires and is automatically removed. Here are some ways to configure TTL in Spring Data Redis:

1. Using `@RedisHash` and `@TimeToLive` annotation:

   You can use the `@TimeToLive` annotation to specify the TTL for entities stored in Redis. This annotation should be placed on a field or getter method in your entity class. The value you set in `@TimeToLive` represents the TTL in seconds.

   @RedisHash("myEntity")

   public class MyEntity {

       @Id

       private String id;

       

       // Set the TTL to 3600 seconds (1 hour)

       @TimeToLive

       private Long expiration;

       

       // Other fields and methods

   }

   With this configuration, when you save an instance of `MyEntity` using Spring Data Redis, it will automatically set the expiration time for the key based on the `expiration` field.

2. Using RedisTemplate:

   You can set the TTL for a specific Redis key using the `RedisTemplate` by explicitly specifying the expiration time. Here's an example:

   import org.springframework.data.redis.core.RedisTemplate;

   import org.springframework.stereotype.Service;

   

   @Service

   public class MyService {

       private final RedisTemplate<String, String> redisTemplate;

       

       public MyService(RedisTemplate<String, String> redisTemplate) {

           this.redisTemplate = redisTemplate;

       }

       

       public void setWithTTL(String key, String value, long ttlInSeconds) {

           redisTemplate.opsForValue().set(key, value);

           redisTemplate.expire(key, ttlInSeconds, TimeUnit.SECONDS);

       }

   }

   In this example, the `setWithTTL` method sets a key-value pair in Redis and then sets the TTL for that key using `expire` method.

3. Configuring the default TTL:

   You can configure a default TTL for all keys using the RedisConnectionFactory. Here's an example in Spring Boot's `application.properties`:

   spring.redis.time-to-live=3600 # TTL in seconds (1 hour)

   This sets a default TTL for all keys saved to Redis using Spring Data Redis.

Remember to choose the approach that best fits your application's requirements. You can set different TTLs for different keys or use a default TTL for all keys, depending on your use case.

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How To Configure TTL in Spring Data Redis

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