Architecture Phase1 Week11:HomeWork

不可用得原因如未考虑故障隔离，未做高并发得异步处理，排队机制等。处理事务非对等。

要高可用则需要，解耦，隔离，异步，备份，Failover（失效转移），幂等，事务补偿，重试，熔断，限流



Boolean checkPW（String uid，String psw，String epsw）{

private Mac mac;

private static final String KEY_MAC = "PhyMAC";

try {

byte[] signature=epsw.getBytes();

SecretKey secretKey = new SecretKeySpec(uid.getBytes(ConstField.UTF8), KEY_MAC);

mac = Mac.getInstance(secretKey.getAlgorithm());

mac.init(secretKey);

byte[] result = mac.doFinal(psw.getBytes());

return Arrays.equals(signature, result);

} catch (Exception e) {

logger.error("create hmac helper failed.", e);

}

return false;

}