package Ġbe . sci ens ano . cor on alert . risk Ċ Ċ import Ġcom . google . android . gms . near by . ex posure notification . Exposure Window Ċ Ċ interface ĠR isk Levels Ġ{ ĊĊĠĠĠ Ġfun Ġcalculate Risk ( ĊĠĠĠĠĠĠĠ Ġapp Config : ĠEx posure Window Risk Calculation Config , ĊĠĠĠĠĠĠĠ Ġexposure Window : ĠEx posure Window ĊĠĠĠ Ġ): ĠR isk Result ? ĊĊĠĠĠ Ġfun Ġaggregate Results ( ĊĠĠĠĠĠĠĠ Ġapp Config : ĠEx posure Window Risk Calculation Config , ĊĠĠĠĠĠĠĠ Ġexposure Window Result Map : ĠMap < Exposure Window , ĠR isk Result > ĊĠĠĠ Ġ): ĠAg gregated Risk Result Ċ } Ċ