Method to prohibit multi-terminal login based on Redis unordered collection

Application Background

Assuming multiple application names are named A and B, users are prohibited from logging in from A and B at the same time. A login kicks B, and B login kicks A

Implementation idea

Set two unordered sets a_set, b_set

a b When logging in, execute

$redis->sAdd('a_set',$user_id);//A登录
$redis->sRem('b_set',$user_id);//踢B

$redis->sAdd('b_set',$user_id);//B登录
$redis->sRem('a_set',$user_id);//踢A

Before api obtains data, determine whether the id of the end is online (AB two The APIs of each end are separate)

A judgment:

if($redis->sIsmember('a_set',$user_id)){
   //true 
}else{
    //false
}

B judgment

if($redis->sIsmember('b_set',$user_id)){
    //true
}else{
    //false
}

Method used:

sadd key_set value 设置值到set中
sismember key_set value 判断值时候存在key_set里面
srem key_set value 移除指定值
smembers key_set 获取所有的value

For more redis knowledge, please pay attention to the redis introductory tutorial column.

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