redis分布式锁的实现 原

package com.dongpeng.rule.base.utils;

import javax.annotation.Resource;

import org.apache.commons.lang3.StringUtils;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;

@Component
public class RedisLock {
	
	@Resource
	private RedisTemplate<String,String> redisTemplate;

	public boolean lock(String key) {
		long currentTime = System.currentTimeMillis();
		if (redisTemplate.opsForValue().setIfAbsent(key, String.valueOf(currentTime))) {
			return true;
		}

		String keyTime = redisTemplate.opsForValue().get(key);

		if (StringUtils.isEmpty(keyTime)) {
			if (redisTemplate.opsForValue().setIfAbsent(key, String.valueOf(currentTime))) {
				return true;
			}else {
				return false;			}
		}
        
		long keyCurrentTime = Long.parseLong(keyTime) + 3000;

		/**
		 * 判断是否死锁
		 */
		if (keyCurrentTime < currentTime) {
			redisTemplate.opsForValue().getOperations().delete(key);
			if (redisTemplate.opsForValue().setIfAbsent(key, String.valueOf(currentTime))) {
				return true;
			}
		}
		return false;
	}

	public void unlock(String key) {
		redisTemplate.opsForValue().getOperations().delete(key);
	}
}