Create only one session

1

Hi, i am created user spi provider for my monolithic project, and user spi is working fine, as client i am using postman for generating access token, but when you create multiply request is creating multiply access tokens, and multiply session i did not like it, my question is how can i create only one session?

Source code is here: GitHub - SmtxSoftDev/keycloak-core-user-spi

Or how can i do thomething like this?

@Override
    public boolean isValid(RealmModel realmModel, UserModel userModel, CredentialInput credentialInput) {
       // This is only example 
       if(keycloakSession.isHasSessions){
                 keycloakSession.removeAllSession();
        }
        // This is only example
        if(userData.isValid){
               createNewSession();
        }
        return true;  
    }