Verificar se o usuário tá logado (CakePHP 2.x)

Pessoal, boa noite.

Como eu faço a verificação abaixo no CakePHP 2.x???

if(is_null($session->read('Auth.Usuario.username'))){  	//Usuário não logado  }else{  	//Usuário logado  }

Grato desde já,

Anderson

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