基于redis setIfAbsent的使用说明

redis> SETNX mykey "Hello"
(integer) 1
redis> SETNX mykey "World"
(integer) 0
redis> GET mykey
"Hello"

BoundValueOperations boundValueOperations = this.redisTemplate.boundValueOps(redisKey);
flag = boundValueOperations.setIfAbsent(value); // flag 表示的是否set
boundValueOperations.expire(seconds, TimeUnit.SECONDS);
if(!flag){ // 重复
  repeatSerial.add(serialNo);
  continue;
}else{// 没有重复
  norepeatSerial.add(serialNo);
}

boolean store = stringRedisTemplate.opsForValue().setIfAbsent(key,value);
if(store){
 stringRedisTemplate.expire(key,timeout); 
 // todo something... 
}

stringRedisTemplate.setEnableTransactionSupport(true);
stringRedisTemplate.multi();
boolean store = stringRedisTemplate.opsForValue().setIfAbsent(key,value);
if(store){
 stringRedisTemplate.expire(key,timeout);  
}
stringRedisTemplate.exec();
if(store){
  // todo something...
}

stringRedisTemplate.setEnableTransactionSupport(true);
stringRedisTemplate.multi();
String result = stringRedisTemplate.opsForValue().get(key);
if(StringUtils.isNotBlank(result)){
  return false;
}
// 锁的过期时间为1小时
stringRedisTemplate.opsForValue().set(key, value,timeout);
stringRedisTemplate.exec();
// todo something...

stringRedisTemplate.setEnableTransactionSupport(true);
stringRedisTemplate.multi();
stringRedisTemplate.opsForValue().setIfAbsent(lockKey,JSON.toJSONString(event));
stringRedisTemplate.expire(lockKey,Constants.REDIS_KEY_EXPIRE_SECOND_1_HOUR, TimeUnit.SECONDS);
List result = stringRedisTemplate.exec(); // 这里result会返回事务内每一个操作的结果，如果setIfAbsent操作失败后，result[0]会为false。
if(true == result[0]){
 // todo something...
}

private Boolean setLock(RecordEventModel event) {
    String lockKey = event.getModel() + ":" + event.getAction() + ":" + event.getId() + ":" + event.getMessage_id();
    log.info("lockKey : {}" , lockKey);
    SessionCallback<Boolean> sessionCallback = new SessionCallback<Boolean>() {
      List<Object> exec = null;
      @Override
      @SuppressWarnings("unchecked")
      public Boolean execute(RedisOperations operations) throws DataAccessException {
        operations.multi();
        stringRedisTemplate.opsForValue().setIfAbsent(lockKey,JSON.toJSONString(event));
        stringRedisTemplate.expire(lockKey,Constants.REDIS_KEY_EXPIRE_SECOND_1_HOUR, TimeUnit.SECONDS);
        exec = operations.exec();
        if(exec.size() > 0) {
          return (Boolean) exec.get(0);
        }
        return false;
      }
    };
    return stringRedisTemplate.execute(sessionCallback);
  }