1.redis锁
import java.util.Collections; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; import lombok.extern.slf4j.Slf4j; import redis.clients.jedis.Jedis; @Slf4j @Component public class DistributionLock { private static final String LOCK_SUCCESS = "OK"; private static final String SET_IF_NOT_EXIST = "NX"; private static final String SET_WITH_EXPIRE_TIME = "PX"; private static final Long RELEASE_SUCCESS = 1L; @Autowired private CacheKit cacheKit; /** * 尝试获取分布式锁 * * @param jedis * Redis客户端 * @param lockKey * 锁 * @param requestId * 请求标识 * @param expireTime * 超期时间 * @return 是否获取成功 */ public boolean tryGetDistributedLock(String lockKey, String requestId, int expireTime) { Jedis jedis = cacheKit.getJedis(); String result = jedis.set(lockKey, requestId, SET_IF_NOT_EXIST, SET_WITH_EXPIRE_TIME, expireTime); cacheKit.returnResource(jedis); if (LOCK_SUCCESS.equals(result)) { return true; } return false; } /** * 释放分布式锁 * @param jedis Redis客户端 * @param lockKey 锁 * @param requestId 请求标识 * @return 是否释放成功 */ public boolean releaseDistributedLock(String lockKey, String requestId) { Jedis jedis = cacheKit.getJedis(); String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end"; Object result = jedis.eval(script, Collections.singletonList(lockKey), Collections.singletonList(requestId)); cacheKit.returnResource(jedis); if (RELEASE_SUCCESS.equals(result)) { return true; } return false; } }
注入
@Autowired private DistributionLock distributionLock;
//定时任务
boolean tryGetDistributedLock = distributionLock.tryGetDistributedLock(lockKey,requestId,31536000);
if(
tryGetDistributedLock
){
执行任务的代码
}