Spring Data Redis Expire Key

问题:

I have a One Spring Hibernate Application. In my application, Recently i am implemented Spring data Redis.

spring-servlet.xml
<!-- redis connection factory -->
<bean id="jedisConnFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory" p:use-pool="true"/>

<!-- redis template definition -->
<bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate" 
    p:connection-factory-ref="jedisConnFactory"/>

And this redisTemplate use in my ServiceImpl class.

RedisServiceImpl

@Autowired
private RedisTemplate<String, T> redisTemplate;

public RedisTemplate<String, T> getRedisTemplate() {
    return redisTemplate;
}

public void setRedisTemplate(RedisTemplate<String, T> redisTemplate) {
    this.redisTemplate = redisTemplate;
}

Now I added data in redisServer like this

public void putData(String uniqueKey, String key, Object results) {

    redisTemplate.opsForHash().put(uniqueKey, key, results);
}

Now i want to remove Expire key.

I search in Google, But in google all are saying like this

redisTemplate.expire(key, timeout, TimeUnit);

In this expire method, We need to provide uniqueKey instead of key. But I need to Expire key instead of uniqueKey.

So Please help me what can i do for expire Key?

回答1:

I am using Redis Version 3.2.100.

Instead of redis template ,Use Redis Cache Manager, pass redistemplate to cacheManager and use its set expires property to which is basically map of String & Long , you can add cache name and set its expiry time i.e time to live (TTL).

You can use setDefaultExpiration method of cacheManager to set same expiry time to all the cache.

@SuppressWarnings({ "rawtypes", "unused" })
@Configuration
@EnableCaching(proxyTargetClass = true, mode = AdviceMode.ASPECTJ, order = 1)
@PropertySource("classpath:/application.properties")
public class CacheConfigImpl extends CachingConfigurerSupport {

    private @Value("${redis.ip}") String redisHost;
    private @Value("${redis.port}") int redisPort;

     private static final Map<String, Long> cacheMap = new HashMap<String, Long>();
    static {
        cacheMap.put("method1cache", 600L);
        cacheMap.put("method2cache", 600L);
        cacheMap.put("method3cache", 800L);
    }

    @Bean
    public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {
        return new PropertySourcesPlaceholderConfigurer();
    }

    @Bean
    public JedisConnectionFactory redisConnectionFactory() {
        JedisConnectionFactory redisConnectionFactory = new JedisConnectionFactory();
        redisConnectionFactory.setHostName(CustomPropertyLoader.getProperty("redis.ip"));
        redisConnectionFactory.setPort(Integer.parseInt(CustomPropertyLoader.getProperty("redis.port")));
        return redisConnectionFactory;
    }

    @Bean
    public RedisTemplate<String, String> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate<String, String> redisTemplate = new RedisTemplate<String, String>();
        redisTemplate.setConnectionFactory(redisConnectionFactory);
        redisTemplate.afterPropertiesSet();
        return redisTemplate;
    }

    @Bean(name = "RCacheManager")
    public CacheManager cacheManager(RedisTemplate redisTemplate) {

        RedisCacheManager cacheManager = new RedisCacheManager(redisTemplate);
        cacheManager.setExpires(cacheMap);
        cacheManager.setUsePrefix(true);
        final String redis_client_name = CustomPropertyLoader.getProperty("redis.client.name");
        cacheManager.setCachePrefix(new RedisCachePrefix() {
            private final RedisSerializer<String> serializer = new StringRedisSerializer();
            private final String delimiter = ":";

            public byte[] prefix(String cacheName) {
                return this.serializer
                        .serialize(redis_client_name.concat(this.delimiter).concat(cacheName).concat(this.delimiter));
            }
        });
        return cacheManager;
    }
    }

回答2:

Actually you can do it with Redisson framework (Redis based Data Grid for Java) using RMapCache object. It provides ability to set ttl and maxIdle per map entry. Example:

// implements java.util.concurrent.ConcurrentMap interface
RMapCache<String, SomeObject> map = redisson.getMapCache("anyMap");

// ttl = 10 minutes, 
map.put("key1", new SomeObject(), 10, TimeUnit.MINUTES);
// ttl = 10 minutes, maxIdleTime = 10 seconds
map.put("key1", new SomeObject(), 10, TimeUnit.MINUTES, 10, TimeUnit.SECONDS);

回答3:

Actually You cannot expire or set the TTL for individual keys inside the Redis Hash. You can only expire or set TTL the complete hash. if you want to support this you have to change your data structure.

Here is the link for why it is not possible; and below are some excerpts from Redis expire

As far as i know redis cares for performance than features. It will defeat the purpose of memory efficient hash implementation in redis. Since hash key-value fields are not always represented as full featured redis object (they could be stored as linear array when hash is small to save memory), so the hash key field cannot have a TTL.

Also this link Allow to set an expiration on hash field might help you to change your data structure to handle expiry

回答4:

You can adopt Quartz for this purpose (implementing ttl for a Redis record). If you use Spring Boot, it autoconfigures Scheduler for you. Thus you can autowire it directly to your service layer.

@Autowired
private Scheduler scheduler;

Then you need to implement a job like this (in this example I am using Spring Redis Data):

@Slf4j
@Component
public class RemoveExpiredRecordJob implements Job {

@Autowired
public RedisRepository redisRepository;

@Override
public void execute(JobExecutionContext jobExecutionContext) {
    String key = jobExecutionContext
            .getJobDetail()
            .getKey()
            .getName();
    redisRepository.deleteById(key);
    log.info("Record removed due timeout :: {}", key);
}

}

Then you can encapsulate some logic for creating JobDetail and Trigger

@Component
public class SchedulerComponentBuilder {

    public JobDetail getJobDetail (String key, Class<? extends org.quartz.Job> clazz) {
        return JobBuilder.newJob().ofType(clazz)
                .storeDurably(false)
                .withIdentity(key)
                .withDescription("This key will be removed from Redis store when time expires.")
                .build();
    }

    public Trigger getTrigger(int ttl, JobDetail jobDetail) {
        java.util.Calendar calendar = java.util.Calendar.getInstance();
        calendar.add(java.util.Calendar.SECOND, ttl);
        return TriggerBuilder.newTrigger().forJob(jobDetail)
                .withDescription("This trigger fires once to remove an expired record from Redis store.")
                .startAt(calendar.getTime())
                .build();
    }
}

And finally, right after you saved you record in Redis repository, you need to schedule a job for removal this record (uniqueKey) from it like this:

@Autowired
private SchedulerComponentBuilder schedulerComponentBuilder;

private void schedule(String uniqueKey, int ttl) {
    try {
        JobDetail jobDetail = schedulerComponentBuilder.getJobDetail(uniqueKey, RemoveExpiredRecordJob.class);
        Trigger jobTrigger = schedulerComponentBuilder.getTrigger(ttl, jobDetail);
        scheduler.scheduleJob(jobDetail,jobTrigger);
        log.info("Job is scheduled :: {}", jobDetail);
    } catch (SchedulerException e) {
        log.error("Filed to schedule a job {}", e);
        throw new RuntimeException(e);
    }
}

回答5:

To set TTL for keys, you may create multiple beans of cacheManager and set TTL for individual bean. Then as per your use, you can use required cachemanager. Here is what I have implemented.

@Configuration("cacheConfig")
@EnableCaching
public class CacheConfig extends CachingConfigurerSupport{


    @Bean
    public JedisConnectionFactory redisConnectionFactory() {
        System.out.println("redisConnectionFactory");
        JedisConnectionFactory redisConnectionFactory = new JedisConnectionFactory();

        // Defaults
        redisConnectionFactory.setHostName("127.0.0.1");
        redisConnectionFactory.setPort(6379);
        return redisConnectionFactory;
    }

    @Bean
    public RedisTemplate<String, String> redisTemplate(RedisConnectionFactory cf) {
        System.out.println("redisTemplate");
        RedisTemplate<String, String> redisTemplate = new RedisTemplate<String, String>();
        redisTemplate.setConnectionFactory(cf);
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        return redisTemplate;
    }

    @Bean
    @Primary
    public CacheManager cacheManager2(RedisTemplate redisTemplate) {
        RedisCacheManager cacheManager = new RedisCacheManager(redisTemplate);
        // Number of seconds before expiration. Defaults to unlimited (0)
        cacheManager.setDefaultExpiration(20);
        cacheManager.setUsePrefix(true);
        return cacheManager;
    }


    @Bean
    public CacheManager cacheManager1(RedisTemplate redisTemplate) {
        RedisCacheManager cacheManager = new RedisCacheManager(redisTemplate);
        // Number of seconds before expiration. Defaults to unlimited (0)
        cacheManager.setDefaultExpiration(60);
        cacheManager.setUsePrefix(true);
        return cacheManager;
    }

}

To use above created cachemanager beans,

@Cacheable(value = "users", key = "#userId.toString()", cacheManager ="cacheManager2")
    @RequestMapping(value = "/{userId}", method = RequestMethod.GET)
    public User getUser(@PathVariable String userId) {
        LOG.info("Getting user with ID {}.: "+userId);
      return userService.fetchUserDataonUsers(userId);
    }


@Cacheable(value = "users", key = "#userId.toString()", cacheManager ="cacheManager1")
    @RequestMapping(value = "data/{userId}", method = RequestMethod.GET)
    public String getUserData(@PathVariable String userId) {
        LOG.info("Getting user with ID getUserData {}.: "+userId);
      return userService.fetchUserDataonUsers(userId).toString();
    }

when we define cacheManager ="cacheManager2" in @Cacheable , It will use TTL set for cacheManager2 defined in configuration. Same goes for cacheManager1