backend/src/main/java/nju/seec/helper/util/cache/RedisCacheUtils.java

package nju.seec.helper.util.cache;

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

import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

/**
 * use redis
 *
 * @author cst
 */
@Component
public class RedisCacheUtils {
    private final RedisTemplate<String, String> redisTemplate;

    public RedisCacheUtils(RedisTemplate<String, String> redisTemplate) {
        this.redisTemplate = redisTemplate;
    }

    public void set(String cacheName, String key, String value, long expireTime, TimeUnit timeUnit) {
        redisTemplate.opsForValue().set(combineKey(cacheName, key), value, expireTime, timeUnit);
    }

    public String get(String cacheName, String key) {
        return redisTemplate.opsForValue().get(combineKey(cacheName, key));
    }

    public List<String> multiGet(String cacheName, List<String> keys) {
        List<String> body = keys.stream().map(key -> combineKey(cacheName, key)).collect(Collectors.toList());
        return redisTemplate.opsForValue().multiGet(body);
    }

    public void remove(String cacheName, String key) {
        redisTemplate.delete(cacheName + ":" + key);
    }

    private String combineKey(String cacheName, String key) {
        return cacheName + ":" + key;
    }
}