本文主要是介绍redis锁,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
1.锁代码
private boolean first(String key) {
return redisUtils.setIfAbsent(key, "syn", 30, TimeUnit.SECONDS);
}
private Object syn(String synKey, RedisSynHandle handle) {
boolean first = false;
try {
first = first(synKey);
if (first) {
return handle.handle();
} else {
throw new StandardException("请求频繁");
}
} finally {
if (first) {
finalEnd(synKey);
}
}
}
private void finalEnd(String key) {
if (StringUtils.isNotBlank(key)) {
redisUtils.del(key);
}
}
public interface RedisSynHandle {
//业务处理
Object handle();
}
/**
* 保存 若key已存在返回false,反之返回true
*/
public boolean setIfAbsent(String key, String value) {
logger.debug("Redis setIfAbsent key:{},value:{}", key, value);
Boolean result = redisTemplate.opsForValue().setIfAbsent(key, value);
return result != null && result;
}
/**
* 保存 若key已存在返回false,反之返回true 同时设置有效时间
*/
public boolean setIfAbsent(String key, String value, long time, TimeUnit timeUnit) {
logger.debug("Redis setIfAbsent key:{},value:{},time:{},timeUnit:{}", key, value, time, timeUnit);
try {
return setIfAbsent(key, value);
}finally {
redisTemplate.boundValueOps(key).expire(time, timeUnit);
}
}
2.使用
@Override
@Transactional(rollbackFor = Throwable.class)
public Object refund(Xxx xxx) {
return syn("xxx:xxx:xxx:refund:" + xxx.getId,()-> {
});
}
这篇关于redis锁的文章就介绍到这儿,希望我们推荐的文章对大家有所帮助,也希望大家多多支持为之网!